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R
LCD TV
SERVICE MANUAL
CAUTIONBEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA73E
MODEL : 32LC7D(C) 32LC7D(C)-UB
website:http://biz.LGservice.com
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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................10
TROUBLE SHOOTING & BLOCK DIAGRAM ........................................16
EXPLODED VIEW .................................................................................. 42
SVC. SHEET ...............................................................................................
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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in theSchematic Diagram and Replacement Parts List.It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during theservicing of a receiver whose chassis is not isolated from the ACpower line. Use a transformer of adequate power rating as thisprotects the technician from accidents resulting in personal injuryfrom electrical shocks.
It will also protect the receiver and it's components from beingdamaged by accidental shorts of the circuitry that may beinadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposedmetallic parts of the cabinet, such as antennas, terminals, etc., tobe sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)With the instrument AC plug removed from AC source, connect anelectrical jumper across the two AC plug prongs. Place the ACswitch in the on position, connect one lead of ohm-meter to the ACplug prongs tied together and touch other ohm-meter lead in turn toeach exposed metallic parts such as antenna terminals, phone
jacks, etc.If the exposed metallic part has a return path to the chassis, themeasured resistance should be between 1M and 5.2M.When the exposed metal has no return path to the chassis thereading must be infinite.An other abnormality exists that must be corrected before thereceiver is returned to the customer.
Leakage Current Hot Check (See below Figure)Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitorbetween a known good earth ground (Water Pipe, Conduit, etc.)and the exposed metallic parts.Measure the AC voltage across the resistor using AC voltmeterwith 1000 ohms/volt or more sensitivity.Reverse plug the AC cord into the AC outlet and repeat AC voltagemeasurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to0.5mA.In case any measurement is out of the limits specified, there ispossibility of shock hazard and the set must be checked andrepaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To InstrumentsexposedMETALLIC PARTS
Good Earth Groundsuch as WATER PIPE,CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF
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CAUTION: Before servicing receivers covered by this servicemanual and its supplements and addenda, read and follow theSAFETY PRECAUTIONSon page 3 of this publication.NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions1. Always unplug the receiver AC power cord from the AC power
source before;a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.CAUTION: A wrong part substitution or incorrect polarityinstallation of electrolytic capacitors may result in anexplosion hazard.
2. Test high voltage only by measuring it with an appropriate highvoltage meter or other voltage measuring device (DVM,FETVOM, etc) equipped with a suitable high voltage probe.Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of itsassemblies.
4. Unless specified otherwise in this service manual, cleanelectrical contacts only by applying the following mixture to thecontacts with a pipe cleaner, cotton-tipped stick or comparablenon-abrasive applicator; 10% (by volume) Acetone and 90% (byvolume) isopropyl alcohol (90%-99% strength)CAUTION: This is a flammable mixture.Unless specified otherwise in this service manual, lubrication ofcontacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.6. Do not apply AC power to this instrument and/or any of itselectrical assemblies unless all solid-state device heat sinks arecorrectly installed.
7. Always connect the test receiver ground lead to the receiverchassis ground before connecting the test receiver positivelead.Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in thisservice manual.
CAUTION: Do not connect the test fixture ground strap to anyheat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are calledElectrostatically Sensitive (ES) Devices. Examples of typical ESdevices are integrated circuits and some field-effect transistors andsemiconductor "chip" components. The following techniquesshould be used to help reduce the incidence of componentdamage caused by static by static electricity.1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostaticcharge on your body by touching a known earth ground.Alternatively, obtain and wear a commercially availabledischarging wrist strap device, which should be removed toprevent potential shock reasons prior to applying power to the
unit under test.2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such asaluminum foil, to prevent electrostatic charge buildup orexposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESdevices.
4. Use only an anti-static type solder removal device. Some solderremoval devices not classified as "anti-static" can generateelectrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generateelectrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protectivepackage until immediately before you are ready to install it.(Most replacement ES devices are packaged with leadselectrically shorted together by conductive foam, aluminum foilor comparable conductive material).
7. Immediately before removing the protective material from theleads of a replacement ES device, touch the protective materialto the chassis or circuit assembly into which the device will beinstalled.
CAUTION:Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such asthe brushing together of your clothes fabric or the lifting of yourfoot from a carpeted floor can generate static electricitysufficient to damage an ES device.)
General Soldering Guidelines1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within therange or 500F to 600F.
2. Use an appropriate gauge of RMA resin-core solder composedof 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-bristle (0.5 inch, or 1.25cm) brush with a metal handle.Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering techniquea. Allow the soldering iron tip to reach normal temperature.
(500F to 600F)b. Heat the component lead until the solder melts.c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.CAUTION: Work quickly to avoid overheating the circuitboard printed foil.
6. Use the following soldering technique.a. Allow the soldering iron tip to reach a normal temperature
(500F to 600F)b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it thereonly until the solder f lows onto and around both thecomponent lead and the foil.CAUTION: Work quickly to avoid overheating the circuitboard printed foil.
d. Closely inspect the solder area and remove any excess orsplashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS
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IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) throughwhich the IC leads are inserted and then bent flat against thecircuit foil. When holes are the slotted type, the following techniqueshould be used to remove and replace the IC. When working withboards using the familiar round hole, use the standard techniqueas outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gentlyprying up on the lead with the soldering iron tip as the soldermelts.
2. Draw away the melted solder with an anti-static suction-typesolder removal device (or with solder braid) before removing theIC.
Replacement
1. Carefully insert the replacement IC in the circuit board.2. Carefully bend each IC lead against the circuit foil pad and
solder it.3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close aspossible to the component body.
2. Bend into a "U" shape the end of each of three leads remainingon the circuit board.
3. Bend into a "U" shape the replacement transistor leads.4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" withlong nose pliers to insure metal to metal contact then soldereach connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuitboard.4. Insert new transistor in the circuit board.5. Solder each transistor lead, and clip off excess lead.6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close aspossible to diode body.
2. Bend the two remaining leads perpendicular y to the circuitboard.
3. Observing diode polarity, wrap each lead of the new diodearound the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and ifnecessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollowstake.
2. Securely crimp the leads of replacement component aroundnotch at stake top.
3. Solder the connections.CAUTION: Maintain original spacing between the replacedcomponent and adjacent components and the circuit board toprevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuitboard will weaken the adhesive that bonds the foil to the circuitboard causing the foil to separate from or "lift-off" the board. Thefollowing guidelines and procedures should be followed wheneverthis condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use thefollowing procedure to install a jumper wire on the copper patternside of the circuit board. (Use this technique only on ICconnections).
1. Carefully remove the damaged copper pattern with a sharpknife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (ifused) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire andcarefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copperpattern and let it overlap the previously scraped end of the goodcopper pattern. Solder the overlapped area and clip off anyexcess jumper wire.
At Other Connections
Use the following technique to repair the defective copper patternat connections other than IC Pins. This technique involves theinstallation of a jumper wire on the component side of the circuitboard.
1. Remove the defective copper pattern with a sharp knife.Remove at least 1/4 inch of copper, to ensure that a hazardouscondition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the patternbreak and locate the nearest component that is directlyconnected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the leadof the nearest component on the other side.Carefully crimp and solder the connections.CAUTION: Be sure the insulated jumper wire is dressed so theit does not touch components or sharp edges.
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SPECIFICATIONNOTE : Specifications and others are subject to change without notice for improvement .
4. General Specification(TV)
No. Item Specification Remark1. Receiving System ATSC/64 & 256 QAM/ NTSC-M
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3. Input Voltage 1) AC 100 ~ 240V 50/60Hz
4. Market NORTH AMERICA
5. Screen Size 26 inch Wide 26 inches(582.96mm) For 26LC7D-UB
32 inch Wide - 31.51inches(800.4mm) For 32LC7D-UB,32LC4D-UA
37 inch Wide 32.02 inches(940.3mm) For 37LC7D-UB42 inch Wide 42.02 inches(1067.308mm) For 42LC7D-UB,42LC4D-UA
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module T260XW02-V5 For 26LC7D-UE
LC320WX4-SLA1 For 32LC7D-UB,32LC4D-UA
LC370WX3-SLA1 For 37LC7D-UB
LC420WX6-SLA1 For 42LC7D-UB,42LC4D-UA
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : 0 ~ 90 %
1. Application Range.This spec sheet is applied to the 26"/32" LCD TV used LA73Echassis.
2. EspecificacinEach part is tested as below without special appointment
2.1. Temperature : 20 5C2.2. Relative Humidity : 65 10%2.3. Power Voltage : Standard input voltage
(100~240V@ 50/60Hz) Standard Voltage of each products is marked by models
2.4. Specification and performance of each parts are followedeach drawing and specification by part number inaccordance with BOM .
2.5. The receiver must be operated for about 20 minutes priorto the adjustment.
3. Test method
3.1. Performance : LGE TV test method followed.3.2. Demanded other specification
Safety : UL, CSA, IEC specification3.3. EMC : FCC, ICES, IEC specification
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5. Chroma & BrightnessCONDITION : EZ-Picture "Daylight"
No Item Min. Typ. Max. Unit Remark
1 White peak brightness 360 450 cd/m2 HDMI input, full white,
Video Black level=High
400 500 cd/m2 SLD1 module spec
2 Contrast ratio 600:1 800:1 Non dimming mode
(PC Mode)3000:1 4000:1 5000:1 Dimming mode
1. Input full black , wait 10
minute , measure black level
2. Input full white , wait 10
minute , measure white level
3 Brightness uniformity 1.3 Refer to LCD SPEC.
4 Color coordinate RED X 0.640 +/- 0.03
Y 0.343 +/- 0.03
GREEN X 0.280 +/- 0.03
Y 0.605 +/- 0.03
BLUE X 0.145 +/- 0.03
Y 0.065 +/- 0.03WHITE X 0.276 +/- 0.03
Y 0.283 +/- 0.03
5 Viewing angle 178 R/L, U/D
6 Color Temperature Standard 8,300 9,300 10,300
Cool 10,000 11,000 12,000 HDMI input,
Warm 5,500 6,500 7,500 Daylight/Cool over 85 IRE
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6. Component Video Input (Y, PB, PR)
No.Specification
RemarkResolution H-freq(kHz) V-freq(Hz)
1. 720*480 15.73 59.94 SDTV ,DVD 480I
2. 720*480 15.73 60.00 SDTV ,DVD 480I
3. 720*480 31.47 59.94 SDTV 480P
4. 720*480 31.50 60.00 SDTV 480P5. 1280*720 44.96 59.94 HDTV 720P
6. 1280*720 45.00 60.00 HDTV 720P
7. 1920*1080 33.72 59.94 HDTV 1080I
8. 1920*1080 33.75 60.00 HDTV 1080I
9. 1920*1080 27 24 HDTV 1080P
10. 1920*1080 33.75 30 HDTV 1080P
No.Specification
Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz)PC DDC
1. 640*350 31.469 70.08 25.17 DOS
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 800*600 37.879 60.31 40.00 VESA(SVGA) O
5. 1024*768 48.363 60.00 65.00 VESA(XGA) O
6. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
7. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
8. 1366*768 47.13 59.65 72
7. RGB PC- RGB PC INPUT Mode Table
- HDMI INPUT(PC/DTV)No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*480 31.469 59.94 25.17 VESA(VGA) O
2. 800*600 37.879 60.31 40.00 VESA(SVGA) O
3. 1024*768 48.363 60.00 65.00 VESA(XGA) O
4. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
5. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
6. 1366*768 47.13 59.65 72
DTV
7. 720*480 31.469 59.94 27.00 SDTV 480P
8. 720*480 31.500 60.00 27.03 SDTV 480P
9. 1280*720 44.96 59.94 74.17 HDTV 720P
10. 1280*720 45.00 60.00 74.25 HDTV 720P
11. 1920*1080 33.72 59.94 74.17 HDTV 1080I
12. 1920*1080 33.75 60.00 74.25 HDTV 1080I
13. 1920*1080 27 24.00 74.25 HDTV 1080P
14. 1920*1080 33.75 30.00 74.25 HDTV 1080P
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8. Customer Menu Setup (Shipment Condition)
No Item Condition Remark
1. Input Mode TV02CH
2. Volume Level 30
3. Mute Off
4. Aspect Ratio 16:9
5. Video EZ Picture DaylightContrast 100
Brightness 40
Color 70
Sharpness 70
Tint 0
Color-temperature Cool
XD Auto(On)
Advanced Cinema3:2 Mode(Off)
Black Level(RF,HDMI=>Low),(AV=>High)( RGB-PC,Component=>Disable)
6. Audio Audio Language Off
EZ Sound NormalBalance 0
Bass 50
Front Surround Off
TV Speaker On
7. Timer Auto clock Off
Manual Clock Off
Off Timer Off
On Timer Off
Sleep Timer Off
Auto Off Off
8. Option Aspect Ratio 16:9
Caption/Text Off
Caption Option Set By Program
Language English
Simplink On
9. Lock Lock System Off
Set password On (Default:0000)
Block channel None
Movie Rating Off
TV Rating-Children None
TV Rating-General None
Input Block Off
10. Channel Memory RF : 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 30, 51, 63
CATV : 15, 16, 17
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ADJUSTMENT INSTRUCTION
1. Application ObjectThese instructions are applied to all of the LCD TV, LA73E.
2. Notes(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolationtransformer will help protect test equipment.
(2) Adjustments must be done in the correct order.(3) The adjustments must be performed in the circumstance of
205C of temperature and 6510% of relative humidity ifthere is no specific designation.
(4) The input voltage of the receiver be must kept 110V, 60Hzwhen adjusting.
(5) The receiver must be operational for about 15 minutesprior to the adjustments.
* Perform preliminary operation after receiving 100% WhitePattern (06CH).
(Or 3. White Pattern status of Ez-Adjust)* White Pattern entry methodA) Enter into Ez-Adjust by pressing the ADJ key on the
adjustment R/C.B) 100% FULL WHITE PATTERN appears if pressing the
OK (A) key after selecting the 3.WHITE PATTERN withthe CH + / - KEY.
* It is possible to heat run the set without a separatesignal generator in this mode.
Caution : Care must be taken as afterimagephenomena may occur about the black level part ofscreen If leaving pause image turned on for morethan 20 minutes (especially inner digital pattern (13
CH), Cross Hatch Pattern (09CH) with significantblack/white contrast).
3. MICOM Download(Option)
3-1. Required Test Equipment(1) JIG-LEVER TYPE for adjusting: 1EA(2) PC & MONITOR: 2EA(3) BOARD for INTERFACE: IIC & ISP BOARD: 2EA
(4) 15P D-SUB CABLE: 2EA(5) Using the 12/15 line of D-SUB 15P
12-SDA/15-SCL
3-2. JIG Connection
3-3. Establishment Program(1) Establish LGE Monitor Tools v1.1(2) The program work and it is opened program window as
seen below.
connection
to PCconnection
to PC
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(3) Click the first icon shown in fig.9. The window seen infig.10 should appear.
3-4. Set Method(1) MCU Select: MTV512M64(2) Option
R/W Option: Auto Write(Verity)Jig Option: MysonTransmit Speed: Medium
(3) Check: Just do it with blank micom.(4) PORT
Chose Parallel Port (normal LPT1)
Attention: You must chose EPP when select Rom BIAS atLPT
3-5. Download Method(1) Click the Load File.
(2) Locate and select the correct file from your computer.(*.hex).
(3) Click the Send.
(4) When you see (ISP COMPLETE) the download iscomplete.
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6. ADC-Set Adjustment
6-1. SynopsisADC-Set adjustment to set the black level and the Gain tooptimum.
6-2. Test EquipmentService R/C, 801GF(802V, 802F, 802R) or MSPG925FA
Pattern Generator(480i/1080i The Horizontal 100% Color Bar Pattern adjust towithin 0.70.1Vp-p)
[ADC adjustment (MSPG-925Fx series) Model No. & Pattern No.]
- Model No.: #209(480i adjustment), #223(1080i adjustment)- Pattern No.: #65(7ColorBar Pattern)
6-3. Adjustment(1) Select Component1 as the input with 100% Horizontal
Color Bar Pattern(HozTV31Bar) in 480i Mode(2) After receiving signal for at least 1 second, press the ADJ
Key on the Service R/C to enter the Ez - Adjust and selectthe 2. ADC 480i Comp1.Pressing the Enter Key to adjust automatically.
(3) When the adjustment is over, 'MST3361 ComponentSuccess is displayed. If the adjustment has errors,'MST3361 Configuration Error is displayed.
(4) Select Component1 as the input with 100% HorizontalColor Bar Pattern(HozTV31Bar) in 1080i Mode.
(5) After receiving signal for at least 1 second, press the ADJKey on the Service R/C to enter the Ez - Adjust and selectthe 3. ADC 1080i Comp1/RGB.Pressing the Enter Key to adjust automatically.
(6) When the adjustment is over, 'MST3361 ComponentSuccess is displayed. If the adjustment has errors,'MST3361 Configuration Error is displayed.
(7) After the Component MST3361 adjustment is over, convertthe RGB-DTV Mode and display Pattern.When the adjustment is over, 'MST3361 RGB_DTVSuccess is displayed.
(8) Readjust after confirming the case Pattern or adjustmentcondition where the adjustment errors.(9) After adjustment is complete, exit the adjustment mode by
pressing the ADJ KEY.
Adjustment Mode
Adjustment Pattern: 480i/1080i 60Hz HozTV30 BarPattern
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7. EDID(The Extended DisplayIdentification Data)/DDC(Display Data Channel) Download
This is the function that enables Plug and Play".
7-1. HDMI EDID Data Input(1) Required Test Equipment
1) PC, Jig for adjusting DDC. (PC serial to D-subConnection equipment)
2) S/W for writing DDC(EDID data write & read)3) D-Sub cable4) Jig for HDMI Cable connection
(2) Preparation for Adjustments & Setting of Device1) Set devices as below and turn on the PC and JIG.2) Open S/W for writing DDC (EDID data write & read).
(operated in DOS mode)
7-2. EDID DATA for LA73E
O EDID for HDMI-1 (DDC (Display Data Channel) Data)EDID Block 0 table =
EDID Block 1 table =
O EDID for HDMI-2 (DDC (Display Data Channel) Data)EDID Block 0 table =
EDID Block 1 table =
O EDID for RGB-PCEDID Block 0 table =
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 | 09 48 4C 2F CE 00 31 40 45 40 61 40 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 C4 8E 21 00 00 1E 0E 1F 00 80 51 00 1E 3050 | 40 80 37 00 C4 8E 21 00 00 1C 00 00 00 FD 00 38
60 | 4B 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 98
0 | 02 03 16 F1 46 84 05 03 02 20 22 23 15 07 50 66
10 | 03 0C 00 10 00 80 01 1D 00 72 51 D0 1E 20 6E 28
20 | 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 16 20
30 | 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A 20 E0
40 | 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A D0 8A
50 | 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18 00 0060 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 25
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23
20 | 09 48 4C 2F CE 00 31 40 45 40 61 40 01 01 01 01
30 | 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28
40 | 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 16 20
50 | 58 2C 25 00 C4 8E 21 00 00 9E 00 00 00 FC 00 4C
60 | 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 | 00 38 4B 1F 3C 09 00 0A 20 20 20 20 20 20 01 66
0 | 02 03 16 F1 46 84 05 03 02 20 22 23 15 07 50 66
10 | 03 0C 00 20 00 80 8C 0A D0 8A 20 E0 2D 10 10 3E
20 | 96 00 C4 8E 21 00 00 18 8C 0A D0 8A 20 E0 2D 10
30 | 10 3E 96 00 13 8E 21 00 00 18 00 00 00 00 00 00
40 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70 | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B3
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 00 11 01 03 68 73 41 96 0A CF 30 A3 57 4C B0 23
20 | 09 50 4E A1 08 00 01 01 01 01 01 01 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 C4 8E 21 00 00 1E 0E 1F 00 80 51 00 1E 30
50 | 40 80 37 00 C4 8E 21 00 00 1C 00 00 00 FD 00 38
60 | 4B 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 | 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 D0
LCD TV SET
(or Digital Board)
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- 14 -
8. Adjustment of White Balance
8-1. The Purpose and Principal of ColorTemperature Adjustment
(1) Purpose: to reduce the difference in color temperatureamong modules
(2) Principal: A module is in full dynamic range when RGB
Gain on OSD is 192. To adjust the white balance withoutcausing full dynamic range and full data, fix one of RGBGains at 192 and control the other two by reducing themfrom 192.
8-2. Required Equipment(1) Color Analyzer : CA-110 or CA-210
(2) Automatic adjustor (with automatic adjustment necessityand the RS-232C communication being possible)
8-3. Connection Diagram of Equipmentfor Measuring (Automatic Adjustment)
Use the internal pattern to adjust White Balance. The patternis automatically given when the automatic adjustment deviceis connected or when a user presses ADJ on the remotecontroller to start Ez Adjust and then selects 6.White-Balance.
* Requirements for Automatic Adjustment
(1) The illuminance of surroundings10 lux or less; preventing light in surroundings as much aspossible
(2) The location of the Probe1) For PDP: place the color analyzer (CA-110, CA-210)
close to the surface of a module and start theadjustment.
2) For LCD: place the color analyzer (CA-110, CA-210)close to the surface of a module within 10 cm and keepthe probe of the color analyzer at 80 to 100 angle fromthe surface of a module.
(3) Aging time1) Once Aging is started, keep the power on without power
supply interruption for at least 15 minutes for heat run.2) For PDP, use the internal pattern to adjust White
Pattern.3) For LCD, use NO SIGNAL or Full White Pattern to
ensure the backlight is turned on.
8-4. Adjustment of White Balance(Automatic Adjustment)
(1) Turn on the POWER ON() of the remote controller to setthe adjustment and then start the automatic adjustment orset the Baud Rate to 115200.) of the remote controller to
(2) Start the adjustment from wb 00 00 and complete it atwb 00 ff. (Adjust the offset if necessary)
wb 00 00 the automatic adjustment of White Balance isstarted.wb 00 10 adjusting gain (internal pattern appears) isstarted.ja 00 ff adjusting datajb 00 c0
...wb 00 1f adjusting gain is completed.Adjust the offset (from wb 00 20 to wb 00 2f) if necessary.wb 00 ff the automatic adjustment of White Balance(internal pattern disappears) is completed.
CA-100+
C O L O R
A N A L Y Z E R
T Y P E ; C A - 10 0+
F u l l W h i te P a tt er n
RS-232C
Connection Diagram of Automatic Adjustment
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- 15 -
* RS-232C Command (Automatic Adjustment)
LA73E Chassis Model All]
8-5. Adjustment of White Balance(Manual Adjustment)
Required Equipment : CA-210
(1) Enter Ez - Adjust by pressing ADJ KEY on the ServiceRemote Control.
(2) Select "9. TEST PATTERN" using CH +/- Key and HEATRUN at least 30 minutes by pressing the ENTER Key.
(3) Zero Calibrate of the Color Analyzer, then attach sensor toLCD module surface when you adjust.
(4) Select 6. White-Balance of Ez - Adjust by pressing theADJ KEY on the Service R/C. Then enter adjustment modeby pressing the Right KEY (G) .(The internal pattern of full white appears by pressing G)
(5) The adjustment is conducted in three levels of colortemperature; COOL, MEDIUM, and WARM.
* Color temperature: Cool, Medium, Warm
(1) When R Gain is fixed at 192,Control G Gain and B Gain by reducing them from 192.
(2) When B Gain is fixed at 192,Control R Gain and G Gain by reducing them from 192.
(3) When G Gain is fixed to 192,Control R Gain and B Gain by reducing them from 192.
Fix one of three Gains (R Gain, G Gain, and B Gain) at 192and control the other two by reducing values from 192 to
prevent it from increasing.
(When RGB Gains are all 192, the module is in full dynamicrange.)
9. USB S/W Download (Option)
9-1. OverviewUSB Download enables quick response to S/W upgrading andhelps to configure the panel to the latest updates.
9-2. How to Download(1) Before starting USB download, ensure that the power is
turned off and the display is turned on.(2) Once the USB memory stick containing the upgraded fileis connected to the USB port on the main board, thefollowing picture appears on the screen.
(3) Check the current version at [Current TV Software VersionInformation] and the target version at [New Found TVSoftware Version Information]. Press Enter on the remotecontroller to confirm the upgrade.
(4) The following picture shows the downloading in progress.Once the download is completed, the power isautomatically turned on and off. (Otherwise, please turn thepower on and off)
(5) Once the download is completed, remove the USBmemory stick from the USB port. Press IN-START on theremote controller to check the upgraded S/W version at thetop of the screen while the display is turned on.
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
jg
jh
ji
Cool
ja
jb
jc
Mid
RS-232C COMMAND
[CMD ID DATA]
CENTER
(DEFAULT)(Decimal)
jd
je
jf
00
00
00
192
192
192
Warm
Min
Max
(Deci
mal)
64
64
64
Cool
64
64
64
Mid
64
64
64
Warm
Do not plug off.
Press EXIT to cancel the upgrade.
The software upgrade is now in progress.
Until the whole process if completed, please.
- Do not remove the memory card from the slot.
- Do not plug off.
Reading the file---Done
Upgrading---Done
The TV will restart automatically in 0 seconds.
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- 16 -
NoRGB DTV
YesAdaptiv e Picture Mode
Audio Outp ut10W*2
Freeze NoOthers
Phase, Siz eAdjust
DOS70,VGA60,S
VGA60,XGA60,WXGA60,SXGA60
RGB In (15 Pin)
YesAuto Nav igation (Link)
YesBBE
YesSRS Trusurround TX
Yes(2D)Enhanced Noise Reduction
USE scalie r On/Off OSD MenuYesXD EngineUse Br ief Inf oO(PSIP)Progr am Guide Type
1 RF1 RF(Air /Cable)RF
RemarkBroadcomFeature
TROUBLESHOOTING & BLOCK DIAGRAM
- Prouct Brief spec
-
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17/45
-Bloc
kdiagram
for
CIDTV
- 17 -
Side
AV
V,L
R
Rear
AV
V,
LR
Rear
S
YC
,LR
Side
S
YC
,LR
MNT
_V
_Ou
t
IN1
OUT1
IN4
IN1
IN4
IN5
OUT3
Comp
_1YCbCr
Comp
_2YCbCr
IN3
IN4
CVBS
CVBS
ATSC/NT
SCTuner
Ca
ble
ANT
.
64-B
it
I/F
BCM3560
12
LVDS
Trans
CXA2069(AVS
/W)
VDEC
_CVBS/S
_Y
VSB/QAM/NTSC/SI
F
SPD
IFOu
t
I2S
Ou
tpu
t
SPDIF
_OUT
FlashMemory
16MB
HDMI/DVI
RS-2
32C
X-ta
l
54MHz
R
ese
tIC
Au
dio
PWML/R
Su
bMic
om
(MTV416)
EEP
ROM
HDMI&Co
mponen
t
RGB-P
C
Au
dio
Tuner
Comp
_1
LR
Comp
_2
LR
RGB(Phone
)
LR
AUDIOADC
Au
dioR/L
I2S
I2SAu
dioInpu
t
MST3361
R/G/B
H/VSync
DVIInpu
t
Digita
lOu
tpu
t.
SDRAM
256Mbit
DDS
Data
[24]
Hsync/V
sync
/DE/Clk
2X
1
S/W
2X
1
S/W
HDCP
IIC
TMD
S
DDS
S
PDIF
Y,C
IFP/Nfor
DTV
SIFfor
NTSC
SIFfor
NTSC
US
Bforupgra
de
S/W
LR
MNT_Ou
t
AUDIODAC
IIS
TMD
S
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- 18 -
-Powr
flow
diagram
+12
.0V
+12
.0V
KIA78R09
K
IA78R09
FAN1
,2,3
FAN1
,2,3
FAN4
FAN4
SI492
5DY
SI492
5DY
MP1593
MP1593
CMO
,AUO
CMO
,AUO
+9
.0V
+9
.0V
MC3307
MC3307
CXA2069
CXA2069
ST
_5V
ST
_5V
BA033FP
BA033FP
MTV416GMF
MTV416GMF
3.3
VST
_MICOM
A3
.3V
_BCM
A3
.3V
_BCM
BCM3560
BCM3560
P_
+19V
P_
+19V
TPA3100
TPA3100
+3
.3V
+3
.3V
SC1566-2.5
S
C1566-2.5
BCM3560
BCM3560
HY
DU561622
HY
DU561622
SC1566-2.5
SC1566-2.5
D2
.6V
_BCM
A2
.6V
_BCM B
CM3560
BCM3560
SC1566-2.5
SC1566-2.5+
2.5
V_
MST
MST3361
MST3
361
BCM3560
BCM3560
S29GL128M
S29GL128M
THC63LVD
THC63
LVD
74LVC14A
74LVC14A
MST3361
MST33613
.3V
_MST
DDC
DDC
A1
.2V
_BCM
,D1
.2V
_BCM
BCM3560
BCM3560
+6
.0V
+6
.0V
PQ05DZ1U
PQ05DZ1U
CS4344
CS4344
+5
.0V
MM1732
MM1732
CS533
1A
CS5331A
FMS6407
FMS6407
FMS6400
FMS6400
TPS2042
TPS2042
7
4F08D
74F08D
M62320FP
M62320FP
TUNER
TUNER
FSA1156
FSA1156
+5V
_TU
LM75CIMX
LM75CIMX
AZ1117H-3.3
AZ1117H-3.3
BCM3560
BCM3560
D3
.3V
_BCM
KIA78R09
KIA7
8R09
5V
_PANEL
AT24C512W
AT24C512W
AT24C02N
A
T24C02N
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- 19 -
-12CCon
tro
lbloc
kdiagram
BCM3560
AV
S/W(CXA2069)
Ma
inEEPROM
4.7
K5
.0V
I2C
_Channe
l0
I2C
_Channe
l1
ATSC/NTSCTuner
I2C
_Channe
l2
I2C
_Channe
l3
Su
b-M
icom
I2C0
_5V
I2C1
_5V
I2C1
_3
.3
V
I2C2
_3
.3V
I2C3
_3
.3V
2.7
K
2.7
K3
.3V
M62320
4.7
K5
.0V
P
DPMo
du
le
I2CAddress
0x
90
0x
C2
0x
74
0x
A6
0x
1C
0x
50
0x
9C
MST3361
3.3
V
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- 20 -
-Videos
igna
lpa
thfor
Compos
ite
/S-V
ideo
/IF
MNT_V
_Ou
t
SD
_CVBS
CXA2069
OUT3
Side
AV
V,LR
Rear
AV
V,LR
Rear
S
YC
,L
R
Side
S
YC,L
R
IN1
IN4
IN1
IN4
IN3
IN4
Comp
_1
LR
Comp
_2
LR
RGB(Phone
)
LR
BCM3
550
SD
_Y
SD
_C
ANT/Ca
ble
TVIN
CVBSfrom
TUNER
FMS6400
Y/CVBS
C
OUT1/Y
OUT1/C
M_
CVBS/Y
C
M_
CVBS
C
Y
LPFfor
CVBS
TUNER
IF_
P
IF_
N
IF_
Pfrom
TUNERfor
DTV
IF_
Nfrom
TUNERfor
DTV
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- 21 -
-Videos
igna
lpa
thfor
Compos
ite
Comp1
_Y
8(3A)
Comp1
_Pb11(2A)
Comp1
_Pr
16(1A)
Comp2
_Y
9(3B)
Comp2
_Pb14(2B)
Comp2
_Pr
1(1B)
2
12
7
SW1SW2SW36
(Ou
t3)
Comp
_Y
5(Ou
t2)
Comp
_Pb
3(Ou
t1)
Comp
_Pr
L H
8(3A)
11(2A)
16(1A)
RGB
_G
9(3B)
RGB
_B
14(2B)
RGB
_R
1(1B)
2
12
7
SW1SW2SW3
6(Ou
t3)
Y/GtoLPF
5(Ou
t2)
Pb/BtoLPF
3(Ou
t1)
Pr/
RtoLPF
L H
IC5001
IC5002
Y/G
3(Y
IN)
Pb/B
5(P
BIN)
Pr/
R
7(P
BIN)
1(EXT
_SYNC)
18(SYNC
_IN)
16Comp
_Y
15Comp
_Pb
14Comp
_Pr
44(GIN+
)
43(SOGIN)
41(BIN+
)
46(RIN+
)IC704
IC4009
RGB
_G
HSync
7404
VSync
RGB
_B
RGB
_R
BCM
3550
GPIO
G
PIOforsyncse
lec
tion
HD-D
VI
Da
ta[24]
Hsync
/Vsync
/DE/Cloc
k
H,V
Sync
/Cloc
k
RGB
_HS
GPIOforsyncse
lec
tion
RGB
_HS
RGB
_VS
RGB
_HS
RGB
_VS
GPIO
G
PIOfor
Componen
t1
GPIO
G
PIOfor
Componen
t2
GPIOfor
Componen
t2
GPIOfor
Componen
t1
IC1
001
FMS6407
MST3361
MM1731
MM1732
DATA
_OUT
H/V/DE/CLK
LPF
_CTRL0
LPF
_CTRL1
LPF
_CTRL0
LPF
_CTRL1
-
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- 22 -
-Videos
igna
lpa
thfor
HDMI
IC704
BCM
3550
GPIO
GPIOfor
Interrup
t
HD-D
VI
Da
ta[0:
23]
Hsync
/Vsync
/DE/Cloc
k
H,V
Sync
/Clock
GPIO
GPIOfo
rPower
de
tec
tion
1
GPIO
GPIOfo
rHo
tp
lug
de
tec
tion
1
IC1001
M
ST3361
TMDS
1RX0+
/-
TMDS
1RX1+
/-
TMDS
1RX2+
/-
TMDS
1RX3+
/-
DDCSDA1
DDCSCL1
EEPROM
For
EDID
DDCSDA1
DDCSCL1
TMDS1
INPUT
DDC1
INPUT
TMDS
2RX0+
/-
TMDS
2RX1+
/-
TMDS
2RX2+
/-
TMDS2RX3+
/-
DDCSDA2
DDCSCL2
EEPROM
For
EDID
DDCSDA2
DDCSCL2
TMDS2
INPUT
DDC2
INPUT
HDCPSDA
HDCPSCL
EEPROM
For
HDCP
NDA
NCL
INT
DATA
_OUT
H,V
Sync
/DE
/Cloc
k
HDMI1
HDMI2
GPIO
GPIOfo
rPower
de
tec
tion
2
GPIO
GPIOfo
rHo
tp
lug
de
tec
tion
2
GPIOfor
Powe
rde
tec
tion
2
GPIOfor
Hotp
lug
de
tec
tion
2
GPIOfor
Power
de
tec
tion
1
GPIOfor
Ho
tplu
gde
tec
tion
1
-
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- 23 -
-Au
dios
igna
lpa
thfora
ll
SIFfrom
TUNER
CXA2069
Side
AV
V,LR
Rear
AV
V,L
R
Rear
S
YC,
LR
Side
S
YC,
LR
IN1
IN4
IN1
IN4
IN3
IN4
Comp
_1
LR
Comp
_2
LR
RGB(Phone
)
L
R
OUT1/R
OUT1/L
ANT/Cab
le
TUNER
AUDIOADC
(CS5331)
A
udioR
I2S
_SCK
_IN
Au
dioL
BCM3550
SIF
I2S
_LRCH
_IN
I2S
_LRCK
_IN
I2S
_SCK
_IN
I2S
_LRCH
_IN
I2S
_LRCK
_IN
SPDIF
_IN
_P
SPDIFfrom
MST3361
_R
MNT
_Ou
t
AUDIODAC
(CS4344)
I2S
_SCK
_OUT
I2S
_LRCH
_OUT
I2S
_LRCK
_OUT
I2S
_SCK
_OUT
I2S
_LRCH
_O
UT
I2S
_LRCK
_O
UT
_L
MNT
_Ou
t
Ana
log
L_
OUT
Au
dio
AMP
(TPA3100)
SPDIFOu
t
SPDIF
_OUT
_P
AUD
_LEFT
_P
AUD
_LEFT
_N
AUD
_RIGHT
_N
AUD
_RIGHT
_P
SPK
_L
_P
SPK
_L
_N
SPK
_R
_N
SPK
_R
_P
Ana
log
R_
OUT
MC3307
(OP-A
MP)
IF
_P
from
TUNER
for
DTV
IF
_N
from
TUNERfor
DTV
IF_
P
IF_
N
-
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- 24 -
-Au
dioLinksys
tem
BCM3550
CXA2069
+5V
4.7
k(R5097)
22(R3126)
COMP1
_SW
+5V
4.7
k
22(R3125)
COMP2
_SW
AE1
AC4
0(R3072
)2.7
k
(R5128)
HDMI_POWER
_1
AD24
0(R3075
)
HDMI_POWER
_2
AC22
Y23
5
(GND)
+9V
100k
(R5027)
AV1
_SW
+9V
100k
(R5069)
AV2
_SW
6(S2-1)
13(S2-2)
0(R5088)
100(R5079)
J5005
J5004
J5007
P5001
22(R305
2)
/RGB-PC
5V
_HIGH
5V
_HIGH
9V
_HIGH
9V
_HIGH
5V
_HIGH
5V
_HIGH
0V
_HIGH
IncaseofRGB-PC,
ItrequireH/W
work.
Plug-IN(LOW),Plug-OUT(HIGH)
P700
7
P700
8
P700
4
+5V 1
0k
1k
-
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- 25 -
-Au
dioInpu
tleve
lfor
RF/AV
700m
V
700m
V
Inpu
t
ICspec
Measuremen
t
wave
form
700m
V
700m
V
Measuremen
t
da
ta
PAL
NTSCan
dPAL
NTSCan
dPAL
Sys
tem
SCART-C
VBS
AV
RF
Inpu
ts
igna
l
*Measuremen
tda
tafor
RF/AVampli
tudea
tthepo
into
fBCM3550inpu
tp
in
-
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26/45
- 26 -
-Video
Inpu
tleve
lfor
S-V
ide
o/Componen
t
500m
V~
1V
700m
V
800m
V
700m
V
480i@60Hz,5
76i@50Hz
NTSCan
dPAL
Componen
t
S-V
ideo
Inpu
t
ICspec
Measuremen
t
wave
form
Measuremen
t
da
ta
Sys
tem
Inpu
ts
igna
l
*Measuremen
tda
tafor
S-v
ideo
/Com
ponen
tinpu
tamp
litu
dea
tthepo
into
f
BCM3550in
pu
tp
in
-
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27/45
- 27 -
-Ma
infea
tureo
fBCM3550
-
8/11/2019 Lg La73e Chassis 32lc7d C-ub Lcd Tv Sm
28/45
- 28 -
-Ma
infea
tureo
fBCM3550
-
8/11/2019 Lg La73e Chassis 32lc7d C-ub Lcd Tv Sm
29/45
- 29 -
-Who
lec
hipinterna
lbloc
k
-
8/11/2019 Lg La73e Chassis 32lc7d C-ub Lcd Tv Sm
30/45
- 30 -
-Brie
fdiagram
foroursys
tem
Video
Networ
k Swith
Front
Lbox
Detect
Video
Netw
orkSwith
Back
N
ULL
N
ULL
2DHDS
caler
2DH
DS
caler
MAD
MAD
CRC
Capture2
TNT/
PEP
VBP
VBP
NULL
NULL
FeedBack
Compositor
MPEG
Feeder
VideoFeede
r
ITU656
HD-DVI
VDEC0
FeedBac
k
DNR
DNR
2D
SDS
caler
VEC
Up
Scaler
UpScaler
Graphic
Graphic
VDEC1
HDMI-RX
Digital
Input
-
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- 31 -
-ADC/IFDemo
du
lator
InbandAFE
12BitA/D
InbandAFE
12BitA/D
AGCControl
ATSCVSB
Advanced
Receiver
ATSCVSB
Advanced
Receiver
ATSC
FEC
ATSC
FEC
Inband
Output
Interface
Inband
Output
Interface
OOBQPSK
Receiver
OOBQPSK
Receiver
OOB
Output
Interface
OOB
Output
Interface
DVS-167FEC
DVS-178FEC
DVS-167FEC
DVS-178FEC
OOBAFE
6BitA/D
OOBAFE
6BitA/D
AGCControl
QAMV
SB
Advanced
Receiver
QAMV
SB
Advanced
Receiver
ITU-TJ.83
Annex
A/B/CFEC
ITU-TJ.83
Annex
A/B/CFEC
NTSCIF
Demodulator
NTSCIF
Demodulator
InputBan
d
InputBan
d
InputBan
d
InputBand
InputBan
d
InputBand
Inp
ut
Band
Input
Ban
d
MUX
MUX
InputBan
d
InputBand
BCM3560DATA
TransportModule
BCM3560DATA
TransportModule
MemoryController
MemoryController
V
ideoOutput
V
ideoOutput
A
udioOutput
A
udioOutput
HSX1Serial
HSX1Serial
MPEG-2Transport
Demuxw/DVB,DES
MPEG-2Transport
Demuxw/DVB,DES
-
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32/45
- 32 -
-Be
fore
Videone
twork
Video
Netwo
rkSwith
Front
AFE
AFE
Front
End
Front
End
Y/C
Separation
Y/C
Separatio
n
Chroma
Demo
Chroma
Demo
Back
End
Back
End
VDEC
Block
BV
B
Inter
face
BV
B
Interface
MemoryInterface(SCB)
MemoryInterface(SCB)
SCB
BUS
SCB
BUS
Croma
Conversion
Croma
Conversion
Horizon
P
anScan
Horizon
P
anScan
Frame
Buffer
Frame
Buffer
De-Inter
De-Inter
MPEG
Feeder
B
VB
Interface
B
VB
Inte
rface
SCB
DATA
Buffer
SCB
DATA
Buffer
Pixel
Cropping
Pixel
Cropping
Color
Expansion
Color
Expansion
C
olor
Key
C
olor
K
ey
Alpha
Pre-
Multipl
Alpha
Pre-
Multipl
GraphicFeederBlock
Horizon
Scaler
Horizon
Scaler
Gamma
Correction
Color
Convertor
BVB
Interface
CLUT
CLUT
???
???
RGB
Converter
RGB
Converter
Input
Timing
Adjust
Input
Timing
Adjust
DVI-Secondary
BVB
Int
erface
B
VB
Inte
rface
???
???
RGB
Converter
RGB
Converter
Input
Timing
Adjust
Input
Timing
Adjust
DVI-Primary
BVB
Int
erface
B
VB
Inte
rface
HDMI
Receive
Decode
HDMI
Receive
Decode
HDCP
Decrypt
HDCP
Decrypt
HDMIBlock
HDMI
TMDS
Pins
HDMI
TMDS
Pins
Lbox
Detect
Lbox
Detect
TAB
2D-Scaler
TAB
2D
-Scaler
2D-Scaler
2D
-Scaler
MAD-IT
MAD-IT
NULL
NULL
Fe
edBack
FeedBack
SCB
BUS
SCB
BUS
Croma
Conversion
Croma
Conversion
Horizon
PanScan
Horizon
P
anScan
Frame
Buffer
Frame
Buffer
De-Inter
De-Inter
VideoFeeder
B
VB
Interface
B
VB
Inte
rface
ANALOG
Pins
ANALOG
Pins
HDMI
Pins
HDMI
Pins
DVI
Pins
DVI
Pins
CoefTable
-
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33/45
- 33 -
-Sca
leran
dMAD
Video
Netwo
rkSwith
Front
Lbox
Detect
Lbox
Detect
MUX
MUX
BVB
Receiver
BVB
Receiver
Vertical
Scaler
Vertical
Sca
ler
TAB
TAB
MUX
MUX
MUX
MUX
Hoarizonal
Scaler
Hoarizonal
Sca
ler
TAB2D-Scaler
MUX
MUX
BVB
Receiver
BVB
Receiver
Vertical
Scaler
Vertical
Sca
ler
MUX
MUX
MUX
MUX
Hoarizonal
Scaler
Hoarizonal
Sca
ler
2D-Scaler
BVB
Receiver
BVB
Receiver
Pixel
Distribution
Block
Pixel
Distribution
Block
Pixel
Processing
Block
Pixel
P
rocessing
Block
SCB
Output
SCB
Output
BVB
Interface
BVB
Interface
FieldContro
lBlock
FieldControlBlock
MAD
Video
Netwo
rkSwith
Back
CRC
CRC
Capture0
Ca
pture0
Capture1
Ca
pture1
Capture2
Ca
pture2
NULL
NULL
NULL
NULL
FeedBack
FeedBa
ck
VBP
VBPCo
mpositor
Compositor
PEP
PEP
GraphicFeeder
Block
-
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34/45
- 34 -
-PEPan
dCompos
itor
Video
Ne
two
rkSw
ith
Fron
t
CRC
CRC
Video
Ne
two
rkSw
ith
Fron
t
BVB
Rece
iver
BV
B
Rece
iver
Pac
king
&
RDMATrig
Pac
king
&
RDMATrig
Burs
t
FIFO
Burs
t
FIFO
Cap
ture
Bloc
k
DMA
DMA
SCB
BUS
SCB
BUS
NULL
NULL
Fee
dBac
k
Fe
edBac
k
VBP
(Video
Bypass
)
V
BP
(Video
Bypass
)
Grap
hicFee
der
Bloc
k
BVB
Rec
iever
BVB
Rec
iever
CAB
CAB
422TO444
Convers
ion
422TO444
Convers
ion
LAB
LAB
Co
lor
CLIP
Co
lor
CLIP
Video
Intra-Surface
(WithPEP)
Luma
Key
ing
Luma
Key
ing
BVB
Interface
BVB
Interface
Co
lor
Br
ight
Adjus
t
(Ma
trix)
Co
lor
Br
ight
Adjus
t
(Ma
trix)
C
ropp
ing
Cr
opp
ing
Bac
kGroun
d
Co
lor
Y/C
b/Cr
Reg
ister
Y/C
b/Cr
Reg
ister
BVB
Rec
iever
BVB
Rec
ieverG
rap
hics
Intra-Surface
Croppin
g
Croppin
g
BVB
Interface
BVB
Interface
Screen
Compos
iter
Screen
Compos
iter
Su
rfaces
MUX
Su
rfaces
MUX
Blen
d0
Blen
d0
Blen
d1
Blen
d1
Blen
d2
Blen
d2
Fore
Groun
d
Fore
Groun
d
Fore
Groun
d
Bac
k
Groun
d
Bac
k
Groun
d
Bac
k
Groun
d
BVB
Interface
BVB
Interface
PEP
COMPOSITOR
BVB
R
ec
iever
BVB
R
ec
iever
422TO444
Convers
ion
422TO444
Convers
ion
Video
Intra-Surface
(Withou
tPEP
)
Co
lor
Br
ight
Adjus
t
(Ma
trix)
Co
lor
Br
ight
Adjus
t
(Ma
trix)
Luma
Key
ing
Luma
Key
ing
Cropp
ing
Cropp
ing
BVB
Interface
BVB
Interface
-
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35/45
- 35 -
-Bac
ken
d(Digita
lan
dAnalog
)
VBP
(Video
Bypass)
VBP
(Video
Bypass
)
Video
Compos
itor
Video
Compos
itor
Mux
Mux
Mux
Mux
CSC
(Matrix)
CSC
(Matrix)
Digital
Video
Formatter
Digital
Video
Formatter
VIDEO
_ENC
_PRIM
_CONTROL.S
ELECT
656
656
CSC
(Matrix)
CSC
(Matrix)
Digital
Video
Formatter
Digital
Video
Formatter
DVI
Interface
DVI
Interface
Mux
Mux
Mux
Mux
Cross
Bar
Cross
Bar
CSC
(Matrix)
CSC
(Matrix)
Video
Fo
rmatter
V
ideo
Formatter
SUB-Carrier
Modulator
SUB-Carrier
Modulator
Input
Tim
ing
Inp
ut
Tim
ing
VIDEO
_ENC
_BYPASS
_CONTROL.S
ELE
CT
Digital
Timing
RAM
Digital
Timing
RAM
Digital
Timing
Generator
Digital
Timing
Gener
ator
Digital
Timing
Generator
Digital
Timing
Gener
ator
MISC
_ITU656
_IN
_MUX.S
ELECT
MISC
_DVI_IN
_MUX.S
ELECT
656
DVI
DAC3
DAC2
DAC1
DAC0
-
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36/45
- 36 -
-Exp
lana
tion
Mpeg
Fee
derA
ndVideo
Fee
der
(MFDand
VFD)
-Mpeg
Fee
deris
ada
tapa
tho
fVSBor
QAMdeco
de
ds
igna
l.Theses
igna
lsgo
tothe
Minititano
fBCM3
550
.
-In
them
inititan
bloc
kdoprocess
ing
the
MPE
Gan
dv
ideo.
VDEC(VideoD
isp
lay
Deco
der)
-Thisbloc
khas
severa
lde
tailedbloc
k.
Itcan
han
dlethe
inpu
tcompos
ites
igna
lforexamp
le,
Y/Csepara
tion,
co
lor
deco
ding
,au
toga
incon
tro
l,e
tc.
AFE
AFE
Front
End
Front
End
Y/C
Separation
Y/C
Separation
Chroma
Demo
Chroma
Demo
Back
End
Back
End
VDECDe
tailBloc
k
BVB
Interface
BVB
Interface
Digita
lInpu
t
-Digita
linpu
tcan
han
dledigita
lv
ideos
ignal.
Inoursys
tem
throug
hthispa
th,
componen
t,RGBPC
,HDMI/DVIs
igna
ls
are
deco
de
d.S
othispa
thisvery
important
bloc
kinoursys
tem.
Exp
lana
tion
-
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37/45
- 37 -
-TV/CATVdoesn
'tdisp
lay
CheckTU4001Pin9
(Videooutput)
Canyouseethen
ormalsignal?
Checktheinput(Pin63)ofAV
switch(IC5
003).
Canyouseethenor
malwaveform?
Checktheoutput(Pin56)ofAV
switch(IC5
003).
Canyouseethenor
malwaveform?
Checktheinput(Pin1
)ofLPF(IC4006).
Canyouseethenor
malwaveform?
YES
YES
YES
NO
C
ouldyoumeasurevoltageofTU4001&
IIClines?
Aretheyallnormal?
Checktheoutput(Pin8
)ofLPF(IC4006).
Canyouseethenor
malwaveform?
YES
Checktheinput
(PinH26)of
BCM3550(IC
4006).
Measurewaveforma
tC
1010becauseits
moreeasyto
check.
Canyouseethenor
malwaveform?
YES
NO
Youshouldchec
kpowerline
&IIClin
es.
YES
YoushouldreplaceTUNER.
NO
AftercheckingthePowerofAVswitchyou
shoulddecidetoreplaceAVswitchornot.
NO
AftercheckingthePowerofAVswitchyou
shoulddecidetoreplaceAVswitchornot.
NO
AftercheckingthePowerofLPFy
oushould
decidetoreplaceLPF
orn
ot.
NO
AftercheckingthePowerofLPFy
oushould
decidetoreplaceLPF
orn
ot.
YEX
Thisboardhasbigproblembeca
useMain
chip(BCM3550)havesometro
ubles.
Aftercheckingthoroughlyallpathonceagain,
YoushoulddecidetoreplaceBCM3
550ornot.
-
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38/45
- 38 -
-Video
doesn
'tdisp
lay
CheckJ5007Pin3C
Canyouseethenormalwaveform?
Checktheinput(Pin1orPin8)ofAV
switch(IC5003).Pin1isforvideo1,Pin8
is
forvideo2.
Canyouseethenormalwaveform?
Checktheoutput(Pin56)ofAV
switch(IC5003).
Canyouseethenormalwaveform?
C
hecktheinput(Pin1)ofLPF(IC4006).
Canyouseethenormalwaveform?
YES
YES
YES
NO
J5007mayhave
problem.Replacethis
Jack.
Ch
ecktheoutput(Pin8)ofLPF(IC4006).
Canyouseethenormalwaveform?
YES
Checktheinput(PinH26)of
BCM3550(IC4006).
Measurewaveforma
tC1010becauseits
moreeasytocheck.
Canyouseethenormalwaveform?
YES
NO
AftercheckingthePowerofAVswitchyou
shoulddecide
toreplaceAVswitchornot.
NO
AftercheckingthePowerofAVswitchyou
shoulddecide
toreplaceAVswitchornot.
NO
Afterchecking
thePowerofLPFyoushould
decide
toreplaceLPF
ornot.
NO
Afterchecking
thePowerofLPFyoushould
decide
toreplaceLPF
ornot.
YEX
Thisboardha
sbigproblembecauseMain
chip(BCM3
550)havesometroubles.
Aftercheckingthoroughlyallpathonceagain,
Youshoulddec
idetoreplaceBCM3550ornot.
-
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39/45
- 39 -
-Componen
tdoesn
'tdisp
lay
CheckJ5004,J5005.
C
anyouseethenormalwaveform?
ChecktheinputofComponent
switch(IC5001,IC5002).
C
anyouseethenormalwaveform?
ChecktheoutputofComponent
switch(IC5001,IC5002).
C
anyouseethenormalwaveform?
C
hecktheinputofMST3361(IC7004
Pin41,44,46).
C
anyouseethenormalwaveform?
YES
YES
YES
NO
J5004,J5005may
haveproblem.Replacethis
Jack.
Ch
ecktheoutputofMST3361(IC7004).
C
anyouseethenormalwaveform?
YES
Checktheinputandoutputof
BCM
3550(IC4006).Especiallyyoushould
check
TheH,Vsyncandclock.
C
anyouseethenormalwaveform?
YES
NO
Aftercheckingth
einputTRofcomponent,you
shoulddecideto
replacecomponentswitchor
not.
NO
NO
Afterchecking
thePowerofMST3361you
shoulddecide
toreplaceMST3361ornot.
NO
YEX
ThisboardhasbigproblembecauseMain
chip(BCM3550)havesometroubles.
Aftercheckingthoroughlyallpathonceagain,
Youshoulddeci
detoreplaceBCM3550ornot.
Afterchecking
thePowerofcomponentswitch
youshoulddecidetoreplacecomponentswitch
ornot.
Afterchecking
thePowerofMST3361you
shoulddecide
toreplaceMST3361ornot.
-
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40/45
- 40 -
-RGB
_PCdoesn
'tdisp
lay
CheckinputconnectP7004.
C
anyouseethenormalwaveform?
ChecktheinputofComponent
switch(IC5002).
C
anyouseethenormalwaveform?
ChecktheoutputofComponent
switch(IC5002).
C
anyouseethenormalwaveform?
C
hecktheinputofMST3361(IC7004
Pin41,44,46).
C
anyouseethenormalwaveform?
YES
YES
YES
NO
P7004
mayhaveproblem.ReplacethisJack.
Ch
ecktheoutputofMST3361(IC7004).
C
anyouseethenormalwaveform?
YES
Checktheinputandoutputof
BCM
3550(IC4006).Especiallyyoushould
check
TheH,Vsyncandclock.
C
anyouseethenormalwaveform?
YES
NO
Afterchecking
theinputTRofRGBHV,you
shoulddecideto
replacethesecomponentsor
not.
NO
NO
Afterchecking
thePowerofMST3361you
shoulddecide
toreplaceMST3361ornot.
NO
YEX
ThisboardhasbigproblembecauseMain
chip(BCM3550)havesometroubles.
Aftercheckingthoroughlyallpathonceagain,
Youshoulddeci
detoreplaceBCM3550ornot.
Afterchecking
thePowerofRGBswitchyou
shoulddecidetoreplacecomponentswitchor
not.
Afterchecking
thePowerofMST3361you
shoulddecide
toreplaceMST3361ornot.
-
8/11/2019 Lg La73e Chassis 32lc7d C-ub Lcd Tv Sm
41/45
- 41 -
-HDMIdoesn
'tdisp
lay
CheckinputconnectP7007.
Canyouseethenormalwaveform?
Chec
kDDCcommunicationlines(IC7013
Pin5,6)
Che
cktheinputofMST3361(IC7004)
ThissignalisTMDS.
Canyouseethenormalwaveform?
YES
YES
NO
P7007mayhavepro
blem.ReplacethisJack.
Chec
ktheoutputofMST3361(IC7004).
Canyouseethenormalwaveform?
YES
Checktheinputandoutputof
BCM3
550(IC4006).Especiallyyoushould
check
TheH,Vsyncandclock.
Canyouseethenormalwaveform?
YES
NO
NO
Aftercheckingthe
traceofTMDSlinesandpowerof
MST3361,yousho
ulddecidetoreplaceMST3361or
not.
NO
YEX
Thisboardhasb
igproblembecauseMain
chip(BCM355
0)havesometroubles.
Aftercheckingtho
roughlyallpathonceagain,
Youshoulddecide
toreplaceBCM3550ornot.
Afterchecking
thePowerofthischip,you
shoulddecidetoreplacethisornot.
AftercheckingthePowerofMST3361you
shoulddecidetoreplaceMST3361ornot.
YES
Chec
kHDCPcommunicationlines(IC700
5
Pin5,6)
NO
Aftercheckin
gthePowerofthischip,you
shoulddecidetoreplacethisornot.
-
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42/45
- 42 -
EXPLODED VIEW
430
600
301
300
200
590
120
530
201
580
520
400
521
203
204
205
202
206
591
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
-
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43/45
-
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44/45
-
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45/45
Mar., 2007
Printed in KoreaP/NO : MFL36768813