Chapter 09 page 1Provided By: Juan Carlos Rodriguez

FTV2.3

POWER SUPPLY

REPAIR METHOD

FTV2.3

POWER SUPPLY

REPAIR METHOD

Chapter 09 page 2Check VS and VA Output Load

SERVICE TIP:If the Vs input of the PDP is short circuited a simple test can be done:Disconnect the set from the mains.Disconnect ALL cables between PSU and PDP.Connect a regulated DC power supply (current limited to 1 A) directly to the Vs input of the YSUS board of the PDP(pin 9 of connector CN 33) and the chassis of the FTV.Ramp-up the voltage slowly to maximal 5 V. If the current increases to 1 A, the PDP is defect.The same can be done for the Vs input on the XSUS board: pin 10 of connector CN 23.

The Va inputs on the various boards can also be checked with the same procedure:The tests must be done on the connectorsCN23: pin 1 (XSUS-board)CN42: pin 1 (ABUSR-board)CN52: pin 1 (ABUSL-board).

SERVICE TIP:If the Vs input of the PDP is short circuited a simple test can be done:Disconnect the set from the mains.Disconnect ALL cables between PSU and PDP.Connect a regulated DC power supply (current limited to 1 A) directly to the Vs input of the YSUS board of the PDP(pin 9 of connector CN 33) and the chassis of the FTV.Ramp-up the voltage slowly to maximal 5 V. If the current increases to 1 A, the PDP is defect.The same can be done for the Vs input on the XSUS board: pin 10 of connector CN 23.

The Va inputs on the various boards can also be checked with the same procedure:The tests must be done on the connectorsCN23: pin 1 (XSUS-board)CN42: pin 1 (ABUSR-board)CN52: pin 1 (ABUSL-board).

The next pages explains how to repair the power supply outside theset, with fictive loads

Chapter 09 page 3Repair The Power Supply Out the Set

Short circuit On/Off switch, pin 1 and 2 connector 319.

Connect VCEGO (p13) and VSAGO (p15) of CN307 to a +2,5V from the +3,3v STBY SW.

For a regulated output voltage, connect test point VRS (pin 7) and VRA (pin 9) of CN307 to + 1V.Connect to the two solder island near connector 307 (flex foil connector).

Load +3,3V stby with 15 Ohm resistor (I must be 0,2A).

Load Vs with Lamp on CN323 pin 10. (lamp220V/75W I =176mA (82,3V))

Vs Min load between 0,1 to 0,5A, Max load = 0,5A

Load VA with lamp on CN 323 pin 1. (lamp 220V/100W I = 200mA (53,6V))

VA Min load between 0,1A to 0,5A Max load = 2A

Load Vcc (5V) with resistor 8,2 Ohm, the Max load for VCC = 7A.

Load 3V3 with resistor 3,3 Ohms or 1,5 Ohm

Connect power supply to mains, by connector 308.

Short circuit On/Off switch, pin 1 and 2 connector 319.

Connect VCEGO (p13) and VSAGO (p15) of CN307 to a +2,5V from the +3,3v STBY SW.

For a regulated output voltage, connect test point VRS (pin 7) and VRA (pin 9) of CN307 to + 1V.Connect to the two solder island near connector 307 (flex foil connector).

Load +3,3V stby with 15 Ohm resistor (I must be 0,2A).

Load Vs with Lamp on CN323 pin 10. (lamp220V/75W I =176mA (82,3V))

Vs Min load between 0,1 to 0,5A, Max load = 0,5A

Load VA with lamp on CN 323 pin 1. (lamp 220V/100W I = 200mA (53,6V))

VA Min load between 0,1A to 0,5A Max load = 2A

Load Vcc (5V) with resistor 8,2 Ohm, the Max load for VCC = 7A.

Load 3V3 with resistor 3,3 Ohms or 1,5 Ohm

Connect power supply to mains, by connector 308.

Chapter 09 page 4Output Connectors

CN319 P3 CN307 P3CN333 and CN323 P7

Pin 9

Power OK

P3P7

VCEGO 2,5VVSAGO 2,5V VRA & VRS 1V

Chapter 09 page 5Flow Chart Overview Check Points

Check +V standby power supply, + 3,3V and +5V stby on CN319.Check +V standby power supply, + 3,3V and +5V stby on CN319.

Check +Vs switched output voltage on pin 8,9,10 CN323 or pin 7,8,9 CN333 around 80……85VCheck +Vs switched output voltage on pin 8,9,10 CN323 or pin 7,8,9 CN333 around 80……85V

Check + Va output voltage on pin 1 CN323 = around 50….55VCheck + Va output voltage on pin 1 CN323 = around 50….55V

Check Preconditioner +395V on fuse1004.Check Preconditioner +395V on fuse1004.

Check + Va output voltage on pin 1 CN323 = around 50….55V

Check + Vcc output voltage on pin 1 CN333 = 5,2VCheck + Vcc output voltage on pin 1 CN333 = 5,2V

Check + 3V3 output voltage on pin 8,9,10,11,12 of CN305 = 3,3VCheck + 3V3 output voltage on pin 8,9,10,11,12 of CN305 = 3,3V

Check Power OK line on pin 9 CN319, must be high (4,5V).Check Power OK line on pin 9 CN319, must be high (4,5V).

Chapter 09 page 6Switched Standby Voltages

+5V Stby out +3,3V Stby out

Minimum load for the +3,3V switched Stby supply

is about 0,2A or 16 ohm

P2

Chapter 09 page 7Standby Supply Is Not Correct ?

Check V on

drain IC7500?

Fus.1400,

D6512, D6513, R3506

<100V

>100V

Conditions for normal operating mode of the Stby supply;

Load is about 200mA on the 3,3V output

Fus.1400,

D6512, D6513, R3506Pin 1 IC7500 = 5,8V ?

Check secondary part

Short circuit and

Control loop

Check also

the +25V Hot from Stby PS

Reference is primary groundP2

Chapter 09 page 8Check Preconditioner

Drain T7610

P5

Pin 11 Gate

Pin 13 oscil.Preconditioner output

Fuse 9004 = 395V

Chapter 09 page 9Check Preconditioner

Output of D6600 =255V

V start-up pin 16 IC7650 = 395V

Check on IC7650

•Pin 12 Vcc = 14,5V

•Pin 1 Vref = 5V

•Pin 13 Oscilator

In normal working conditionsoutput of preconditioner = 395V on

fuse 1004

Tip, it is also possible to checkthe preconditioner without load

by removing fuse 1004

Check on IC7650

•Pin 12 Vcc = 14,5V

•Pin 1 Vref = 5V

•Pin 13 Oscilator

Pin 11 Gate

Voltage feedback pin 3 VFB =5V

Current sense pin 6 CS

Check +25V Hot

preconditioner output = 24,5V

Tip, it is also possible to checkthe preconditioner without load

by removing fuse 1004

P5

Chapter 09 page 10Start up Conditions LLC Supply

Standby supply is switched on and is in continous mode, 3,3V and 5V standby are OK

VCEGO and VSAGO are connected to 2,5V

T7352 conducts, T7348 is blocked

T7391 is blocked, T73993 is blocked

Supply_on line = H and T7460, T7465 and T7470 conducts

Check Load on standby supply

Check latch, Thy6348 must be blocked,

If not check protection part P3

Diagram P3

Diagram P2

Diagram P2

P2

P3

25V_Hot Standby Supply is OK

SW25V_Hot from preconditioner is OK

Relay 1450 & 1460 is closed

395V Preconditioner is OK

Ic7093 provide current to pin 15 control IC7001 LLC supply

Check +16V provided by Ic7093

Oscillator and OA/OB Ic7001

Diagram P5

Diagram P6

P5

P6

Chapter 09 page 11Check Vs Supply (LLC)

LLC control IC Bias supply IC7093 Primary ground

2

P6

+Vs switched

on pin 10 CN323

Vs=70+10Vrs

= around 80 …85V

4

Pin 3 and 6 T5002

or C2011/C2017

Chapter 09 page 12Check LLC Supply Control Part IC7001

Start up conditions +25v HOT from stbysupply and SW25V Hot from

preconditionner are OK?

Check DC voltages IC7001 Pin

•15 Vcc = 16,5V

•5 Vref = 5,1V

•10 Fault input = 0V

Check DC voltages IC7001 Pin

•15 Vcc = 16,5V

•5 Vref = 5,1V

•10 Fault input = 0V

Check by oscilloscope IC7001 Pin

1 Oscil, drive output 14 OA, 12 OB

P6

If LLC control part does´n start upcheck with external DC power

supply, see next page

Chapter 09 page 13Check LLC Control Part, With External DC Power Supply

Connect a external DC power supply

The + to the output of IC7093 (metal part), - to primary ground on cooling plate LLC

Oscilloscope is connected to oscillator pin 1

Adjust the current output of the external DC power supply to 100mA max

Adjust the output voltage to 16V

Control Ic is starting up at 16V, current = 70mA

Check oscillator, One shot timer

OA and OB

Grid Ts7005, Ts7006

See voltages and oscillogrammes next pageP6

Chapter 09 page 14LLC Supply Control Part

17V

oscil

One shot

OA

4,3V

2,7V

IC7001

MC34067PRef 5,1V

4,9V

OB

1,8V

4,9V

4,9V

0,6V

IC7001

MC34067P

P6

Chapter 09 page 15VS Switch & Sequence Discharge Circuit

Start Up Sequence

LLC has started

Pulses are aligned and rectified by D6054 & D6055

Power OK line is H T7058 conducts

Switch Off Sequence

LLC is switched off

Or +5V standby is switched off

Or Power OK line drops

VS drops & Power OK Line will drop

VSA_Control Line will be High

T7050 conducts

Vs is switched

VSA_Control is Low

T7059 & T7052 are blocked

VSA_Control Line will be High

T7058 will block

T7059 conducts

T7050 blocks

T7052 conducts andVS is directly discharged,while VA is discharged if VS is lower than VA

P7

Chapter 09 page 16Sart Up Conditions VA Supply

LLC supply has started up and Vs unsw. 77V…95V from LLC is OK

VSAGO is connconnected to +2,5V

T7376 and T7375 conducts

VSA_control line is Low, T7134 is blocked

Vs_unsw = OK, T7375coducts

Diagram P3

Digram P7

P3

VSA_control line is Low, T7134 is blocked

Start up current is provided byT7110, T711 and from Drain

Ic7112 to pin 1 VCC

Start up VA

Check also T7058

Power OK line will beH but with some delay

P7

Chapter 09 page 17Check VA Supply

VA DC output pin 1 CN323Drain T7117

VA Control Ic7112

CN323

1 +VA on pin 1 CN323

Va=30+20Vra

= around 50…..55V.

P7

Chapter 09 page 18VCC Supply Start up Conditions

LLC is OK

CN307 pin 13 VCEGO=2,5V

Ts7352 conducts, Ts7351 is blocked

Diagram P3

Diagram P7

P3

VCC_Go and +18V LLC are on H level

T7200 conducts and provide start up curent

Start up current is provided by Drain Ic7212

Diagram P7

P7

Chapter 09 page 19VCC Output Voltage

Check +VCC = 5,2V

or pin 3 CN323

Grid T7217 Drain 7217

3

CN323

Control IC7712

CN323

P7

Chapter 09 page 203V3 Start up Conditions

+18V from LLC supply is OK

IC7260 VCC pin 7 & 8 = 17V

3V3 OVP is Low, Thy6260 is blocked

Diagram P6

Diagram P7

3V3 OVP is Low, Thy6260 is blocked

Check Oscillator pin 1

Check 3,3V OVP

T7389 & IC7330C

P7

Chapter 09 page 213,3V Supply

Oscillator Pin1 Output Pin2/3 3V3 outputPin 9 BootPin 17 SS

P7

Chapter 09 page 223V3 Power Supply Repair With External DC Power Supply

Connect an external DC power supply on C2261 and adjustthe output to 19V, limit the current to 700mA max.

Check the output voltage 3,3V ?

Oscillator pin 1

Vcc = 19V

Pin 16 = 5,1V.

Pin 17 SS = 18V

Pin 11 = 0,7V

Pin 12 = 3,2V (if power supply is OK)

Check if there is no short circuit on the output.

Oscillator pin 1

Vcc = 19V

Pin 16 = 5,1V.

Pin 17 SS = 18V

Pin 11 = 0,7V

Pin 12 = 3,2V (if power supply is OK) P7

Chapter 09 page 23Alignment Vs and Va After Power Supply Repair

VA adjust R3127

After repair the +Vs and +VA must beadjusted

VS and VA test connector

VS adjust

Chapter 09 page 24Additional Info For Power Supply Alignment

Please keep in mind that in case of the following combinations between PSU's and PDP's no oralmost no alignments are needed of the Vs and Va:

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU: Keep theSW feedback loop OFF and align both the Vs and Va as described in the Service manual.

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU withprecision resistors: The SW feedback loop can be switched on and then the Va has to checked and alignedwith an accuracy of +/- 1,5V and the potentio meter of the Vs should be positioned in the middle. No furtheralignments needed.

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .4 PSU: Switch onthe SW feedback loop and no further alignments are needed.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU: Keepthe SW feedback loop OFF and align both the Vs and Va as described in the Service manual.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU withprecision resistors: Switch on the SW feedback loop and no further alignments are needed.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .4 PSU:Switch on the SW feedback loop and no further alignments are needed.

The SW feedback loop can be found in the SAM menu.

Please keep in mind that in case of the following combinations between PSU's and PDP's no oralmost no alignments are needed of the Vs and Va:

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU: Keep theSW feedback loop OFF and align both the Vs and Va as described in the Service manual.

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU withprecision resistors: The SW feedback loop can be switched on and then the Va has to checked and alignedwith an accuracy of +/- 1,5V and the potentio meter of the Vs should be positioned in the middle. No furtheralignments needed.

PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .4 PSU: Switch onthe SW feedback loop and no further alignments are needed.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU: Keepthe SW feedback loop OFF and align both the Vs and Va as described in the Service manual.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU withprecision resistors: Switch on the SW feedback loop and no further alignments are needed.

PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .4 PSU:Switch on the SW feedback loop and no further alignments are needed.

The SW feedback loop can be found in the SAM menu.

Chapter 09 page 25

End of the repair methodpresentation

End of the repair methodpresentation

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