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Related Manuals for Philips FTV2.3
Summary of Contents for Philips FTV2.3
- Page 1 Chapter 09 page FTV2.3 POWER SUPPLY REPAIR METHOD...
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Page 2: Service Tip
Check VS and VA Output Load Chapter 09 page 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. -
Page 3: Chapter 09 Page 3
Repair The Power Supply Out the Set Chapter 09 page 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). -
Page 4: Chapter 09 Page 4
Output Connectors Chapter 09 page CN319 P3 CN333 and CN323 P7 CN307 P3 Pin 9 Power OK VSAGO 2,5V VCEGO 2,5V VRA & VRS 1V... -
Page 5: Chapter 09 Page 5
Flow Chart Overview Check Points Chapter 09 page 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 Preconditioner +395V on fuse1004. Check Preconditioner +395V on fuse1004. Check +Vs switched output voltage on pin 8,9,10 CN323 or pin 7,8,9 CN333 around 80……85V Check +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….55V... - Page 6 Switched Standby Voltages Chapter 09 page Minimum load for the +3,3V switched Stby supply is about 0,2A or 16 ohm +5V Stby out +3,3V Stby out...
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Page 7: Chapter 09 Page 7
Standby Supply Is Not Correct ? Chapter 09 page Conditions for normal operating mode of the Stby supply; Load is about 200mA on the 3,3V output Check V on drain IC7500? <100V >100V Fus.1400, D6512, D6513, R3506 Pin 1 IC7500 = 5,8V ? Check also Check secondary part the +25V Hot from Stby PS... - Page 8 Check Preconditioner Chapter 09 page Drain T7610 Pin 11 Gate Pin 13 oscil. Preconditioner output Fuse 9004 = 395V...
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Page 9: Chapter 09 Page 9
Check Preconditioner Chapter 09 page In normal working conditions output Output of D6600 =255V of preconditioner = 395V on fuse V start-up pin 16 IC7650 = 395V 1004 Check on IC7650 •Pin 12 Vcc = 14,5V •Pin 1 Vref = 5V Tip, it is also possible to check the preconditioner without load by •Pin 13 Oscilator... - Page 10 Start up Conditions LLC Supply Chapter 09 page Diagram P2 Standby supply is switched on and is in continous mode, 3,3V and 5V standby are OK Check Load on standby supply VCEGO and VSAGO are connected to 2,5V Diagram P3 T7352 conducts, T7348 is blocked Check latch, Thy6348 must be blocked, If not check protection part P3...
- Page 11 Check Vs Supply (LLC) Chapter 09 page Primary ground LLC control IC Bias supply IC7093 +Vs switched on pin 10 CN323 Vs=70+10Vrs = around 80 …85V Pin 3 and 6 T5002 or C2011/C2017...
- Page 12 Check LLC Supply Control Part IC7001 Chapter 09 page Start up conditions +25v HOT from stby supply 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 by oscilloscope IC7001 Pin If LLC control part does´n start up check with external DC power supply,...
- Page 13 Check LLC Control Part, With External DC Power Supply Chapter 09 page 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...
- Page 14 LLC Supply Control Part Chapter 09 page One shot 4,3V oscil 2,7V IC7001 MC34067P Ref 5,1V 1,8V 4,9V 4,9V 0,6V 4,9V...
- Page 15 VS Switch & Sequence Discharge Circuit Chapter 09 page Start Up Sequence Switch Off Sequence LLC is switched off LLC has started Or +5V standby is switched off Or Power OK line drops Pulses are aligned and rectified by D6054 & D6055 VS drops &...
- Page 16 Sart Up Conditions VA Supply Chapter 09 page LLC supply has started up and Vs unsw. 77V…95V from LLC is OK Diagram P3 VSAGO is connconnected to +2,5V T7376 and T7375 conducts Vs_unsw = OK, T7375 coducts Digram P7 VSA_control line is Low, T7134 is blocked Check also T7058 Start up current is provided by T7110, T711 and from Drain...
- Page 17 Check VA Supply Chapter 09 page VA Control Ic7112 VA DC output pin 1 CN323 Drain T7117 +VA on pin 1 CN323 Va=30+20Vra = around 50…..55V. CN323...
- Page 18 VCC Supply Start up Conditions Chapter 09 page LLC is OK Diagram P3 CN307 pin 13 VCEGO=2,5V Ts7352 conducts, Ts7351 is blocked Diagram P7 VCC_Go and +18V LLC are on H level T7200 conducts and provide start up curent Start up current is provided by Drain Ic7212...
- Page 19 VCC Output Voltage Chapter 09 page Check +VCC = 5,2V or pin 3 CN323 Grid T7217 Drain 7217 CN323 Control IC7712...
- Page 20 3V3 Start up Conditions Chapter 09 page Diagram P6 +18V from LLC supply is OK IC7260 VCC pin 7 & 8 = 17V Diagram P7 3V3 OVP is Low, Thy6260 is blocked Check 3,3V OVP T7389 & IC7330C Check Oscillator pin 1...
- Page 21 3,3V Supply Chapter 09 page Oscillator Pin1 Pin 17 SS Output Pin2/3 Pin 9 Boot 3V3 output...
- Page 22 3V3 Power Supply Repair With External DC Power Supply Chapter 09 page Check if there is no short circuit on the output. Connect an external DC power supply on C2261 and adjust the output to 19V, limit the current to 700mA max. Check the output voltage 3,3V ? Oscillator pin 1 Vcc = 19V...
- Page 23 Alignment Vs and Va After Power Supply Repair Chapter 09 page VA adjust R3127 VS and VA test connector VS adjust After repair the +Vs and +VA must be adjusted...
- Page 24 Additional Info For Power Supply Alignment Chapter 09 page Please keep in mind that in case of the following combinations between PSU's and PDP's no or almost 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 the SW feedback loop OFF and align both the Vs and Va as described in the Service manual.
- Page 25 Chapter 09 page End of the repair method presentation For your reactions, questions or comments contact valere.deseranno@philips.com...