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Panasonic Viera TH-32A400G, Technical Manual

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Panasonic Viera TH-32A400G Technical Manual Download Page 7

SOS 1 blink

Q7801,7803

(IC7800)

Shorted

OK

< symptom >

Troubleshoot of Power On Problem (2/2)

Check short circuit of 
Q7801,7803

Voltage Check of VLED
Just before shutdown
(rise up from 38V to 71V)

IC7800 

Keep 0V

Rise up
(Not 0V)

Voltage Check of PWM
Signal input (pin4) of C7800
Just before shutdown

IC8001

OK 
(71V)

NG
(38V or lower)

LCD Panel

7

Summary of Contents for Viera TH-32A400G

Page 1: ... 2014 Unauthorized copying and distribution is a violation of law c Hints for Board Repair 32inch 1 board model Order No ITD1412904GE Model No Ver 1 0 TH 32A400G K T X V TH 32A405D TH 32A408K TH 32A409K TH 32A410D G K M X V 1 ...

Page 2: ...al Video Processor Resize MIX I P conv Pixel conv AI Gamma OSD AMP IC4900 V Y Pb Pr A12 Demod SPI ROM IC8901 A10 USB HDMI Audio I F Signal Flow TNP4G573 Component Video A21 LED Remote K Board DEMOD IC6750 Antenna EEPROM IC8902 IF 2 ...

Page 3: ...e defective How to enter While pressing volume button of the TV unit press option button of the remote control 3 times within 2 seconds How to exit Disconnect AC plug A IC8001 RTK2644 Resize IP conv LCD Panel LCD Panel Module T CON Test Pattern The test pattern is created by the circuit in LCD Panel Module T CON board No Yes Is the picture of all Input Source NG Check by LCD Panel Test Mode Check ...

Page 4: ...PWM Q7803 9 10 8 Panel PWM Bright Dark Lighting Period OFF 0V D7102 Rectifier 14 BL SOS 1 blink SUB3 3V Power Supply Distribution 1 2 TNP4G573 L7502 D7317 C7513 L O G I C 4 CF7101 F7101 OFF STB 38V ON 71V 1st 2nd 3rd 6th 7th 13th 14th 15th 2nd 1 3 5 8 D7800 C7817 38V IC7301 automatically starts working after AC plug in always working from to IC7800 starts working after input Vcc and BL ON Panel PW...

Page 5: ..._3 3V 3 3V IC8709 3 TNR1 8V SITU_1 8V 1 8V IC8705 3 DDR1 8V DDRV 1 8V IC8707 4 4 3 3 4 SPI IC8901 EEPROM IC8902 8 8 TNP4G573 STB3 3V STB_M3 3V V33AMAIN ETN_3V3 V33IO V33LVDS USB_Pwr IC5602 JK8601 USB 1 1 6 AMP IC4900 2 3 A21 To LCD Module T CON 27 30 12V IC8300 2 PNL12V L8300 PANEL12V_ON VCCK1 1V V11CORE 1 1V IC8700 L8700 2 EN Tr x2 Q8002 Tr KEY3 122 SUB ON EN 110 56 BL ON Panel PWM 64 STBRST 131 ...

Page 6: ...P16 3V line Power IC of Defective line Check short circuit of each power line SUB5V SUB3 3V DDR1 8V VCCK1 1V PNL12V TNR3 3V TNR1 8V F7101 CF7101 Q7301 IC7301 D7317 D7502 IC7503 IC7503 IC8708 check short circuit of STB power line OK NG Check input voltage of IC7503 16V and Check VLED voltage 38V at P2 3pin If all output voltages are OK IC8001 NG Check by power on sequence from to 1st 13th 3rd 4th 2...

Page 7: ...f Power On Problem 2 2 Check short circuit of Q7801 7803 Voltage Check of VLED Just before shutdown rise up from 38V to 71V IC7800 Keep 0V Rise up Not 0V Voltage Check of PWM Signal input pin4 of C7800 Just before shutdown IC8001 OK 71V NG 38V or lower LCD Panel 7 ...

Page 8: ...Parts Change Note 1 Add zener diode DZ2J068M0L to pad of C8759 no use POLARITY MARKING 8 ...

Page 9: ...2 Add surge absorber D4EDY5R5A038 to pad of C8782 no use 3 Add surge absorber D4EDY5R5A038 to pad of C8707 no use 9 ...

Page 10: ... CF7101 Q7301 D7507 D7102 D7502 IC7503 STB5V IC7800 Q7801 Q7803 Q7510 D7800 P2 A10 IC8708 STB3 3V L8700 Left side VCCJ1 1V L8702 Left side SUB5V L8300 Left side PNL12V A21 IC8707 DDR1 8V IC8711 SUB3 3V IC8705 TNR1 8V IC8709 TNR3 3V 10 ...

Page 11: ...Revision History Version Issued Revised date Revised content Ver 1 0 11 Dec 2014 First version 11 ...

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