APPLICABLE TO PANASONIC: TH-42PX75U_TH-50PX75U_TH-42PX77U_TH-50PX77U PLASMA.
This fault is somewhat complicated to detect. Start with a quick troubleshoot.
- Trouble Mode : 5V SOS.
- Defective boards to suspect : D, P, C, SC, SS Boards or Panel. Make confirm that the panel has no fault. To check it:
- Disconnect CN P12, of Power Supply board. Measure the resistance of Pin-1 of the lead cable to Ground. Is there a short to ground? Defective Panel.
- No short to ground? Proceed more checks as follows.
- Disconnect CN SC20 on SC board. Turn ON the unit. Does the Power LED stays ON? If yes; fault is with SC board.
- If NO; Connect CN SC20 back, and disconnect CN SS23 on the SS board. Turn the unit ON. Does the Power LED stays ON? If yes; SS board is faulty.
- If NO; reconnect SS23 back into, and disconnect CN D31 & D32 on the 'D' board. Check if pin 5 of CN P25 shorted to ground? If yes, disconnect CN P25 of the socket. Is pin 5 of the socket P25 shorted to ground? If yes; 'P' board is faulty. If No; 'D' Board is faulty.
- If No connect D31 and leave D32 disconnected. Is pin 5 of CN P25 shorted to Ground? If yes; Disconnect CB1-CB4. Is pin 5 of CN P25 shorted to Ground? If yes; faulty C1 board. If no, Panel is defective.
- Disconnect D31. Connect D32. Is pin 5 CN P25 shorted to Ground? If No; 'P' board is defective.
- If yes; Disconnect CB5-CB8. Is pin 5 of CN P25 shorted to Ground? If yes; C2 board is defective.
- If No; Panel is defective.
D-BOARD
P-BOARD
C-BOARD
C1&C2BOARDS
SC-BOARD
SS-BOARD
