PANASONIC - TH-42PX75U - TH-5-PX75U [12 BLINKS OF LED AT POWER ON]

PANASONIC - TH-42PX75U_TH-50PX75U_TH-42PX77U_ TH-50PX77U


Trouble Mode:  Sound SOS.
Defect:  Speakers or A board.


To avoid  potential shock from the Vsus voltage, discharge the connectors SC2 or SS11 before reconnecting them into their sockets.
Remove the jumper at CN SS34 and install it across pin number  8 & 10 of connector P12.
The reference number on the Sustain board data connector is different in some of the models. 

1. Disconnect the connectors A5, A6 & A7 on the 'P' board.
2. Does the TV turn On by itself with a white screen?
3. If yes; Reconnect A5, A6 & A7  and disconnect the speakers.  Turn the power On.  Does the TV stay on?
4. If yes; check the speakers.
5. If No; A board is defective.  
6. follow steps 1 to 3.
7. If No;Reconnect A5, A6 & A7. Disconnect CN SC2 & SC20 of the 'SC' board.
8. Does the power LED stay On?
9. If yes; SC board is fauty.
10. If No; disconnect CN SS11, SS12 & SS13 of 'SS' board. 
11. Does the power LED stay On?
12. If yes; 'SS' board is faulty.
13. If No; Check pins 1 & 2 of CN P25 output 15V before the unit switches down.
14. If there is voltage, D board is defective.
15. If there is no voltage, P board is defective.