Pansonic plasma TV diagnosis & repair

[mostachio]

I am helping a friend fix his Panasonic TH-42PV8AZ plasma tv. I have basic electronic knowledge but have a multimeter, soldering iron, heat gun etc.

Problem Symptoms:
When the TV is turned on it flashes the red light 12 times repetitively.

According to panasonic blick codes this suggests:
Sound SOS H Board

I've done some research which suggests it could be anything from:
A short to ground
bad speakers
Bad logic board (TNPH0713)
Bad power board (LSEP1260 OR LSJB1260)


I've tried looking for physical signs of burnt components / bad capacitors,
checked fuses / diodes / connectors, looking for a pinout for the power board to test outputs however unable to find one.

Can anyone please offer some help with diagnosing which board/component is at fault so that I can either order a replacement part or possibly fix it? or provide pinouts diagram etc for the power board etc so i can test these.

Thanks!!!

[trebo]

Re: Pansonic plasma TV diagnosis & repair

for best help ask moderator to move you to the TV section
good luck

[mostachio]

Re: Pansonic plasma TV diagnosis & repair

My bad, thank you, could a moderator please move this to the TV section?

[tw2005]

Re: Pansonic plasma TV diagnosis & repair

http://elektrotanya.com/?q=showresul...oria=&kat2=all

Sound SOS, checkpoints are P and A boards.

"12 Blinks SOS: On the A board, transistor Q2301 monitors the Sound 15V line and the operation of the audio power amplifier IC2301. If the audio output circuit, IC2301, or the 15V lines develops a short to ground, transistor Q2301 goes into conduction and applies a high to pin 70 of the MPU, IC1100, triggering a SOS condition. The power LED blinks 12 times.
A short circuit in the sound P15V normally shuts the TV down and the power LED blinks 2 times. It can also cause the TV to shutdown and make the power LED blink 12 times."

[mostachio]

Re: Pansonic plasma TV diagnosis & repair

Thanks, appreciate it. I will study the service manual attempt to diagnose which... Any further help would be great, though i'm guessing to test 15v line and ic2301, and if both ok assume audio output circuit and replace A board?

[c_hegge]

Re: Pansonic plasma TV diagnosis & repair

Moved to TV troubleshooting