Panasonic TNPA4785 board

[Moreno83]

Hey guys ,

Im repairing a Panasonic TX-P42U10E wich has a shorted buffer board.
I ordered 1 from flattvparts but that 1 was also short.

Ordered another 1 from ebay but it was defective on arrival , both buffer boards are missing the white connectors and 1 pad is gone .
Attached is not the actual board but the arrow shows the pad thats gone.
Can i still fix this board or do i need a new one? I cant see where the traces are leading to.

Can it be that the SC board shorts a new buffer board on first start up?

[ljintexas]

Re: Panasonic TNPA4785 board

The connectors are par of the Sc board. it is indeed possible if you have a bad buffer that it damaged the sc.

[Moreno83]

Re: Panasonic TNPA4785 board

No the SC board is fine. When i disconnect the buffer boards and use the jumper on the SC board the TV stays on.

Problem is that on MY buffer board the white connectors are gone. On the picture you see the white connector thats gone on my board. I have a connector wich i can use but one pad is missing. Im talking about the pad on the picture with the red arrow......

I need to know where the pad is going to so i can make jumper...... :/

[tw2005]

Re: Panasonic TNPA4785 board

No the SC board is fine. When i disconnect the buffer boards and use the jumper on the SC board the TV stays on.

Problem is that on MY buffer board the white connectors are gone. On the picture you see the white connector thats gone on my board. I have a connector wich i can use but one pad is missing. Im talking about the pad on the picture with the red arrow......

I need to know where the pad is going to so i can make jumper...... :/

you're in luck, pin 7 is not used

I would not recommend FlatTv, unreliable. Purchased sc/sd/su all shorted that's a couple of years ago

[Moreno83]

Re: Panasonic TNPA4785 board

Hmm ok , lucky me but this is strange! Tested the board before i installed it and it had no shorts. Installed the board , turned on tv ....a small flash and 7 blinks again.
Took the buffer boards out , measured again and again SAME CHIPS are shorted......

What am i doing wrong?

[tw2005]

Re: Panasonic TNPA4785 board

Have you seen this TV work? Could panel be shorted / cracked? Don't know to be honest?

[Moreno83]

Re: Panasonic TNPA4785 board

No i bought it with a 7 blink error! Panel looks visually ok , not damaged in any way.

[tw2005]

Re: Panasonic TNPA4785 board

Honestly, don't know. only suggestion would be run it with just the sd with jumper in place. remove the Su or fully disconnect including the 2 Vfg bolts and run it to see if bottom half works.
I've never done it, guide suggests it, not sure if it will do damage so at your risk.

may help prove sd and sc ok but still if the panel has internally failed in the upper part then this probably won't prove that part.

never been faced with this one except a tottlly shorted samsung panel that killed 2 buffers and made buzzing noises which I concluded shorted panel.

[Moreno83]

Re: Panasonic TNPA4785 board

Thx! I will give it a try and let you know.

[FlatTVParts.co.uk]

Re: Panasonic TNPA4785 board

I would not recommend FlatTv, unreliable. Purchased sc/sd/su all shorted that's a couple of years ago

We do make mistakes and for that we can only apologise, but it doesn't mean that we are unreliable.

I remember your order and I again apologise for the problems you had.

Tom
Director
FlatTVParts

[Moreno83]

Re: Panasonic TNPA4785 board

I purchased a mainboard last week from Flattvparts.co.uk and it was working perfectly although i was curious if it would work or not. I think the only boards that are questionable are bufferboards.