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Repair guides and support for Panasonic's Viera line of televisions.

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Panasonic Viera TX-P42S21B - 7 Red flashes

My Panasonic Viera TX-P42S21B 42" 1080p HD Plasma developed a fault a few days ago.

It looks like it's going to come on, makes that click sound but then goes off. Doesn't turn on via remote.

So, obviously it's likely one or more of the components/boards. I don’t see any results for my model or a service manual anywhere, but I’ve briefly looked into it with similar models and apparently it is the SC and or SM board(s.)

How accurate are the fault blink codes? I don’t see any glaringly obvious damage on the SC/SM boards but the power supply has some markings. See images. Could the PSU be the original issue, causing this instantly happen again if I replace the SC/SM? How do I correctly diagnose everything?


I don’t have a multimeter to hand and I’m a novice anyway. But I have ordered one for Sat. I will be looking more into it over the week until it arrives but any info/help would be greatly appreciated.


Video of fault:

https://youtu.be/cSnk7HWk38E

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@paft yes looks like something got to hot around the transformer. Take a picture of the power board from the bottom side as well. the blink codes are usually correct but can always originate somewhere else then the board listed with the code. Yours is kind of tricky and you would have to measure the output of your power board as well. Without a meter and looking at the Power board, I would change that first and then re-evaluate. Once you have a meter we can at least try to see if the issue is your Power supply.

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Thanks for the reply.

-How do I correctly test the SC board?

-I get a continuous beep on the SM board on several of the SM6 ribbon pins. They look like they go to the fourth IC(?) chip from the left.

-I get a continuous beep on D207 on the power supply where the black marks are. I don't see anything obvious underneath. (But it's rather grey in England and getting dark. I had to use flash. I'll take some again tomorrow)

Attached are images of the bottom of the PSU and the SM or: https://imgur.com/a/vI5Geh9

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Well, it was definitely the SM board.

Sadly part of the right side of the screen is blank/missing. now. Some images attached. (Ignore the faded look the the 'Input Selection' Window. The photo was taken just as the box was about to disappear.)

I have already tested a replacement C1 buffer board as it was cheap. No joy. Mainboard or panel fault?

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