I suspected it might have been fake IGBTs, they looked a bit suspect. When looking for different ones, I found that a replacement board was not that much more expensive (less than €30 on Ali), so I went for that. The first one was a DOA (got my money back), so I ordered another one that worked like a charm. I was quite surprised how many of these boards are offered there, there must have been at least 30 different sellers....

Oh yeah, I also tightened all screws and reflowed the solder on the screw holes on the top and bottom.

My parents' Panasonic P42S30 died recently, and they asked me to have a look at it. I was able to identify the SN-board as the culprit, as it was shorted. After removing Q401, Q402, Q421 and Q422 the short was gone, so I replaced these components and that got the TV working again. However, when testing the tv a bit, I noticed quite bad pinkish sparkles on some colors. For instance the greyish bar on this forum seems to trigger it quite badly. I made a fullscreen test picture with only that color, with the below result.
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Hi all, I joined because I'm having some issues with a plasma tv repair.