Chosen Solution

Hi there.. I have this 2013 plasma model, which was working fine while hung on the wall for years, but suddenly started to power off (completely, no red or green LEDs) when you take it out of standby (then eventually works fine). So scenario is like: TV is in standby (red solid LED) and everything is fine. You turn it on via remote.. it goes through normal green LED startup process.. TV comes on and works. Then within a minute goes completely off (no LEDs at all) If you now leave it for a bit, it will actually power on by itself and the cycle will repeat. If you bang the top of the TV hard enough, it will actually turn on as well (curious) Then if it manages to stay on for long enough (warm up enough?) it will then work perfectly for many hours until you turn it off again (and it cools down?), and the cycle begins. I have also witnessed it power off while it’s in standby.. so I guess it doesn’t require the whole thing to be booted up to happen. I believe this is one of the last Plasma models Panasonic ever made. From looking from the outside at the back, it does not appear to have any fans (but lots of vent holes), and I don’t see any blink codes (it just powers completely off instead) I took it off the wall, and I have tried with another power cable and nothing else plugged in (just looked at menus) and that did not help. I’m considering taking the back off it, as it seemed like maybe this could be a trivial problem (given banging the top of the TV seems to do something). I’ve searched around on the web and can’t find anyone talking about this sort of scenario, so I’m curious if anyone has seem something like this, and if anyone has any suggestions for things I could look at. I’m guessing I should be concentrating on the power board area, but you never know with these things. I’m loathe to go out and buy a new TV as I still like this one, and it works perfectly once you get past the warm up phase ! Thanks in advance!

Hi @philsw , The power board is probably the best place to start looking. Check for any heat stressed components or heat (burnt looking) marks on the board and for blown, bulging or leaking capacitors. Also remove the board and check the solder side for any dry joint solder connections. if you spot something or even if you’re not quite sure, post some images of the board. Here’s how to do this on ifixit Adding images to an existing question