You need to reset it unplug hold power button down and plug it back in
If you need further help, I’m available over the phone at https://www.6ya.com/expert/omar_c87dacfef1e87642
SOURCE: TC-P50S30 Plasma HDTV won't come on blinks 7 times
That is a error code and depending (Panasonic?) on model means either power board or another issue---the error codes can sometimes be misleading or too vague to pinpoint to one board.
Note: these (all brands) sets only sell boards, no individual parts.
Not knowing your skill level you may be able to tell me that, the first thing would be to examine the power board for damage or puffed up filter caps---let me know if questions here etc.
Try this site. https://www.youtube.com/watch?v=iHBIiRxhe0w
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