Display flashes a couple of times then goes black.

Device: Panasonic TC-50EM5, September 2012

Issue:

The display flashes a couple of times then the screen goes blank. When shining a flashlight on the screen, I don’t see anything, just black.

Not sure about the red flash codes. I tried to count them but lost track after about 30. It seems like it’s just flashes every 4 seconds.

I took the back cover off and don’t see any blown capacitors or anything leaking. No visual damage.

Anything else I can check? Thank you in advance.