TV will no longer turn on

Your power supply or interface circuit needs servicing.

hi i have the same tv same model number. and it happend the same exact thing. in stead of unpluging it i use a litttle xmas device that has a remote to turn ov is 3 years old, when you getn off. . my t sound, just let it run for like 10 minutes and then shut it off with remote and back on in like 5 seconds. try twice and the picture will come on.

the problem in this tv is the power supply board OR the standby board.

i call a guy locally and he charged me 75 dollars for the diagnosis and them after repair it came to a grand total of 180 dollars. .
it was the power supply. this model does not have a cooling system so it overheats and burns power supply.
in some other places the repair will be almost 400 dollars

look at google or craislist for local service places they are cheaper. and they come to your house so you know is safe.