Ok....the FIRST thing you should do is this.
Unplug your TV's power cord from the wall and give it 5 minutes so the TV's computer RESETS.
You could simply have a locked up micro.
Plug it back in. see if the TV turns on, or at least the light on the front of the TV lights up.
If it does light up, and if you can turn it on and off....your micro is ok.
If you turn the TV on....and the TV turns itself off, and blinks....count the blinks between the 3 second pauses.
That isolates your problem.
Then I can look at what is happening to your TV set, and give you an estimate of repair.
I just hope your TV just needs the 5 minute unplug to get it started again.
zI have unluhhed the tv and left it off overnight. There are no lights on the front panel. No sounds, just a dead tv. Wghat's my best and worst case scenarious as far as cost.
Since you don't get any lights lighting up on your TV --
1] Your power supply may be totally dead
2] Your main board may not be turning on the TV set at all.
The power supply board is $100 to $110 for that.
The Main board is $170 to $180.
It will be one or the other.
Labor cost I would expect to be $150.
Altogether, expect $250 to $260 total if the power supply is bad, or $320 to $330 if the main board has failed.
Contact Panasonic's Customer Relations department. If there's an issue with their TV set, it's their responsibility to take care of their customers. That's their job, to assist customers with out of warranty repairs.
You should tell them you had it serviced a couple years back too.