After the unit complex fire alarm testing electrician turned off all the fusebox switches, the TV wouldn't restart despite trying all the usual power cables and TV switches then following the Viera XT50A series manual.

It was manufactured May 2012, Serial #: TA2330124

Matthew, April 2014

Is the TV being plugged into a surge protector? (Check)
Is there power at wall socket? (Check)
If all these pass then it is internal (POWER SURGE)
The most obvious thing to do now is to check the TV's fuse. Not all of them can be easily replaced, and in many cases it requires the opening of the back of the TV - but You may get lucky.
If all fuses are good try unpluging the tv for 4 hours or overnite(How to do a hard reset). If this doesn't work then it is other parts in your tv that are no
good or helping stop your tv from coming on.
How many times do's the power light flah.Look up flashing codes for your tv(blinking code for your model number and make)
If your tv power light comes on and nothing happens then it is internal if it flashes all the time then it's more than likely thhe power board caps.

Panasonic blinking codes

1 blink STV 5v sense DG Board

2 blinks 15v SOS D Board

3 blinks 3.3v SOS D Board

4 blinks Power SOS P Board

5 blinks 5v SOS D Board

6 blinks Driver SOS 1 SU / SD / SC Boards(SC energy recovery circuit)

7 blinks Driver SOS 2 SU / SD / SS Boards (SC floating voltage area) tv for atleast 4 hours or overnite.


8 blinks Driver SOS 3 SS Board (SS energy recovery circuit)
9 blinks Panel Config. SOS
10 blinks Sub 5v SOS / Main 3v SOS DG BoardDTV 9v SOS / Tuner Power SOS
11 blinks Fan SOS PB Board
12 blinks Sound SOS H Board
13 blinks Communication error DG Boardwith IC8001

flyatyou66, April 2014