Question about Televison & Video
Rather than the logic board (that is also possible), your kid may have damaged the power supply, by turning on and off power button.
If after the fault the TV went in standby and does not wake up, then the TV has gone on protect mode after detecting a fault, probably caused by repeated switch on and off.
When this happens higher voltages are shut down to prevent further damage. The PSU will keep a low voltage +5V line to hold the TV in standby.
Try first leaving the TV power cord unplugged for some times, let say one hour or so.
Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.
If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.
The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.
1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.
2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.
If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
Parts that may have blown after turning on and off are PSU (fault on higher voltages), logic board, sustain boards or buffer board.
The plasma TV must be tested to find out.
If the TV is less than one year old, then it is still under warranty, in that case contact the manufacturer ringing the number on the user manual
If you want to repair at your own expenses, just locate any good qualified repairer.
Posted on Nov 20, 2009
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Posted on Jan 02, 2017
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