Question about Televison & Video
If there is no led on and no power at all , then the problem can be isolated to the power supply board and power cable.
Testing power cable is easy, you can read voltages, or continuity between plug and solder joints on power board.
The power board is not much different from what you had on old TVs, only on many LCDs there is no built in High voltage circuit, and the high voltage board is an inverter located underneath the display.
Only on few models the inverter is located on the same board as power supply, in that case you should recognise an high voltage circuit aside the low voltage power circuit on same board.
Usually LCD TV have separate inverter board , this makes testing much easier.
The fact that you are a TV repairer is really useful, as Evesham Technologies closed down, and now it is very difficult to find a service manual with part list or an original replacement power board. I am having troubles myself in finding Evesham parts. See : Evesham Technology goes into liquidation or Evesham 37" lcd faulty power supply board - help repair .
Also not having any power at all is a good sign, If you had a fault somewhere else than power board, then the TV would have stayed on protection mode, with the led blinking.
to fix the power board do the usual, check capacitors after allowing discharge, when they blow you can usually see they are bulged or leaking. Then have a general look to the board to spot cold solder joints, and then proceed on testing components, this is not a complex board, and if you know how to solder and use multimeter this should be an easy task.
Posted on Apr 12, 2009
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Posted on Jan 02, 2017
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