Had a fair bit of experience with these
Normally the Electrolytic capacitors in the SMPS dry out.
and when you power up the tv after a while the cap gives up dropping a supply rail causing supply to shutdown turning off tv.
2 ways of fixing this:
1. Take to Local Service Agent or electronics repair shop and explain that its the capacitors (they won't think your dumb and charge you heaps!)
2. If your feeling confident power down and disconnect from wall power..
leave for a hour or so to let the main capacitors discharge.
next take off the back cover and have a look for the SMPS PCB
it should be dead centre on the back of the screen and have large heatsinks onboard..(Aluminium fin looking things).
now scan the board for any faulty capacitors. and good capacitor looks like:
A Faulty Capacitor looks like but not limited to:
You'll notice that the good capacitors are flat topped and clean
any bad capacitors will have bluged tops or there insides hanging out!
then all you need to do is de-solder and replace with new capacitors.
whole job should take about 4 hours for a beginner and about $10 worth of capacitors
hope this helps,ben
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