The tv screem on my ilo 32'' HD tv when black and i have no sound. it's a flat screem
The main power supply will be the first place to check. You should have at least the standby 5vdc, which is used for the main board, when the power switch is activated, the main board will send out the signal to turn on the main power supply sections to power up the rest of the set. Look for simple thing like blown fuse or bad capacitors. Learn about what bad capacitors can do.
http://en.wikipedia.org/wiki/Capacitor_plague
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