The reason is feasible to be produced by the IC #9 NJM2103D malfunction. This IC is placed on the Standby board, in the entrance of AC power. The other day I got the schematic and I realised the pin 1 and 8 had around 0 Volts instead 5V, the reference needed on the power switch button.
Failure of the the power source. To see if it's fixable the receiver will have to be opened and the power board tested . This job requires at least a basic experience in electronics - if you don't posses it all you can do is to look for a burned fuse or damaged capacitors. For them follow this
http://www.youtube.com/watch?v=YCSNWi3UHf4
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