Power don't turn on

There is a problem for this receiver. When I turn on the power switch on receiver, stanby lamp shortly blinks once, but receiver is still off.
I searched forum site to fix this problem and common result was checking the protection circuit, mainly output transistor and the resistors, capacitors.
When I opened the receiver, I couldn't discriminate the protection circuit. But I can discriminate the elements such as transistor (BJT/MOSFET), resistor, capacitor and so on.
Which one is output transistor ?
Could you let me know which part is protection part ? Then I can check whether the circuit is shorted or not by myself using multimeter.
In addition, if any, could you give another cause for the problem ?
Because the warranty is over, I have to fix it. I don't want to pass it away.