Question about Sony STR-DA90ESG

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Shorted out during a storm; fuses fine; trying to determine problem

I'm trying to repair the same model receiver. it shorted out during a storm and no surge protector was used. while i am not experienced as the rest of you, i would like to determine the cause of the problem. i took the top off and there are three circuit boards relating to power; the first has 3 fuses, the 2nd two fuses and the 3rd i believe 2. All of the fuses are fine. what else could have shorted out -- the output transistors? i don't know what they look like or how to test them. what should i look for?

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  • Neil T Flanders
    Neil T Flanders Jun 02, 2008

    all the fuses appear to be fine. i dont know what exactly has shorted out; i just know that it has not worked since a storm when lightning struck the house. now it does not turn on. i took the top off and looked inside. i did not see any visible damage. all the fuses look to be ok. most are 125v and 2 or 3 are 250v.

    thankyou for replying



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Hoping you could give me a bit more information regarding your amp. Had any of the fuses blown? Just wondering what you mean by the amp is shorted out. Does it blow fuses or is it tripping an earth leakage circuit breaker?

Awaiting your advice


Posted on Jun 02, 2008

  • Graeme Ross
    Graeme Ross Jun 03, 2008

    Hi again, have you tried plugging it in again after it has been unplugged for a while, and see if it turns on after time to reset? Sometimes, power surges can affect the program counter to the CPU then scrambled, the unit may lock up.

    If still no go, from there I would check the standby power supply for correct operation. Normally a separate 12 volt transformer with regulator attached. Check the regulator output to confirm. If thats ok, get back to me here.:)





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