yamaha rvx365

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i have a yamaha rvx365 home amp when I switch it on it switches off after a few seconds, however if I turn the amp upside down and switch it on it works fine. I have taken off the back to check gor loose connections, dust and broken speaker wire that could be shorting something somewhere, I have also removed broken wire from speaker inputs. This has been causing me headache for some time now!!!! please please please can someone help me with this

 

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i had the same issue with my RXV359 i think its time for a upgrade on the amp the RXV356 was a great little amp in its day newer amps have more to offer