Reseat all audio connectors sometimes they get dirty. Do you have surge protection? Do any other audio functions work? Clean your remote change the batteries the mute may be stuck. I vote for the battries being weak and the remote will not clearly send all signals.
Most of the time the problem is power because the older units switched the audio with relays as you stated. I don't know if you have a suppressor on this unit but, if it got hit by a spike the problem is most likely a control circuit. The transistor in question may be the key, Look at the circuit board and look for a burned trace (most have traces on both sides) and with no power to the unit you may be able to trace it with an ohm meter (rember that the capacitors could still have a charge so check with the voltage first so as not to burn up your ohm meter. If you recognize The bridge start there and look for small blown fuses( sometimes low ohm resistors). You may have to test live just stay in the secondary side of the transformer using your volt meter and do not switch to ohms as this will blow up your ohm circuit in your meter. Finally you can toggle the relays manually by taking the cover off and using a pencil eraser while the unit is on with all the cables connected.
Good luck this is pretty deep and I have fixed this problem before by repacing the transistor that controlled the relay that I needed. I hope this helped and just to let you know thw score is not always if this fixed the problem but you can give a good rating for teaching in depth trouble shooting skills.
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Thanks for your reply Txtooltime.
Yes, I tried all audio source including tuner and clean all audio connector. To over rule problem in remote I try used all the buttons on unit itself. but still no sound. I even opened its cover s checked relay. I see power relay is clicking fine and working as it suppose to to turn the unit On and OFF. but all the other audio relay seems dead. Another thing I noticed that one of the transistor very close to Power Transformer is getting very hot, I am not sure if its normal or it got burnt. I have this unit for last 6-7 years and never had any problem. But I always noticed when I turn the unit ON or OFF immediate after low clicking noise of power relay, there was a loud noise of some other relays which I guess connects audio circuits and I am not hearing that loud noise since this stopped working. Any suggestion, where to look for and what components could go bad here.
I am comfortable even doing soldering etc to replace any component if I have to. I used to do lots of hobbies project in Electronics long time ago, but not any more, since I jump into IT. But I am quit comfortable that I would be to handle this, if I get right pointer where to look for and what could have gone wrong?
Thanks a lot
Akhil
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