Sony STR-DE635 Receiver-no sound at all

Might be a bad speaker relay.

Check that the mute is not on.If a headphone is plugged into the receiver the speakers will be muted.Verify the the output selector is set to the correct source.Here is a simple check.Select a strong FM radio station.Plug in a headphone.If you are receiving an audio thru the headset.Then disconnect the headset and see if the audio is transmitted to the speakers.If you still have no speaker sound check to see if the speakers have fuses which may be blown.I would try another set of speakers to determine if it's the amplifer or the speakers.The amplifer has fuses as well. Wiilbe inside if not at the rear

Headphone jack is an output not input jack. Your going to need a cord to go from your headphone jack(output) of your phone to audio input on your receiver. The cord has a mini stereo plug to the phone and RCA plugs of left and right to your receiver auxiliary input. Good luck..

Have you checked the rails to ground for shorts. Get hold of a variac as it does make things a lot easier.

Sound like you might have some shorted output devices.

Hope this helps
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There's a button that turns the speakers OFF right above the headphone jack.

Get the manual: retrevo.com

first turn the actual volume up on that channel on the reciver then make sure your speaker wires in the rear are using the same lenght each

Nope, power supply it would not even power up.  The capacitors are fried

Many amplifiers heaphone socket cuts the speakers as internally the headphone jack is a switch it self

Maybe, it worked for me. my rear speakers workt ramdomly, often not. so i re solder the relay for the rear speakers, now it works fine everytime, a hole movie and some random on and offs, it can't do any harme to try=)

Turn your volume down,press the tape monitor button.then turn up?