Question about Sony STR-DE635 Receiver

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Receiver goes into protector mode

My receiver (SONY STR-DE635) is in constant protector mode, even with nothing connected.
Could it be the power supply?

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  • 492 Answers

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

Posted on Jan 04, 2009

  • juan rodriguez Apr 22, 2011

    which capacitor the big ones in the power supply?

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WHEN TO TURN SONY STR-DE635 ON AND NO AUDIO OUPUT


Maybe the Preamp driver IC, looks like a car audio ic on the main board.
Often with age the heat generated by the ic will destroy the solder.Makes it look like lava rock in bar-b-que grill. Which
causes an open circuit in the preamp driver to the audio power
stage.
Simply resolder them, most often restores audio. Should have
a bottom removalble cover.
If not, a fuse normally blows if ic or channel is shorted. Check if
display will say Power off, Protect, etc. That means there is a problem with a channel.
Most Sony receivers use darlington transistors, they short easily !!
I am an old school component level service tech, I think I do have a schematic for this model and many others.

Jan 12, 2012 | Sony STR-DE635 Receiver

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I have a Sony STR-SE591 Home Theater receiver. As soon as I turn it on, it goes in to "PROTECTOR" mode. Nothing is hooked up to the amp at all, besides the power cable of course. I am no expert at all when...


could have a blown channel or a bad connection, these where often riddled with connection problems,
get a powerfull magnifier and look for connections that aren't solid and redo them. also check the outputs first for shorts if none amp is probibly ok.

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1 Answer

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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

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You've blown it. It recognizes a potentally harmful situation and goes into protect mode.

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With this receiver it is cheaper to buy a new one. But instead of throwing it out I recommend that you list it for sell as is for parts. Keep the landfill free or ewaste and all. Sorry to bear the bad news.

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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=)

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1 Answer

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sorry my expertise is in appliances, youl need to repost you question to another tech

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1 Answer

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

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1 Answer

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I suspect intermittent 31V supply, filament supply or bad connections on fluorescent display.
Check Q801 31V reg , R802, zener on base of Q801 located on DC board. Inspect all boards for bad solder joints, reflow and tighten pcb grounding screws.

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