Question about Sony STR-DE635 Receiver

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Led display goes dead

My sony str-de635 led display goes dead after being on for several hours. Is there any fix for this as I am an electronics technician.   Thanks

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Re: led display goes dead

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.

Posted on Nov 05, 2007

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I have a sony str-de635 receiver I need a fuse behind the volume control. I can't find one, or what it's called?

There is no fuse behind the volume control. I can't make out what that is in your photo. It looks like a piece of broken circuit board. Can you elaborate?

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Where do i find an A/B speaker switch

It's probably not the switch. These models have a common problem with the solder connections between the switch pcb and display pcb going bad. You need to resolder these connections, and your problem should be solved.

Jun 17, 2013 | Sony STR-DE635 Receiver

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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
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

1 Answer

Have a Sony STR-DE635 that keeps blowing the 2 8 amp fuses in the power supply. disconnected all speakers and powered up with same result. Checked bridge rectifier and (2) 10000 uf caps all are good

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
Thanks for using FixYa

Aug 18, 2010 | Sony STR-DE835 Receiver

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Sony STR-DE635, Sound from left surround speaker but not right

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

May 18, 2009 | Sony STR-DE635 Receiver

1 Answer

Receiver goes into protector mode

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

Jan 04, 2009 | Sony STR-DE635 Receiver

2 Answers

Receiver clicks and rear speakers stop working

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=)

Dec 09, 2008 | Sony STR-DE635 Receiver

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Sony str-de635

It may need soldering of the display, could also be a bad resistor or transistor in the power supply.

Dec 08, 2008 | Sony STR-DE845 Receiver

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Sony STR-DE635 Receiver-no sound at all

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

Mar 21, 2008 | Sony STR-DE635 Receiver

1 Answer

Sony STR-DE635 Receiver-no sound at all

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

Mar 20, 2008 | Sony STR-DE635 Receiver

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