STR-DE698 Receiver Frequently Turns Itself Off

All the STR-DE series have a common problem with the ground screws on the main CBA being too loose and not properly grounding the board. Use a Philips screwdriver to tighten all of them real good, and see if the problem goes away.

Thanks for the info. Where would the ground screws be located? I do not have a schematic. Should I just open it up and tighten all the phillips screws?

Thanks, Dan

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Yea, if I remember they are copper coated - several are on the perimiter of the board, but some are centralized on the board.

Thanks, Dan

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I checked all of them.. None were loose, but I tightened them anyway. The receiver still shuts off. No error message or anything. Any other ideas?

The above advice applies to older (Dolby surround types, for example) models only. Sony's haven't had this problem for going on 20 years. Modern models more often have problems with driver IC's - STK350-230 and the like. Could also be bad solder connections.

Mark Z.

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I just wanted to follow up on this thread in case anyone else has a similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still shutting itself off after about a half hour of use. I removed the smaller PCB located right where the power comes in, and noticed the ground screw hole had become corroded/filled with gunk. I cleaned it out, and added a wire ground from the board to the chassis, plugged everything in, and it has been running for about 12 hours now with no problems. It appears to have been a grounding problem after all. Curcuit: Thanks for suggesting I check the ground screws! It is hard to believe Sony relies on this method of grounding as opposed to a direct connection to the chassis (I've always considered Sony a step up from Technics, Sharp, etc).

Thanks, Dan

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the

goes

I just wanted to follow up on this thread in case anyone else has a similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still shutting itself off after about a half hour of use. I removed the smaller PCB located right where the power comes in, and noticed the ground screw hole had become corroded/filled with gunk. I cleaned it out, and added a wire ground from the board to the chassis, plugged everything in, and it has been running for about 12 hours now with no problems. It appears to have been a grounding problem after all. Curcuit: Thanks for suggesting I check the ground screws! It is hard to believe Sony relies on this method of grounding as opposed to a direct connection to the chassis (I've always considered Sony a step up from Technics, Sharp, etc).

Thanks, Dan

what was the gunk from ? nearby electrolytic that needs changing?

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It is scary that a simple ground connection is made thru just one screw and not a wire. Usually, if it is just a screw, the screw presses the board against a good grounded piece of metal, and does not rely on the actual screw to do the grounding. Anything that is cheaper seems to be the way that everyone, including "reputable" manufacturers is going.

I just wanted to follow up on this thread in case anyone else has a similar problem with Sony STR series receivers.

I had tightened all of the ground screws but the unit was still shutting itself off after about a half hour of use. I removed the smaller PCB located right where the power comes in, and noticed the ground screw hole had become corroded/filled with gunk. I cleaned it out, and added a wire ground from the board to the chassis, plugged everything in, and it has been running for about 12 hours now with no problems. It appears to have been a grounding problem after all. Curcuit: Thanks for suggesting I check the ground screws! It is hard to believe Sony relies on this method of grounding as opposed to a direct connection to the chassis (I've always considered Sony a step up from Technics, Sharp, etc).

Thanks, Dan

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Sony is a four letter word.

I think it's all about assembly time: screws are cheaper than soldering.

After all, it only has to work for 12 months (or whatever the warranty is).

Pessimistically, Dave