I have the STR DE835 from Sony. I have read similar issues from other owners of this receiver but I can't seem to get schematics or information on how to fix this. The center channel after a couple minutes of being on I hear a ticking sound and the center channel will cut out. A tap on the side of the receiver will generally restore the sound but it will happen about 4 to 5 times after the receiver is turned on. After those 4 to 5 occurances, it will generally have no issues until turned off and turned back on....then the issue arises again. I cleaned the inside with compressed air and a cleaner designed for such applications. I then hooked the unit up without the top on and by tapping on one of the pieces inside I can replicate the issue. I'm still not 100% sure if I'm tapping the culprit or merely creating a vibration that travel to the root of the issue.
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IF any other source plays fine with the RR speaker, and IF it only happens with the DVD player and IF you're using the 5.1 analog audio feeds to the STR, maybe the audio on that channel is **** from the player. You could prove that by temporarily swapping the RR input from the DVD to any other channel input and test it at a medium level.
If it stays with the DVD RR output, the player or the cable would be suspect. Swap in a different cable and make sure it is not routed uniquely near any sources of magnetic fields, motors, UV or track lights, etc.
If you're using digital input all that advice was a waste of time to create as there is nothing external to the chipset that could affect one input channel. Try a different digital input on the STR.
These models are known for this issue.
I've had my share in the shop here.
Disconnect all speakers,turn speakers off, try headphones only
If it still persists then there is either :
1. power supply capacitors gone bad or
2. The thermal fuse in the transformer is open.
A tech can very easily find out if the thermal fuse is open by checking the primary of the transformer
if the plastic is shrinking away from the power supply capacitors then they've gone bad
THIS UNIT HAS BAD SOLDER CONNECTIONS ON REGULATOR TRANSISTORS,REMOVE BOTTOM AND YOU WILL SEE THE BAD CONNECTIONS.ALSO BE SURE TO RE-TIGHTEN ALL CHASSIC GRD SCREWS AS THIS WILL ALSO CAUSE THE SAME PROBLEM.
Theres a couple of problems you may have. 1 bad solder connections,you can remove bottom plate and look for bad connections and 2 you may have shorted transistors, however if the protect relay comes on its probly bad connections.