Question about Sony STR-DE545 Receiver

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Sony STR DE545 Rear Speaker Problems

Hi! I've been having the same problem as others have been posting with the rear speakers going out and, shortly after that started, the unit periodically goes into "protect" mode. Turning the unit off and then back on seems to solve that for now. It all started after I moved the amp into a cold garage for about 3 days during a remodel, so it's likely that the temperature change affected the connections. I opened the case, straightened some transistors, and separated some things that I thought probably shouldn't be touching, and they came back on. However, the "solution" was short-lived. Also, the unit has also always produced a little hiss. I'm interested in trying the solution that worked for you, but I'm a novice at this. With that said, can you provide a little more instruction on how to go about it, or is it probably better just to bring it to a repair shop and let them try? Thanks in advance!

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The symptoms seems very likely that the solders on the PCB have cracked. These are the solder on the contact points with the "Blue Relays". Removing the various small boards and pulling out the main board is relatively easy. But to solder, you need the soldering gear and skills. If not done carefully, the whole board can be ruined. Taking it to a small repair shop and getting it soldered will be a better option.

Posted on Jan 10, 2009


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It senses an error or problem and shuts down. Try disconnecting all the cables and wires attached to it. Try it again. If it still shows protect message, it is an internal fault and requires a repair shop. If it clears up, then the problem may be a shorted speaker wire. Correct the short when reconnecting the speakers.

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I can't point you toward any specific "most likely" cause, but the bad soldering is something you can check by eye. Any other cause is probably going to require service by a technician who has the test equipment and service information to do more in-depth troubleshooting.

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