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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From page 46 (Troubleshooting)-

No sound or only a very low-level sound is heard from the rear speakers.

>>> Make sure the sound field function is on (press SOUND FIELD - MODE).

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PROTECT MESSAGE


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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Yes I have a problem with my sony str de 525 receiver its stuck on Protecter every time i turn in on it flashes protecter and i cant get it to stop what do i do


Disconnect the speaker wires from the rear panel, turn the volume down, and see if the receiver still goes into protect when you turn it on. If it doesn't, you need to check your speakers and wiring. You may have a speaker that's gone bad, or a wire that's shorted. Likely causes are too much insulation removed when you stripped the ends and now they are touching, the wire's been pierced by a mounting nail or staple, or it's been damaged somehow.

If the receiver still goes into protection with no speaker load, it's the receiver at fault. I have seen this problem caused by bad solder connections on several areas, bad components in the power supply, and trouble in the amplifier section.

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.

Good luck, and thanks for using Fixya!

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Sony str-de545 protect mode?


Disconnect all speaker wires at the receiver and turn the unit back on. If it stays on, your receiver is ok and you need to reconnect speakers one by one and test until you find the one causing the "protection" once you find this, disconnect the wire at the speaker and test again. make sure the + and - wires do not touch! If the receiver stays on, use a multimeter to test the speaker for a short with resistance check. If your not sure how to do this, any home audio shop will test it for free and while you wait. If speaker wires are disconnected and it still shuts down, it needs to be serviced. Hope this helps

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