Question about Sony STR-DE135 Receiver

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No sound out of left speaker

My sony str-de135 receiver will not produce sound out of the left speaker. I switched the speakers to troubleshoot and think that it is the left outputs on the receiver. Can anyone tell me how to fix this problem?

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Did the left channel work when u switched speakers, if so then the left speaker or wiring is a fault.if not then the output circuits on the amp are blown or the fuse is blown some amps have internal fuses in the output to protect the output transistors. unplug the power cord and take the cover off, look to see if u can find any fuses and check these for continuity u can hold these up to the light and u should see a fine filiment in one piece and not broken. these fuses sometimes blow just from age and use at high volume like a regular light bulb.If the fuse is blown replace with the same value else the output transistors will need to be replaced most likley along with the drivers.

Posted on Sep 02, 2009

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1 Answer

My sony receiver STR-DE135 is showing a protector message


Check for shorted speaker cables, or even a bad speaker. I'd start by disconnecting all speakers, see if the indicator goes out. If so, try one speaker at a time until you find which channel is bad, and then examine the cables carefully for things like a stray wire strand. Less likely, but possible is a shorted speaker. If you disconnect them all, and still have the protector circuit on, it's an internal issue, and you're going to need a technician.

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I have a Sony STR-DE135 receiver and the speakers keep cutting out. what could be the problem?


Heat, loose speaker wires, excess volume, low load impedance?

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

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I"m not trying to be the expert on this but i had the same problem with a older sony and it ended up be a short in the wires in the wall. You can test it with a volt meter.

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The capicitors in the unit are charged. Replacing the output transistor(s) is not a task for a novist. Capicitors, resistors, driver transistors and sometime preamp chips can also be bad as well. If all the bad components are not replaced the parts you replace could blow out again.

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your speaker wires are grounding out on something or you have popped an internal fuse or youve burnt the power supply refer to your manuel

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protection is designed to protect the output transistors from, shorted speaker wires, shorted speakers, too low speaker impediance,make sure the amp is well ventilated.
turn the amp off for 1 to 2 hours to allow thermal reset if this fails most likley some internal damage has occured and the unit will need to be serviced

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It sounds like your receiver may have a damaged output IC. I'm assuming that you've already tried a known good speaker on the right channel but if not, that would be a good idea. Also check and verify that the speaker wire is not damaged and that the terminals at each end are securely fastened.

Good Luck,
BB

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