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Bad channel It appears I have a bad left channel. Neither the left A or B output is working. Is this a hassle to fix for someone who has a moderate amount of experience with electronics/circuit boards? Anyone here know how to do it? Thanks

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  • provision Feb 07, 2008

    It's expensive enough to spend $100 to fix....I'll do that,..thanks

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What I know about electronics could fit in a thimble, but once upon a time, when receivers were a little simpler, I was known to blow the outputs in my old pioneer, go to the local electronics dealer, and have it back up and running that day. I haven't had that kind of luck with the more complex receivers. But since outputs are normally cheap I don't think it hurts to try. If it's an expensive receiver I would take to someone who knows what they're doing, but if its not what do you have to loose. When you order the outputs also order a solder sucker and some heat sink paste.

Posted on Feb 06, 2008

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1 Answer

Very week sound


Definitely need more info - such as type of amplifier or receiver, how many speakers you are running, whether the subwoofer is powered or not.
As a simple test procedure: Disconnect all speakers and plug in a pair of headphones. Get a strong audio signal? Good, move on. No signal or week signal, you have an amplifier issue before the audio even gets to the speakers.
Next: Disconnect all speakers, turn the volume down, and connect one speaker to the left output channel. Slowly increase the volume. If that works, do the same on the right channel. Everything OK? You're putting out enough gain on both channels. Sometimes one channel goes bad. You can still listen to your sound in mono moder, or drive two speakers from the single working output. Not stereo, but dual mono. Move on.
Connect left and right speakers but not the subwoofer. Repeat the test. Whatever is left is probably the problem. If the subwoofer is powered, check the power supply or incoming voltage. If the other speakers are driven off the subwoofer or powered from there, that's likely the problem.

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Moving the wire indicates the speakers are OK. Try reversing the 3 pin plug from the cartridge. If the problem stays on the same channel, it is probably a preamp board issue. If the problem switches channels, you have a bad wire to the cartridge or a bad cartridge.

Nov 16, 2011 | Audio Players & Recorders

1 Answer

Audio volume is weak from left channel but good from right. Problem appears to be after the amp stage as the problem still exists if i swap the audio in L to R. Also tried swappping the speakers and...


More likley that there is a fault in either the pre-amp or power amp of the left channel. To be honest with you it's one of the most diffcult problems you can have, unless you can see a burnt or damaged part. All you can do is compare the parts in the right channel with those in the left.
Touching the parts in either channel with a screwdriver (don't short any) will cause a buzz! This can be used to test the channels. Work backwards from the power amp section. Remember a buzz in the right should give you one in the same place on the left!
PS KEEP AWAY FROM THE POWER SUPPLY.
If you are not good with electronics consult someone who is.

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Try swapping your cables from the sound-bar to the TV. If the sound still only plays through one channel but the channel has changed from right to left or vice-versa, then you have a bad cable.

If the performance is the same, connect a different device using the same cables to see if it's the sound bar input or the TV output.

Once you know where the problem is (the sound bar, the TV, or the cables) you'll know what unit needs repair or replacement.

It is entirely possible that a solder joint for the sound-bar has come loose. A soldering pen would easilly fix this if it's a bad joint/connection.

Hope this helps!

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1 Answer

No sounds from the left speaker even with the balance turned fully to the left. all connection are fine.


Check the speaker, switch the left and right ones and see if the left speaker still has no sound. If it works the speaker is bad, if it doesnt your left output is bad...

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Hi Bill,

It's a log time ago that I repaired those amps., but I give it a shot.
There's a speakerprotection after the finals, what I remember it's a triac (SAC187, or something like that).
You will find it at a small pcb at the back of the amp. Normally it has three legs but the centre is cut away. If it's down you will measure 0 Ohm at the output, also with a switched off amp.

Thats all I can remember, it was about 25 years ago.

Maybe it helps,
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1 Answer

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I can fix it for $325? 213 880 1795
It was a convergence problem, both chips goes bad bad also look for bad resistors around the circuit? This is not an easy repair for non skilled person? You need to realign it after replacing the chips? Don't be cheap pay someone to do it right?

Oct 02, 2008 | Sony KP-53XBR45 53" Rear Projection...

1 Answer

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It is important to know just what attemps have been made to repair the receiver. What parts have been replaced, who fixed it (a service center or a freind or yourself)? If it has a bad channel and if just one bad part was missed and not replaced, you can burn up all the parts that have just been replaced.

When a receiver shuts off seconds after turing it on, this is known as the protect mode. Most of the time is has a shorted output channel causing this. Sometimes it can be caused by a transistor in the protect circuit shorting out when the channel that is shorted goes bad. Even after repairing the bad channel, it will still go into protect if the protect transistor is bad and has not been replaced. Many times a bad channel can still have some components in it that are bad after it appears to have been repaired. This is were experience working with these type of circuits comes in handy.

Let me know exactly what has been done with full details and I may be able to help you locate the current problem.

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1 Answer

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Grab yourself a test light and make sure that not only the 12v red power wire is putting out power but the thin blue or 12 volt turn on wire is also showing power. Then test the ground terminal and make sure u have a good ground. If that doesnt work try checking the amps fuses and check the fuse and connection on the battery. If everything checks out ok and the problem persists then put a small test speaker to the channel outputs and make sure that u are getting noise from those channels if you dont get any noise then u most likely have bad outputs and blown channels, you will need a new amp. Good luck, hope i was good help.

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1 Answer

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I'd suspect that one of the two output transistors on that channel has gone bad. If you are unsure how to test or troubleshoot this, then you might try replace both the NPN and PNP outputs and catch the bad one that way. If your amp uses an output module then you would of course have to replace the module which would replace all the output transistors on both channels. Good luck. Another thing to look out for, is the emitter bias resistors. They are the large white ceramic ones near the outputs. Sometimes one of those will open up too. They will be of a very small resistance value like .5 ohms (point five ohms) or something in that general ballpark, and have a wattage value of typicaly 5 watts. So they are pretty big resistors. Be sure to check them all even if you do find a bad output transistor. They will often go out with the transistor. Good luck.

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