Question about Pioneer VSX-456 Receiver

2 Answers

Left Channel not working

My left channel is not giving output,it gives small amount of sound at full volume,the wire is alright,and so is the speaker,can i fix it myself?

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  • roysoup Feb 25, 2008

    distorted left channel even in headphone, when increase the volume in full the system turns off, i understand power ic or power amp is not use in headphone. Thank you very much!!!

  • Anonymous Mar 23, 2014

    when I turn on the speakers only the left speaker works

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Not unless youve had solid state trouble shooting experience and experience soldering and unsoldering. If you havent, you should take the unit to a repair shop, as there are no user replaceable parts inside this unit. Your problem is probably the output IC or associated componet. Good Luck

Posted on Jun 26, 2006

  • Larry  Dillon
    Larry Dillon Jun 26, 2006

    Maybe you expected a magic wand waved an poof all fixed???

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Hahaha, techman.

Posted on Jun 28, 2006

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1 Answer

Yamaha ax440 left channel down


Check both your input(rca) and output connections on the inside of the amp for any looseness or damage, solder connections and so forth.. However I think your power/output transistor(s) are burnt in the left channel

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I have a Sony STR-AV770 receiver that has stopped its output of volume to the left side. Any chance of me fixing this on my own?


your question depends on how good you are at electronic diagnosis (symptom diagnosis) and how adept you are at removing and installing electronc components. first you have to determine why the amplifier has stopped working on the left channel. Make sure that the problem isn't a simple one, take the speakers off the right side and hook them to the left side and see if you get sound. If you do,, then the problem is the left speaker or left speaker wire. If you don't get sound then tyr taking the input that feeds the right channel and pluggin it into the left channel and listen for sound, if you get sound now the problem was the signal from your source not being sent down the left side.
If it still doesn't work you need to move inside the amplfier, but first, get close to the back of the amp and give a sniff, do you smell anything (a pungent burnt wire or rubber smell) if you do, the the chances are good that some components have burned out. Do you recall having a shorted speaker wire on the left side? shorted speaker wires are notorious (especailly older equipment) for burning out the final amplifer stage. If this was an expensive amp it might be worth fixing, if its not worth much then maybe you should consider religating it to use as a monophonic amplifier (one channel) you could use it to power a sub woofer in a hibryd stereo or surround sound system.
I don't know what more I can tell you at this point. If you go through the steps I outlined, and want to tell me the result I shall be glad to respond and maybe give you another direction to head in. good luck and I'm glad you are adventruous enough to want to try.

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Str-gx800es sony receiver problem- right channel speaker sound is 'static', low and distorted. I have checked checked all speaker and output/input source cable connections with no luck. All left channel...


If you have checked the speakers and wiring, the right channel has a audio driver or output problem, which explains the low volume, static, and distortion. A service technician will be required to fix the receiver so it will balance the left side.

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Sound from left channel is small and distorted.


The distortion might be caused by a resistor. The loss of volume could be the capacitors, but you could try injecting signals into the transistors to see if any has gone. They can cause the distortion and loss of signal. If you apply a soldering iron to any part it will heat up quicker, or you could also use a hairdryer for the whole thing. You can also get a freeze spray that cools things that have heat sensitive faults (available from electronic parts shops).

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Check to be sure there are no speaker wires touching ground, and that the wires are connected in phase to the head unit.
Front Speakers 5 1/4" Doors Left Front (+) Green Left Front (-) Black/White Right Front (+) White/Red Right Front (-) Black/White Rear Speakers 6" x 9" Rear Deck Left Rear (+) Pink/Red Left Rear (-) Pink/Blue Right Rear (+) Pink/Light Blue Right Rear (-) Green/Red

The symptoms you are relaying definately sound like an internal amplifier problem. It is fading in and out for a reason - usually due to heat.

Have you had the radio bench tested (seperate from the car) to eliminate the car as being the culprit?

Since the radio was run with damaged speakers originally, the output or amplifier power supply on the amplifier may be bad.

As an alternative to repairing, I would suggest investing in a small 2 channel amplifier to power the speakers.

The radios claim 50W per channel, but in reality give 12-15W RMS power.

A dedicated amplifier with built in crossovers and gain adjustments will prolong the life of your speakers and add to the tonal qualities of your new speakers. Instead of turning up the volume on the head Unit, and sending out a distorted signal that will blow your speakers, an amplifier will give more CLEAN power to them, so it will be louder at a lower volume setting.

This will bypass the internal amplifier on the radio, and send a Low Level signal ONLY thru a set of RCA cables.

Good Luck!!

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Try connecting it to the left or right output from the amp to make sure the speaker actually works. It might be the receiver that's the problem. Also, you must be in one of the surround sound modes on the receiver and not the "phantom" mode as it does not give output to the center channel.

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I been replied you in chat thread, please check and feel free to ask any question.

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2 Answers

Left channel not working


The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.

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