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Amp powers on but no sound - Audio & Video Receivers

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Well, I had the same problem. Solved it today by gently pushing one of the large capacitors towards the large coil. Kind of strange solution I guess, but it works for me :).

Posted on Nov 08, 2008

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I have pioneer cx -770os the sound just stopped It and my tuner are powered up So why.. does it all power mob the equalizer shows music is playing but no sound and how do I fix it


According to the service manual the main amp is on a "power amp module". If that goes I guess it takes out all sound, but leaves everything else working.
You can see the manual here, but it doesn't say much about the power amp module.
http://elektrotanya.com/pioneer_cx-770_770s_sm.pdf/download.html

May 03, 2016 | Pioneer Audio & Video Receivers

1 Answer

Have a Harmon/Kardon AVR 20. The right channel produces an extremely weak signal when playing music through any input. (Yet, once I hit the "test" button, the sound hits each speaker equally). Help!


It sound like it could be the pre-amp that is playing up. The picture you posted shows that the pre-amp can be listened to separately. All you need to do is pull the two black jumpers out. And connect a separate power amp to the "pre out" sockets. Leaving the other two not connected. If the weakness is present you will know it's in the pre-amp and not the power amp stage of your amp.

Sep 06, 2015 | Audio & Video Receivers

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I have a ken wood kr-797 stereo receiver but I can get sound but it's very low and I have to have the volume set at 0db in order to hear anything. It's like this on all inputs


I suspect that the pre-amp stage in you amp has failed. What you are hearing is the power amp on full volume. But with no pre-amp to boost the signal it's to low.
What we do know is that the sound is going into the pre-amp and out for you to hear it. This could mean that the power to the pre-amp stage is low, but still present.
Pre-amps these days mostly consist of a single IC. That could have failed, or it is not getting power. Since it would be possible to test the voltages to the IC, one pin should have something on it to the region of 6 to say 20 volts going into it. If the IC has that going to it, it has failed. If the voltages to all the pins are low, then you have a power problem.

Aug 27, 2015 | Audio & Video Receivers

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My vr-507 shut down to protect my speakers but will not power up now.


Sounds like the output transistors in the amp are blown. Try powering on without speakers attached - if it still shuts off your amp is blown and needs to be repaired.

Jan 17, 2014 | Kenwood VR-507 Receiver

1 Answer

No sound from my ja 687 amp lights show receiver is working


Need to check on the power supply to the output drivers, if there is no response on the speakers it is possible that the output replay is under protection. You need to remove power plug and leave aside for an hour before the amplifier is plugged back. If all functions show on display but there is no sound check the PREAMP output- audio out. If there is audio then the fault is with a non switching of the power amp or a power amp protection. Since these are mounted boards with little access to testing you need to be skilled to go further to probe and proceed. Also Denon might refuse to service if the amp is tampered which also can be expensive.

Oct 25, 2011 | Denon AVR-687

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Power yes but no sound from my kicker amp


the i c sound have damage now you need to take it to a technician let them change it

Dec 15, 2008 | Audio & Video Receivers

1 Answer

Onkyo TX-SR502 AV receiver


this could be the pre amp transistor or the power amp that needs replacing
the pre amp transistor is cheap but the power amp is not
if you did not crank it , then it is probably just the transistor that needs replacing

electech

Oct 31, 2008 | Onkyo TX-SR602 Receiver

1 Answer

No sound with the front speakers


Sound to headphones comes from the pre-amp stage of most units otherwise they wouldnt be able to handle the power output . 150 watts into your ears ouch lol .
So it sounds like your slave amp has gone down on one channel . a slave amp is the final output stage and the power stage to the speakers . to make sure it is the amp change your speakers over if the sound then works from the speakers that had been dead then its the amp and requires an engineer to check it out with the prospect of a new output IC or final stage / capacitor replacement

unskilled persons should not attempt to repair electronic equipment as it is unsafe to do so , and may cost you far more in the long run ?. Regards Vortash

Aug 26, 2008 | Denon AVR-1802 Receiver

2 Answers

No Sound From a Denon AV Amp


maybe your speaker are busted tyr to check it...the connection of the speakerwire sometime may be lose...or try check the wire to speaker by the tester, if had a rading continuity

Feb 29, 2008 | Audio & Video Receivers

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