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No sound from the amps outputs

I have a Onkyo TH-SR502 amp which was working fine until suddenly no sound were coming from any of the output connectors (including the phono jack). I got it checked by a audio repair specialist and he informed me that the DSPB (Digital Sound Processor board?) has busted. The code printed on this board is MCDG-8230/CMKM-P3X.

Is this diagnosis correct? Or is there any known solutions that you know of that I can tell my repairmen to try.

In case the solutions is to replace this board, can you tell me how/where i can get one of these please.

Thanks in advance.

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  • Anonymous Apr 09, 2008

    I have an Onkyo TX-8210 on which the left channel is giving spotty output.  It resolves when I jiggle the volume control.  The board to which the volume control is connected is labeled: CMKM-PX3


    Would replacement of this board solve the problem?

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Before doing anything drastic I would suggest a visual inspection for cold / open solder joins around the knob and surrounding components. I would also try to clean the knob with some switch or contact cleaner.

If it passes all above and still have the problem I would replace the volume control.

But if jiggle clears it then its definitely a bad connection somewhere or a bad / dirty volume control

Posted on May 18, 2008

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Field inspection is more accurate than on line and it depends on the personal of the service spechialist.and from here i can not make fair judgement.

Posted on Mar 15, 2008

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1 Answer

I just picked up a used Onkyo TX-SR502 receiver that has no audio output on any of the channels. I obtained a service manual for it and have tried a few things, but dont know the source of the problem...


I have the same problem, how did you initiate debug mode ?
The receiver worked perfectly until a few days ago, then one day it didn't work when I turned it on but started working after a few minutes. The next day it did the same thing and the folowing day it didn't work at all. Have tried the power reset and also had the top off to see if there's anything really visibly burnt - nothing.
This receiver never got bad treatment, left on overnight a few times but not with sound running out, just powered up. It's a bit enclosed I guess so maybe overheated but I find it hard to believe.
Anyway, can someone advise how to initiate debug mode and also what to do with it.

Thanks

Oct 04, 2010 | Onkyo TX-SR502 Receiver

2 Answers

My Onkyo TX-SR502 suddenly no sound output. Why?


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Feb 22, 2010 | Onkyo TX-SR502 Receiver

1 Answer

My TX-SR502 AV receiver has no output sound in any mode but CD. Thsi has been a progressivly deterioration from sometimes sound to finally no sound.


sounds like the receiver input mode may be in the wrong setting. or check the 'direct' button. turn it off

Nov 03, 2009 | Onkyo TX-SR502 Receiver

2 Answers

No sound output


Check you audio in and out cables. . you may have them backwards.

Sep 25, 2009 | Onkyo TX-SR502 Receiver

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No sound coming out of speakers something is wrong with the receiver


check if it goes to protection mode on power on. see to it that speaker selector switch is set.

Is your speakers connected properly?

Is your music source ok?

Do you hear a click after you switch on the power? the click indicates that the time-on delay transfers the amps output to the speakers which prevents thumps going out to the speakers.

Once it goes to protection mode you need to have it serviced. This is due to a fault in one of the amps and that it protect the speakers from further damage.

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My Onkyo tx sr502 quit producing sound?


I have the same problem.It's definitely the pre-amplifier board (board with speaker terminals).I did not quite nail the exact component yet but I replaced with a working one and got back sound output.

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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

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pls make it reset at factory level ,but pls note that you have to keep it in aauto mode

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