Question about Onkyo Audio Players & Recorders

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Greetings FixYa, First off, I own an ONKYO TX-DS939 Receiver. The first thing I noticed that was happening was it would get hot, VERY hot and the fan wasn't coming on for some reason unless I had the volume turned up FULL BLAST. As a result from it getting so hot if I would turned it off then BACK ON (right away) there would be no sound coming from the speakers, just a LOUD POPPING and CRACKLING sound. (like my speakers were blown or I was getting some feedback) Eventually there was NO sound at all. When I turn it on now, it powers up fine but if I turn the volume up even the SLIGHTEST bit the speakers just POP and crackle. Also, I DID check to make sure the speakers weren't blown by hooking them up to my brother in laws receiver. Anyway, the speakers are in mint shape and I am at a loss of what to do. I paid 2300.00 for this receiver and the thought of not being able to use it makes me want to throw up. Any help with this would be greatly appreciated. Thank you. Mike

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  • Onkyo Master
  • 5,126 Answers

I suspect that due to that heat your main power amp section has failed. Whatever drives your speakers has given up completely.

Posted on Mar 08, 2017

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SOURCE: ONKYO TX-DS939 (sound and heat/fan issues)

This sounds like the amp is seeing too small an impedence load. In other words, the amp is expecting to see an 8ohm load and is being presented a 4 or 2 ohm load. This will force the amp to work really hard and generate excessive heat. Does the amp generate sound at all? ever? If not, then you probable have a situation with high frequency oscuillations that you can not hear. This means that the amp is sending out a lot of power to the speakers that the crossovers are shunting to ground. Without seeing the output of the amp with a scope, I can not confirm this. This is not a problem that will be solved remotely. Bring the unit to a shop and request that the output be examined using a scope to check the waveforms. I suspect that a bad feedback look internally is causing the generation of the high frequency signals.

Keep us posted.

Dan

Posted on Oct 29, 2008

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