Question about Sony STR-DB840 Receiver

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Losing volume on channels

My receiver is now making some strange noises which sound like a 'crackling' or 'arcing' then losing some of the channels on the cinema surround sound. The same noises are heard on the two channel option, but the two channels operate. The crackling noises seem to reduce as the receiver remains powered on for some time. Any suggestions for causes and solutions?

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  • Graham Cook Mar 16, 2007

    Thanks Techman. My fear was it wasn't worth repairing

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  • 3,130 Answers

I am afraid not. That crackling is a component in one of the solid state amp circuits starting to fail. These are all soldered into the printed circuit board. This could be a difficult repair to find an intermittant component. Depending on how old the unit is and how much it cost will factor in on if you have it repaired or not. Rule of thumb is that if the unit is two to three years old and cost less the 200 to 300 bucks you should not invest more then 100 to 150 bucks into it. Good Luck

Posted on Mar 16, 2007

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Posted on Jan 02, 2017

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About the only thing that could make noise is the cooling fan. Does it sound louder when you've just hooked up and started charging the batteries? When you've got a lot of things drawing 12v DC power? Only other noise might be arcing by a short circuit or crackling of a fire!! ;)

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Avr kenwood kr v5090


Have you tried the "Simulated" surround setting?

If you don't get sound in "Simulated" mode then you have probably lost the surround channels.

If you do get sound then your "Media"
is not recorded with a surround "Track". or the surround "Processor" may have issues that need to go to the repair shop.

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There is a crackle when i turn the volume knob.


First unplug it. Sounds like you need to spray some tuner cleaner in the pots that are crackling. Pull the knob off and you should be able to use a spray can of tuner cleaner with the straw that comes with them to spray into the potentiometer , then rotate the pot several times while it is still wet. After cleaning them all, wait 10 minutes and then try.

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Disney pixar car tv dvd combo's sound makes a crackling noise


If you hear it with the sound off something is arcing, if not a sound problem.

Nov 01, 2012 | Televison & Video

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I have a yaesu ft-736r with no audio


Hi Jermaine,

It transmits, but no receive, are you sure, have you tried playing around with the volume control?

If, so did that make any crackling noise? If so, then this is due to lack of use of the volume control, many radios, including the old transistors with dials, would make crackling sounds when you adjusted the volume, and as I say, this is due to lack of use, So if this is the case and to get your receiving, turn the volume control up & down fully for a few minutes and while doing so your radio might receive a transmission that will be loud, quiet, loud, quiet, etc., as you play with the knob.

Keep doing so until all crackling has disapeared.

Do this often as possible when firing up your radio for the day, the more use these controls get, the better.

I hope this has answered your query.

Cheers,
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May 29, 2012 | Yaesu FT-736R

1 Answer

I have a Kenwood KR-V9030 and the right channel is crackling and will not provide increased output when the volume is turned up. 1) Swaped speakers from left to right and the problem is in left speakers...


There is a chance that a common control may have developed a high-resistance or 'dead' spot and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

If it still doesn't work you might want to prove if its a low-level signal loss or a high level amp failure.

One way would be to run an RCA cable pair from the Tape Out to any other device (even a TV with speakers) you might have that accepts an audio input. If IT can't detect receive the DEAD Channel you're losing it in the preamplifying or source selection stages.

If it CAN be played externally, the receiver is losing it on its way to or at the amplification stage. Further isolation would require hands-on technical expertise.

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It depends on what wrong is with the receiver. If there is bad DSP (digital surround sound processing) board better to buy new receiver. If it is just bad channel it can be repaired below or about hundred dollars. It could be also just simple cold soldering joints. You need to bring it to a repair shop and get an estimate.

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Using a common lead pencil, gently tap on the smaller tubes in the unit, listening for noises and crackling to change and the drive channel changes.

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