Question about Audio Players & Recorders

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I have a Sony STR DE-425 Receiver im working on. It has a loud crackling noise in all channels. It can be shocked into working again for a few seconds by switching inputs back and forth. The outputs and Bias resistors are fine. The crackling is present in the volume control and thusly in the preamp or input section. I checked the Voltage regulators but they are ok. I traced the noise back to a large smd IC with 60 leads. I am lost from here as I dont know whats in and out on that IC and I had to remove the board from unit to reach this area so I cannot perform voltage tests from here. Suggestions?

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  • Darrin  Thrun
    Darrin Thrun Jul 17, 2009

    Ill try that but would that cause the distortion to be tracable back before the control?

  • Darrin  Thrun
    Darrin Thrun Jul 17, 2009

    Aslo on the crackling noise......it isnt just when adjusting volume......its constant and doesnt increase or decrease in sevarity when adjusting volume. It does increase in volume with the volume.

  • Darrin  Thrun
    Darrin Thrun Jul 18, 2009

    Thanks, Thats kinda what I figured, thats why I didnt accept the original solution offered.......Its a 60 pin SMD and I do not have a rework station. I hit it with freeze spray and it shocked it back to working but for only a second or so. Thanks for the help. Im a hobbiest thats self taught so I need an opinion when im stuck

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A couple of things to consider.

1) The fact that the volume of the noise is altered bythe volume control tells us that the source is BEFORE the volume control. This means either the pre-amp section or the switching IC. What is the number on the IC you have traced the problem to?

2) A semiconductor that is breaking down can generate this type of noise. Try to see if there is a pattern to when the problem occurs. For example, if you spray the ICs and transistors in the front end with freeze spray, does the problem go away?

Dan

Posted on Jul 17, 2009

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  • Master
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You have a dirty volume control. Either replace or take apart and spray with contact cleaner to get all the dust out. Easy fix, this is a common problen with volume controls. If you turn from left to right crackling is really bad. Results dirty volume knob.

Posted on Jul 17, 2009

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