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Sony TA-AV521 I have a Sony Dolby Pro Logic Surround Reciver (TA-AV521) on my table. A customer complained that it had a crackling in the speakers. The only noticeable thing I can see is that the circuit board is dirty with debris. Do you have any suggestion of where to start diagnosising? Thanks again for time. I greatly appreciate it.

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  • Terrence  Jones
    Terrence Jones Jan 12, 2009

    Small pine needles and a good amount of dust. Im trying to learn as I go, so im growing as a tech person. No, I do not have the service manual. I can't afford it this time. Are there general areas that I can check on the circuit board if there is crackling in the speakers? I appreciate it!

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In addition to blowing off a ll the dust and debris from where it doesn't belong, spray a liberal amount of (plastics safe) contact cleaner on all the points of contact inside for the switches and knobs (look for anything moving when fiddling the knobs and switches, there are often lubrication ports in the thingies. Then jimmy the switches and knobs through their full range of motion about 25-30 times. Then repeat with a (plastics safe) silicon based lubricant.

Posted on Jan 29, 2010

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Hello,What kind of debris you see on board? Let me know are you tech person? If yes, then you should have related service manual, so you can follow suggestions easily. Thank you.

Posted on Jan 10, 2009

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All the speaker outlets seem to work fine, except the fronts, all will work, but if i plug the fronts in, all the sound then tends to just fade away, and then i have nothing, no sound. i can't figure...


I would:
1- First make sure you are properly testing using a reliable source, such as a CD Player or itunes. 2- Make sure the Listening Preset is not on Dolby Pro Logic. Make sure it is on Stereo mode and see if the problem persists.
What usually happens is that when listening to 2ch (Left and Right) Audio such as Television or Music and Dolby Pro Logic is on as a preset, Dolby Pro Logic analyzes both Stereo tracks, tries to detect the voices (center channel), ambient sounds (surround and fronts) and processes the signals into a 5.1 or 6.1 System. You tend to get a fading effect when Dolby Pro Logic is selected and listening to an old VHS, DVD or even music.
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