Question about Sony MHC-NX3AV Shelf System

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No radio My Sony started to buzz in Pro-logic mode & now for some reason the radio will not work, any clues? all the wires are in the right place.

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  • omegamen Jun 15, 2008

    Exactly the same problem.... wish I could get it repaired... 15th June 2008

  • surprisingly Nov 19, 2008

    I have the same problem, noticed it yesterday. When I switch on the 5.1 speakers, the buzzing starts. It happens either by using the Pro-Logic mode, or by using the DVD 5.1 mode.

    I opened up the system (warranty is wayyy out of date - bought it in Feb 2000) and found out that the side board was cracked at the point it is screwed to the bottom panel. Now this may or may not cause the problem in my case. It is a small crack and also no routes appear to be broken in the IC. However, it might function as a ground connection and be needed.

  • Anonymous May 03, 2009

    Same problem - buzzing in the rear three channels in any mode where the rear speakers are enabled. Haven't taken it apart yet, but I am handy with a soldering iron, so will try the suggested cap kit.


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Here is the solution for your problem.
You have to look at the 10volt B+ on the mainboard.
This voltage goes to the tuner en other ic's.
You have to replace the next capacitors:
C921 470/25v, C922 1000/35v, C920 1000/16v, C924 47/16 and
C927 100/16v.
The best to replace them witch 105 degrees capacitors, then the problem don't come back again.

Good luck

Ben Bierhuis

Posted on Jan 14, 2009

  • Jose Luis Perez Jun 28, 2013

    Great! It was C921. You're the boss. Thanks a lot.

  • Jose Luis Perez Jun 28, 2013

    Great! It was C921, as you said. You're the boss. Thanks a lot.


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