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How do you repair blown Boston Acoustics Subwoofer MCS Amp?

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Steve K

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Most often this unit goes dead because of zener diode ZD3 shorting. It is a 18v zener. replace this and you should be back in business.

Posted on Feb 20, 2017

  • mark knophler
    mark knophler Jun 30, 2018

    There's 3 boards in the MCS130... quite alot of surface mount components, I can't seem to find the ZD3 diode for the life of me, any help?

  • Steve K Jul 02, 2018

    ZD3 is on the amp board, which is one of the two boards that are directly attached to the backplate. It is NOT the board that the power cord plugs into - that is the power supply.

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3) re-install the board and plug in all the connections.
4) this worked for me and I'm enjoying my sound system again!..good luck0482b949-8492-43a6-91df-0fb2f0e6888b.jpg

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