Question about Mordaunt Short 309W Subwoofer

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Hi my name is Ben. I have a Mordaunt Short home theatre system which is probably 6 yo but has had very little use. On standby mode, the 309W sub started to make a buzzing sound with intermittent louder noises and smelled like it was burning. I unplugged it and haven't used it since. What could the problem be? Is it likely to be terminal or can it be repaired? Thanks so much!

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It can be repaired. A transistor shorted and possibly some resistors burned open as well. This is due to an overload causing the transistor to drive hard creating heat and eventually shorting out. The transistor needs to be isolated, removed, and replaced as well as the resistors.

Posted on Nov 12, 2010

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