Question about Sony HT-DDW740 System

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Tuner Hum on Sony HT-DDW740

I inherited a Sony HT-DDW740 that gives me a very bad audio hum when I select the AM or FM inputs. The CD input and others sound clean. I am wondering what the power supply situation is that feeds the tuner(s) and if there are any known problems with capacitors, voltage regulators on this model.

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  • groucho99200 Dec 08, 2008

    Your diagnosis was right on the money. It took a bit of time to get to it, but when I did within 30 minutes it was working as it should without the constant tuner hum. My thanks and compliments..

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Check electrolytic capacitor C899 100uF 35V in STBY PCB
Cheers

Posted on Dec 02, 2008

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