Question about Vizio L37 Television

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I have a new tv, a Vizio model VL370M and there is a humming noise when I am using standard definition. It is present also when I use a DVD player. It is not the cable box. A Vizio repair man put in two new boards but the hum continues. The repairman says it might be the speakers. Can you help? Thanks, B.Nesse

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You could have a loose screw near one of the speakers. I had this problem and it created a vibrating humming noise, especially when there were high pitch sounds happening.

Posted on Feb 03, 2010

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If you can handle it then check the 12VDC supply filtration. I mean to say that you have to confirm that the 12VDC is coming with stability and no noise inside it. The filtration work is being performed by the capacitors in the circuitry. Check the capacitor condition in main board please. If it is plague (bad capacitor) then try by replacing it. The sound can be mainly heard through speakers and it most probably caused by sound processing area presents in main board. This kind of thing can be eliminated by changing the main board.

good luck

Posted on Feb 02, 2010

  • SALMAN NASEER Feb 02, 2010


    its the complete block diagram of main board and here are the voltage points


    Concentrate on these diagrams and check accordingly.
    good luck



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