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What component controls sound on this main board

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    What component controls sound on this main board

    ok this main board is out a vizio lcd it would turn on but no sound so I replaced main and got it to work but id like to fix this and sell it on ebay, but what component can I change to get sound to work? im pretty sure the connector in top right was for speakers
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    Last edited by mattstolte; 08-02-2014, 04:13 PM.

    #2
    Re: What component controls sound on this main board

    Top right is the audio amplifier. There are a few other places where the audio could fail. Usually the audio has a separate power supply, 8V or 9V is pretty typical. That can go missing causing other faults...
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      #3
      Re: What component controls sound on this main board

      so is there nothing I can replace to fix the sound? I don't have the tv anymore but would like to fix board if I could and sell it

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        #4
        Re: What component controls sound on this main board

        Your question is akin to asking how to repair a car that doesn't start. You've replaced some expensive part and it now works, but since selling it, you have no way to test/debug the old part, or confirm that you have fixed it. I don't know what else you expect? Unless someone knows of a common fault, I think you are SOL on this one for now.
        Last edited by tom66; 08-02-2014, 05:14 PM.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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          #5
          Re: What component controls sound on this main board

          What component is audio amplifier

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            #6
            Re: What component controls sound on this main board

            That IC are the stereo amplifiers (in this case they are Class D amplifiers) that drive the speakers. You have power amplifiers that drive speakers, and the n you will also have pre amplifiers which drive the input of the power amplifiers, so it is not simple.
            Last edited by budm; 08-18-2014, 02:04 PM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

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              #7
              Re: What component controls sound on this main board

              Originally posted by budm View Post
              that ic are the stereo amplifiers (in this case they are class d amplifiers) that drive the speakers. You have power amplifiers that drive speakers, and the n you will also have pre amplifiers which drive the input of the power amplifiers, so it is not simple.
              so your saying this doesnt have just one ic amp?

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                #8
                Re: What component controls sound on this main board

                Very few TVs do.
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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                  #9
                  Re: What component controls sound on this main board

                  and what am I looking for? should I have this on dc volts?

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                    #10
                    Re: What component controls sound on this main board

                    Ideally, you'd use a scope to trace the audio signal through the set, which goes to the amplifier IC. It may for example pass through an op-amp or filter stage.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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