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Vizio VO420E Half of the screen lights up, good sound.

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    #1

    Vizio VO420E Half of the screen lights up, good sound.

    Hello,

    I recently bought this TV from a family member and now it no longer works.

    This is the issue at hand:
    I turn the tv on and the orange VIZIO logo turns to white.
    I then hear a quiet buzzing noise (and i mean quiet, you need to get close to hear it) and I can see the left side of the screen turn on and the VIZIO logo on the screen appears, but only the left side of the Logo is bright and the right side is dim. Then the buzzing noise goes away at the screen is completely dark. After that I can't do anything its blank on everything. I do have sound I've connected to every port and was able to get sound thru the speakers by going thru every input. Any ideas on my problem?

    Model: VO420E

    Thanks much.
    Tags: None
    #2
    Re: Vizio VO420E Half of the screen lights up, good sound.

    Sounds like you have inverter problems. Insufficient voltage (due to caps or other reasons) can cause the buzzing. But either way, the CCFLs are not getting enough power.

    Can you clarify what you mean by blank; only the backlight goes off or even the image? (i.e can you see an image using a flashlight (I find sunlight too sometimes is very useful))

    If the inverter detects a prob (most will) it will send an error code to main and it'll shut power off to inverters.

    Could you include pics of the inverter(s) and power supply, OR just the power supply if it is integrated using a high def camera and using the manage attachments feature?

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      #3
      Re: Vizio VO420E Half of the screen lights up, good sound.

      Thanks for your response!

      What I ment by blank is there is nothing at all on the screen.
      The logo shows up and then black like the screen is off.

      I've included pictures of the inverter/power and main board. I can't find any "blown" caps.
      Attached Files

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        #4
        Re: Vizio VO420E Half of the screen lights up, good sound.

        Ok, are there any more caps under those metal heatsinks? If there are, get pictures of them showing the tops.
        Measure the voltages at those two connectors. Report it with the legend then actual
        Example:
        Pin 1 - 24v - 23.68v
        etc.

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