Question about Flat Panel Televisions

3 Answers

TV comes on and works fine, after some time lines scroll.

It is like a vertical and horizontal hold go out. Once I turn the unit off for awhile I can turn it back on and it will work.
I can open the unit and change boards and also have a place to buy parts and get the part numbers.

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  • 2 more comments 
  • timnj07052 Mar 12, 2009

    This is a Vizio 47" LCD Model Number: VO47L HDTV10A



  • timnj07052 Mar 12, 2009

    I ordered the part, I will let you know how it goes.

    Thanks

  • timnj07052 Mar 26, 2009

    So, I replaced the main board and I get the same thing. What next??

  • timnj07052 Mar 30, 2009

    So, I could not find my Voltage meter. I had to go buy one. I have checked all the power and it is well with in range (24va required, output is 23.5va)



    What now?

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Is it vertical roll? Or horizontal roll? It could be both.

This is caused by loss of vertical and/or horizontal synchronization of the scanning lines that produce the raster.

It is usually caused by a defect in the electronics section called the deflection circuitry.

You may be able to adjust it back enough to get it working if you can find the vertical or horizontal "hold" controls (they may be called by some other name). They are sometimes seen at the on-screen display section, sometimes on the front or back panel and sometimes inside the back cover. On newer sets it is factory fixed and their are no user adjustments. So, you might have to poke around until you find them.

If you cannot find them, or if you do find them and they don't adjust enough to lock in the picture then you will need servicing and the cost will be to replace the IC or transistor that produces the hold lock on the deflection system.

Hope this leads you the right direction.

Good Luck

If my solution proves useful please accept it.

Regards
Arjun

Posted on Mar 31, 2009

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Check the power voltage .may be its an over voltage problem that is going in to the main board so due to that the component getting over heated and due to that this is happening.check out the pcb board voltages.this will clear the doubt.

Posted on Mar 26, 2009

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It sounds your TV lose Video Sync signal during function and get video sync signal back when you give it rest.

Possible cause can be lose connection or dry solder joints in video signal section. It would be fine if you post / comment back with model and brand of TV.

Posted on Mar 12, 2009

  • Shahid Electronics
    Shahid Electronics Mar 12, 2009

    In my opinion, problem is in Main Board of Vizio TV.
    Please click Shop Jimmy and see main unit of this TV including price info.


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If Your screen shows a: white vertical line on a black screen or, a white horizontal line on a black screen:
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