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Pincusion/Convergence Problem I just replaced the HV Splitter and it sovled my arcing problem. The TV comes on fine, but I have a severe convergence problem and the screen seems to be pincusioning at top and bottom. Also, my 'adjust projection TV' listing to adjust the convergence no longer appears on my menu screen. Even though I use to repair TV's, I have not had the pleasure of fixing a projection TV. Any clues as to what could be causing the problem?

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  • Bassplyr
    Bassplyr Jul 26, 2009

    I know, I use to work on them. I have an Associates Degree in Consumer Electronics, but I've never had the privilege of working on a projection TV like mine, plus I don't have the schematic for it.

    This much I do know. It's component related. I believe it's a problem with a capacitor in the convergence circuit or a cold solder joint.

  • Bassplyr
    Bassplyr Jul 27, 2009

    The problem is intermittent. Last night I watched the TV without a problem for 5 hours. The next morning I turned it on it was okay for about 10 minutes, then it went out of whack while I was watching it. The problem seems indicative of a capacitor problem because the pincushioning slowly gets worse the longer the TV is on. I'm going to look for what you suggest anyway. At this point I've got nothing to lose. Hopefully I won't have to track down a schematic to find the problem.

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You can find some presets on the display section of the motherboard. You try adjust to fine tune the picture.

Keep a mirror in front of the TV and try adjust the presets slowly with the help of a properly insulated screw driver.

Caution TV venerates very high voltages.

Posted on Jul 25, 2009

  • shameer ahamed
    shameer ahamed Jul 26, 2009

    You can don't require the schematic for finding those presets, and this problem is not because of the capacitor dry soldering. It is because of the alignment issue. You can easily find the presets on the mother board and it usually lies near the cables connecting the mother board and the CRT and the presets names are usually printed on the board itself.

  • shameer ahamed
    shameer ahamed Jul 27, 2009

    Yup you are perfect, if the problem suddenly in the sense then the problem is with the active component. So you check the huge capacitor fixed near the LOT and check the appropriate voltage level to and from the CRT. It might happen because of the deflecting system.You can find a couple of capacitors near the control cables running to the CRT check that too and let me know.

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