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Strange LCD monitor symptom. MASCOT V chip?

Discussion in 'Electronic Repair' started by mike, Mar 13, 2007.

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  1. mike

    mike Guest

    I have a Sharp LL-T15A4-S LCD monitor.
    Here's the symptom:
    The screen is 12" wide.
    Draw a vertical line 2" from the left side.
    To the left of the line, the picture is perfect.
    To the right of the line, every other horizontal
    line is missing. Alternate horizontal lines
    are perfect on the right of the line.

    I can't think of a panel defect that could cause this.
    Gotta be some addressing problem in the control chip.

    I've been looking for information on the
    CK1659 MASCOT V chip and the CS8528N chip in between
    the MASCOT V and the panel.

    I tried setting up a white screen, triggering on the
    vertical sync and recording a few horizontal lines.
    Instead of a clean signal, I see a LOT of noise and
    maybe some places there's no signal, but it doesn't
    correlate to the missing lines on the screen.
    Shouldn't I expect clean digital signals to the panel?

    Any info on how the MASCOT V works or FREE schematics of
    this particular monitor? I did find a schematic of another
    monitor with the MASCOT V chip and the signal names
    suggest something about even and odd. But only part
    of the odd horizontal lines have a problem.

    I have lots of time and a desire to learn about this,
    but I'm not willing to spend money on it.

    Ideas?
    Thanks, mike
     
  2. Andy Cuffe

    Andy Cuffe Guest

    Have you checked for the basic problems? Despite all the complex
    electronics in an LCD monitor, 9 times out of 10 these weird problems
    are caused bt something simple like a bad cap, or bad soldering.
    Andy Cuffe

     
  3. mike

    mike Guest

    Thanks for the input. Yes, I have checked the obvious stuff.
    Re-read my descripton and give me a clue as to how the heck this
    can be happening??????
    mike
     
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