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3M MP 8650 LCD Projector Intermittent Problem

Discussion in 'Electronic Repair' started by Steve, Nov 18, 2003.

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  1. Steve

    Steve Guest

    Problem child is a 3M MP8650 that is used for video projection.

    Intermittent prob is this: When it hasn't been used for a while (random
    timeframe), switch it on and everything works fine. Switch it off and then
    back on and the problems start.

    The screen will have numerous horizontal lines (sometimes red, sometimes
    green, sometimes blue) clearly in focus. At the same time the actual video
    image appears to have stretched vertically to the point where you would
    only know there is actual video signal coming through due to horizontal
    movement on the screen.This happens no matter what input is selected eg.
    video, laptop. Also affects on-board commands, focus boxes etc.

    Switch the unit off, leave it sit for short while, turn it back on: less
    amount of horizontal lines but picture still u/s.

    Leave it off (with cord unplugged) again and, peculiarly, take it for a
    bumpy drive (discovered when we moved house!): it powers up, starts off
    haywire and within 60 seconds works fine.

    Has anyone come across this before? If it happened all the time I would
    accept that the unit is u/s and condemn it but as it's intermittent... I'm
    hopeful of recovery!

    Machine looks very dusty internally (came to me second hand). There looks
    to be a multitude of lenses and mirrors inside that I would like to clean
    if I knew I could accurately line everything up again.

    Hope problem description is accurate enough. Any help is appreciated.

    Steve B
  2. David

    David Guest

    All of the 3M LCD projectors I have seen with any kind of problems beyond
    the lamp and lamp ballast have been due to mass failure of surface mount
    electrolytic capacitors damaging the pcb from the electrolyte.

    You simply need to take the unit apart and troubleshoot the problem while it
    is acting up.

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