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after some NEC projector repair advice

Discussion in 'Hobby Electronics' started by Mark Harriss, Jun 27, 2006.

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  1. Mark Harriss

    Mark Harriss Guest

    I scored two NEC projectors today for $25, these are a
    Multisync MT830+ and a Multisync MT1030+. They were sold
    as having a faulty power supply that would only run in
    standby mode, but turned out to be the air filter switch
    which stops the unit from running if the filter is missing.

    Anyway after playing around with them for a bit, each had
    a display fault: the 1030+ has shadowing of text before the
    actual text and the 830+ has a magenta shadow before the
    actual image, this shadow is a few pixels horizontally
    before the image and is in perfect alignment. Changing the
    display setting to be upside down doesn't change the
    shadow position, i.e. it doesn't rotate with the image.

    Has anyone experienced a similar fault with a LCD projector?.
    I was hoping the alignment could be adjusted somehow, possibly
    in software.

    tia
    Mark Harriss
     
  2. Mark Harriss

    Mark Harriss Guest

    Update:
    By by opening up the unit and disconnecting the red LCD
    the shadow disappears so it appears to be the red lcd
    that is out of alignment.
     
  3. Are there alingment screws for said LCD?
     
  4. Mark Harriss

    Mark Harriss Guest

    Yes there are adjustments screws but I understand it's
    very hard to set up without the correct software and
    jigs.

    I managed to play around with the projector some more: I had
    to find the remote for it first as I couldn't select a source
    without it. The projector has complementary colours in perfect
    alignment: yellow, cyan and magenta but red green and blue all
    have shadows: e.g. green comes out yellowish with a cyan shadow.
    It was just that red seemed more noticeable than the other
    colours.

    I suspect the mechanical alignment is fine if the complementary
    colours come out fine each using two of the LCD's then they have
    to be aligned.

    I might see if I can contact NEC and see what they think over
    the phone, it may be something simple but expensive to fix.
     
  5. Mark,


    don't bother calling NEC, you'll get sent straight to a service centre.


    Sounds like the red LCD is out of alignment. There will be 2 or 4 (probably
    4) screws holding the lcd panel. Some projectors have alignment tools, some
    don't. With patience I can get a 1024 x 768 panel alignment within 1 pixel.
    First attempt I ever made took me over an hour

    As for source, confirm a real email address and I'll send you a little
    generic alignment program, connect projector to pc via vga cable and you
    are set.


    If alignment of the panel is good then you are probably screwed without a
    service manual and service software, I cannot speak for NEC but the
    Panasonic software I have used is specific for each model. The next question
    is how convergence of the red panel came to be out.





    Regards,
    Mark
     
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