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Repairing LCD projector

Discussion in 'Electronic Repair' started by Mike, Mar 6, 2004.

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  1. Mike

    Mike Guest

    I probably wont get an answere to this one either,

    but.

    I am repairing a sharp XG-E850U movie/computer LCD projector.

    The ballast crapped out.

    I am working on the ballast, and when the unit powers up, you can hear the
    SMPS inside the ballast start up, or the high freq pulse.

    But, the ballast will NOT pulse the bulb, and the open circuit volage on the
    bulb is 0v. it will pulse to 2v and back to 0 when you first turn on the
    projo.

    The heatsink, when left on for a minute, will get too hot to touch.

    IC1702, which has an odd number of 10T45 is the culprit of overheating the
    heatsink, and the thermal relay will kick in, and shut down the ballast.

    IC1702 drives the bulb's transformer. and I need a cross to the 10T45 IC.
    Its probably a mosfet in a packege, but I need either a cross, or a pinout
    of the IC.

    The number on the board is K837IDE

    The bulb is good, because it was tested in a friends projector.

    Any Ideas? The 300+vdc source is on the ballast.
     
  2. Art

    Art Guest

    Check all the protect devices both for the lamp and the ballast. You may
    need to try a new ballast and bulb.
     
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