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Need IC for projector ballast

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

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  1. Mike

    Mike Guest

    probably wont get an answere to this one either,


    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

    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.

    I need the cross to IC1702, 10T45

    I removed the IC, and the ballast is pulsing again, but it wont run.
  2. Chaos Master

    Chaos Master Guest

    Mike posted in sci.electronics.components , in article
    It's because you've posted this thing 3X!!!

    Chaos Master® - Porto Alegre, Brazil!
    IRC #XLinuxNews or #POA of , nick Wizard_of_Yendor .
    Powered by NetHack ( , Slackware 9.1 (Linux User #327480 - at
    CygWin, GnuWin32, and so on..
  3. Mike

    Mike Guest

    dont mind that, because the mail server screwed up yesterday, and i posted
    over at google, and still didnt show up, so i waited till l8r, and reposted.
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