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Viewsonic G790 compressed horizontal

Discussion in 'Electronic Repair' started by James Sweet, Dec 22, 2004.

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  1. James Sweet

    James Sweet Guest

    I posted about this a while back and got a few tips but now I'm giving it a
    second attempt. HV and video is working fine, but the horizontal (separate
    H-drive circuit) has a problem. The image is compressed to a vertical strip
    about 2" wide. I managed to get it apart to a point where I can access the
    bottom of the board with the monitor running but now I'm a little confused
    trying to follow the traces and figure out where B+ is coming from. Does
    anyone know what value I should see when measuring from the side of the
    H-yoke opposite the deflection transistor? Also I'm assuming that the
    transistor must be fine since I have some deflection, I've only ever seen
    them fail totally shorted or open junction. I did test it on 12v with a
    small incandescent lamp and while the lamp glows constantly (damper?) it
    does get brighter when I apply a small current to the Base. I'm at a point
    where I need another hint to get me going on this thing.
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