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I fixed my rotation problem! - Dell P991

Discussion in 'Electronic Repair' started by Nomen Nescio, Nov 26, 2004.

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  1. Nomen Nescio

    Nomen Nescio Guest

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    Recently pickup up a very cheap Dell UltraScan Trinitron P991. Case in
    excellent condition, image is very good. Text is sharp. Convergence
    slightly off in the upper right corner of the CRT. But what was really
    annoying was that the whole screen was tilted/rotated clockwise about 2
    degrees. Just enough to be annoying. And even though the OSD had a tilt
    correction adjustment, it didn't do anything. Moving the adjustment from
    0 to 100 had no effect. Kind of brushed it off as a small price to pay
    for getting a cheap second-hand monitor. But the more I thought about
    it, the more curious I got about why it wasn't working. Was able to
    download a service manual, and saw that one of the schematics referred to
    a rotation connection. Now I knew I had to pull the back off!

    Sure enough, found a two-wire connector leading from the yoke, unplugged
    from a nearby connector attached to a major bundle of wires. And maybe I
    know why it was never plugged in after perhaps it was serviced, as
    plugging the two connectors together was a major bitch. There was so
    little slack in both ends that I had to reach my hands in from both sides
    of the cage and snap the connectors togther. In doing so, one hand was
    brushing against the high voltage wire leading to the CRT. And lord
    knows what my other hand was touching. But got in and out fast, the
    thing clicked together, and had managed to live to write this story.

    Put the thing all back together, fired it up, and the screen mas majorly
    tilted! Went into the OSD, and now the tilt adjustment actually worked.
    Now I have a perfectly square image! Life is beautiful:)
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