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Getting a display on computer monitor

Discussion in 'Electronic Repair' started by Charlie Bress, Jul 15, 2004.

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  1. Is there a way to get a raster up on an computer monitor without having it
    tied to a computer?

    I am trying to resolve a vertical sweep problem with a Gateway EV700.
    The sweep is intermittent and can be affected by very light "percussive
    I would like to prod around the innards with a nice long nylon rod to locate
    whatever is not well connected.
    This is not my monitor and I would like to work on it on a workbench that
    has no access to a computer.

    Are there any jumper connections to the D shell connector that will produce
    a screen of any color so that I can localize the problem?

  2. Depends on the monitors, probably not for modern monitors though the
    menu/setup buttons on the front may be able to force it to generate
    a raster to display a "no sync" message.
    Do a visual inspection for cracked solder joints around the vertical
    circuitry and flyback (for the power feed to the vertical deflection).
    If you are testing monitors, you really need some sort of PC - an ancient
    laptop with a VGA connector for example.

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  3. Thanks Sam, that was what I was afraid of.

  4. Wild Bill

    Wild Bill Guest

    Monitors require the VGA signals to have any screen display. There are small
    battery operated generators that can be substituted for a PC, but the last
    ones I looked at were about $50. An old 286 PC or a laptop VGA output would
    work if you have any of that around.
    Prodding a board with an insulated tool is a way to confirm intermittent
    problems, but this method isn't extremely accurate for finding the specific
    location of the fault.

    Without a VGA signal source, you're next best approach would probably be a
    very close visual inspection of the soldered side of the board with no power
    applied. A good magnifier lamp is an effective tool for this type of
    The vertical section is generally near the yoke connector, and most often
    has a IC with inline pins attached to a heatsink.
    This IC is a good place to start, since it generates heat and the
    connections are susceptable to fatigue from thermal cycling.

    If you're not completely familiar with the required safety precautions, you
    should seek the services of an experienced technician.
    Much more info concerning your personal safety and
    troubleshooting/diagnosis/repair can be found in the repair FAQ

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