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Thread: MEP 805B Screen Backlight Issue

  1. #1
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    Default MEP 805B Screen Backlight Issue

    Hello group,
    So I have downloaded the CIM Brighten/Darken Specs and built out a Contrast Adjustment cable. When I unplug the P27 connector and plug in my adjustment cable, I have a beautiful color screen appear without any adjustment needed. When the P27 cable is plugged back in it goes dark again. When I plug in my CIM Brighten/Darken cable and disconnect the wire from 42 to 44, the screen goes dark just like when the P27 cable is plugged in. Has anyone else had this issue. There does not seem to be a need to adjust the contrast. I need to get the backlight to come on while the P27 cable is attached. Is there a fuse that might be causing this issue? Any Idea where I can short Pin 42/44 down the line on the P27 Cable or will that cause a problem?

    Looked up the schematics and P44 goes to the panel lights. When I turn on the panel night lighting, the display turns on. So apparently I'm an idiot and just needed to turn on panel lighting to get display to function properly.
    Last edited by wittkins; 10-22-2019 at 23:02. Reason: Problem Fixed

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  3. #2
    4 Star General Light in the Dark's Avatar
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    Default

    The best answers are the ones we figure out ourselves. Good job getting squared away.

  4. #3
    Chief and Indian 155mm's Avatar
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    Color screens require backlight to be on, so turn the dashboard lights on when you turn on master
    "Artillery Brings Dignity to What Would Otherwise Be Just A Vulgar Brawl"

    "Happiness Is A Belt-Fed Weapon"

  5. #4
    Chief and Indian 155mm's Avatar
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    Sorry i didnt ask if you had a color screen or monochrome. It would have saved you the building of the tool.
    "Artillery Brings Dignity to What Would Otherwise Be Just A Vulgar Brawl"

    "Happiness Is A Belt-Fed Weapon"

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