MEP 805B Screen Backlight Issue

wittkins

New member
13
2
3
Location
Ventura, CA
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:

155mm

Chief and Indian
Steel Soldiers Supporter
1,024
144
63
Location
Guymon, OK
Color screens require backlight to be on, so turn the dashboard lights on when you turn on master
 

155mm

Chief and Indian
Steel Soldiers Supporter
1,024
144
63
Location
Guymon, OK
Sorry i didnt ask if you had a color screen or monochrome. It would have saved you the building of the tool.
 
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