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PCjr Display missing colors

MicroCoreLabs

MicroCoreLabs

Experienced Member
Joined
Feb 12, 2016
Messages
298
Just took this display out of storage and it appears to be missing some colors - blue is the most obvious one!

The display does not respond to either the brightness or contrast controls.

I left it running for a while to see if the caps would heal or get worse, but the image stays the same.

Any thoughts about what could cause this?


View attachment IMG_3668.JPG
 
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No bent pins on the connector, and the output looks fine coming out of the PCjr composite port. The issue must be in the display.
 
Is the "Color Display" schematic in the IBM PCjr Technical Reference for the IBM PCjr Color display, or is it for the IBM 5153?
 
The schematic in the tech ref is for the 5153.

I posted a schematic for the PCjr monitor that was found at Computer Reset. Unfortunately it’s a poor-quality copy that’s rather hard to read in a lot of places.

Mikey99 posted photos of a more readable schematic, but it appears to be for an earlier revision and differs in a number of ways from the actual monitors I’ve seen. The Computer Reset schematic seems to be mostly right for extant monitors but has at least one significant inaccuracy that I discovered in the repair thread linked above.
 
LOL! I love it :)

I checked out your link.. jumped to the last page. Read backwards to the point where C205 was a suspicious cap, measured mine.. and found that my C205 was indeed shorted! All I did was snip one leg and the colors came back. I will replace it shortly...

Was fixed within six minutes. :)




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