Viewsonic A90f color issue

The red and blue are the adjustable ones in this model, if I recall correctly.

Comon causes for the fault you have, are a failure in the video drive circuits, or the CRT is defective. More often, it is the CRT that goes in these monitors.

A tech who is properly trained in monitor service, and has the tools to work with, can check the monitor for you, and tell you what the fault is.

Jerry G. ======

Actually after taking the cover off I found the problem...

what it is, is the box that plugs into the tube on the back of the CRT apparently theres a bad connection cause when I wiggled it a little the monitor was working perfectly. I just have to turn it off and let it sit for a while and take the box off and check the pins to make sure they make a good contact. then take some plastic ties and try to secure it so it cant jiggle around again.

To have proper reliability, why not properly solder the connections back???

Jerry G. ======

I replied after finding the real problem. I soldered the connector securely back to the PC board and it works as good as new. all that was wrong was the solder joints broke loose, I would assume cause of moving the monitor the stress on the box probably contributed to the joinds breaking loose. but as I said they were resoldered and I added a little extra solder to strenghten the connection. its a nice monitor too. very big picture :) and it was free! I guess it was worth the time to disassemble it to diagnose the actual problem and be able to repair it easily. so whoever threw it out im sure would be pissed to know it was an easy fix. oh well they probably had enough money and bought a new one. I mean after all the one they threw away was only a few years old, and 19" monitors arent cheap. better for me cause I put it to good use :)

Good for you! It's rewarding to save a piece of equipment from the trash and fix for a little patience. I've been using 6 trinitron monitors I fixed (bad capacitor) for years now. :)