Viewsonic A90f color issue

[Heavy G]

I think I got the model right A90F the problem is, when its on it seems to
work. but when its hooked to a computer and shows the computer's output it
is yellow.

so I adjust the colors and find out the GREEN color wont adjust and it is
"locked" on the menu. and it wont let me adjust it. how can the monitor lock
a color and refuse to change it? the green is set to like like high, and
locked and causing everything to be yellow. is there a way to fix this? or
is the monitor just messed up beyond repair? this monitor looks new its a
19" someone threw it away I guess cause of the color problem. if its easily
fixed I want to keep the monitor! anyone have any suggestions? I dont have
any manuals to troubleshoot, and im sure that wouldnt be listed in the
manual. thanks in advance

 

[Jerry G.]

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.
======

 

[Heavy 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.

 

[Jerry G.]

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


Jerry G.
======

 

[Heavy 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

 

[Bill Degener]

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.