1200 display color problem

[zombi]

One of my friends has a display problem in his 1200. I remember a smiliar problem and the solution mentioned in amiga.org.

I searched the thread. But couldn't find it.

The problem is a missing color. It display yellow instead of white and grey instead of light blue and light yellow. Do you have any idea?

[amigagr]

i have similar problems with my 1200 from time to time. i have the monitor 1084 with a scart connection and the problem is exactly this scart, that when i move or press it more and in varius directions the screen comes up ok.

[zombi]

I think in this case the problem, although i hope so, is not the cable. It is the Amiga that produce wrong colors. There should be a failed think inside.But i dont know what is it.  

[amigagr]

maybe you are right.
personaly i prefer to have troubles with cables
i can fix them but the amiga don't...

[AmigaMance]

The problem is a missing color. It display yellow instead of white

So, the missing color is the blue one. Have you checked the B wire of your cable if it is uninterrupted, or if the respective pin in your Amiga/monitor port is broken?

EDIT: Sorry for the confusion, the blue signal is missing not the red.

[zombi]

AmigaMance wrote:
So, the missing color is the red one. Have you checked the R wire of your cable if it is uninterrupted, or if the respective pin in your Amiga/monitor port is broken?

Then, what can i do if there is no blue signal in video port?

[AmigaMance]

Then, what can i do if there is no red signal in video port?

Try to isolate the problem first?..

Edit: correction applied to my previous post.