xgarbo, I feel that there are a few things that need to be clarified. No CRT VGA monitor has a Yellow output from the graphics card or in the VGA cable. They are called RGB monitors for a reason. Red, Green and Blue are the colors that are used in a process called "Additive Mixing". Here the colors Red and Green make the color yellow. I venture out on a limb to say that you are most likely missing Red (most common bend or broken pin on the cable. VGA pinouts are pretty standardized, I checked the service manual for your computer as well, and the pinouts is as follows:
1 Red video input
2 Green video input
3 Blue video input
4 Identical output - connected to pin 10
5 Ground
6 Red video ground
7 Green video ground
8 Blue video ground
9 No pin
10 Logic ground
11 Identical output - connected to pin 10
12 Serial data line (SDA)
13 H. Sync / H+V
14 V. Sync (VCLK for DDC)
15 Data clock line (SCL)
So , I would suggest that you proceed and check the Color temperature settings on your computer, make sure the monitor cables is properly connected to your computer, check to see if the monitor cable has bent pins. Since you are using an adapter, you want to check that as well. You should also tell us what video card you are using, since it requires a special adapter for a VGA monitor. This could be another culprit for the color change. If all this is okay, and you can resolve your problem through "percussive therapy" (hitting the monitor or the cable, it is also possible that you have a cold/cracked solder joint. A simple reflow/resolder of the cable may resolve this issue. Worst case scenario is a faulty CRT color gun (even that can be adjusted, unless it has absolutely failed) As you can see there are a few options you have before giving up on the monitor. Since you do a lot with graphics, you also know that the color clarity is still great with a CRT monitor, and to get that from a LCD monitor, you will have to spend some pretty good money. Yes, working on a CRT monitor can be dangerous, if done in a careless way. However, removing the housing of the monitor to check the wiring is absolutely within anyone's capabilities. If you want to get deeper into the repair, you will have to discharge the High voltage discharge capacitor first. Unless you do know how to do that, I recommend you stay away from the HV part of your monitor. Hope this helps, good luck.
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It was the cable but I had to finally say goodbye to the screen, I will be replacing it with a 21,8 inches LED 1080p monitor which will probably be better at some points since the old one could only go as far as 1280-1024 and it was 4:3 while the new one will be 16:9... Thanks everyone for you answers!!!
by xgarbo