i have a problem with my new astro city monitor.
when i play a pcb suddenly the screen blinks purple and then after a few minutes later everything on screen has a purple color.
Photo, but it sounds like you're losing green - check all the monitor cables are secure and that the JAMMA connector is making good contact before more serious investigation.
yeah, there's an old crt computer monitor we have at work that has a purple tinge to it. I figured that one of the electron guns failed leaving only red and blue (to make purple)
Sounds like 2 different issues. The OP is talking about a potential connectivity fault on the Jamma lines. The Moh issue seems more like a De-gaussing issue. A purple tinge is different from purple throughout.
This industry has become 2 dimensional as it transcended into a 3D world.
here are some pics from the back of the small monitor platine.
iam very clueless where to look and what to do...
it blinks purple after a few minutes playing a pcb, then it sometimes stays purple and then it is back to normal out of nowhere.
then again...
problem is the neckboard i think. if i hit it a little on the right side, then the picture turns purple or back to normal.
but then after a few minutes it goes back to purple.
problem is the neckboard i think. if i hit it a little on the right side, then the picture turns purple or back to normal.
but then after a few minutes it goes back to purple.
but what to do now?
There's a visibly bad solder joint in one of your photos.
For a reliable repair I suggest resoldering all the joints on the neck board. As you're in Europe, make sure you don't use the new lead free (ROHS compliant) solder for the repair as mixing this stuff with leaded solder makes poor solder joints.
@viletim: i have to check that point again and see if its really a bad one. and that could fix my problem? is that a point which commands the green colour?
Do be careful if you're tapping it... Monitors carry high voltages, and the neck board connectors as well as the glass neck itself are very fragile. The neckboard is fitted firmly isn't it?
If you do get some of the joints reflowed, the first time you power it back up make sure you don't have a board plugged in. It shouldn't really happen but I have seen screens go bang and take out gameboards with them.
problem still there, any other suggestions? i did solder some Joints a few months ago and then it was ok for some weeks but then the problem returned...
