After hooking up my Neo Geo with a RGB Cable, I noticed that colors did not render properly. Image was all “yellowish”, which did not appear when connected with it’s original (composite) cable.
At first I thought that the TV is faulty, but after testing RGB with some other consoles, and even testing with another Neo Geo RGB cable, I came to conclusion that the Problem must be within the Neo Geo itself.
As the Image is full of yellow and green, the blue Color must be missing.
After opening the console, I noticed no directly visibly damage. I found some indications on the net what components are responsible for Video Output, but theses pictures didn’t’ correspond with my System Revision.
So I traced the blue signal back from the connector.
Pin 8 was the one I was looking for.
One of the Caps for the signals that provide RGB Video had leaked out. Bingo! It was the Cap for the Blue Signal.
So I replaced that one with a new one with similar values (100uF/16V) , but some sources indicate to put higher values for a better picture quality. I didn’t bother, according to this page, my System Revision already had great RGB Signal Quality.
Running first tests confirmed that the repair was successful :
I hope that this guide encourages anyone with a similar issue to fix it, it is a very easy repair.
More picture available in the gallery below, along other games.