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.

Before repair – notice the green sky and the yellow text (credits)
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.

Imagine a world without blue….
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.

Image courtesy of Tim’s Site : http://members.optushome.com.au/eviltim/gamescart/gamescart.htm
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.

There it is !
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 :

Quick ‘n Dirty Test Run

After repair : Sky is blue, and text is crisp white
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.
- Colors before repair. Notice the green Sky and the yellow text (Credits)
- System Serial Number
- Opening the System
- Systemboard with no visible damage
- Faulty Cap for the “Blue Signal” (Pin 8 on the AV Connector)
- Faulty Cap removed
- New Cap in place
- First quick’n dirty test run
- Colors after repair. Notice how blue the sky is now.
- Miracle Adventures (Spin Master) Title Screen
- Miracle Adventures (Spin Master) Demo Play
- Mutation Nation, Game Play
- Mutation Nation, Game Play
- Ninja Combat, Game Play
- Nam-75 Game Play, First Boss
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