NeoGeo AES RGB-Fix

The newer Revision 5 or 6 of Neo Geo have bad RGB-Output Signals. It looks like a grid layed over the picture.
We can take care of the RGB-Fix if you are not able to do it by yourself

left site: verticallines, right site: OK!

left site: verticallines, right site: OK!

To remove the vertical lines you can do the RGB bypass I found here.

JammaNation X

mmmonkey

NeoGeo Forum

First you have a look into your neogeo to see if you have one of the „bad“ Revisions.

use a flashlight to see the revision of your neogeo board

use a flashlight to see the revision of your neogeo board

use a flashlight to see the number

This can help too

Here you can see the Layout Revision

Here you can see the Layout Revision

Part #1

Removing Capacitors, Resistors and replaceing with 3 75Ohm Resistors

Remove the 4 capacitors and 3 resistors

Remove the 4 capacitors and 3 resistors

You have to remove the four marked capacitors (red,green,blue,yellow) and the 3 Resistors (red,green,blue).

After this it looks like this

removed capacitors and resistors

removed capacitors and resistors

Now you have to reconnect the rgb Signal via 75 Ohm Resistors.
I am using some shrinking tube look here.
The Sync Signal (yellow) doesn’t need 75 Ohm you can wire it directly

3 resistors and sync wire

3 resistors and sync wire

Part#2

directly at the other side of the mainboard you find the crystal (the cause of the problem)

you have to cut of the rgb-signal in this area, so the crystal can’t sending bad signals into the rgb-wires.

cuting rgb signal

cuting rgb signal

You have to cut both sites to be sure.

cutting done

cutting done

cutting done

After further reading the links above, it seems to be allright if you only do Part#2.
When I will do the next neogeo I will check it and give this site an update, because I done first Part #1 and the picture was quite better. After doing Part#2 I didn’t saw any better picture.

Part #3  50/60 Hz

If you have a Pal Revision all games running at 50Hz you have to cut of the connector between the pal jumper.

The following picture is showing a NTSC Console.

Here you can see a NTSC Console in 60Hz Mode

Here you can see a NTSC Console in 60Hz Mode the 0 Ohm Resitor gives GND to Pin64

Pin 64 of the nearby chip LSPC2-A2 9305 E27 sets 50 or 60Hz.

GND at Pin 64 -> 60Hz
5V at Pin 64 -> 50Hz

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