How do you remove AES daughter boards right?

I have a NeoBitz board in my NeoGeo AES system Serial #31,084. I am wanting to remove the daughter board from the system but of course keeping the system running normal. The reason I want to do this is because it seems to be part of the problem with the rainbowing effect on the system maybe. Before the NeoBitz it did not do this. I tried calibrating the 50p potentiometers on both near the CXA chip and the one on the daughter board. Anybody fooled with this?

If you didnt get the rainbow effect before you put in the Neobitz board then why not take the neo bitz board out?

Isn't the rainbow effect supposed to be there?

Ok i'll be a little more specific on this. In component video mode, I get no rainbow effects at all with the NeoBitz. In S-video and composite video I do get it. It is expected in composite mode but atleast it used to stay still instead of waving across the screen. The S-video in my old style mod never had rainbowing effects, but its does now with the NeoBitz and it is less intense than in composite mode.

Those 50p potentiometers inside can adjust the wavyness and dot crawl here and there. I can't get it all to stand perfectly still though, because I think the daughter board makes it more unstable.

The SVid should be pretty solid - better than the internal mod. I really can't tell how you've installed, but it sounds like it's picking up some interference(?), so if you ever wanted to send it my way to check it out, I would glady take a look for you.

The SVid/composite circuit was added to the Neobitz as a last minute decision so it really doesn't deviate from the mfg specs -- so it could stand to use some tweaking... I've sent some of the AD724 chips back because they failed in testing. So thinking on it, there actually could be something up with the AD chip on that neobitz board.

I actually need to purchase one of these first gen Neo systems to examine what all SNK did with that little board they installed. I've never really looked at it... I know they cut a crystal and cap (maybe more) off the main board's video circuit.

Just let me know if you want me to look over your install sometime.

Jeff

Yeah it's weird that they took off the crystal and put it on the daughter board, also goes for the caps. The funny thing is that the daughter board has a few chips on it as well. I still up to this day wonder exactly what it does. I always thought it was used to fix the rainbowing effect to begin with. I don't think it was only for that reason, it was most likely to just meet the FCC regulations.

I remember having a non-modded at all 1st generation board as my first AES and it had no daughter board plus RF shielding, but it had the worst rainbowing ever. Adjusting the 50p didn't do jack on helping the signal. Man SNK, why couldn't you guys hire better engineers back then. Atleast the CDZ had perfect video, although the RGB colors were a little too intense for S-video and composite in my opinion, but that was easy to fix, just lesser valued resistors.

Whoops goofed up. I meant higher valued resistors.

For anyone that was following this thread, the problem has been solved. The audio jacks were grounded with the video jacks which was causing the interference. Once he seperated the jack grounds, everything worked ok...

Jeff

Yep, that did it for the S-video. The component video was always perfect though. As for the composite, oh well. My system had the rainbow effect in composite before the mod, which all early NeoGeo models had that. The only difference was that it atleast stayed still before the mod, now it waves one way or the other on the screen, but it is composite so it's not like I am going to use that connection anyway.

I just wanted all the connections to work best just so I can take my Neo Geo to some of my college gamer friends out of town that have never seen the Neo Geo in action for example. Then use it on different TVs with the best signal possible for each different type of connection connection.

I noticed that the quality of the composite video went down after the Neobitz mod, but it doesn't bother me because I am taking full advantage of the beautiful component video anyway, but I see your point. It would be embarassing to have to explain why the picture is coming in so crappy if all your friends TV had was composite.

BTW, my system is a 1st gen too, so Jeff you should still have my daughterboard unless you threw it away. Maybe you could do research off of that!

My college gamer friends live in the old victorian 2 story house they all rent, each of them have a TV in their rooms, also there is one in their living room. With 6 TV's I am damn sure one of them has S-video atleast, so its no big deal.

Here is something I noticed though. If you still use the standard NeoGeo Din pin AV cable that gets its signal from the CXA1145 chip, you get the original composite video you had. So just use that for your composite video. The funny thing is though, the NeoBitz composite video has more lush colors. I am not sure if its because its draining the signal from the CXA1145 or what. So theres something to mess around with.