Colors glitch with a CATT (Magical Cat Adventure) arcade PCB

[lovecraft]

Hello

I recently got a CATT arcade board (a clone version of Magical Cat Adventure by Wintechno ) for cheap on eBay.
The board is really clean, but unfortunately it has a wrong colors glitch.
This is a pic of the board :


And these are pics of the wrong colors glitch :



I checked the voltage, resat the chips, but no change.

However I can only try it on my LCD tv with the use of a japanese Supergun + XRGB3
I get this problem on my setup with this game board only. Somebody knows if this particular game is compatible or not with the XRGB3 ?
Otherwise, any idea where the problem is located on the pcb ?

Thanks for helping

Note: I'm looking for the japanese version of Magical Cat Adventure too, so feel free to PM-me if you have one to offer.

[system11]

You need to get it tested on a proper setup. Just buy yourself a PVM monitor, seriously. A lot of lower quality boards (and these are an example) have very high video output, it could just be upsetting the weird shit you have instead of a monitor. Do you know what colours those areas should be?

Actually, having just watched a video - those colours are way out. For each surface mounted chip, run your fingernail slowly along the pins with slight downward pressure. It's the easiest way to locate possible problems there, possibly an address line on the colour RAM. Another possibility is check the graphics chips are actually in the right sockets, I've seen that problem before...

[lovecraft]

Thank you mate I will try the method you describe.

[Zupapa!]

I have magical cat original board but I don't know if is jap or euro board. Its a good platform and obscure game.
do you know for wintechno company?

[caius]

IMHO it's a clear issue related to pallette RAM, probably some memory locations are bad.According to MAME, pallette RAM is shared with video, sprite and scroll RAM, see source here:

http://mamedev.org/source/src/mame/driv ... adv.c.html

So, I'd perform a RAM test using a Fluke 9010A troubleshooter in order to locate the culprit RAM chip.In absence of this equipment I'd desolder every RAM chip and test them in a IC tester.




P.S.
Check also for proper voltage (+5V)

[system11]

It would be better to go for non invasive options first - like piggybacking the RAM chips. I think he sold this board though.

[caius]

It would be better to go for non invasive options first - like piggybacking the RAM chips. I think he sold this board though.

OK; never mind