Neo Geo static sprite corruption (possible S-Rom)

Hi

Apologies for the second post in a few days on my Neo Geo, however this is a new issue and I just wanted to separate it from my previous issue as it doesn't really describe this one.

Made another video of further issues with my Neo Geo. Unable to test with any other games (as I don't own any). I have done some research and found that my issues could be related to the S-ROM as this is the part of the system that handles static sprites (health bars, insert coin etc), which seems to be the issue I am having.

I have traced FIXD0 - FIXD7 as apparently these are related to SROM, I tested the continuity from the cart all the way to the NEO-B1 chip and it seems fine. But my knowledge pretty much runs out there.

Anyway here's my video (the region warning screen is white, but not as white as my video makes out, I think it was having issues with the exposure for that shot).

I have used the Neo Geo diagnostics bios and it reports no problems. I have the UniBios as well, however I cannot test it just yet as I am still waiting for my controller to be delivered.

 

Ok, so I've tested my game on another AES and it does not present the same problems. The Insert Coin/Health Bar and other static text displays fine.

I have also tested a different game on my AES, Magician Lord, and this displays similar issues to Samuri Spirit 2. The text along the top of the screen looks wrong, as well as the life bars at the bottom etc.

So, it looks like my system is at fault. I think I have narrowed the problem down to the NEO-B1 chip https://wiki.neogeodev.org/index.php?title=NEO-B1.

These glitches also mean that I cannot see the UniBios text under the Neo Geo logo on bootup, and also I see no text when entering the UniBios menu by holding A+B+C.

I have attached some pics of my chip, and to me it looks like there is possibly some corrosion going on, what do you think? If you click the pictures then the full screen icon top right you should see the original high res photos I took.

While Samuri Spritis 2 was running I flexed the board slightly around the B1 chip, and I could get the colours to change, and if I was lucky I could get them correct.... if I then reset the console I could in fact see the UniBios text. As soon as I let go of the board it went back to its normal incorrect state.

 

hi radio , i have seen a video from Luke Morse where he cleaned some chip legs and got a AES working again i recommend you give it a shot. From memory the video on his AES was doubled and after cleaning the AES it went back to normal. Also when using the Diagnostics Bios don't rely on the initial ALL TESTS PASSED message , i forget how you do it as ive only done it a couple of times but you can enter a menu and select different tests i was advised to test them for 10 mins each.

 

If anyone is interested, I fixed it. Full post here http://www.neo-geo.com/forums/showt...-Static-Sprite-corruption-maybe-S-ROM-related

 

awesome news radiokid , have fun playing with your AES