MVS 1F - All diag. passed but I am playing Atari graphics with music looping in and out???

[Tengugurl]

Hi!
I have an MVS 1F that I bought as a parts console.

TLR It has blocky graphics and it is missing the sprites/ corrupted graphic issue + Bios music keeps looping with no background music. S

1) Cleaned the board and took a fiberglass pen to the areas of corrosion around the board.
2) Removed old battery and CR2032 battery modded it
3) Put Diag bios in and used a Diag cart and all tests passed.
4) Unibios popped in and it works and gets to the main screen of the 161 in 1 (And other games)
a. Where things start to go wrong is when I actually select a game
b. Bios music loops over and over, sound effects work but there is no music
c. Graphics get super corrupted and Its like I am playing an atari game where one of the Sprites is a block and I am fighting another block (I can see some overlayed sprites like health meter on SVC Chaos
5) Cleaned the cart slot with DeOxit and a credit card/paper (Super dirty)
a. No fix

I ordered a z80A because I am wondering if that could be the issue?
Read here: https://wiki.neogeodev.org/index.php?title=Graphic_glitches
Didn't see my exact graphic issue.
I'd think I'd have a RAM issue and it would be called out via the Diag bios. Even cycled a few times and it kept passing the test


Any thoughts or ideas?
Thinking it could be a z80 or graphics chip. (Hope its not like a B0 or larger SMD IC... but, hey, its all in practice so no harm or fear if it is)

Any help is appreciated! You all rock!
Thanks

 

[BIG BEAR]

For the graphics, probably some broken tracks between the zmc2 and the B1
BB

 

[Tengugurl]

It’s so strange, I can see bios and cross hatch screens just fine. It’s like a sprite layering issue.

Did a visual inspection and saw a few traces that look darker/ may not have connectivity.

Going to trace it out with a multimeter soon