NeoGeo AES first run picture issue

[b3l0kk]

Hello,

I have a US AES NEO GEO first run that gives me a weird Yellow screen during the diagnostic test. I replaced the VRAM but I am still getting the same problem with the background graphics not showing up. Sound is perfect. I don't know where to go from here. I checked the board over thoroughly several times and cannot find any trace damage. The board is really clean. I attached a photo of what I am seeing when I turn it on without a game. I would appreciate any insight anyone can provide. If you need me to provide more pictures (board view, game running etc..) let me know. Thanks!

 

[Clear Paper]

Assuming you replaced both VRAM chips, I'd check the LSPC next for potentially a short due to a solder bead around its legs.

Next, being a first run board, does it have the PL241S daughter board? A bad solder there might also cause an issue.
A good way to test if this is causing an issue is to connect using a SCART cable.

Video PLL - NeoGeo Development Wiki

wiki.neogeodev.org

Pics of your board might help.

 

[Xian Xi]

Which VRAM chips did you replace, this would be for the main VRAM and not the fast VRAM.