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CPS1 Graphics Issues - Forgotten Worlds
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WhiteCrow
Hi everyone. I'm new the forum, and stumbled across the wealth of CPS1 information here while troubleshooting a Forgotten Worlds PCB to be used in a dedicated FW cabinet restoration I'm working on.
While cosmetically the board is in incredible shape (probably the cleanest CPS1 set I've ever seen!), it has had numerous issues. When first fired up, it would play music shortly, and then go into the self-check which it seemed to pass. It was difficult to see for sure as the text is completely scrambled. The graphics also were very glitchy with blocky red artifacts. This is also unfortunately one of the older CPS1 versions with awful QFP mask roms on the B board.
Using a known working A board from a Strider set I was able to isolate the problems to the B board, which cleared up the red junk, which presumably is an issue with the A board I'll worry about at a later date. :) I pulled and dumped any EPROMs I could, and found two bad ones in the set, both 27C1000's, which I reburned successfully. Unfortunately the graphics and text are still scrambled, and it locks up completely when loading the first scene of the demo loop. Physically everything looks great. The traces and legs of the customs and logic seem in perfect shape, and the sockets are clean. I swapped the compatible PAL (LWIO) from Strider to the FW B board with no noticeable effect.
Here's a link to a video of what it looks like currently. Excuse the vertical orientation, as it's plugged into the Egret 29 at the moment.
https://www.youtube.com/watch?v=bCRNkSfCQb8&feature=youtu.be
I'm at the point now where I don't quite know where to look next, and am starting to suspect that one of the HN62404FP-18 might be bad, which would be really unfortunate, as I gather there's no replacement. Before resorting to a conversion or emulation for this dedicated cab, I figured I'd ask some of the resident CPS1 experts here if they have any insight. Thanks!
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