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MK4Arcade

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Hello,

I recently won a MK1 PCB off of eBay and it needed some repairs. I'm at that point where all of the ROMs check bad, except U89 and U105 in the boot screen. I restarted the test and now it marks U99 as bad and the graphics are all blurry. Can the bad ROMs be causing the boot screen to show U99 as bad?
 

CoolFox

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Afaik no....make sure there are no cut traces, take the U99 out and make sure none of the pins are bent. If everything checks out you may have a bad u99.
 

CoolFox

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That is a little bit odd, but all of the roms being bad is a little suspect of a bad U99 or U36. However I did find bent pins in my U99 at one time, so it's always a possibility.
 

MK4Arcade

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I had ordered an EPROM programmer so I'll update this thread once I receive that.
 
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