UMK3 PCB RAM errors

ToplessZ

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Donor 11 years: 2011, 2013-2022
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I got a UMK3 (wolf PCB) that has bad U13,U14,U15 on boot up and then has bad backgrounds during game play (vertical lines) , I have replaced all three with known good ram chips and they are still showing bad, so just for the hell of it I replaced the socketed square chips, no luck. Im guessing its probably one chip that controls the ram not sure which though anyone ever have a ram issue like this that they fixed that wasnt the ram chip itself?
 
Let me know if you get this figured out. I have 5 complete wolf units with this same issue.
 
Vid of bad U14 on my WWF Wrestlemania Wolf Unit, had channelmaniac replace it with one i bought new off ebay, works flawlessly now. Same vertical lines as you seem like your having as well as some random pixels.

 
as a matter of fact I got bored today and so far I have replaced half a dozen chips trying to find the culprit.. Im leaning towards broken trace somewhere that I cant see..
I can tell you its not
U49
U41
crystal at U46
U33
U24
U25
U45
U47
U35
Gotta love the shotgun approach.. too bad I keep missing!! LOL
 
if you've replaced the chip and your sure it's done right then yea i'd say bad trace(s) or bridged trace(s) as well, especially as you have a bunch of bad chips, not just the one.
 
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