Mortal Kombat T-Unit Graphics Issue

itobandito

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Hey guys, I was wondering if anyone has seen this kind of problem before and knew what may be wrong with my MK1 T-Unit board. Sound works fine just am getting this weird graphic glitch all the time. Tried doing the Dignsotics test to check for bad roms but unfortunately because of the graphic glitch I can't read the diagnostics screen.
 

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reseating the chips should probably help...i have an extra working board if you can't get yours fixed...let me know
 
looks pretty epic.

does the game ever halt when you turn it on, like you have to press a button to get it to start?

if so then it's generating an error of some sort.

I'm leaning towards this either being a CPU error or a catastrophically bad RAM error. check the legs on the UE13 chip, make sure none are broke off or anything. check traces, I'm thinking some major gouging in the RAM section can cause that. I don't suspect it has anything to do with the video output based on how coordinated the patterns are in the graphics.

these boards are prone to getting MAJORLY fucked up if the board's ever flexed.
 
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yeah i tried reseating the roms earlier with no luck. i didn't specifically pay any extra attentionto u13 yet though. will do so tonight any one else have things i should look for?
 
just visually inspect the solder side of the board closely. like I said, that could probably be caused by some gouged traces, particularly in a RAM section, or somewhere else... or the CPU went *pop*.
 
Also, check to make sure that none of the soldered legs have been crushed on the bottom of the PCB causing shorts across different components. I've found several Midway boards with this problem.
 
Hey everyone, just for sake of people searching out this problem in the future, this is definitely a PCB problem and NOT a rom problem. Being a T-Unit board I swapped in the MK2 rom chips and got the same exact problem. I then took my rom chips from my MK1 board and put them in a different MK1 board and they worked fine. I tried inspecting the bad PCB as well as I could and I didn't see any broken legs, or bad solder joints. Unfortunately that's the extent of my techincal abilities trouble shooting this and it's looking like I just need to buy another MK1 board
 
we know it's not a rom problem.

common on T-unit boards is the through hole solder pins touching, because someone set the board flat without the mounting legs installed. COMMON. I know, cause it happened on my MK2.

inspect the solder joints better. alternatively, the socketed PLCC chips should be inspected as well. the socket on one of mine was cracked apart and the walls weren't making good contact resulting in distorted graphics. I had to hackjob it with a ziptie around the socket to make it work. I operate my MK2 commercially and it's been fine since.
 
Oh I know you guys know, just passing making the info along to anyone that may find this thread in the future and is not as technical as others your know.

As for my board, I will give it one more look over. I scanned it with a magnifying glass last week but nada. Even attempted to bend some small pins coming out of various solder points back a bit that looked suspect but nothing.
 
yeah, check the brown PLCC socketed chips then. check to see if the corners are cracked.

my MK1 T-unit had a strange reset issue, I bought it as semi-working on ebay, wound up blowing in the middle DMA controller and like a little fuzz came out, board worked fine after that.

might be something equally stupid lol
 
Well what do you know, after giving the board one last look over with a magnifying glass sure enough I found at least 6 pins on various solder points on the back of the board touching each other. I bent the legs straight with my needle nose plyers, and actually cut some some of the excess as well and sure enough, bam board works perfectly now. Thanks for prompting me to give it another glance mecha187!
 
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