Looking for some Midway Wolf Unit info

Long Hair

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I picked up a UKM3 with graphic errors and was hoping someone could point me in the right direction on where to start probing with the logic prob. The board boots and from what I can tell passes the rom check. It has graphic glitches and to me it looks like the colors are inverted (black is white). On the test menu checking red shows black screen, and blue and green color test show grey screen. I have not checked the rom chips because of the issues on boot up. Any help would be appreciated.
 

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I assume you have ruled out the monitor? What kind is it? Do other Jamma boards look fine? It's possible you have bad ram chips but can't tell because of the color problems. I would begin with re-seating the U45 and U47 socketed chips, or press down to firmly seat them if you don't have a PLCC puller.
 
I assume you have ruled out the monitor? What kind is it? Do other Jamma boards look fine? It's possible you have bad ram chips but can't tell because of the color problems. I would begin with re-seating the U45 and U47 socketed chips, or press down to firmly seat them if you don't have a PLCC puller.

The monitor works fine with MK1,MK2 and Ghost and Goblins. So the Monitor is OK. Don't have PLCC puller,but Have already tried pushing on all chips to see if anything changes when powered up, but nothing changes.
 
i got my chip puller in a PC repair kit any chance you have one of those?

you can pretty much just push on the PLCCs with both thumbs to make sure it's 100% seated. figure about as much pressure as it takes to open a jar maybe not quite so much.
 
i got my chip puller in a PC repair kit any chance you have one of those?

you can pretty much just push on the PLCCs with both thumbs to make sure it's 100% seated. figure about as much pressure as it takes to open a jar maybe not quite so much.

Tried this and still no change. I have a new ? for you all. I was checking the board with my voltmeter on what I believe to be capacitors. I came across one with no voltage and was hoping someone would know if it should be getting something or not. On the board it's C100, here's a pic to help. Thanks Long Hair.
 

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I was checking the board with my voltmeter on what I believe to be capacitors. I came across one with no voltage and was hoping someone would know if it should be getting something or not. On the board it's C100, here's a pic to help. Thanks Long Hair.

Well, I traced the cap back to P7. Which is next to the jamma plug, so that got me know where. ? is U45 and U47 the same chip? I was thinking if they are I could swap them and see if my problem changes.
 
Well, I traced the cap back to P7. Which is next to the jamma plug, so that got me know where. ? is U45 and U47 the same chip? I was thinking if they are I could swap them and see if my problem changes.

same chip different programming. you can swap them around from different games (hangtime/open ice/mk3/rwt) but a u45 is a u45 and a u47 is a u47 as they have their own program.

for the hell of it you should pull all the game image roms and clean/reseat them (u110 and up) if you haven't already.
 
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for the hell of it you should pull all the game image roms and clean/reseat them (u110 and up) if you haven't already.

Pulled all chip's that I could and cleaned them, I even dumped all the rom's with my QG-4X and used winhex to check against the mame dump. All rom's are good and the cleaning,reseating of the chips didn't help. But hey,it was worth a shot.
 
Pulled all chip's that I could and cleaned them, I even dumped all the rom's with my QG-4X and used winhex to check against the mame dump. All rom's are good and the cleaning,reseating of the chips didn't help. But hey,it was worth a shot.

damn, but yea had to try.
 
I picked up a UKM3 with graphic errors and was hoping someone could point me in the right direction on where to start probing with the logic prob. The board boots and from what I can tell passes the rom check. It has graphic glitches and to me it looks like the colors are inverted (black is white). On the test menu checking red shows black screen, and blue and green color test show grey screen. I have not checked the rom chips because of the issues on boot up. Any help would be appreciated.

I don't know that much about monitors and that is NOT the problem here. It souds to me like the red is not working.

Take off the RGB connector and with the game running (attract mode) measure the voltage to each of the colors *(output of the Red, Green, Blue). shoud be 2. something to 4. something. If the voltage is static (not chaning) the color is not getting from the board to the monitor.
 
I don't know that much about monitors and that is NOT the problem here. It souds to me like the red is not working.

Take off the RGB connector and with the game running (attract mode) measure the voltage to each of the colors *(output of the Red, Green, Blue). shoud be 2. something to 4. something. If the voltage is static (not chaning) the color is not getting from the board to the monitor.

Thanks for the advise kb0jjn, this was the first thing I checked before I even started this post. The board has all the colors just not at the same time or should I say not all the time. Meaning sometimes the blood will be red and other times its blue. Robot Smoke's smoke was white in round 1 and than black in round 2.
 
It is an intermittent problem and I hate them the most. The problem is it works for some time and then doesn't. I would start at the edge connector and clean babby clean that very well. Then follow the red back to see where it comes from and if the chip is in a socket clean the legs of it. I suspect a wiring/connection problem then a failing compoent. If cleaning the edge connector does not do any good and voltages are good *at all times* then you might try compoent cooler (freeze spray) on the chips where the colors come form. It may be a prom so that needs to be checked also.
 
It is an intermittent problem and I hate them the most. The problem is it works for some time and then doesn't. I would start at the edge connector and clean babby clean that very well. Then follow the red back to see where it comes from and if the chip is in a socket clean the legs of it. I suspect a wiring/connection problem then a failing compoent. If cleaning the edge connector does not do any good and voltages are good *at all times* then you might try compoent cooler (freeze spray) on the chips where the colors come form. It may be a prom so that needs to be checked also.

The problems not intermittent, it's all the time graphics issues, not just one color.
 
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I was playing around with my logic probe and noticed that the U24(74f373) had no signal on leg 19. Can anyone confirm that there should be no signal on this leg? If I have the right datasheet and I'm reading it right,when pin 18 is high pin 19 should read dead and this is what I have. Here's a link to the datasheet I'm looking @ http://www.nxp.com/documents/data_sheet/74F373_374.pdf

http://www.nxp.com/documents/data_sheet/74F373_374.pdf

Need to know what pins 1 and 11 are doing also.

It is on page 3 and 4 of the above doc.
 
ran all night, no change.

With 1 high the outputs are disabled you can see this on page 4 of the above doc in the truth table. Since there was no change with the board on for some time I would take a look at the proms/roms and verify the programming on them.

Now try to find out why oe (pin 1 is High) by following it back to where it comes from.
 
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With 1 high the outputs are disabled you can see this on page 4 of the above doc in the truth table. Since there was no change with the board on for some time I would take a look at the proms/roms and verify the programming on them.

Now try to find out why oe (pin 1 is High) by following it back to where it comes from.

I followed it back to under U33, than I got lost. Not sure how to know where it goes, I was using my fluke meter with the continuity until u33 than started checking resistance and that's where I got lost. On a side note I fixed my back-up galaxian board, so that's a plus. I'll keep testing the UMK3 tomorrow after work.
 
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