MK3 PCB repair?

If you don't mind me asking, what is wrong with it?
 
It doesn't boot up at all, and the only thing I can find on the board is this little burnt guy..."C-10
 

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Take a hot soldering iron and take that cap off the board. See if it will boot up then.

When those tantalum caps short they tend to burn... but, sometimes you'll get one that doesn't fully go up in smoke, taking a chunk of the board with it. When that happens they tend to keep the switching power supplies in shutdown mode.

RJ
 
Take a hot soldering iron and take that cap off the board. See if it will boot up then.

When those tantalum caps short they tend to burn... but, sometimes you'll get one that doesn't fully go up in smoke, taking a chunk of the board with it. When that happens they tend to keep the switching power supplies in shutdown mode.

RJ


The C-10 cap? (Little yellow guy?) Just wanna make sure we're on the same page lol
 
Yup. They tend to short out and either shutdown the power supply or burn a hole through the whole board.
 
Is the board powering up or is the power supply shutting down?
 
check the LEDs. I don't remember the exact pattern, but I think if the two next to each other don't both light up, and the one farthest away never lights up, that you're looking at a problem with either the U45 and/or U47 graphics processors being bad. either one will result in the game either outright not powering up OR you may have a scenario where the game will play blind.

you can alternatively try feeling either one of those chips. if they get hot or you notice a bubbling in the middle underneath the label, they are probably bad.

I had a board do this, but once I donated said chips from my good UMK3, I had a sound error pop up. I can't remember that chip off hand, but it's the little socketed chip near the sound section that was also bad lol. so perhaps my game did play blind, but I wouldn't know cause I had no sound.
 
check the LEDs. I don't remember the exact pattern, but I think if the two next to each other don't both light up, and the one farthest away never lights up, that you're looking at a problem with either the U45 and/or U47 graphics processors being bad. either one will result in the game either outright not powering up OR you may have a scenario where the game will play blind.

you can alternatively try feeling either one of those chips. if they get hot or you notice a bubbling in the middle underneath the label, they are probably bad.

I had a board do this, but once I donated said chips from my good UMK3, I had a sound error pop up. I can't remember that chip off hand, but it's the little socketed chip near the sound section that was also bad lol. so perhaps my game did play blind, but I wouldn't know cause I had no sound.


The two led's next to each other come on, but the furthest one does not
 
Something else to consider, if the revision roms are bad, the game will not boot. Try installing new revision roms if you can.
 
Something else to consider, if the revision roms are bad, the game will not boot. Try installing new revision roms if you can.

I suppose you should also inspect your U54 and U63 roms for any potential corrosion too, though I've never seen it happen on Wolf boards (yet...)

the corrosion naturally will prevent the data from getting in and out from those, same thing as them being "bad" :)

if you have the proper hardware to erase and reprogram them, I've used the MAME roms to upgrade mine in the past. works like a charm.
 
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