A bit of Mortal Kombat 2 success

greendragon

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Hi everyone, just wanted to share some success I had and a tip for any noobs like myself.

I recently bought a Mortal Kombat II board off ebay; right from the beginning it had intermitted issues with what I now recognise as getting stuck in a reboot loop (as opposed to just crashing or anything). It would just barf out to the grey booting screen, flash blue and then restart ( http://imgur.com/lkRXQ ). It got worse and got to the point where it wouldn't even boot any more; it just kept restarting.

I messaged the guy I bought it from and he suggested checking the voltage on the pins. My Street Fighter 2 and Double Dragon 2 PCBs both worked fine in it but it was worth a shot.

Well, i did and it turns out mine were a little bit different to what they should have. For reference:

+5V was +4.46V
-5V was -5.46V
+12V was +11.48V

My power supply only has a dial for adjusting +5; i turned it up and found that the highest it would go was +4.87V. The other two pins stayed the same.

Instantly the board boots and I'm playing!

So, it seems less than half a volt can make all the difference.
 
i've said it a lot but here goes.

5.18v is the golden voltage number your looking for, if you can't get voltage up to that then you should definitely be looking for a new power supply (they're cheap enough).


but, congrats on almost fixing your issue :D
 
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