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Author Topic: Mortal Kombat 2 - Cmos chip U49 bad  (Read 3495 times)

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big boss

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Mortal Kombat 2 - Cmos chip U49 bad
« on: August 08, 2010, 09:22:28 am »
Hello Friends,

i have buy yesterday a MK2 pcb, yesterday i havent problems with it. Today i have cmos U49 bad. I cant play. See the foto and movie. What is the problem, what can i do?
Sorry for my bad english  ;D

http://www.abload.de/image.php?img=u49xxeo.jpg



best regards
big boss
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Kevin Mullins

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Re: Mortal Kombat 2 - Cmos chip U49 bad
« Reply #1 on: August 10, 2010, 09:26:15 am »
I'd start by checking the onboard battery for the CMOS. (3volt 2032 or 2025 I believe)

Or change the physical dipswitch settings for the Coinage.
(Bank 2, SW1 OFF)

http://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/Mortal_Kombat_2_%2816-40029-101_Oct_1993%29.pdf
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Not a technician . . . . just a DIY'er.

Malenko

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Re: Mortal Kombat 2 - Cmos chip U49 bad
« Reply #2 on: August 13, 2010, 08:22:49 am »
like kevin said, change it to use dip instead of CMOS, its the free-est easiest fix. After you do that, let us know if you can play.  The game over screen is a hilarious slap to the face.
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