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Catzoo

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Oct 1, 2018
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Hello,

I'd like to share with you today my first repair log, starring Demon’s World (Horror Story), from Toaplan (1989)

Sold as "working" (meh), the seller was at least right on something : "sold with dust" - Yeah that was sure right. It's filthy as hell, and will need a deep cleaning.





First, i couldn't resist booting the game "as is" to see what's going on. The boot time seems a bit long, with weird lines moving around the screen (invisible on picture but was obvious in person), and sprite bugs, as you can see :





Now let's get started : cleaning.

I remove every socketed eprom, and took a picture to remember how it was.




To clean this PCB, i used Isopropanol with a small cloth, and antistatic brush.

After two hours of rubbing :



Way better ! Now let's end this with an air compressor :



Shiny ! Now let's jump to the hardest part : fixing the game. I've noticed two things : one resistor had a broken leg, and one cap is lifted.



I resolder the broken leg, and replace the capacitor. I plug back every eprom, and try the game : normal boot, no more weird vibrations, but still that sprite bug. Damn.

While i was cleaning it, i've noticed that one trace was damaged :



I grab my multimeter and bang, no continuity there. I used a wire to bridge it, and clean my flux with Isopropanol again. Probably not the cleanest job but hey, that's a first time :



I double check continiuity, everything's fine, so now that it's dry, let's plug it ...



Game's fixed ! Ready for more demon slaying :D
 
For sure it's an easy one, but i'm learning stuff everyday, i hope at some point i'll be able to post here new repair logs with some advanced technique :)
 
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