Dec 252014
 

Got this original Super Pang PCB from my friend ‘Mikidaffy1983’

Super_Pang_PCB

He asked me to desuicide it (picture above is actually from the board already desuicided) and, as usual, I followed instruction here:

http://www.arcadecollecting.com/dead/pre-cps.html

All went good but when I tried the board I noticed wrong colors on some backgrounds/sprites:

Super_Pang_issue

Studying a bit the hardware I found that the color RAMs are located @8C and @9C (two 6116) so I started to analyze them with my logic probe, this revealed that some data lines of 6116 @8C were inactive.Desoldered and tested it out-of-circuit confirmed it was bad:

6116_testing

Fitted a good 6116 RAM brought colors to normal.

Super_Pang_fixed

 Posted by at 8:37 am