Another board from the ‘portughese’ box : Tatsujin Oh, a great shoot ’em up released by Toaplan and known outside Japan as Truxton II.
Board was booting but sprites were mostly missing and other GFX glitches present too:
There was an obvious reason of this.The custom ASIC ‘GP9001’ (which is the graphics controller of the system) was damaged : some pins were missing, other bridged, two traces going to it were ripped too.
Here’s a close-up under a microscope:
Given the extent of the damage the only possible solution was the replacement of the ASIC which is a very delicate operation (not for everyone…) because of its package (208 pins in a QFP package with very fine pitch).For this purpose I’ve been sent by the owner a dead FixEight PCB as donor:
I removed the damaged part and cleaned the area preparing it for the trasplant:
The spare removed from the donor board :
After soldered it I took care of rebuilding the ripped traces using some AWG30 wire :
Testing was successful, board 100% fixed.
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