Professional software development, amateur BMW tinkering, old arcade game stuff


Technos Renegade arcade PCB repair

Renegade is a JAMMA pcb and the predecessor to Double Dragon.  Initially it seemed the vertical sync was broken on this board – the image rolled vertically very fast.  I traced the sync line from the JAMMA connector back on the top board and found it goes to the bottom (video) board.  After cleaning up a lot of dirt and dust, a massive gouge in the bottom board became clear!  Must have been a fairly heavy impact as you can see two TTL pins are sheared clean off.

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Bridged the broken traces with wire and sync was restored but the image was cut into three pieces.

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Re-checked the repair with a logic probe and found no activity on one of the repaired traces.  There was actually a through-hole to the other side of the pcb in the damaged area that need soldered back on the trace.  Then everything worked 100%.

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