Purchased a bootleg pcb of bombjack recently from a member, it was sold as not tested, anyways here it is on my work bench. 
It appeared in nice condition with no parts missing also included was the jamma adapter and rgb harness, right let's fire it up.......
Well it powers on to a black screen with no image and no sound, next I made a closer inspection of both boards to see if any traces were broken or loose eproms, everything looked fine until I looked at the rgb connector,according to the schematics there should be a common gnd and and video gnd crimped to it which was missing?
The jamma card looked very poorly soldered and so I decided to replace and completely do the card and harness.
That's more like it ,right now let's fire it up.......
Cool 😎 bombjack is alive and we have sound and working controls but there's an issue with the foreground tiles and I worked out there are 3 roms which stores the data.
Started to scope all the data pins and as I was checking the foreground tiles graphics returned to normal, by wiggling one of the roms the tiles messed up again. I removed all three roms and their sockets were single wipe and these are usually crap and not reliable, fitted new sockets and refitted the roms and...
Ooooooooo yes it's now working properly, another one saved.
It appeared in nice condition with no parts missing also included was the jamma adapter and rgb harness, right let's fire it up.......
Well it powers on to a black screen with no image and no sound, next I made a closer inspection of both boards to see if any traces were broken or loose eproms, everything looked fine until I looked at the rgb connector,according to the schematics there should be a common gnd and and video gnd crimped to it which was missing?
The jamma card looked very poorly soldered and so I decided to replace and completely do the card and harness.
That's more like it ,right now let's fire it up.......
Cool 😎 bombjack is alive and we have sound and working controls but there's an issue with the foreground tiles and I worked out there are 3 roms which stores the data.
Started to scope all the data pins and as I was checking the foreground tiles graphics returned to normal, by wiggling one of the roms the tiles messed up again. I removed all three roms and their sockets were single wipe and these are usually crap and not reliable, fitted new sockets and refitted the roms and...
Ooooooooo yes it's now working properly, another one saved.
