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Sega Afterburner arcade pcb repair

Game ran but sprites were garbage – bad positions and lots of corruption.

_ab1 _ab2

I ran the self test before doing much more – and it came back with bad custom IC30.  This is actually a math coprocessor, and the main CPU uses it for maths to position all the sprites in screen space – so if it fails sprites will be corrupt.

Luckily I had a spare for this chip from a Thunderblade parts board.  Game was perfect after I swapped it in.

_ab4 _ab3 _ab5

 

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