Vigilante repair

I received this board knowing nothing about it apart from the fact it didn't work, so first I look for the pinout online thinking it was prejamma for some reason but no there it is printed right on the edge connector JAMMA. That saved me some time, anyway on power up I see a screen of blocks much like in the Kung Fu Master repair and it was playing every sound one after another.

I fired up the trusty boardmaster 4000 it flagged both Z80 cpus and some near by 74LS245 buffers as faulty. It was unlikely that all four chips were bad, the boardmaster can give false readings but I decided to remove and test the cpus first and add sockets if I needed to use the fluke 9010a at all later.

It turns out I should have tested the 245s first as both cpus were fine and a quick check with a logic probe it was obvious both 245s were bad.

 
The game now boots up and works perfectly apart from the repeating and constant sounds. I checked the 74LS245 in the sound section with the logic probe and it didn't look right. I then piggybacked a good 245 on top and now the sound works 100%. I replaced the 245 and the repair is complete.

Looks like a bad batch of 74LS245s, maybe something to look out for on other faulty Vigilante boards?

Sorry about the lack of pictures I didn't have the camera to hand this time.