I'll probably go back and fill in some photos later, but I'm pretty excited so I just wanted to post. Hyper Sports (Hyper Olympic '84) is an old favorite of mine, but it's not the kind of board I feel like dropping $300-$500 to get off ebay. So I waited around and happened to find a known-issues board from KLOV and decided to give repairing it a shot.
It booted, but there were clearly sprites having issues. High score data was off (the battery had clearly leaked, too). Otherwise it was good to see power was fine and a lot of logic was fine.
First, I snipped off the battery and ordered a socket and replacement.
Next , I stumbled upon a nice diagnostic tool from shoestring that identified video issues on an SRAM (c10) that is known to fail. After a short wait for some SRAM, I installed sockets and replaced that chip as well as a couple others (c9 c3) of the same type, as they're known to fail. I lifted one pad and one trace during the removal, so that took a little time to patch back up. The schematics were hand-drawn but it was enough to tell me where the current was supposed to flow.
When I booted it back up, it was worse, but different. I then went about verifying all the roms, and found five (!) that didn't verify against MAME. I re-burned them, flipped the dip switch to clear the high score crap data, and all is right with the world again. I think next time I'll verify the roms first...
So, it's not much, but it's my first repair and I learned a lot in the process.
It booted, but there were clearly sprites having issues. High score data was off (the battery had clearly leaked, too). Otherwise it was good to see power was fine and a lot of logic was fine.
First, I snipped off the battery and ordered a socket and replacement.
Next , I stumbled upon a nice diagnostic tool from shoestring that identified video issues on an SRAM (c10) that is known to fail. After a short wait for some SRAM, I installed sockets and replaced that chip as well as a couple others (c9 c3) of the same type, as they're known to fail. I lifted one pad and one trace during the removal, so that took a little time to patch back up. The schematics were hand-drawn but it was enough to tell me where the current was supposed to flow.
When I booted it back up, it was worse, but different. I then went about verifying all the roms, and found five (!) that didn't verify against MAME. I re-burned them, flipped the dip switch to clear the high score crap data, and all is right with the world again. I think next time I'll verify the roms first...
So, it's not much, but it's my first repair and I learned a lot in the process.
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You're now kind of framed, as we wanna see more 
