astrodan88
King's Dry Cleaner
- Joined
- Feb 19, 2008
- Posts
- 392
I'm hoping someone here has some experience with cps1 and can offer some advice.
I just bought a lot of several cps1 boards, many of which were non-working or had problems. I've tested them out and swapped out a and b boards with known working boards to try and isolate problems. After pairing up the working stuffs, I'm still at a loss on the rest. Here it goes:
First:
Does anyone know of if there is any info out there about which cps1 games have interchangable A boards? I know most can be swapped, but not all, IIRC. Can any one shed any light or confirm?
Second:
I have a Mercs board and I get no picture. I originally got no sound but after repairing a visibly broken trace on the A board I get one of the BGM selections endlessly looping but still no picture.
Mercs uses an A board that is visibly different than most (it's longer and has a slightly different component configuration; I'm not sure what, if any, are the tech differences). I swapped the B board with a known working A from a Magic Sword (which is the shorter type A) and got no sound or picture. I swapped with an A from Area 88 (which is the same length as Mercs but still has a slightly different layout) and got the same results are the original A: no picture, looping BMG track.
I have visually inspected the board and resocketed the chips; still the same. I'm guessing there's some problem with the B board but I'm at a loss.
Third: an easy one (I think):
Knights of the Round: It powers on with sound but with severe graphic problems (most of screen black; some partial sprites). I know the A board works (swapped with a magic sword B and was 100%) so I think it is a simple suicide battery issue.
I understand that when they suicide the graphics go with it, so I'm guessing that's it but I've never seen a suicide dead board powered. Can anyone confirm what a board with a dead battery would be showing?
Lastly:
I have a magic sword that shows no picture or sound. I swapped the A with another working magic sword B and got picture and sound but graphic glitches (images were doubled horizontally). When I put the the B board on a working A I still got nothing.
So, the A board works partially but there's clearly something wrong with the B board as it's giving nothing. A visual inspection and resocket yeilds no positive results.
I know that's quite a laundry list of pcb woes. My apologies. Any input would be appreciated.
Thanks!
I just bought a lot of several cps1 boards, many of which were non-working or had problems. I've tested them out and swapped out a and b boards with known working boards to try and isolate problems. After pairing up the working stuffs, I'm still at a loss on the rest. Here it goes:
First:
Does anyone know of if there is any info out there about which cps1 games have interchangable A boards? I know most can be swapped, but not all, IIRC. Can any one shed any light or confirm?
Second:
I have a Mercs board and I get no picture. I originally got no sound but after repairing a visibly broken trace on the A board I get one of the BGM selections endlessly looping but still no picture.
Mercs uses an A board that is visibly different than most (it's longer and has a slightly different component configuration; I'm not sure what, if any, are the tech differences). I swapped the B board with a known working A from a Magic Sword (which is the shorter type A) and got no sound or picture. I swapped with an A from Area 88 (which is the same length as Mercs but still has a slightly different layout) and got the same results are the original A: no picture, looping BMG track.
I have visually inspected the board and resocketed the chips; still the same. I'm guessing there's some problem with the B board but I'm at a loss.
Third: an easy one (I think):
Knights of the Round: It powers on with sound but with severe graphic problems (most of screen black; some partial sprites). I know the A board works (swapped with a magic sword B and was 100%) so I think it is a simple suicide battery issue.
I understand that when they suicide the graphics go with it, so I'm guessing that's it but I've never seen a suicide dead board powered. Can anyone confirm what a board with a dead battery would be showing?
Lastly:
I have a magic sword that shows no picture or sound. I swapped the A with another working magic sword B and got picture and sound but graphic glitches (images were doubled horizontally). When I put the the B board on a working A I still got nothing.
So, the A board works partially but there's clearly something wrong with the B board as it's giving nothing. A visual inspection and resocket yeilds no positive results.
I know that's quite a laundry list of pcb woes. My apologies. Any input would be appreciated.
Thanks!