I got this board from a guy who said it didn't work right and he was going to through it out. I got him to send it to me. He messed up and put it in a tyvac envelope, and when I got it the ROM SIMM socket was broken. Six of the eight RAM SIMM sockets where broken too. I thought oh boy, what a mess! And I set it aside. I got replacement SIMM sockets off dead LC boards, and a ROM socket off a dead cx. I removed and replaced the bad sockets, and replaced all 11 caps. The board would not boot properly. After mucking around with it I figured out that if I lifted the corner of the board near the printer port the board would boot. Then I knew I had a cracked solder joint or broken run somewhere on the board. If that's not bad enough the board would not see a internal or external SCSI drive. But it would boot from a floppy. Also it has fine vertical lines, Like the jail pattern only narrower. I reflowed most of the SM (surface mount) parts on the top of the board. No luck. So I turned the board over and reflowed all the SM parts and all the TH (through hole) parts. The board was pretty sticky from the flux I was using, so I washed the backside. And dried it with compressed air. That solved the cracked solder joint problem. And the fine vertical lines sort of flickered out. It would still not boot from a internal or external SCSI drive, but it would see the drives and access them. So I washed the topside and dried it with compressed air. I let it dry overnight. This afternoon I turned it on and it booted from the internal SCSI drive, but the fine vertical lines where back. Rats! As the board warmed up they went away :oD and as the board warmed up more they came back :o(. My question is what would make those lines? johnsn
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