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Home Forums 68kMLA getting rid of the jailbar pattern — #9
Post #9 by sbreit
Source Forum68kMLA
CategoryTroubleshooting
Post DateTue, 17 Apr 2012 - 20:02
Original URLhttps://68kmla.org/bb/threads/getting-rid-of-the-jailbar-pattern.25160/
Post
Hi!

We just hooked up a logic analyzer to te PCB, turns out the shift register seems to be toast. The inputs VID(0) to VID(7) are all fine, while the output lacks 2 bits. Also, the IC itself looked a bit battered. I'll have it replaced, we'll see then... :)

The pattern is 11111100 by the way. I also thought it was 11101110 at first :)

Regards

Steffen

mp.ls