- Joined
- Jan 18, 2001
- Posts
- 4,229
Long story short, shitty monitor fried my 2 slots sync. Just a rolling image now. It fried several resistors and all have been replaced, but didnt fix the problem. Any ideas?
Thanks
Thanks
NeoTurfMasta said:MKL, I cant seem to find the 74LS86 chips you mention, but I do have 2 74LS273 chips in that general area. They dont seem to have any signs of damage. Would they if they were fried?
MKL said:The LS273's have nothing to do with sync.
Just follow the sync trace until it arrives at some component: it must go somewhere and most likely it will be some OR/XOR gate. I've just checked a MV-1FZ and it's basically the same as what I said before: sync output is on pin 150 of the LSPC2 A2 (a later version of the graphic chip), from there it goes to pin 1 and 2 of a 74LS32 and from pin 3 of the same IC it goes out to the Jamma connector (with 100 and 470 ohm resistors in between). Now I don't have a 2-slot to check (sold it last week) and perhaps it will not be a 74LS86 but no doubt something similar...
Look at the LSPC, it's one of those large square chips. If it's a LSPC A0, then follow the trace that goes out from pin 126, it'll lead somewhere...
And if you can't seem to find anything post some hires closeups.
BTW, where is the DIP switch bank located on your 2-slot, near the controller port? (this would tell whether you have an older or newer board)