TheoryBoy, I certainly appreciate your kind willingness to ship me some replacement chips. But since you mention that your board would boot, even before you replaced the video chips, it is unlikely they would work on my board. My SE/30 logic board won't boot at all. No chimes either. I switch on the Mac and those horizontal lines appear, and there is no disk drive or any other activity in the machine. And again, I replaced my caps (every single one of them) on this machine, so I know it can't be that. And since I have another SE/30 logic board that works fine with that analog board and CRT, I know for a fact it's a problem with the other logic board only, not a problem in any other area of my machine.

Sure wish I knew the root cause those. For in the past, this particular logic board worked fine. And then one day I connected it and it had those SimasiMac-like horizontal lines at cold boot. (But the machine won't boot.)

I even bought a TechStep off EBAY to diagnose the problem, but since it won't boot or show anything other than the horizontal lines, even the TechStep cannot assess anything other than the voltage (which is within spec, by the way).