2 x SE/30s: SimasiMac on one, JailBars+boot on other — #9

Post #9 by oscaracso

Source Forum	2 x SE/30s: SimasiMac on one, JailBars+boot on other — #9
Category	Troubleshooting
Post Date	Sun, 10 Feb 2008 - 11:35
Original URL	https://68kmla.org/bb/threads/2-x-se-30s-simasimac-on-one-jailbars-boot-on-other.9090/

Post

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).

hi! i think i have the exakt same problem. bought myself a mac classic II for 9$(90 swedish krowns) pluged it in and all i see is these horizontal black and white bars. i hear a blip, but it comes exatcly when i turn on the power so i dont think its a "booting-blip" then nothing happens.

i later got it open, look at the motherboard to see if anything was a little loose or something. took away the plastic cover on the analogboard(is it the name of the power board??) and then i put it all back and put in the powercord. BAM! it shortcuicute and m whole apartment whent dark.

opend it again and looked at the analog board and it where all black from the shortcircuit where the powercord goes.

then i couldnt put in the cord anymore cous it would just shortcircuit, even with the power knob off. and then after two days i tried it again. then it just worked.

but all the same. just these horizontal bars.

did you fixe yours? if you did i be happy to here how you did it.

heres a picture oif mine

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