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Cool. I should try that with my LCIII. Although, it's tucked away right now. About a year ago it was giving me problems about powering on. Half the time it was hit or miss so I ended up cannibalized it for the hdd and floppy drive. I've been thinking about pulling it out of the closet and having...
With capacitors, it's true you can't measure capacitance in circuit. You can, however, find clues as to whether or not it's good with resistance and voltage measurements. You should see resistance across the leads if it's good, 0 resistance if it's a short. As far as voltage, you should see...
Cool, if that is indeed a SCSI to IDE converter in there you should look to see if you can draw up a schematic so we can make more of them. Being so old, it probably doesn't have any surface mount parts and would be an easy DIY project.
My LC575 has shipped. I'm going to swap the guts when it arrives. Hopefully with that working machine, I can pin point if it's the other analog board or logicboard that's bad.
I adjusted the pot until I got 12V and 5V and boom! It booted right up.
It did seem to take forever to boot off the System 7.5.3 floppy that I forgot was in the drive, but at least it works. Even the keyboard and mouse worked once it got to the Finder. I restarted it again and the screen went...
I'm reading voltage accross all the caps, so they're making contact with the board. However, I took a voltage measurement at the floppy connector and I'm only gettign 4.79V and 11.57V.
Also, if I power it up without the RAM board in, I get the slightest hint of a normal screen at the top...
I thought of that. I pulled the 2 extra RAM sticks I have on the RAM board. Instead of getting the double high checkerboard you see up top, I get this one:
Unless it's the onboard RAM that's bad.
Got my caps in. I just finished recapping the whole board. I did a god job of cleaning all the gunk off the board too. Sadly, I still get a checkerboard:
Any ideas?
I think you're talking about this one....
I'll have to see if I can find it. I don't think I have that one. I may have to find a jpg or png that someone posted and convert it.
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