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Looks like we have another one with video issues. As far the instability of the machine and the random crashes/freezes: this can be caused by a poor recap job or by faulty ram. I've seen Macs crashing with bus errors, bombing, freezing,... due to faulty ram. I had a similar issue with my Mac...

All external Apple CD-Rom drives are unterminated so you have to use a pass-through terminator in order to get it working. SCSI ID of the internal hard drive is by default 0, I would be surprised if anyone would have changed it in the powerbook.

The CRT is pretty easy to replace. Anyone from another B&W Compact Mac will do the job. In the Classic I/II there can be a small compatibility issue with the yoke connector as they used 2 versions. However if the deflection yoke connector of your replacement Tube is different, just mount...

Have you verified all the traces that run between the Ram chips ? A broken trace can also give these Sad Mac ram errors.

There are 2x rows of small radial caps at the back of the LCD panel that need to be replaced. It's a fiddling job as there's very little room. If you have recapped the LCD and logic board but it still doesn't work, have a look at the PCB with the brightness/contrast pots. I can't recall if...

Don't forget to recap the LCD panel as well. All SMD capacitors on the back of the panel are shot. This will sort display issues like over- or under contrast and unstable screen. The hard drive issues: Most stock powerbooks 100 I've seen have the Connor 20MB or 40MB hard drive. These suffer...

First check if the Bourns filter is bad before attempting to replace it.

The external drive he used is a Unidisk model suitable for Apple II series and Macintosh. The difference between the external 800K drive for Macs only is that the Unidisk model has an extra PCB between the cable and the floppy drive. It could be that the FDD inside the enclosure or the PCB is...

I did check the traces and the ADB ports had +5 volts, nevertheless no power on.

No, I regrettably haven't been able to repair this one. My best guess is a faulty PMU or ADB Controller. These soft-start boards are very hard to troubleshoot and without any spare parts from a scrap board there isn't much one can do.

Does the Mac boot from the external FDD A9M0106 with the same disc or other known good bootable discs ? If not, slide the metal cover of the floppy disc away and look with a magnifying glass to the surface while gently rotating it: do you see any scratches, even minor one's ? It is possible...

Well it was indeed a faulty SCSI chip. I desoldered the old one with Chip Quick, put in a brand new "old stock" one I found on Ebay and the SE/30 immediately booted from it's HDD. I left it running for 12 hours and ran hourly Norton Disk Doctor full surface tests with verify on the HDD and...

Are these matched sets of 4x identical modules ? Mixing different modules with different speed or other chips in the same ram bank often gives unpredictable results. The longer boot time with 4MB is normal, however it's not taking minutes, about 20 to 30 seconds I suppose. If you have an...

Use 8 or 9-chip ram modules only in Compact Macs. They are the safest bet. In some models, the 2 or 3-chip modules work but they often cause a lot of problems. From personal experience 2 and 3-chip modules often give issues on Plus and SE boards going from not posting to being instable.

I'm thinking of a faulty deflection yoke, there can be a short in the coil. Have you tested it or do you have a spare around from another Compact Mac ? You wrote you had recapped the Analog board: did you replace the film capacitors too including the small red one's ( above the brightness knob...

I'm well aware that ESD damage isn't visible from the outside ! What I wrote is that the board is dead and has no visible "Outside damage" while examining is thoroughly so probably one or more IC's are dead, which can be caused by ESD. It's one of the cleanest SE/30 boards I have had in my...

Here on Ebay Belgium, UK and Germany, there's very little vintage Apple hardware to find. Like you say, if a Compact Mac comes for sale, it's a complete one. Parts are almost impossible to get here in Europe, Ebay USA is better but things like an SE/30 logic board is very rare. We could use a...

I agree 100% that chances are thin to find the cause and it will take hours of testing traces, then again it's not even sure there's a problem with the traces. The only problem is: who is going to sell me a working/repairable SE/30 board ? A while I go I asked one in the Trading section and...

Even without the Video Rom and Rom Simm, an SE/30 typically shows horizontal lines ( so fake Simasimac ). It's probably a broken trace somewhere or a dead CPU as the board really doing nothing. However there are so many traces to check if one wants to test the complete video and power circuit...

The Mac portables LCD's are regrettably known for dead pixel lines. I have replaced many of them but they don't tend to last long. I have given up as these LCD's are hard to get and very expensive on Ebay.