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I have the .ini file, thanks. I just updated to the latest firmware for the BlueSCSI and so far it seem to be working better however I do need to test the machine more extensively to be able to draw any conclusions.

Good to know, not sure if there are any differences. I just tried booting from an external BlueSCSI (another BlueSCSI card) connected to the external DB25 port and the system seem as stable as running with the original hard drive. Makes me wonder if I have some settings messed up. Termination...

I think I might be on to something. I believe the culprit might the BlueSCSI and possibly an issue when it's waking up from disksleep. The machine would always lock up after a period of not using it, it would also freeze up when waking from sleep. I'm currently running from the original hard...

Bus errors in System 7.1. SWIM or PMU chip problems? RAM perhaps?

As stated above, the SCSI power is working, however I still have intermittent crashes and freezes. System 6.0.8 works the best and is almost usable, the Portable freezes when waking from sleep, mouse pointer is working but no response from Finder. System 7 and 7.1 is a real hit and miss, with no...

Replacing the Q20 mosfet (IRF9Z30) with a new equivalent (IRF9Z94NPBF) restored the lost +5 volt to the SCSI power.

The +5 volt is about 3,5 volt and the +12 volt seem to cut out as soon as there is a load. I have tried connecting the original hard drive and it also is dead. I'm waiting for spare parts (Q20 mosfet). Hope to get the parts by the end of the week and post an update here then.

The op-amp, would that be the OP-20 next to Q20? Any suggestion on a better one? Might as well swap it while i'm at it. I have ordered a few IRF 9Z34 which seem to be the direct equivalent to 9Z30. I wonder if I might have fried Q24 and/or Q25 as well, shouldn't I get 12 volt from them? I only...

Ok, I could not let Q20 be alone, the voltages just did not add up in any kind of way. Under load the Gate voltage was 5,4 volt and the Drain was just 0,7 volt. I desoldered the mosfet and did a test that seemed "off" putting the mosfet in my chinesium IC tester kinda confirmed my suspicions it...

There only seem to be trouble with the SCSI power as far as I have been able to find out. This is all a bit of a mess, on the power pins in the SCSI connector I have +12 volt under no load, but as soon as load is apply a load the voltage seem to drop to almost 0v. The +5 volt is steadily going...

Finally I got the hybrid board and have it installed. Portable started to a question mark with no error codes but there was no +12 volt going to the BlueSCSI, after some fault searching I found out that the 12 volt was likely grounded to the metal holder for the hard drive at one point as the...

Thank you for your answers! Yes, , that oscilloscope doesn't produce the cleanest signal, just a "toy osilloscope", I have a HP 16500B with all the bells and whistles but it's beast to move around. I'll wait until the new hybrid board arrives and I have it installed before I do any more fault...

Checked the voltages at Q16, they seem quite stable I am however a bit confused regarding leg 3 on Q16, i'm getting 6,2 volt on the source, i'm not an expert at reading schematics by any stretch of the imagination but I cannot see any reference to a 6,2 volt source. Film of measurements

@SuperSVGA Thank you for your clarifications of the error codes. I'll whip out my oscilloscope and check the +5volt. Where is the best place to check? Q16 or somewhere on the hybrid board? PS. I just ordered a repro hybrid board from you (?) on ebay yesterday. Even if the hybrid i not faulty...

Yes sorry I mean to link: https://androda.work/mac-portable-hybrid-pre-check/ I just noticed the linked spead sheet with a more extensive testing. Will give that a go. The hybrid chip with shipping and tax isn't that expensive compared to what I have spent on this machine in both time and...

I followed this guide and the Hybrid board passed with flying colors so that board seem to be just fine. Hybrid Board check

More error messages.

Hi! I have been looking through many threads regarding Macintosh Portable but unfortunately have not gotten any closer to a solution. Short story follows:  Macintosh Portable M5120 (non backlit) with original power brick 1MB RAM. (white/light grey).  Recapped about a year ago working fine...