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likanen

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  1. likanen

    Macintosh Portable inconsistent 5V+

    If I only had one Anyways I found the problem (I had accidental dropped solder on a memory chip, it is visible on the logic board picture above) and the computer now boots to a flashing disk screen. The HD is marked as bad, and it didn't do much than whining when attempted to start it up. Regarding the PSU there is a long thread from 2011 to 2013 discussing about it. I know the thread is old and more knowledge has been gathered, should one use 2/3A PSU or no?
  2. likanen

    Macintosh Portable inconsistent 5V+

    Hmm, did some trials and it seems that the computer starts up (almost) every time if I plug in the battery first. It doesn’t boot up with charger only (I guess this is expected) and I need to RESET + NMI it to get it to boot if I plug in the battery after the charger. So... most probably it works from power mgmt perspective and the sad Mac is because of a bad trace etc.
  3. Hi, I would appreciate some guidance... I recapped "recently" (like year ago or so) acquired M5120 and plugged it in for the first time. I got a chime and a sad mac. While trying to make it easy to access the board while powering it, it did a smoke on pin 10 on J22 (yes, it is a ground pin but the Portable case is conductive, so it touched something else where). Anyways, searched through the forum found out that pin 3 on Q4 should give you ~5.2V. I get 5.15V sometimes (usually after a small break without a charger and with a charger from PB 165c, 3A) and I can get it to chime again. Most of the times I get 0 (on battery) or 1.3 (if charger is plugged in). The charger gives 7.6V whenever I've measured it and possibly even charges the battery (or at least I've seen it increase from 6.3V to 6.36V but it might also be the battery recovering). I have used IPA and a brush to clean board where necessary. I've never cleaned my boards by washing so if that would be the next course of action, how do you wash them? With plain water and a brush and do you use regular household oven to dry it? Also suggested on the forum is to use flux and heat station on Hybrid, I don't currently have access to a heat station so can't really try it out. Pin 3 on Q16 and Q20 gives either 7.6V if on a charger or 6.3xV if on a battery. I guess that is correct. Pin 1 on Q16 is around 3V. Pressing RESET + NMI does not change anything on the 5V (so it stays the same it was prior pressing them, be it 0, 1.3 or 5.15). Thanks, Harri
  4. likanen

    Is it a Lisa????? Is it a Macintosh????

    Please find attached some more pictures. The power supply is with AT connector and has been attached to the Lisa monitor power in. Then Lisa’s video / logic board connector is sliced and a regular Mac compact connector has been connected to it. I know nothing about Lisa connectors so my assumptions might be totally wrong. That scsi cable is interesting. There is no scsi in 512K so it might be this has been used as test bed for fixing compact logic boards. Does someone know what is that stick with three wires?
  5. likanen

    Is it a Lisa????? Is it a Macintosh????

    He used Lisa shell for it.
  6. likanen

    Is it a Lisa????? Is it a Macintosh????

    I will. There are 4 other compact macs and various analog and logic boards so I’ll try to sort them out first. That stacked memory logic board just stroke as was it couldn’t fit a compact case so asked the guy how he had been running it.
  7. likanen

    Is it a Lisa????? Is it a Macintosh????

    The board is 512K but here is the photo.
  8. likanen

    Is it a Lisa????? Is it a Macintosh????

    Sorry to revive this 5 years later but I obtained a similar 128K board with a stack of ram. The lot also included empty Lisa case with non-standard PSU in which the board had been. The seller had modified the board and Lisa by himself (afaik) and he used to work at it department of a local university. I haven’t tried it out but if there are some questions you’d like to ask, I can reach out to him.
  9. likanen

    SE/30 recap issues

    Finally, I can report a success (I hate when people don't finish a topic they started, if it got resolved or not). Sound and ? floppy. The sound problems I was able to find a potential cause from here: And it was indeed a broken data line to ASC (among many others ). Funny that the trace looks fine (no black rot) but doesn't work between the UJ11 and the first test point. I even removed the (previously replaced) caps C9 & C10 to check the trace underneath. For me, the most surprising thing was, that once audio started to work, the ? floppy appeared as well.
  10. likanen

    SE/30 recap issues

    Thank you @Bolle, I found UC8 pin 13 not connected. After fixing the A(11) connection the picture looks good (I guess I could have taken A(11) closer to UC8 ). The programmers button still produces same error code (0000000F,00000013), I've lost whatever sound I had (some beeping), and no ? floppy. Further guidance is appreciated.
  11. likanen

    SE/30 recap issues

    Thanks! Is there a chart where each should be connected or how should I test the lines? I tried searching the forums earlier but I couldn't find a chart.
  12. likanen

    SE/30 recap issues

    Spent couple of hours cleaning the board even more, adding jump wire for C6, found that trace between circled leg and and its other end is broken, jumped it. Anyways, no change in out come except some attempts to play something from audio but it also fainted away after few resets. I also realised I get sad Mac if I press the programmers button.
  13. likanen

    SE/30 recap issues

    Hi, I recapped recently obtained SE/30 with simasimac issue. Only mouse cursor and the horizontal black stripes. After recapping nothing actually changed, so I took out the multimeter checked the connections and found that my C1 is shorted to ground on - and + gives resistance of 100 Ohms (?). Other than that and C6 not connected to UB11 pin 7 (which I think can be easily jumped) I didn't find anything wrong with the connections. My question is where I should start looking for fixing the C1. Cheers, Harri
  14. likanen

    Picures of DOVE MacSnap boards

    Hey, I have a MacSnap 5.0 with a RAM error when booting up. 080030 if I recall right. If the MacSnap is removed, the Mac 128K works. Has anyone replaced the RAM chips? The say 8725C, V51C256P15L on them. I can't find exact same from anywhere but can I use something different? Finally does someone know how to determine which chip(s) has failed from the error 080030? Thanks!
  15. likanen

    PB180c screen after recap

    Uh, I restarted the laptop 12h later and the lines were gone.
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