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Found 14 results

  1. My friend asked me to fix up his old Portable and I'm giving it a shot. Done capacitor replacement jobs before (several), and replaced the capacitors with very few issues. There were a few traces where the cap goo was clearly under the soldermask, so I scraped off the mask, cleaned up the goo, plated with solder, and then covered with new mask. Things generally look good, though I haven't done an ultra-close inspection on the entire board. Some pins on the video chip (top center pins) needed rework because of corrosion, and a few other things here and there like those tiny transistors.
  2. So I got an original M5120 Macintosh Portable a few months ago. It was listed as non working, but after a recap it would turn on again fine. The real issue was the hard drive. It was impossible to make it work. It would keep the Macintosh on a permanent rebooting loop. After doing a couple tests (that actually made it worse) I finally gave up and went for a SCSI2SD with an adapter. As a keep-it-original hooligan, the main drawback here was not only that the lack of noise from the hard drive felt strange, unexpectedly quiet, but that it made you feel other noises that normally would
  3. Hi I’ve recapped my M5120 and it has sad Mac now. It works previously before capping. I’ve check both battery and power adapter that’s working great so power shouldn’t be the issue. It chimes but has the error as shown. Also swapped out the ram but it’s the same. Any help?
  4. After recapping my M5126, it works however keyboard is acting weird, here are the findings. 1. number 3,4,5 and 6 is not working. 2. alphabet U and D will cause system error. however I tried - changing keyboard - switch over to RHS with mouse - changing keyboard ribbon cable all doesn’t works. however external ADB keyboard will work perfectly. checked C116 Caps and the connectivity is correct. It was working well before recapping. what could be wrong? I’m short of this step to have a perfect M5126. anyone has
  5. Ok long story short, I connected the battery in wrong polarity, after I found out I was wrong I switched back. The portable still powers up but unable to run scsi HDD nor charge the battery. I think one mosfet could be blew but I’m not sure which. When I plugged in adapter and battery, voltage tested at battery point was 6.33v. If I do this on a working M5120 it reads 6.9v so I’m presuming the power couldn’t charge the battery hence not giving enough power to run the scsi HDD too. Can anyone enlighten me which mosfet or which component is affected?
  6. Good morning everyone from spain, I have restored a 1989 portable macintosh, model m5120, it has been recped, cleaned and baked following the teacher's instructions techknight. But I still do not work 100% perfect. I tell you the problems he has to see if you can help me: The first problem is the screen, after half an hour of use more or less it begins to darken until it becomes completely black; If I turn it off and leave it off for a long time, it returns to normal. I've checked the capacitors and they seem fine, I don't dare to disassemble the frame and I don't know what to do. I leave
  7. I'm having a weird issue with the audio in my portable, it often starts to "chirp" for lack of a better term. sometimes it's a continous chirping sound, sometimes it's random chirping and buzzing. And sometimes it's completly quiet unless it's supposed to make a sound. The chirping will usualy mean the system is not running stable, so it will randomly crash if a sound should be played or a floppy it accessed. I've tried to use the system without the harddrive, but the problem remains, no floppy drive, the problem remains. Disconnecting the speaker didn't help alwell (although
  8. Dear Mac enthusiasts, Finally I could figure out what was wrong with my Mac Portable backlit model and I brought it back to life yesterday afternoon. Not a really big deal, just a broken path, but it was under a chip, so it was quite difficult to find. Anyway, now that it works fine I have a couple questions: -First: when should the screen backlight turn on? I thought it came on at the same time I turn the computer on, but for some reason it doesn't until it loads the first extension. I don't really care, as it works perfectly fine, it's just curiosity.
  9. The flaky and stripy video was a broken 26-pin LCD monitor cable. Has anyone had this problem, and how was it fixed? Where would you find this kind of cable today and what is it called?
  10. Hello, I know that there is much discussion around the Mac Portables and their woes with powering up. So much information, in fact, that I have become lost in it all and have no idea where to start. So, if I may, some simple questions, and some directional guidance required. I have several of these beasties and they all do not seem to start up. Some don't boot at all, some boot then power off, some boot, show a mouse, and the drive tries to spin up then shuts off. One I had boot and went straight to sad Mac. It even ran off the replacement battery that I had in it (6v 5maAh le
  11. I just got a Macintosh Portable in the mail today, and I was told it boots to a floppy disk screen. Turns out, that wasn't true. It doesn't even boot at all. The startup is very erratic, sometimes doing one thing and other times doing another. It will sometimes: - Boot to the mouse cursor, but then the screen flashes and glitches. - Boot to the zebra stripes, but become caught in an endless loop of booting. - Boot to the zebra stripes, but then display a Sad Mac with error code 00000012 0000CD36. A little while after that happens, the screen begins to flash and glitch while the flopp
  12. Hello all, It’s been quite a while since I’ve posted here, and it’s good to be back! I had a quick question for you Portable people out there: I just recently recapped a clean-looking backlit model, and it seems to be working fine off of my bench supply running at 6.8v. The problem is, lowering the voltage to 6.7, 6.6, or 6.5v makes booting either hit-or-miss or impossible. Also, I bought a new 6V 5Ah SLA battery (not the cyclon pack) to power the system. Even after being charged up to its max of 6.6V, while connected to the original charger, the machine refuses to boot
  13. Hi all, excited to be a new member. My friend and I have been debugging a recapped 5126 lately and are looking for some advice. Once again this machine was recapped some time ago The machine is in OK shape overall with a well-behaved 40MB hard drive. Unfortunately, leakage from the three caps under J13 (left-hand kb/trackpad port) took a toll on the circuit board. We've recently bridged two pins of J13 that were attached to broken traces over to their cousins on the other side of the board. Also, I just now finished wiring the interrupt switch directly to the Misc GLU to work around
  14. So I recently acquired a Mac Portable. As soon as it arrived I took it apart, re-capped the motherboard and hooked it up to a replacement battery. Everything was going well, actually no issue at all last night. I was able to mount some Appletalk volumes and play some games, it seemed pretty stable. This morning I decided to break open the original apple battery and toss my new cell in there. While testing this configuration, I accidentally hooked up the battery with reversed polarity... I know, this was dumb. Now I'm having issues again. Here are the symptoms: 1. Will not power on at all wi
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