imactheknife
Well-known member
So i guess I will be an owner of a portable now lol.. with my powerbook 100 working, i got s good deal on a portable for $175 cdn. Will see what it is like when i get it… here is a snap
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Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.
So, I bought a portable…
- Thread starter imactheknife
- Start date
imactheknife
Well-known member
Anything to look out for!? I will open up and recap. He said it did work, but not now. Hope cap’s didn’t do any major damage
3lectr1cPPC
Well-known member
I'll pray to the HYBRID gods for your sake! Good luck getting it up and running again 
imactheknife
Well-known member
Thanks! Hope it can be saved. $175 isnt bad if it can be restoredI'll pray to the HYBRID gods for your sake! Good luck getting it up and running again
imactheknife
Well-known member
Ok, i am sure 3lectr1c has them on his site too.. will check
3lectr1cPPC
Well-known member
Non backlit caps: https://macdat.net/cap_reference/apple/powerbook/portablem5120.html
Backlit caps:
macdat.net
Backlit caps:
Mac Portable M5126 Cap Reference - MacDat
macdat.net
3lectr1cPPC
Well-known member
Thanks for the values, I needed to add those. Are these only present in the backlit version?
imactheknife
Well-known member
Awesome, thanks so much!
Congratulations - I guess you’ll be making a new battery to turn it on with
I’m sure this is probably written elsewhere but…all three non-backlits that I’ve worked on have needed the Hybrid module replaced. Symptoms are: only powers on when the interrupt and reset buttons are fiddled with, hard drive doesn’t spin up or machine resets when use of the floppy drive is attempted, and won’t charge the (new) battery.
I suggest the reproduction hybrid module from user ‘supersvga’ on eBay (and in this group too I think) I fitted one and everything worked straightaway - wished I’d replaced it first, hence this post 
I was really impressed by the quality of the item.
I’m sure this is probably written elsewhere but…all three non-backlits that I’ve worked on have needed the Hybrid module replaced. Symptoms are: only powers on when the interrupt and reset buttons are fiddled with, hard drive doesn’t spin up or machine resets when use of the floppy drive is attempted, and won’t charge the (new) battery.
I suggest the reproduction hybrid module from user ‘supersvga’ on eBay (and in this group too I think)
I fitted one and everything worked straightaway - wished I’d replaced it first, hence this post I was really impressed by the quality of the item.I would recommend replacing the hybrid as well, even as a preventive measure. Bad hybrid might send >6V to the AD converter of the Power Manager chip, which fries it (and the only source is another Portable or PB100). Based on my M5120 with two units, I suspect hybrid modules are actually the major cause of dead PMGR ICs.
When fixing my M5120, I've tried to wash the hybrid with IPA multiple times to get rid of the cap goo, but it never worked properly and did some funky thinks with voltage rails. In retrospect it was an unnecessary risk given the reproductions are available.
When fixing my M5120, I've tried to wash the hybrid with IPA multiple times to get rid of the cap goo, but it never worked properly and did some funky thinks with voltage rails. In retrospect it was an unnecessary risk given the reproductions are available.
3lectr1cPPC
Well-known member
Did your unit have any cap leakage, or was the board in pretty good shape when you got it? To my understanding, the Hybrid's on-ceramic resistors get corroded easily by the caps next to them and cease to output the correct resistance, causing the module to fail. If I'm correct here, just about any hybrid that hasn't been exposed to cap juice should still be fine, in theory.
Of course now, the number of systems that fit this criteria is few.
Of course now, the number of systems that fit this criteria is few.
LaPorta
Well-known member
Oddly it wasn’t as great as you’d think. I was lucky it didn’t get burnt out by the PB1xx power adapter is used before it was common knowledge that that was very, very bad. It eventually stopped working due to cap leakage. When I started replacing the caps, I ran into issues with screen issues and sound glitches. Even today there is the most faint background hiss at the highest volume, due I think to some microscopic residual cap goo inside the board. Techknight helped me work through the worst of it. Here are the threads from back when:
68kmla.org
68kmla.org
My Portable is up next...
Hey everyone, After completing my Mac II, now I am turning my efforts to my Mac Portable. Over the years it slowly stopped working (bad caps, no doubt), and I am setting out to get it going again. First, I am looking to make a stealth battery...namely, a new lead acid cell in the original's...
68kmla.org
Portable contrast lines
Hi everyone, Attached is the video of what I have been describing. Rolling lines upwards when the contrast is adjusted. I recall this happening over 17 years ago when I first got the machine, so it’s not due to anything I have replaced recently. I’m not sure why this occurs, and it is worse...
68kmla.org
3lectr1cPPC
Well-known member
Hm. Could have just gotten lucky.
