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Macintosh Portable M5120 Repairs

techknight

Well-known member
Caps for sure. There hasn't been a portable in existence that didnt need new capacitors. 

there is no "might not" here. trust me. Thats like saying your running a car with 27 year old oil, and the engine is rattling, and the oil "might not be the issue".

I know the portable inside and out, and I even have the apple official schematics. 

 
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techknight

Well-known member
Yep. Once you get it recapped it will work perfectly fine usually. And itll continue to work for years to come. 

 

khannonnd

Well-known member
Based on the goop I encountered in my Portable's dead hard drive, I might suggest removing the dead hard drive from the machine entirely (if you haven't already) so it doesn't leak onto the motherboard.  

 

MacMan1984

Member
Khan, this may be a little confusing, but here's the surprising part: The hard disk isn't dead. It has spun up, functioned and the computer booted off of it several times, but it can be very picky every now and then. Sometimes it works, and sometimes it doesn't. Before, the computer used to spit nonsense onto the screen and give me random Sad Mac error codes because the hard disk wouldn't cooperate. Now, it doesn't do that anymore. I get the cursor without any issues at all and the hard disk spins up. When it boots up, I get the desktop, but the computer will keep going to sleep every 10 seconds, because it says "No battery reserve power remains." Now before I have to be reminded again, I am aware that the caps are the likely cause. I have been told this several times, and I'm currently planning on having the logic board recapped as soon as possible because I acknowledge what techknight and Uniserver are saying. But I'm trying to focus on one thing at a time, because we all have a life to live here. Work, sleep, we all have a lot of other things to do along with fixing old Macintosh Portables. But sometime during this repair process, I'll see what other issues I have to fix, like the battery connection, which is probably contributing to (not the only cause of) the sleep issue. I've been using alligator clips (because that's all I have at the moment), so I'm trying to find battery terminals for both the compartment and the new battery. And if the speaker is still faulty after recapping, I'll replace that, too. Hopefully all of you will understand what I'm trying to say, and thanks again!

 

khannonnd

Well-known member
Even if the HD is still functioning, I would still recommend seeking a replacement ASAP.  As I learned, those Connor drives have a gasket ringing the edge of the hard drive that WILL liquefy (if it hasn't started already).  That goop can get on the motherboard and cause damage.

Congrats on the Portable, though!  Its a fun little machine and a great conversation piece!

 

MacMan1984

Member
Thanks, Khan. I'll consider seeking a replacement HD after the recap, but there's two main issues with getting it replaced: 1. The exact model of hard disk is very hard to find online. I know there are similar models that will work just fine, though. Problem is, though, they're expensive. 2. The screws holding the hard disk and the bracket together appear to be Torx screws, so it requires a special bit for that. But I think I have the proper Torx bit, so I will remove the bracket and check for liquid on the HD. If there is, I will replace it. If there isn't, I might be in good shape - for now. But where would I check on the HD or bracket for the liquid?

 

khannonnd

Well-known member
It is the rubber gasket that runs along the edges of the interior of the HD case.  If the gasket it is place (i.e. hasn't liquefied), I know some people here have talked about how it can be removed and a new gasket, with better rubber, put in.

 

techknight

Well-known member
If the rubber is intact, I suggest taking the drive apart and removing it, then using a REALLY tiny amount of black RTV, re-seal the can. but I mean you need a really really really fine amount in the groove. Soon as you close the lid it will smoosh out and seal. Too much, and it gets everywhere including the platters!

 

aplmak

Well-known member
Keep in mind some of the hard drives have these black rubber bumpers where the head hinges on.. they turn to goo too I found.. Some drives have clear type ones and those have lasted fine.. but the ones with black bumpers have gotten gooey... this is besides the rubber gasket holding the cover over the drive. Sorry I don't have a picture...

 

MacMan1984

Member
Guess what guys - an update! I just mailed uniserver the bare motherboard for a nice, good, soothing re-cap! Yes, after all this time, I've done it! But there's a reason why it took half a year to do this. It's because we didn't have the time or money to order uniserver's fantastic service. We've been VERY busy, and had to put the project on the back burner for a while. But recently, I managed to successfully take the Portable apart, (without breaking anything) and remove the motherboard.

It's currently on its way to uniserver's workshop, so it should be there by Wednesday. But before I say anything else, let me tell you this. The reason I started this thread in the first place was because I was trying to fix a very specific issue with it - the glitching screen and buzzing hard disk. I did my homework, searching high and low across the forums and the internet and found nothing. That's way I started this thread in the first place. I thought it was just a connection or battery issue, but it turned out that the caps were the issue (which I hoped that wasn't it!). Fortunately, that issue will be behind us, as my Macintosh Portable will begin a new life!

I thank you all for helping me along this rough, rocky road to the finish line! There was a little quirk in the beginning, but now this is mutually understood. If it wasn't for uniserver's outrageous re-capping service, many Macintosh Portables would have never seen the light of day again! Again, thank you all, and a special thanks to uniserver for being very skilled in the field of computer repair!

 

just.in.time

Well-known member
Congrats.  He recapped my Portable as well and it came back running great.

This is a good case study of why any Portable should always be recapped.  The symptoms don't always match from one machine to another.  However, at this point a working Portable is worth a couple times what a recap job costs, so it makes great sense from an investment standpoint.  Additionally, leaking caps have a tendency to eat through traces below them.  Not nearly as fast as a ruptured PRAM battery, but quick enough for "hmm, this doesn't work I'll store it in the closet for a year or two" to go from a simple recap job to hunting down rotted out traces.

On that note, I just received the capacitors order i put in with trag to recap my CC, LC520, and LC575 logic boards, despite the fact they seem to work 100% right now.

Some machines have a great track record of NOT needing new logic board caps (the Plus and SE come to mind).

Other machines will almost always need new capacitors (for example, the Portable and SE/30).

I think over the next 5 years or so we will see a lot more machines from the early to mid 1990s joining that needs new capacitors list.

 

pfoff

Member
Sorry for hijacking this thread. But it seems a lot of competent people keep reading here. So I try to add my question and hopefully some of you guru guys will help me out.

I have my MacPortable ready for recaping, when I saw that little bugger mosfet near the videoport(btw is it standard vga?). And it looks not really healthy. So I decided, that I will have to change that one also. The writing on it looks like:

IRFR I(diodesign?)

R9020

B$ 5H

See the image. I can find some info about it, but I can't find it here in germany from any reseller, so my question is can I replace it with a more common one? And if so, which ones would match? It looks like it's a 50v 9.9A mosfet, so would any of these work?

Another question is about the expansion cards I have. There is one expansion ram and one rom card. If I pull them out the machne runs with 1meg and if put them in it also shows 1meg, where to look here???

I am reading here since a couple of years and it was so much help to me, I just have to say thanks to you all!!!

DSC_0047.JPG

 
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pfoff

Member
I see, so for sure somebody tried it anyway and fried the Mosfet this way. You know of an alternative replacement for it?

 

MacMan1984

Member
Another update - there's a small(-ish) quirk with my Macintosh Portable. Recently, I reassembled the computer after I got the recapped motherboard back some time ago, and fired it up with a fresh battery. And guess what happened? Flashing screen and buzzing hard disk. Again. I just don't know what's up with it. The machine was indeed recapped, but it did the same thing it did in the beginning, this time with loud and crisp sound as a result of the recapping. One work-around to getting it to boot up is to plug the power adapter into the computer before the issue occurs on startup, and then it boots up and works. But after that, if it tries to make a sound when I'm changing the volume, there's an alert or if I'm playing a game, it crashes and goes back to the flashing and buzzing. Any way to fix this? Thanks!

 

360alaska

Well-known member
Sorry for hijacking this thread. But it seems a lot of competent people keep reading here. So I try to add my question and hopefully some of you guru guys will help me out.

I have my MacPortable ready for recaping, when I saw that little bugger mosfet near the videoport(btw is it standard vga?). And it looks not really healthy. So I decided, that I will have to change that one also. The writing on it looks like:

IRFR I(diodesign?)

R9020

B$ 5H

See the image. I can find some info about it, but I can't find it here in germany from any reseller, so my question is can I replace it with a more common one? And if so, which ones would match? It looks like it's a 50v 9.9A mosfet, so would any of these work?

Another question is about the expansion cards I have. There is one expansion ram and one rom card. If I pull them out the machne runs with 1meg and if put them in it also shows 1meg, where to look here???

I am reading here since a couple of years and it was so much help to me, I just have to say thanks to you all!!!
FYI: THAT'S NOT VGA! Plugged my portable into VGA once before I knew that and I started to smell like it was burning...It still works perfectly though.

 
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techknight

Well-known member
Dont need to change the MOSFET, it powers the adapter that plugs into that port which you will never have or find. Wouldnt worry about it. 

 

pfoff

Member
Great to hear. So I can go on with the recap and fix this one, when it got to me(needs two weeks, if it hast to be that one). I tend to do it right !-)

And I found the pinout for such an adapter, somebody bult one?? It should not be to complicated, and my old grayscale monitor should work with the signal, as far as I understand.

But thanks for the answer, I'll go ahead and order the caps right away!-)

 
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