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Macintosh Portable M5120 Repairs


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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?

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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.

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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!

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  • 1 month later...

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...

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  • 6 months later...

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!

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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.

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  • 2 months later...

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!!!

post-9156-0-81537400-1493204771_thumb.jpg

Edited by pfoff
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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!

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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.

Edited by 360alaska
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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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  • 2 weeks later...

Yeah, I recaped my portable successfully. It runs great now!! I only have to remaining issues.

The first one is, that I got a rom card and a RAM expansion card with the machine.

Now I can't get neither of them to work!-( I attach pictures so someone might be able to tell it they are the right ones and how to set the dip switches. I only found docu for the jumpers on some system, but they don't seem to match, if I select external rom, it won't boot at all!-( And the memory is always 1M, no matter if the card is inserted or not.

Second is a dark small corner on the display. It tends to get bigger, when I use it. Maybe even the display should require some recapping service?

Great machine, it was really hard to recap it, but it runs great now, with 1m of ram, though....

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post-9156-0-83556500-1494104970_thumb.jpg

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So, I'd trade those Ram cards, I have no Portable with backlit!-(( Need Ram upgrades for my M5120 than, anybody out there?

I have a problem with mine. It runs flwalessly after recapping, but not of the battery. It charges the battery, but does not use the power of it to run. Only runs with ac connected.

Any ideas? I will have to take it apart and look after that. Man that machine is really uncommon in many aspects. Love it. This's to(or from) the crazy ones!;))

Really no way to reactivate the tunneled screen? There doesn't seem to be spare screens available.

Thanks for all the help here!

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  • 1 year later...
On 6/3/2016 at 5:00 AM, techknight said:

someone apparently hasnt read just about EVERY other portable thread here.... 

 

IT NEEDS CAPS. CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.

 

Lets try again shall we... 

 

CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.CAPS.

 

Sorry. Maybe hopefully I get my point across. Oh BTW you DO NEED a good battery as well. the portable is not designed and WILL NOT properly run without a battery. 

 

Now that those 2 things are out of the way, any questions? 

what about the SMD cap do I need to change them to?

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