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#26 2014-07-24 21:51:53

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

I Figured out why they dont POST/CHIME.

Unfortunately, its bad news. the SWIM burns out. I had one spontaniously combust. Well, not smoke. but just short out. sometimes it takes hte fuse, sometimes it doesn't.

So for shits and giggles, I removed the SWIM from the dead non-backlit board and presto. it came right up. But it doesnt get past the grey screen as the SWIM doesnt respond.

So somehow, we need to find replacement SWIM ICs.

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#27 2014-07-24 22:13:07

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

really?

so you might have found the missing link?


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#28 2014-07-24 22:21:41

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

I did find the missing link.

I replaced the SWIM and its alive. Its rejecting my Disks with an X, because I think my FDD is wasted.

But I pulled the SWIM IC from the backlit board that was locking up before the desktop, so its possible that SWIM is bad as well.

Last edited by techknight (2014-07-24 22:22:30)

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#29 2014-07-24 22:23:41

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

We need to locate replacement

344S1029, or VC2982-0003 SWIM ICs.

Not sure if the desktop versions of the SWIM will work, I don't see why they wouldnt aside from the fact they may not be low power.

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#30 2014-07-24 22:24:44

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

wow…   Hel's yeah!     now, we need to assume the swim blows because they used a powerbook charger to run it, (no battery ) + bad caps...


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#31 2014-07-24 22:29:28

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

My disk was bad, the SWIM I pulled was ok. This board is now fully alive.

I watched the SWIM detonate on another board, which is how I detected it. It took the VIA with it unfortunately.

Last edited by techknight (2014-07-24 22:30:04)

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#32 2014-07-24 22:32:34

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Grabbed another boot disk and it worked fine. I dont have any non-backlit RAM so I am limited to system 6 but eh, it works.

Your job is to find out if we can get replacement SWIM ICs scrounged from other boards.

Funny thing is the board I watched the SWIM burn out on, had crap underneith the VIA when I pulled it out.

I think whats happening is cap goo gets under the chip and shorts it all out. Because both boards that the SWIM died on, all started with CD34/CD36 SAD mac codes.

Replacing the SWIM, removing the VIA and cleaning/sanding the pins, and replacing seems to bring it back to life.

Last edited by techknight (2014-07-24 22:43:05)

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#33 2014-07-25 03:07:59

cc333
Member
From: North S.F. Bay Area, CA
Registered: 2014-05-23
Posts: 571

Re: Mac Portable motherboard repairs

That's astounding!

You'll probably do wonders with my board!*

c

*Once I get it to you....


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13"
Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others....
Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.

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#34 2014-07-25 03:51:42

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Well I got 1 totally braindead disaster alive again.

Chompin away at a boot disk, and seeing the HDD.

I did notice these portables are pushing around 5.2V on the VCC rails, and I confirmed this on more than one. Thats not THAT high, but its pretty out of spec as 5V supplies are concerned.

Last edited by techknight (2014-07-25 03:52:47)

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#35 2014-07-25 22:33:32

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Grabbed haplain's braindead board and Removed the SWIM. It too chimed. But it had chimes of death CD36 as I explained above.

So did some probing against my charts, and found an open trace to the VIA on one of the address lines. thatll do it. Ran a wire, and it chimed!

So i put on another SWIM and now its working. Thank god I figured these little buggers out.

Thinking about offering a repair service for the portable logic boards.

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#36 2014-07-26 02:26:41

cc333
Member
From: North S.F. Bay Area, CA
Registered: 2014-05-23
Posts: 571

Re: Mac Portable motherboard repairs

Please do! I'll be a very happy customer if you can get mine fixed!!

Also, how about Quadra 840av boards? I have a couple of those that you might be able to repair, if you're willing.

c


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13"
Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others....
Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.

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#37 2014-07-26 03:26:37

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

great job mike.  i totally knew that when you got a few moments that you would get it down.!


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#38 2014-07-26 03:30:44

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

You have inderectlly solved some se/30 issues as well?

Last edited by uniserver (2014-07-26 03:31:38)


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#39 2014-07-26 23:15:18

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

I havent tried that board yet.

I had to take shop time in order to get these done. its been slow at the shop, so i decided to work on them then.

Last edited by techknight (2014-07-26 23:17:36)

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#40 2014-07-28 07:42:52

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

so you pretty much got all the portable fixed?


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#41 2014-07-29 01:54:59

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Well I have quite a few boards left that all need SWIMs.  So i am on the lookout for those. I had to sideline them. Hap's 3 boards that this thread was started over, all were fixed and shipped back to him today. Hes shipping me a surprise which actually came to me today, huge heavy box so i dunno whats in it. However...

I Got cc333's board in today.

it has a corner routed off on it for one. Other problem is, the 5V regulator the drive signal to it is open. So that transistor is allowed to float! Well this is bad, becuase at some points all the chips were seeing full voltage, of 7.5V at times.

so since all the chips were pretty much run past the specifications, the fault could be any one of those ICs.

Ill figure it out im sure. Not going to be fun.

Its stuck in a RESET loop. Funny thing is, the RESET signal to the CPU is steady. So the CPU is not rebooting from voltage, or a reset.

However... the IPL0/IPL1 is toggling just after the chime. This means an interrupt from the MISC/GLU is firing too early and causing the CPU to reboot from an illegal instruction encounter. hmmm....

It also looks like the SCC, and SCSI ICs have been dicked with.

Last edited by techknight (2014-07-29 01:57:07)

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#42 2014-07-29 11:32:59

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

i have some swims here for you..  i am just really busy right now...


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#43 2014-07-30 00:15:21

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Ha. really busy. Look how the tables have turned. LOL... Just kidding, I know the feeling....

Well that fucked up cc333 board is running again.

Total head scratcher though.... I repaired the connection to the regulator, so now I was sitting at a stable 5.2V. Which is normal for the portable.

But, it was going bong-bong-bong-bong. With about 2 seconds in between. Stumped, I decided to remove the SWIM. Made no difference.

Then I said ok, Lets check the interrupt priority lines. IP2 was high, as it should be. IP0 was high, as it should be. but IP1 was being toggled rather quickly during startup. This attached to the SCC, the main glu, and the apple sound chip. So... I removed the SCC as it was once removed before, it stopped going into a reset-loop. and sad-mac. Major code 08, minor 01. That is a bad data bus, or error on the databus, at bit 0.

So, I did some more investigation, as from research this all points to RAM. So I stuck the expansion RAM in it, and it threw another SAD mac. saying it cant address the expansion RAM, that there is a bad address line.

Well... That makes sense with the RAM. So then I knew from that point forward to look at the RAM, or the RAM decoders. So I watched the decoders and buffers with the scope, all looked good. Except for one of the address lines. It appeared that it wasnt doing anything. hmm......

So, I started removing RAM. I removed a couple chips that had dark/corroded looking pins, and the reset chime slowed down, but still was chiming over and over again. Which also means it wasnt testing all the RAM!

Then upon closer inspection, one of the address lines was open! So, I placed new RAM back in its place, and made a jumper to fix the address line that was broken. Presto... Fixed. the machine now chimed and stayed on with no sad mac.

At this point, i resoldered the SCC, and SWIM back in place. It started up, booted from floppy, booted from HDD, etc.. Everything was good!

Thank god... That one wracked my brain for a bit. But I got it!

Blue wires are my repairs.

Pics:
20140729_130021.jpg
20140729_130026.jpg
20140729_130410.jpg
20140729_130855.jpg

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#44 2014-07-30 02:48:06

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 968
Website

Re: Mac Portable motherboard repairs

Nice work! What's up with that corner?


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#45 2014-07-30 14:31:42

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

I dont know. Uniserver will have to tell the backstory on that one...

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#46 2014-07-30 20:58:19

cc333
Member
From: North S.F. Bay Area, CA
Registered: 2014-05-23
Posts: 571

Re: Mac Portable motherboard repairs

YAY!!!!!!! big_smile big_smile big_smile big_smile big_smile big_smile

I can finally have a WORKING Portable!!!!!!!!!!!!!!

Do I owe you anything? I don't have much money at present...

...But I'll figure SOMETHING out! Because this is so neat, and you deserve some compensation!!

Great job!

c

Last edited by cc333 (2014-07-30 20:59:23)


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13"
Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others....
Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.

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#47 2014-07-30 21:04:07

cc333
Member
From: North S.F. Bay Area, CA
Registered: 2014-05-23
Posts: 571

Re: Mac Portable motherboard repairs

Whew...

Now that I've calmed down a bit, I'll tell you what either Hap or Uniserver told me (can't recall who right now, but it was one of them).

What happened is that Uniserver recapped it and apparently had it working, and when Hap received it, the corner had been broken in shipment, and it no longer booted (exhibited the symptoms that both you and I experienced), so after some back and forth, I think Hap just decided to keep it and sell it as a fixer-upper machine (the one I ultimately ended up buying from him), figuring that it could be repaired down the road by someone who knew about such things.

Uniserver or Hap will have to fill in the blanks and/or fix mistakes/misinterpretations, but I think this is essentially how it went (as I understand it).

c


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13"
Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others....
Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.

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#48 2014-07-30 23:04:44

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Mac Portable motherboard repairs

the corner,  Yeah i know about that corner.

like how rounded it is?

Yup that was my handy work!  I had received it, ( from hap ) ( this time last year ) and the corner was blew out like it had suffered an olympic frisbee style hard wing across a usps warehouse somewhere.
So i did the best i could,  ( always do ) and sanded it down with my dremel.

As to the rest of the story, don't recall… I have re-capped about 20 or more portable boards for hap.
Its hard to keep track of the details of each one… One thing I will say is, HAP had some very good luck with
the portable boards working after a re-cap. 

Now that techknight is on board and up to speed with his portable repair service.
I now have a place i can send my dead portable re-caps to…   Maybe if Techknight agrees I will just pass them to him with a $75 an hour price tag.  Techknight is the man.!

Last edited by uniserver (2014-07-30 23:28:04)


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#49 2014-07-31 02:43:37

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Mac Portable motherboard repairs

Naw, I am a $50 an hour guy. (my standard shop service). But with these vintage boards, Ill reduce that a bit. as some of these can take a couple hours to figure out, and you'll run past the value of the board quickly at that rate!

Last edited by techknight (2014-07-31 02:49:10)

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#50 2014-08-07 01:54:31

cc333
Member
From: North S.F. Bay Area, CA
Registered: 2014-05-23
Posts: 571

Re: Mac Portable motherboard repairs

OK, when do I get my board back?

Do I owe you any money?

c


Main Macs: Early '09 Mac Pro, Mid '12 MacBook Pro 13"
Secondary Macs: Early '08 Mac Pro, Mid '12 MacBook Pro 15"
Playthings: Mac SE/30, 3.0 GHz Mavericks-based HackServe, Many others....
Desired: Lisa, Kanga PowerBook G3, Apple IIc, Apple II, Spare parts, etc.

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