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Yet another Macintosh Portable repair thread.

Macintosh Portable Power Repair Capacitors Hybrid

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30 replies to this topic

#21 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 01 April 2017 - 01:29 AM

Thanks.

#22 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 01 April 2017 - 03:24 AM

What's the value of the resistor near pin 1 of that IC supposed to be? Looking at that picture again, having posted it, it looks a little cooked. I'd like to be able to meter it out.

#23 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 01 April 2017 - 03:32 AM

That screen looks glorious.


It really is not bad. I appreciate that the backlight makes the screen usable in a low-light environment, but having spent time playing GameBoy in my youth, this is -in my opinion - better in terms of viewing angle, and of course, resolution. Not bad for 1989.

#24 techknight

techknight
  • 68LC040

Posted 01 April 2017 - 12:05 PM

What's the value of the resistor near pin 1 of that IC supposed to be? Looking at that picture again, having posted it, it looks a little cooked. I'd like to be able to meter it out.

 

Normal. And its not a resistor. its a capacitor, and it got hit with cap goo at one point. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#25 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 02 April 2017 - 04:15 AM

Well, the resistor across pins 16 and 18 send to have done the trick!

IMG_20170401_231833.jpg

It now properly indicates charging, and charging cuts off when the battery is full.
I even got a rare boot off of the failing hard drive (degraded seal is removed, heads only seek every once in a while).

Thanks for the assistance!

#26 techknight

techknight
  • 68LC040

Posted 02 April 2017 - 02:23 PM

Glad you got it going. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#27 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 18 April 2017 - 01:45 AM

I'm back: same portable, different issue.

I mentioned before that I have been having problems with the hard drive. I've tried a few things; bear with me as I list them out.

I had a few successful boots from the drive (with a 6v battery clipped to the battery bay connectors, and the adapter plugged in) before I did anything to the hybrid, though it progressively got less reliable, sometimes crapping out after the initial spin up, only to "catch" on the second spin up. Sometimes it would never get going.

I cracked the drive open and cleaned out the goo. It all appeared localized to the groove. This had no appreciable effect.

Around this time I did the hybrid board work. Battery only from this point on.

Post hybrid board work, behaviour remained the same... Very rare for the drive to 'catch' and read on a spin-up, but it would on occasion.

I decided to try swapping in the Conner HD from my IIsi, by swapping controller boards. The IIsi drive didn't work in the portable with the low-power board, and the portable drive didn't work in the IIsi with the regular molex/scsi board. The IIsi drive worked fine in the IIsi when reunited with its original board.

Assuming that the low-power board and drive were dead, I built an adapter cable as described here: http://antinode.info.../port_scsi.html

I connected the IIsi drive up in the portable with this adapter cable, and on boot, the portable showed me the 'Welcome to Macintosh' screen... And then the drive spun down, and got stuck in a spin up / spin down loop.

I tried again a few times, with similar results. It seemed like it was having the same problem that it had with the low power drive.

AND THEN IT WENT BOINK.
One boot game me the chimes of death.
IMG_20170411_203026.jpg
I disconnected the hd, but it didn't have any effect. I figured I had well and truly wrecked it, as it came up exactly the same on several reboots.

...Then, 10 minutes later, it chimed up as fine, and gave me the disk missing icon. It booted fine off of a floppy, and off of FloppyEmu after that.

Curious to know if anyone has any ideas, given this scenario. The portable still boots fine off of a FloppyEmu​, so it's not just a pretty prop, but I'd love to get an internal HD back into the mix. I'm a little leery of trying anything to that end at the moment, given this misadventure.

#28 techknight

techknight
  • 68LC040

Posted 19 April 2017 - 10:13 PM

Now, another guy here just discovered the little switch in the back of the battery compartment became intermittent and was doing very strange things similar to what your having. 

 

There are 2 red wires on the 4 pin molex connector that go down to the logic board, both red wires have to be HOT at battery voltage at all times! if one of them drops out (because of the switch being bad or completely dis-engaged with the cover removed) it will never ever ever work properly. 

 

Also CD34/CD36 is a PMGR read fault. usually occures at the nexus between the VIA and the PMGR IC. But I wouldn't trust that until you iron out your voltage issues. 


Edited by techknight, 19 April 2017 - 10:14 PM.

Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#29 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 19 May 2017 - 03:08 AM

Voltage appears to be stable (on both wires), and the switch in the battery compartment seems to be working correctly.

 

I'm still getting this error.

IMG_20170411_203026.jpg


#30 techknight

techknight
  • 68LC040

Posted 19 May 2017 - 09:54 PM

either the VIA or the PMU died. or traces in between. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#31 Westinghouse

Westinghouse
  • 6502
  • LocationCanada

Posted 19 May 2017 - 11:09 PM

either the VIA or the PMU died. or traces in between. 

 

Thanks -- before put in too much time following traces, is there any info anywhere of which pins are connected between these ICs?







Also tagged with one or more of these keywords: Macintosh Portable, Power, Repair, Capacitors, Hybrid

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