Thread
PowerBook Duo 230 not working
I got a Duo 230 in unknown state. When I powered it on, it worked, but it was unstable. I then examined the capacitors on the board and found that every one of them was leaking, so I replaced them. The Duo turned then on and it worked for a half an hour or so, but when I tried to power it on second time, it failed.
It is dead, and something clicks in the DC-DC area of the board for a few seconds, then it stops. It looks that the board is drawing a lot of current, since as I plug in the charger, it sparks a bit. Also the LT1171CQ regulator IC next to capacitors gets very hot after a minute, so hot that it started to melt flux that was present from the factory...
I checked all the my recap work and even did it again with another batch of capacitors, but the issue remains. As far as my knowledge goes, I believe that there must be something wrong with that IC or the something that controls the IC... but I don't have a clue.
It is dead, and something clicks in the DC-DC area of the board for a few seconds, then it stops. It looks that the board is drawing a lot of current, since as I plug in the charger, it sparks a bit. Also the LT1171CQ regulator IC next to capacitors gets very hot after a minute, so hot that it started to melt flux that was present from the factory...
I checked all the my recap work and even did it again with another batch of capacitors, but the issue remains. As far as my knowledge goes, I believe that there must be something wrong with that IC or the something that controls the IC... but I don't have a clue.
Update: I took of the LT1171CQ IC and now it works. Sort of. It chimes, but it only gets to the white screen without a cursor or insert disk icon...
There is, however a nasty whine for a few seconds when I plug in the adapter.
There is, however a nasty whine for a few seconds when I plug in the adapter.
Try replacing that IC with a new one. I would suppose it needs to be there, which is why it whines and fails to completely boot.
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I replaced the IC with a new one, and now it works correctly. It still whines for a second or so, but I believe that this is normal.
But, now I discovered that the display flat cable is broken, as I can't adjust the contrast (it goes only up, but not down).
Is there a way to repair the cable? There are only 2-3 vias that are broken.
I also found out that a SMD wirewound resistor .1 ohm WSC-1 is open. It is connected to the battery and it seems it was used as a fuse. This probably explains why the battery wasn't charging.
Can I replace this resistor with a jumper wire?
But, now I discovered that the display flat cable is broken, as I can't adjust the contrast (it goes only up, but not down).
Is there a way to repair the cable? There are only 2-3 vias that are broken.
I also found out that a SMD wirewound resistor .1 ohm WSC-1 is open. It is connected to the battery and it seems it was used as a fuse. This probably explains why the battery wasn't charging.
Can I replace this resistor with a jumper wire?
repairing FFC cables arnt exactly easy. The only thing I had come up with is slightly sand down the kapton to get to the bare copper, and fix it with a conductive pen. But even that is touch and go.
Easier to run wires around it by soldering point to point on both ends.
Jumpering the resistor probably wouldnt be a good idea, because it could be a fusible resistor, BUT it could also be the current-sense resistor for the machine to monitor battery condition and charge levels.
Easier to run wires around it by soldering point to point on both ends.
Jumpering the resistor probably wouldnt be a good idea, because it could be a fusible resistor, BUT it could also be the current-sense resistor for the machine to monitor battery condition and charge levels.
I drew the line too soon. It actually doesn't work correctly. It will chime, but I only get a white screen with no pointer (even in the Duo Dock, so it isn't the LCD cable), and the hard drive won't spin.
The PRAM battery is missing, but I doubt that this will cause these symptoms.
So I am out of ideas, could be anything else that I could test?
The PRAM battery is missing, but I doubt that this will cause these symptoms.
So I am out of ideas, could be anything else that I could test?
White screen? or the typical "grey screen"
Grey screen. The one that usually shows pointer and the happy mac/insert disk icon. Sadly, I don't get either of these.
Ok. The SCSI controller or ASIC is at fault here. Ive seen this once before. Do you get a chime? Youll also notice the HDD doesn't spin up either.
Ill have to dig in my stash. I may have a logic board. Youll need a new one.
Ill have to dig in my stash. I may have a logic board. Youll need a new one.
You are bang on. I get a chime. The HDD won't spin.
I do have a dead LC III board (battery leakage). Perhaps are chips interchangeable with Duo?
I do have a dead LC III board (battery leakage). Perhaps are chips interchangeable with Duo?
I cant recall if they are or not. Take a peek. Should be a 53c96 or something thereabouts.
I changed the SCSI chip, but it still doesn't work. So I guess I would need a new motherboard. However, this PB 230 also has a dead keyboard, a LCD with delamination problems and a broken LCD latch. So I guess it's more or less just for parts...