In this case it was not. like I said it was a failure in the logic board, it was not providing one of the required voltages for the display.
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Powerbook 100 display issue
- Thread starter macman0512
- Start date
In this case it was not. like I said it was a failure in the logic board, it was not providing one of the required voltages for the display.
Right here:
one of the two 150uH inductors, the pin gets eaten away, and it fails. prevents that voltage from being generated.
one of the two 150uH inductors, the pin gets eaten away, and it fails. prevents that voltage from being generated.
I can see how that failure wouldn't be easy to spot - thank you for your explanation!
What are the specific component designations?
Hazarding a guess here, but figured everyone else who's not up to snuff on this stuff would like to know as well. Are the inductors good to go with a trace repair or should they be replaced along with the caps?
On the dead pixel front: I just bought another 100 for backup parts from a member. Very happy with it, knew it had trackball damage, but the rubber on the lid appears to be intact. The spacing of lid to base is perfectly even front to back, so the rough handling hypothesis still stands for some 100s I think.
Will the panels with that damage ever work again or are they gone for good? The screen was what I wanted to use for my test setup, go figure.
Hazarding a guess here, but figured everyone else who's not up to snuff on this stuff would like to know as well. Are the inductors good to go with a trace repair or should they be replaced along with the caps?
On the dead pixel front: I just bought another 100 for backup parts from a member. Very happy with it, knew it had trackball damage, but the rubber on the lid appears to be intact. The spacing of lid to base is perfectly even front to back, so the rough handling hypothesis still stands for some 100s I think.
Will the panels with that damage ever work again or are they gone for good? The screen was what I wanted to use for my test setup, go figure.
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The screen should still work with a recap, it will just not display anything on the damaged area. Sure, it will always have that defect but it could be a lot worse.
I'm flattered to be quoted as a source of info for PB100 repairs 
Indeed my own screen suffers the same problem, and it's trackball impact ( due to the long grey rubber stripes turning into goo, so less thick, and the ball that's never supposed to touch the screen now touches it)
This especially happens during shipping (so if you buy a PB100 that looks neat, ask the seller to remove the trackball !)
However, all plastics in PBx series are VERY brittle due to age; so it's likely removing the trackball will... break the pins of the trackball ring around it (been there). Choose your evil !
Yeah --- retro computing is full of frustration I think of selling all my collection twice a month. And then go on.
Indeed my own screen suffers the same problem, and it's trackball impact ( due to the long grey rubber stripes turning into goo, so less thick, and the ball that's never supposed to touch the screen now touches it)
This especially happens during shipping (so if you buy a PB100 that looks neat, ask the seller to remove the trackball !)
However, all plastics in PBx series are VERY brittle due to age; so it's likely removing the trackball will... break the pins of the trackball ring around it (been there). Choose your evil !
Yeah --- retro computing is full of frustration I think of selling all my collection twice a month. And then go on.
I’m working on one of these and after the recap, ultrasonic wash, bake and dry; I now get a backlit screen and nothing else. I would be gracious if you could point me in the correct direction to fix the voltage. I have included some pics of the area I believe you are talking about, but do not know where to go next.
EDIT: sorry, just found your picture.
Are these the two that likely need replacement?
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No, they dont need replaced. they need removed and checked. to make sure they are still good and traces underneath are fine.
All three of them btw
All three of them btw
Perfect, thanks for the information. That will be my next check.
Update: removed all three and the traces look good on the board. The inductor from L3 (right in between all four caps) has the plastic molding broken off underneath, which holds the pins steady on the bottom. This may have been from my removing, but it’ll need to be replaced. I have included some pictures.
Once I get away from capacitors, I'm way out of my league. From your previous picture I would guess this is one of the 150uH inductors? The ones I took off are not labeled.
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Update: I checked the continuity of all three inductors and they are good, so I don't know where to go from here. Traces look good as well, I have posted some pictures from yesterday. If there is another area I should focus on trouble shooting, I'm open to ideas.
I just got a new PB100 today, of course it does not start and has leaky caps.
So i'll recap a PB100 once again.
I've been lookin for one since a long time, as I've got a perfectly working one (recapped, bluescsi, etc) but it had red dead pixels due to trackball impact
This new PB100 I bought has a perfect screen, and is less yellowed...
I'll probably update my previous topic, it's likely I'll chose the replacement caps (even) more carefully.
So i'll recap a PB100 once again.
I've been lookin for one since a long time, as I've got a perfectly working one (recapped, bluescsi, etc) but it had red dead pixels due to trackball impact
This new PB100 I bought has a perfect screen, and is less yellowed...
I'll probably update my previous topic, it's likely I'll chose the replacement caps (even) more carefully.
Any updateI just got a new PB100 today, of course it does not start and has leaky caps.
So i'll recap a PB100 once again.
I've been lookin for one since a long time, as I've got a perfectly working one (recapped, bluescsi, etc) but it had red dead pixels due to trackball impact
This new PB100 I bought has a perfect screen, and is less yellowed...
I'll probably update my previous topic, it's likely I'll chose the replacement caps (even) more carefully.
Do you believe me if I tell you that since posting this I have bought no less than two other vintage computers all needing repair
Is there like an AA for vintage enthusiasts to share their problems buying useless junk ?
Joke apart the parts are in, this is my next next project.
Is there like an AA for vintage enthusiasts to share their problems buying useless junk ?
Joke apart the parts are in, this is my next next project.
Let me know if this group exists and when the next meeting is pleaseIs there like an AA for vintage enthusiasts to share their problems buying useless junk ?
Yea, will all need to go to these meetings and share our love err problems for old vintage stuff like macs
