How to power up PowerBook 100 w/o keyboard!

[bengi3]

I am replacing the caps to this PB 100 motherboard and want to see if I can sort out the known dark screen syndrome. Is there any way to power-up this thing without reconnecting any time the keyboard?

Usually in the logic boards there are two small contacts to short for the machine to power up, I cannot get to locate them.

Help

 

[bibilit]

Don’t know for sure, but have you tried with an ADB keyboard ?

 

[bengi3]

Thank you. Will try tomorrow, but IIRC it doesn't work. Anyhow it would be useful if someone could come up with another solution.

 

[Fizzbinn]

Curious, having recently gotten my PB 100 back in working order (recap and LCD backlight from parts machine, thanks @CharlesT! ) what do you mean by “dark screen syndrome”?

FYI I reassembled mine enough to connect the keyboard when testing after the recap. Can’t see the keyboard in this pic but it was there:



My “dark screen” culprit:


Of course the screen also needed a re-cap.

LCD caps before (mine basically fell off when nudged):



LCD caps after:

 

[80sboy]

I just recapped a Powerbook 100, screen and all and still have dark blue screen on boot. : (

 

[bengi3]

I just recapped a Powerbook 100, screen and all and still have dark blue screen on boot. : (

So far I have recapped the whole logic board but still get the dark blue screen on boot: tomorrow will recap the LCD. I have read that sometimes the complete recap does not solve. 

 

[bengi3]

Recapped also the LCD: no way :-(

 

[bengi3]

Don’t know for sure, but have you tried with an ADB keyboard ?

Doesn’t work

 

[bengi3]

These are the projects during the quarantine:

PowerMac G5 LCS

PowerBook 100

 

[Trash80toHP_Mini]

Don’t know for sure, but have you tried with an ADB keyboard ?

Doesn’t work 

Interesting, my PowerBooks always seem to boot when I plug in the the power cord. That's probably do to bad backup batteries. So if you haven't, try doing that with and without backup batteries in battery so to speak.

edit: I wish my quarantine projects were so neatly laid out. Is that because you have all the room you want or that's all they'll let you have? :lol:

 

[bengi3]

Interesting, my PowerBooks always seem to boot when I plug in the the power cord. That's probably do to bad backup batteries. So if you haven't, try doing that with and without backup batteries in battery so to speak.

edit: I wish my quarantine projects were so neatly laid out. Is that because you have all the room you want or that's all they'll let you have? :lol:

They moved me to the basement ;/)

 

[electricmonk]

That's a lovely heap of Powerbook 100s you have there! It's a great machine and I have fond memories of it from when I was a child which is why I'm plugging away with my own PB100 restoration project.

I thought mine was totally fixed but I managed to get it back into BSOD mode by fiddling a bit carelessly with the power supply. A PMU reset appeared to get it going normally again.

Pity you can't advance the date past 2019 but what a gorgeous Powerbook, eh?

 

[Trash80toHP_Mini]

Indeed, called mine BabyPB and dearly loved it as it became my first ever laptop/notebook. Sometimes I wish I hadn't started hacking it almost 20 years ago, but I've got a couple more. One day, BabyPB will become the center focus of my collection's display unit.

@bengi3 did the family quarantine you in the basement. Things have been really rough over there.

 

[bibilit]

There is a capacitor also in the dauther/processor board, can be missed. 

 

[bengi3]

Now I am recapping another logic board, this time the right way: desolder, clean with isopropyl alcohol, dishwasher, dry thoroughly (a week or two), recap. Yes, I know thet there is a capacitor in the processor board.

 

[electricmonk]

Good one. I'll be doing another PB100 soon and will be more rigorous this time, now that the initial breathless excitement of getting one working has been replaced by a strong desire to do it right.

I haven't got around to doing the daughterboard cap or the trackball caps on mine yet but I'll do those too.

@Trash80toHP_Mini, any thoughts about replacing the rubber in the channels on the bezel?

 

[Trash80toHP_Mini]

Dunno offhand, I'll give it a look and try to figure something out. Maybe casting replacements in that goopy stuff?

 

[bengi3]

Now I am recapping another logic board, this time the right way: desolder, clean with isopropyl alcohol, dishwasher, dry thoroughly (a week or two), recap. Yes, I know thet there is a capacitor in the processor board.

Another Mac liberated! Incidentally, is it possible that a whole lot of cheap caps is bad? The same lot that I used for a Mac Classic and also at that time I had to recap everything.

 

[cheesestraws]

is it possible that a whole lot of cheap caps is bad

Caps that you bought?  Yeah, possible - how likely it is depends where you got them from.  If they're from eBay then it's decidedly possible.  If you got them from a more reputable supplier then it's much less likely.