• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

PowerBook Duo 230 blank screen

worldofJCK

New member
So I got this Duo 230 a while back and it’s in fantastic cosmetic condition.

Until recently, it also worked perfectly - I was able to use it and do anything with it that I pleased. 

So my project was to rebuild a battery for it, which I did. I got proper voltage and everything but I never quite seemed to get the computer to understand the battery. It flat-out wouldn’t work at all until I updated it to system 7.5.3., and then it would say the battery was fully charged immediately whenever I would insert it. 

But all that has become second priority, since the morning after I completed the project, I booted the machine, no problem. Turned it off and booted it again a few minutes later. Heard the chime and everything but all I got was a darkly lit screen, no data to the display, and that’s how it’s been ever since. It looks like the contrast is turned all the way black, but I’ve confirmed it’s not that. I’ve checked all the connections of the display cables and checked everything else obvious I thought to check. The computer is operating fine; when you hit the button to power it down, you get the beep, and when you hit the return key it shuts down, so the OS seems to be operating as usual. 

I started collecting vintage PowerBooks a few years back but this is the first time I’ve ever posted on this forum. I just wanted to know if anyone else has had this experience. Is it a common problem? Do these displays just... go bad, all of a sudden? Or is there some obvious fix I’m not checking?

Thanks for reading!

image.jpg

image.jpg

 

bibilit

Well-known member
Don't have any experience with the Duos series, but this is the kind of screen you get when capacitors have failed.

The Powerbook 100 is displaying this blue hue screen when the capacitors on the back of the screen are bad, can be related to logic boards caps as well.

 

techknight

Well-known member
yeap caps. the duo screens have the same junk caps in it. 

The logic board has a few by the DC jack. 

 
Top