PowerBook 145B Noise & not booting

[robin-fo]

Hi everyone,

I have a PowerBook 145B which for many years now is unable to boot and most of the time produces a loud noise:
View attachment IMG_1148.MOV
The screen is recapped and the main battery removed since years..

 

[bibilit]

What about the PSU ?

Probably have a spare logic board if required.

 

[3lectr1cPPC]

Sounds like my PowerBook 150 when trying to run it off its dying battery, as it dies it will display a blank screen like that and similar speaker crackle. So yeah, check the AC adapter if it's an original, if not my next guess would be a short somewhere.

 

[robin-fo]

Ok thanks, I'll check the PSU. Up to now, I considered it as working because I used it sometimes for my PowerCD, but I know that the PowerCD is very tolerant concerning its input voltage...

 

[Dogmander]

Did you ever get any further? I’m trying to diagnose a nonfunctional 140 of my own and was wondering

 

[robin-fo]

I didn‘t investigate much further, but the PSU is probably not the issue

 

[Dogmander]

Okay, I see