Powerbook screen image flickers once after a reboot, otherwise white screen

[gregoireg]

I have a Powerbook 145B.

- One year ago, the screen was working but was super ugly (cap problem).

- This week, the screen has been (ugly) white without any image.

- Therefore, I have opened and recapped the screen board. The screen is now perfectly white but still no image.

****But**** if I shutdown the laptop and restarts it immediately, the screen flickers for a second and shows the real image/content. It's like the screen doesn't update the content except for one second after a reboot.

The screen PCB board doesn't seem to have any problem. The caps pads were bad but I have cleaned them up and replaced all the caps.

Any idea what's going on and how I could fix this screen?

The one-second flicker shows that the screen can work but there is something wrong as the content is not updated.


PS: Perhaps the problem is with the laptop mother board, not the screen.

 

[starlite]

Don't underestimate the value of a very thorough cleaning. It can solve a lot of problems. Already cleaned it? Do it again! Both sides of the board. Check for bad traces/shorts anywhere. Could be one leg on a chip that isn't making good contact that's causing the display not to refresh as it should.

 

[gregoireg]

Thank you for your help. It turns out that the luminosity was at the maximum and the screen was then all white!!! At least, I have now a working (recapped-screen) PowerBook 145B.

 

[starlite]

That will do it! Glad it's working now.