PowerBook 160 Brightness

[PotatoFi]

This evening, I recapped my PowerBook 160 LCD, and the screen itself is working great again! The contrast slider works pretty well, too.

What isn't working reliably is the brightness potentiometer. It seems to only go between "off" and "sorta bright". I pulled out the small board with the potentiometers and flushed them with alcohol. After drying the board out with the air compressor, I reinstalled it.

In the first few seconds of the machine being powered on, it sort of works, allowing me to turn it on and off but not much more. By the time I get a happy Mac, it seems to get stuck at full brightness.

Any ideas what is going on here? Could it be the two capacitors that are on the board?

 

[max1zzz]

I would replace those two capacitors, I had a couple of 1x0 series powerbooks a few years back which acted a similar way and replacing those caps seemed to improve the symptoms

 

[Daniel Hansen]

There's a good chance those two caps are a factor. I've recapped a few of those boards and usually one of the caps is leaky.

 

[rollmastr]

Same here, even after replacing the two caps on the board.