inspiron 1420 backlight dims when on AC power

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mechanical173

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Jan 9, 2011
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I have a Dell Inspiron 1420 running Vista 32bit.

I recently had a hard drive failure and reinstalled vista and all of my drivers. everything went well except for this issue with the backlight. on battery power I can control the backlight with Fn+up/down. however, once i plug it in, the backlight dims to the lowest setting and i can't change it. the brightness graphic still appears when i use Fn+up/down and the level on the bar changes, but it has no effect on the brightness.

I am 100% certain that it's not an issue with the backlight. I've tried reinstalling the drivers and getting the latest updates from Dell. the power management application also doesn't solve the problem. I have found a handful of other people describing the same problem using google, but no solutions.

I'm an engineer by trade and no stranger to problem solving, but I've spent too much time on this as it is and figured I have nothing to lose by posting here. can anyone give me a solution (or a cause)? any help would be much appreciated.
 
Joined
Dec 11, 2008
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1,059
hello,
you probably already tried this but here goes.. click the battery icon, choose "more power options">adjust the brightness display (left hand side) lets you set with/without ac power.. good luck..
 

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