Brightness on computer screen keeps changing

munch

munch

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As the tittle says my HP2009v has started to change its brightness all by itself. Anybody got any ideas what's causing it?
 
Ambient light sensor?

I don't know for sure that your laptop has it, but many do now a days.

Have a look at your screen settings, or may you have some proprietors HP software that you can load to change certain settings.
 
Munch

I take it this is the HP2009v monitor. As far as I can see from the manual ( not a lot there anyway) there doesn't seem to be an ambient light monitor. By any chance do you have a calibration device connected to your system. If you do check that this doesn't have a ambiant light detection option. If so turn it off
 
No ambient light monitor that I can see. no calibration device attached either. HP 2009v is a monitor.

Thanks for the reply's so far, any more ideas?
 
Is there any paten to the brightness change. This seems to be a CFT based monitor not LED as far as I can tell from the specs. These do require time to get to full brilliance and become stable. Are you seeing the brightness increase over a short time , say 10 to 15 mins
 
@munch

Have you checked the obvious to illiminate certain possible causes?

Checked all leads are connected firmly/swapped leads out?

Tried another monitor to rule out GPU issues?

Repeatedly pressed all buttons on the monitor firmly to see if there's a sticky/dirty membrane switch?

Tapped the chassis of the screen in all places to test for broken/worn connectors internally/dodgy CCFL tubes/inverters?


As above though.... old CCFL lighting takes time to reach full brightness. My second screen is an old Dell 2007 and takes around 2 minutes to reach full brightness, whereas my main screen takes around 30 seconds. CCFL tubes need to warm up, so do you mean it flickers, or just changes over time?
 
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