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Monitor is too bright… Brightness cant be controlled!!!

ranatungawk

Aug 5, 2010
10
Joined
Aug 5, 2010
Messages
10
Hi guys! I’m using a Philips CRT monitor. When I was working on the computer, all of sudden the monitor brightness got changed and now the screen is too bright. The brightness can’t be control with the front side controller!! However the screen contrast can be changed! . After I got this problem, I saw a very bright light appears in the middle of the screen when the monitor is power off. ( just like a camera flash light) .; can you suggest what can be the problem ?
The monitor symmetric diagram is attached herewith. (http://www.4shared.com/document/cErzPYPO/Monitor_Philips_104S.htm)

Monitor : Philips 104E
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,505
Joined
Jan 21, 2010
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25,505
Check the pot used to control the brightness. It is possible that the pot has gone open, or that one of the leads has come loose.

It may be something more complex, but that's something simple to check first.
 

shrtrnd

Jan 15, 2010
3,826
Joined
Jan 15, 2010
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3,826
If you have solid-state potentiometer, look at the integrated circuit variable resistor chip. Mine was a different model, but the variable resistor chip failed, and screen went to full brightness, with no control.
 
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