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The fault could be a faulty inverter board or a faulty CCFD lamp.
The inverter supplies high voltage to the CCFL lamp. The CCFL lamp is a mini fluro lamp and can dim with age.
Check LCD Parts for service, parts and DIY info - click on this link to their WEB site : - www.lcdparts.net
there is a lock system to this monitor put crt front portion on table take a smallest screwdriver insert it into the narrow gap and pull the cover upperside it will open there are two gaps anyone you can try
Flyback transformers usually have 2 adjustable rods - 1 is for focus the other is for screen (G2) voltage. try turning Clockwise the Screen adjust with brightness-contrast at max. Till you see white diagonal lines, then go back until the lines disappear - then tune the brightness to your desired level.
Well most monitors come with 2 preset color temperatures and the option to customize it(the rgb setting). Your monitor has them as well 6500K or 9300K. 6500 is more reddish(like outdoors) and 9300 is more a bluish white(like a tv, i like the 9300 more).
How u said its red and bright, what i would do is set the 9300 preset and if its still too red the customize the RGB by lowering the red. and If too bright then Lower the brightness(Press down on BRIGHTNESS CONTRAST page).
If you don't have the manual you can download the full manual from LG's download site here:
If you see that you can't get it just right,then the monitor might need adjustment from inside and you should make a qualified technician open the monitor and adjust that for you.
Hope this was helpful.