Backlight on T400

[DjBass]

Hello. I have a problem with backlight on my T400. My screen is darker on both sides, not only one. This is most visible at the lowest backlight level. Better description is in my photo. What could be bad? Inverter or CCFL? Thanks.

[al.ava]

i can ensure you 90% it is the CCFL in your screen, inverters dont act that way, by any chance do you see a pinkish/red color when you first start the computer?

[DjBass]

Thank you for your reply. It is not visible all the time. When i start the computer I do not see anything wrong. When is backlight 100%, I do not have any problem. The problem occurs when I decrease backlight to approximately 20% and less (usually at night). This is most visible on white background.