View source for Problem with red tinted display

Information about the problem of red tinted display corners in T23 ThinkPads.

==Problem description==
If your screen is developing a red tint on the bottom left and/or right corners, this is the sign of a dying LCD and it will slowly spread to the whole screen.

The red tint is strongest when the screen is first switched on and it will fade away with the time your ThinkPad is running.

==Affected Models==
*ThinkPad {{A22p}} (2629-Y2U, 15.0" TFT display with 1600x1200 resolution) 
*ThinkPad {{A31p}} (2653-H4U and similar with high resolution displays)
*ThinkPad {{T21}} {{T23}} (with high resolution (SXGA) displays)
*ThinkPad {{T40}} (14.1" TFT 1024x768)

==Affected Operating Systems==
*all

==Status==
It is not clear which component (screen/backlight/inverter) exactly is responsible for this.

==Solutions==
You can have IBM fix the problem if your ThinkPad is still in warranty.
Or:
Change the fluorescent backlight, which has deceased. The phosporous layer of cold tube has a high spectrum in red, with the other spectra joining in after a few seconds, resulting in white color. this usually happens with aged tubes.
The tube is different sizes in different models. It can be ordered from some supply stores, but not from IBM or Lenovo.

The problem can also be caused by a bad power inverter. The inverter converts the low-voltage DC electricity from the battery to high-voltage AC to drive the fluorescent tube. The inverter failure is often a cause of the red tint in the 600 series ThinkPads. The inverter can commonly be purchased cheaply and is much quicker to replace than the [http://www.bosstar.com/ CCFL] (cold cathode fluorescent lamp).