https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=Kjfisher 2026-05-16T18:40:19Z User contributions MediaWiki 1.31.12 https://www.thinkwiki.org/w/index.php?title=Problem_with_red_tinted_display&diff=26487 2006-11-21T15:36:25Z

<p>Kjfisher: /* Affected Models */</p> <hr /> <div>Information about the problem of red tinted display corners in T23 ThinkPads.<br /> <br /> ==Problem description==<br /> 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.<br /> <br /> The red tint is strongest when the screen is first switched on and it will fade away with the time your ThinkPad is running.<br /> <br /> ==Affected Models==<br /> *ThinkPad {{A22p}} (2629-Y2U, 15.0&quot; TFT display with 1600x1200 resolution) <br /> *ThinkPad {{A31p}} (2653-H4U and similar with high resolution displays)<br /> *ThinkPad {{T21}} {{T23}} (with high resolution (SXGA) displays)<br /> <br /> ==Affected Operating Systems==<br /> *all<br /> <br /> ==Status==<br /> It is not clear which component (screen/backlight/inverter) exactly is responsible for this.<br /> <br /> ==Solutions==<br /> You can have IBM fix the problem if your ThinkPad is still in warranty.<br /> Or:<br /> 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.<br /> The tube is different sizes in different models. It can be ordered from some supply stores, but not from IBM or Lenovo.<br /> <br /> 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).</div>

Kjfisher