I just did the upgrade to go from an 1280x800 CCFL to an 1440x900 LED as I was finding the lower resolution screen too restrictive.
It is a very easy mod, albeit with the usual stumbling blocks as I could not find any note of it having been done before on the web.
The video cable from the motherboard to the screens is different.
The CCFL screen has 2 connectors, one to the screen and one to the inverter which sits beneath LCD panel. The inverter is also connected to a branch off the video cable which comes from the motherboard up through the left hand hinge.
The LED screen has a single connector, and its, different, video cable to motherboard, has a shorter voltage regulator which sits beneath the LED panel, just to the right of the left hand hinge. There are screw holes for mounting either inverter/regulator from respective video cables, in the same place.
The first LED panel which I tried was not compatible, it gave the dreaded black screen - very barely visible picture. This was either an incompatibility, just bad luck of a bad screen, or somehow the panel EDID was defective/not set up for , and works perfectly with the different video cable. The same panel works with both Intel and Nvidia GPU.
Should note that for the E6400 at least, both lids work vice versa, although the CCFL lid needs slight modding to take the LED panel and the plastic bezel is a little thinner on the lower side between the CCFL and the LED, so for looks I also got a lid/bezel.
I am posting this here as most of the google hits went to posts on the forum, but there was nothing specific I could find on the E6400, and hope this saves others some time.
The screen that works is an LG
LP141WP2 (TL) (A1) 14.1" WXGA+
and its (subjectively) a better resolution for the laptop size. I have not done any image correction so far, but between them the LED is much brighter, and the whites are more yellow. The CCFL (at standard settings also) was a bluer white.
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