CF28 12.1" screen backlit

[dukeluca86]

Hello, my cf28's backlit lam is going down and i'm planning to change it with a stripled of white led, but before i open it, do you know what's the measures of the space under the screen, where is the original lamp housed, i think that it should be about 2 or 3 mm, do you know ?

[gray-beard]

Take a look at this page

LB LED Backlight|LCDPARTS.net

Might be of help to you

Bob

[ADOR]

Changing from CCFL to LED Display

Here is the thread where they worked on this before, but with a CF-29.

[MasterBlaster2039]

Is it easy to do this LED fix, or do you have to be a pro-expert in hardware modifications ? Oh, and if you replace the CCFL with LED, is it better for the battery to last longer ?

[onirakkiss]

It depend on ur skills , for me it is an easy task. Small mechanic, the principles of optic and electronic and the usage of an soldering iron and an multimeter should be a hobby and u need to be patient and organized.
LEDs needs less current/power, if they have the same brightness like the original used CCFL.

[dukeluca86]

Ok, i'm working on it, today i removed the original lamp (without brocking it) and made place to housing the leds.
I bought from a chineese shop (here very cheap) 36 leds in smd format, it made a beautiful light, using only 200mA counte the about 1A of the ccfl, and it's directional, so it should be better, and of course tougher than a glass lamp.

[Springfield]

Great job! That's a fine mod I'd love to try someday. Does it have better colors now? The 12.1" transflective screens are known for having washed-out colors without much red etc. Do the bright LEDs help the color balance?

[dukeluca86]

No, not very much at least, the problem is that the transflective panel, block some portion of the red emission of the lamp, so for a good balance you should put a led that have a reddish filter on it, but it's very hard to find and much more hard to find the correct ratio of filtering.

It just made a brighter image, and a more crisp white, anyway i'm not satisfied of the result, in particular in the bottom margin of the screen, you can see the spottish effect of the led, i think that some kind of diffusing media should be used to diffuse the light in a better way.

[onirakkiss]

... anyway i'm not satisfied of the result, in particular in the bottom margin of the screen, you can see the spottish effect of the led, i think that some kind of diffusing media should be used to diffuse the light in a better way.

I had used an harder plastic foil from an envelope which I (my girlfrind) maked milky with sandpaper to create an diffuser strip in front of the leds.

[dukeluca86]

I've to give it a try.