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    CF28 12.1" screen backlit

    Discussion in 'Panasonic' started by dukeluca86, Aug 21, 2012.

  1. dukeluca86

    dukeluca86 Notebook Consultant

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    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 ?
     
    dukeluca86, Aug 21, 2012
    #1
  2. gray-beard

    gray-beard Notebook Evangelist

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    gray-beard, Aug 21, 2012
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  3. ADOR

    ADOR Evil Mad Scientist

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    ADOR, Aug 21, 2012
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  4. MasterBlaster2039

    MasterBlaster2039 Notebook Evangelist

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    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 ?
     
    MasterBlaster2039, Aug 22, 2012
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  5. onirakkiss

    onirakkiss Notebook Deity

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    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.
     
    onirakkiss, Aug 22, 2012
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  6. dukeluca86

    dukeluca86 Notebook Consultant

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    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.
     
    dukeluca86, Aug 23, 2012
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  7. Springfield

    Springfield Notebook Deity

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    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?
     
    Springfield, Aug 23, 2012
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  8. dukeluca86

    dukeluca86 Notebook Consultant

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    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.
     
    dukeluca86, Aug 28, 2012
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  9. onirakkiss

    onirakkiss Notebook Deity

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    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.
     
    onirakkiss, Aug 28, 2012
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  10. dukeluca86

    dukeluca86 Notebook Consultant

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    I've to give it a try.
     
    dukeluca86, Aug 28, 2012
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