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    Converting CCFL to LED (*yet another thread)

    Discussion in 'Panasonic' started by interestingfellow, Mar 11, 2019.

  1. interestingfellow

    interestingfellow Notebook Deity

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    I'm sorry for all the posts.
    I only have my pohne to do research on right now, as my 30's backlight is no longer working.

    I want to convert the backlight to LED and can not find a solid answer in the other conversion threads if we found simple driver solution for the LED's.

    I am looking at these leds and trying to figure out with what to drive them.

    I see there is a logic inverter and pull up resistor required to get dimming working.

    Also, I"m in hotels for another 3 weeks, thought I have most of the necessary tools with me to do the work.
     
    interestingfellow, Mar 11, 2019
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  2. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    There may be a slight issue that the driver board you linked works from 9-30v.
    CF 30's use 5v to drive the ccfl board.
    LED's work more on current than voltage so it may not matter that much. Experiment and see.

    6a.jpg
     
    Shawn, Mar 11, 2019
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  3. interestingfellow

    interestingfellow Notebook Deity

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    Thank you!

    Is there a soirce for a more appropriate driver board? The link i posted can be here is 2 days (huge sellingbpoint for me)

    Trying to do refined ssuper specofic searches on my phone yeilds sucky results
     
    interestingfellow, Mar 11, 2019
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  4. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    Shawn, Mar 11, 2019
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  5. interestingfellow

    interestingfellow Notebook Deity

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    iMuchas gracias, me ayuda mucho!

    Is there not a 12v-30v rail somewhere in the lid that can be tapped? Or, in the main chassis? My only concern would be a ground loop/etc.
    I'm assuming that the people here smarter than I have already looked at this idea, but it seems foolish not to ask.
     
    interestingfellow, Mar 11, 2019
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  6. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    Not in the lid. 5v only as far as I know.

    I can send electrical cartoon to you when I get home.

    If I understand correctly, the 9-30v driver will run on 5v but you will lose a little brightness. I might be wrong as I am not an engineer.
     
    Shawn, Mar 11, 2019
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  7. ADOR

    ADOR Evil Mad Scientist

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    I was thinking that as well as I scrolled down. The Mk3 is already upgraded from the factory. Just swap your ram, drive and other accessories over. Then you can sell your other stripped unit to get some of your money back. (just keep stuff like the power and usb port covers)
     
    ADOR, Mar 11, 2019
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  8. interestingfellow

    interestingfellow Notebook Deity

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    Wait... I have an MK3...cf30ktpax2m

    Is that already LED? i thought it was ccfl? I'm having a hard time using my phone to do all this.

    How much are MK3 barebones units amd from where? I can fix this for will under $50.
    If I were to spend any more than that I would start looking at a 31 or FZG1. Plus the frugal bass turd in me can't stand the thought of not fixing an almost perfectly fine TB

    Thank you,all, again!
     
    interestingfellow, Mar 11, 2019
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  9. SHEEPMAN!

    SHEEPMAN! Freelance

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    Remember to pull battery. There is a live wire in the lid that will pop fuses.
    Forgot where I read that.
     
    SHEEPMAN!, Mar 11, 2019
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  10. interestingfellow

    interestingfellow Notebook Deity

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    Before I break something....
    Does this look right?
    Where do I put the pullup resistor? Does the value matter? (I know generally speaking that
    1kohm is good for voltage verse current)
     

    Attached Files:

    Last edited: Apr 1, 2019
    interestingfellow, Apr 1, 2019
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  11. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    your attached image is upside down
     
    Shawn, Apr 1, 2019
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  12. interestingfellow

    interestingfellow Notebook Deity

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    dernit
     

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    interestingfellow, Apr 1, 2019
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  13. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    It appears correct to me, but I am not an engineer. Although I did drive a train once.
    Your labels on the input side confused me. It appears that your are connecting the pos,neg, and enable lines together.

    Do you want to use a resistor to control brightness?
     
    Shawn, Apr 1, 2019
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  14. interestingfellow

    interestingfellow Notebook Deity

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    I'm assuming CF-30 ENA is PWM. My signal inverter is a transistor type, so it requires vcc, gnd, and pwm in to output invterted signal

    LED driver ENA requires +5v to turn it on. I'm assuming CF-30 5v vcc is on all the time?

    My brain is fried trying to keep track of what's on when things are off and vice versa.
    And then sprinkle in some inversion to compensate....meh.
     
    interestingfellow, Apr 1, 2019
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  15. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    try a search.
    I think this has been covered here before. I cant recall for sure if it was this board or not.
     
    Shawn, Apr 2, 2019
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  16. interestingfellow

    interestingfellow Notebook Deity

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    well, chit.

    I don't remember what the loose wire is.
    Does anyone know?
     

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    interestingfellow, Apr 3, 2019
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  17. Shawn

    Shawn Crackpot Search Ninja and Options Whore

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    For touchscreen PCB?
     
    Shawn, Apr 3, 2019
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  18. interestingfellow

    interestingfellow Notebook Deity

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    ...it's a good thing I checked polarity before I started hooking stuff up.

    CF30 ouputs 12v to CCFL inverter!
     

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    interestingfellow, Apr 3, 2019
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  19. interestingfellow

    interestingfellow Notebook Deity

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    Nope. different connector and TS baord already has its cable.

    Maybe for a different CCFL board?
     
    interestingfellow, Apr 3, 2019
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  20. Rob_

    Rob_ Newbie

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    Hi Folks, I'm trying to get my ducks in a row ready for CCFL/LED conversions on, I think, three failed CF30's I have. I've gotten myself a bit confused with the information in this thread:

    it is mentioned there is a 12v supply to the CF30 CCFL inverter but earlier in the thread
    a diagram of the 8 pin connector does not show this. Is the diagram wrong or am I getting mixed-up
    with the connectors?
     
    Rob_, Jun 8, 2019
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  21. interestingfellow

    interestingfellow Notebook Deity

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    I did measure 12v on that connector.

    Unfortunately, I did not complete the modification as I acquired a couple FZG1's!
    I do have an extra cf30 lid that I will eventually install so that 30 is operational because I don't have time to mess with it.
     
    interestingfellow, Jun 18, 2019
    #21