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Replace CCFL backlight with LED strip

Discussion in 'LEDs and Optoelectronics' started by Jerryplan, Feb 23, 2017.

  1. Jerryplan

    Jerryplan

    4
    0
    Feb 20, 2016
    Hi, i have a LG flatron W1942TE which turns off after few seconds. I changed already once the CCFL backlight 5 years ago. So i have decided to replace them by some LED strips, a kit which comes with the driver.
    Now my questions are:
    - Is it possible to connect the LED driver on the board?
    If yes:
    - where can i get my 12V supply for the LED driver on the board?
    - Do i need to remove the inverter transformer?
    - Regarding the DIM signal, on the power board there is ADIM an BDIM. Which one should i choose?
    - Regarding the ENA signal, I should be able to get from the EN pin on the board?

    So if someone could help me, that would be great.

    cheers!
     

    Attached Files:

  2. Externet

    Externet

    710
    145
    Aug 24, 2009
    Done that; to another brand.

    The important part is dimensional fitting. The LED strip must fit in the removed CCFL groove without chance for short-circuiting traces. The directionality of the light emission should be taken in account for proper illumination. Some convenient strips are 'edge-lit'
    Do not expect smooth and uniform lighting in such adaptation. Depending on the LED emission angle, spotty light sources of individual LEDs may show, as the difussers are designed for CCFL, if that is of importance to you.

    There is 12V available at the inverter input power connection. The inverter circuit can be removed. Dimming functions can be implemented if a driving circuit is implemented, if you care about that. If there is any CCFL current sensing, should be managed to ignore. Perhaps the kit shows instructions.

    Do not run the LEDs at its maximum rated current for longevity. If more light is desired, choose another strip.
     
  3. Jerryplan

    Jerryplan

    4
    0
    Feb 20, 2016
    Thanks Externet!
    Fitting the strips was pretty straight forward as i changed the CCFL once before. I wasn't sure where to get the supply from. Found 12V before the inverter and I soldered the ENA wire from the LED driver to the EN pin on the power board. I powered up and the backlight is working. Now i'm not to sure where to connect the DIM wire from the LED driver onto the powerboard.
    Does anyone know why there is a ADIM and BDIM?

    cheers!
     
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