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Thread: lilliput backlight pinout for manual dimming

  1. #11
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    hooray!!
    thanks a lot bbalazs and turbocad6
    the hump on the capacitor is not really there, total flat

    I would measure the voltage today
    The monitor can change brightness but I am not sure it's backlight intensity, since my xenarc has the backlight intensity and brightness option on the osd
    While the lilliput only has brightness

    Do you think it will work?

  2. #12
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    don't know if this helps, but on my EBY701 pressing the ">" button scrolls through the brightness settings (without needing to go into the OSD). if your 629 does the same thing then you could wire a switch to that button to easily switch brightness levels with one button push. good luck

  3. #13
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    Quote Originally Posted by ComputerGeek View Post
    don't know if this helps, but on my EBY701 pressing the ">" button scrolls through the brightness settings (without needing to go into the OSD). if your 629 does the same thing then you could wire a switch to that button to easily switch brightness levels with one button push. good luck
    Thanks for the idea.
    The 629GL does the same thing.

    But I removed the whole button to make it fit into my dash, and there are no space to relocate the buttons.

  4. #14
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    Okay, I tested the voltage between pink and white wire
    It was 9.5volt no matter the brightness level was.

    I might just relocate the button to the very back of the screen and wire a little switch connected to the -> button. (thanks to computerGeek for the inspiration)

  5. #15
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    Hmm, three white LEDs chained serial...
    If the voltage does not vary with 'brightness', I suppose, it also operates with the panel alone...
    Is there any 'leak' on the display (eg. sideways), where the original brightness could be judged during dimming?

  6. #16
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    Quote Originally Posted by bbalazs View Post
    Hmm, three white LEDs chained serial...
    If the voltage does not vary with 'brightness', I suppose, it also operates with the panel alone...
    Is there any 'leak' on the display (eg. sideways), where the original brightness could be judged during dimming?
    yes there are some leaks, the led brightness didn't changing at all when I changed the brightness on OSD.

  7. #17
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    for normal CFL based lilliputs, is it possible to dim the backlight using the lilliput inverter? I don't remember ever hearing of someone that's been able to do it. I just assumed it wasn't possible.

    I have an 889gl that's far too bright at night, it would be great to be able to dim the backlight without too much modification

  8. #18
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    What is the "Auto-Dimmer"-Option at CarTFT.com-Shop?? I need also a Auto-Dimmer-Function!

  9. #19
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    I did it on my LCD TV, because the problem was the same: it was too bright at night AND the backlight does not change with dimming, but the panel did.
    I cut the wire on the panel that went to the CCFL drive (two transistors via a coil) and put a small smd PCB made by me, it contains a small FET and a PIC with a transistor (because it is a P-FET) That 10F206 PIC just works as a PWM, concerning the two input pins, making four possible PWM (100%, 50%, 25%,10%).
    Below 10% it is tending to flash and being unstable.

  10. #20
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    Quote Originally Posted by bbalazs View Post
    I did it on my LCD TV, because the problem was the same: it was too bright at night AND the backlight does not change with dimming, but the panel did.
    I cut the wire on the panel that went to the CCFL drive (two transistors via a coil) and put a small smd PCB made by me, it contains a small FET and a PIC with a transistor (because it is a P-FET) That 10F206 PIC just works as a PWM, concerning the two input pins, making four possible PWM (100%, 50%, 25%,10%).
    Below 10% it is tending to flash and being unstable.
    sounds too complicated too me (and mine is not ccfl anyway).
    I will try just using the monitor brightness control and see if that's enough dimming for me.

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