Monitor ccfl to led

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  • karmele
    Member
    • Oct 2016
    • 39
    • spain

    #1

    Monitor ccfl to led

    Hi all experts,

    I will try to explain clearly what I want to do and the doubts I have.
    This is a Viewsonic monitor for years that have broken the lamps and finding no replacement we have decided to put LED strips.
    We have the DC / DC controller bought in Aliexpress that as you know comes with four cables (VIN, GROUND, ON / OFF AND DIM) to solder on the monitor board.
    I have seen many videos and I have the general idea of what to do but my doubt is that I can not find the right voltage to solder on the board the VIN cable. I only see 12V, 13V and 25V.

    I explain what I have done so far:
    VIN: I have soldered it to 25V in different places of the monitor board (I tested with 12 and 13V but they do not turn on the led) this connector board does not have the pin for VIN
    GROUND: to pin ground on connector
    ON / OFF: to pin ON / OFF of the connector that has 0.12V (is this enough voltage?)
    DIM: to pin BRIGHT of the connector that has 3.28V

    Well, what I have achieved is that I turn on the monitor that I have connected to the laptop, but the image I see is as if it had a lot of brightness but like fog, which means that the icons are not seen at all and what there is in the screen. I know I have not explained myself well and you will not understand me but it is difficult to explain.

    So it is clear that somewhere I screwed up, either in the 25V of the VIN, either in the rest of voltages or maybe that as I read somewhere should have disconnected some mosfets and some capacitor on the board.
    The help that I am asking for is that you tell me exactly where on the board I should solder the different wires of the regulator.
    And this is where I ask for your help so you can guide me by giving me ideas and suggestions.
    I send photos of the board on both sides, photos of the DC / DC controller, photo of the monitor model and also if you need I have the PDF of the monitor available.

    Well, I thank all those experts who lend themselves to help.
    Regards.
    Attached Files
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30917
    • Albion

    #2
    Re: Monitor ccfl to led

    vin = 12v

    leave dim unconnected.
    the off/on pin needs gnd or atleast 3v - i cant remember witch.
    for a test try connecting that pin to 3.3v or 5v to see if the leds come on.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Monitor ccfl to led

      Originally posted by karmele
      Hi all experts,

      I will try to explain clearly what I want to do and the doubts I have.
      This is a Viewsonic monitor for years that have broken the lamps and finding no replacement we have decided to put LED strips.
      We have the DC / DC controller bought in Aliexpress that as you know comes with four cables (VIN, GROUND, ON / OFF AND DIM) to solder on the monitor board.
      I have seen many videos and I have the general idea of what to do but my doubt is that I can not find the right voltage to solder on the board the VIN cable. I only see 12V, 13V and 25V.

      I explain what I have done so far:
      VIN: I have soldered it to 25V in different places of the monitor board (I tested with 12 and 13V but they do not turn on the led) this connector board does not have the pin for VIN
      GROUND: to pin ground on connector
      ON / OFF: to pin ON / OFF of the connector that has 0.12V (is this enough voltage?)
      DIM: to pin BRIGHT of the connector that has 3.28V

      Well, what I have achieved is that I turn on the monitor that I have connected to the laptop, but the image I see is as if it had a lot of brightness but like fog, which means that the icons are not seen at all and what there is in the screen. I know I have not explained myself well and you will not understand me but it is difficult to explain.

      So it is clear that somewhere I screwed up, either in the 25V of the VIN, either in the rest of voltages or maybe that as I read somewhere should have disconnected some mosfets and some capacitor on the board.
      The help that I am asking for is that you tell me exactly where on the board I should solder the different wires of the regulator.
      And this is where I ask for your help so you can guide me by giving me ideas and suggestions.
      I send photos of the board on both sides, photos of the DC / DC controller, photo of the monitor model and also if you need I have the PDF of the monitor available.

      Well, I thank all those experts who lend themselves to help.
      Regards.
      You should stick to ONE thread.
      https://www.badcaps.net/forum/showthread.php?t=72875
      Making two thread is not going to help, it just causes more confusion.
      Last edited by budm; 11-08-2018, 10:55 AM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

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