Modifying a Raspberry Pi dislay



  • Hi All,
    I got this 5" raspberry pi display, XPT2046 Touch Controller. Currently it has a hardware backlight on/off switch and i'm looking to change that to be able to turn on and off the backlight using a script from raspberry pi.
    I am looking for an always on gate that i can control through a pin. My initial thought was to place a tranzistor, but not sure if that will work. Any other ideas ? how can i achieve this really simple and easy ?

    image1.jpeg

    image0.jpeg

    Regards
    Adrian.



  • so, nobody can help me with this issue ?



  • @ady_e_n Presumably a low current DPDT switch.
    Since I have them anyway I'd be using a latching DPDT signal relay fired by two logic level mosfets controlled by two pins, hence emulating the switch itself with no running current. The relays I have are NEC EE2-3TNU around 7mm thick and 9mm tall, 5v version should be available if that is your logic voltage level.
    If space permits you could hot glue the relay to the board on it's side with the mosfets/resistors/3 pin control mounted onto it's base, hard wired to the original switch pads.
    😉


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