asus g752vy power button partially not working

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  • myth77
    Badcaps Veteran
    • Feb 2017
    • 380
    • Croatia

    #1

    asus g752vy power button partially not working

    So, this laptop was broken..i tested it..find short...replaced ite chip and 3/5 voltage regulator and everything is working fine...i tested it and all ok...but...later when i tried to put it together every time i connected touchpad button the red light on the power button was missing (the laptop is working, touchpad is working) just missing that red power button light). And when i unplug touchpad it was there... So whats going on...?
    I measure power led on both side and it is 5,06 V on one side...but when touchpad is connected there is a difference on other side "PWR_LED_CON#_1" ...when touchpad is not connected it is 3,26 V but when connected it is 3,7 V. Ok, so that it is why i dont see red power button light...
    So i inspected touchpad ribbon cable and connector and everything seems fine...i even used a second touchpad button of the same model i have and same...no red light when connected. Oh and i should mention that touchpad button is working fine when connected...only no power light on main button.
    So i use schematic (attached similar model but should be the same) and i found following:
    1. PWR_LED_CON#_1 without touchpad 3,2, with touchpad 3,7
    2. PWR_LED_CON# is on pin 9 of touchpad...should be 0 v but it is 2,8 V. Also it is shorted with 0 ohm resistor to a "PWR_LED_R#" (gate on mosfet see attached picture below)
    3. Without touchpad connected the readings on n mosfet are pin 2,3 0 v, pin 1,4 GND, pin 5,6 are 3,3 V (i believe this is ok, as it shoud be always)
    4. When touchpad connected readings are on pin 5,6 0v, and on pin 2 2,8v, pin 3 3,7 v

    So far i tried check for short (didnt find),replaced mosfet but the same....

    Attached Files
    Last edited by myth77; 09-05-2020, 06:56 AM.
  • myth77
    Badcaps Veteran
    • Feb 2017
    • 380
    • Croatia

    #2
    Re: asus g752vy power button partially not working

    i measure every pin from touchpad button on working and this laptop and only difference is in pin 9 PWR_LED_CON# / PWR_LED_R#...on working laptop is 0 v but on this it is 2,7 V. I am not able to figure how PWR_LED_R# is generated?

    Also i removed resistor R5623 but still on pin 1 - PWR_LED_CON#_1 i have 3,7 v ?!

    Maybe trying to flash bios? i dont know...

    Comment

    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3553
      • slovakia

      #3
      Re: asus g752vy power button partially not working

      that # means it is active when low so 0V.

      Comment

      • myth77
        Badcaps Veteran
        • Feb 2017
        • 380
        • Croatia

        #4
        Re: asus g752vy power button partially not working

        Hi, thx for helping...
        What do you mean "low so 0v"? Can you explain? Do you mean that every signal that has # should be low when power is ok?

        Comment

        • myth77
          Badcaps Veteran
          • Feb 2017
          • 380
          • Croatia

          #5
          Re: asus g752vy power button partially not working

          I removed 0 ohm resistor R5620 and now i have a light on main power button...but problem is still present on the other side signal PWR_LED_CON# which is generated from touchpad button? according to the scheme...but i dont understand how?

          Comment

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