Lenovo IdeaPad Flex 5 motherboard LC56-14T no display on screen

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  • koby058
    Badcaps Veteran
    • Jan 2017
    • 375
    • israel
    #1

    Lenovo IdeaPad Flex 5 motherboard LC56-14T no display on screen

    Hi people,

    schematic: https://www.badcaps.net/filedata/fetch?id=3204734

    I have this laptop, it is working an posting but there is no display on the screen.
    external screen works
    inspecting voltages on lcd connector: main power rail present, 3D3V_LCDVDD_S0 present, LCD_SELF_TEST_ON_EC not present, SENSOR_LID_OPEN_N
    and LID_CLOSE_N both have 3v

    different lcd same issue

    Can you help me debug it ?
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Check voltage on 19V_DCBATOUT_LCD/BL_EN/_LCD_BRIGHTNESS. Check with a flash light whether its a dimm display issue or no display issue on internal screen.

        Comment

        • koby058
          Badcaps Veteran
          • Jan 2017
          • 375
          • israel
          #3
          Hi, thanks for your reply

          main power rail 13v
          19V_DCBATOUT_LCD 13v
          BL_EN 0v
          _LCD_BRIGHTNESS 0v

          as i can see BLON_OUT is not cmming out of pin 27 of EC

          with flashlight no display that i can see

          how do you suggest to continue?
          Last edited by koby058; 11-11-2024, 11:10 AM.

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