Surface pro 4 backlight issue

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  • incorrect
    Member
    • Nov 2017
    • 22
    • Greece
    #1

    Surface pro 4 backlight issue

    Hello all,
    a dead surface pro 4 arrived at my place some days ago.
    It had a blown fuse (0ohm Resistor) and i replaced it.
    After resistor replacement, i connected the display and checked the device and the device turned on. i just unplugged the power at surface logo and assembled the device back.
    After that, i turned on the device again but no backlight at all. The LED Driver IC - MP3388s Vin is 0.35v before power on and 1.5v after turn on but still not enough to turn on the LEDs i think, as the driver ic needs 4.5V+. I see some spikes from 1.5V to 4V some times but still nothing.
    Also, i found that the battery schottky diode was blown aswell and i replaced it.
    Seems like a failed MP3388s. no?
    Any idea?

    Thank you
    Tags: None
    • incorrect
      Member
      • Nov 2017
      • 22
      • Greece
      #2
      Re: Surface pro 4 backlight issue

      Back to my own post, i just removed the MP3388S and the voltage on Vin came back to 8.5V. So it seems that the Driver ic failed. Waiting for the new one to replace it.

        Comment

        • schmitte
          New Member
          • Oct 2021
          • 2
          • Deutschland
          #3
          Re: Surface pro 4 backlight issue

          Hello @incorrect !

          Did you solve the problem? I have the same issue. Please help. Thank you

            Comment

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