ACLU1/ACLU2 UMA NM-A272 REV 1.0 blinking led light

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  • kalilinux25
    Badcaps Legend
    • Mar 2018
    • 2084
    • ZAMBOANGA SIBUGAY
    #1

    ACLU1/ACLU2 UMA NM-A272 REV 1.0 blinking led light

    When I test on the PU1207 chip the Pin 13 is shorted to ground




    and I dont have +1.3v and +3VALW



    When I plug the charger the led blinks and blink


    how can I find the short ?
    Tags: None
    • khaahk
      Badcaps Veteran
      • Dec 2013
      • 759
      • Estonia
      #2
      Re: ACLU1/ACLU2 UMA NM-A272 REV 1.0 blinking led light

      1. Sorry but the pictures are too small to be of any help
      2. Which led are you talking about (charger led, mainboard led, battery charge led?)
      3. 1.35V you get after power on for RAM, the controller that you are looking at has nothing to do with 3V and 5V. Look for PU904 (integrated SMPS with inbuilt transistors) which is generating 3V and PU905 for 5V respectively.

        Comment

        • mielta
          Badcaps Veteran
          • Apr 2015
          • 368
          • Germany
          #3
          Re: ACLU1/ACLU2 UMA NM-A272 REV 1.0 blinking led light

          Hi
          Open Jumper PJ316 + PJ317 and see witch side is shorted.

          Remove the ram to check if they are shorted

            Comment

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