Acer Aspire 5552G power short

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  • Retrocomputer
    Member
    • Aug 2012
    • 47
    • Italy

    #1

    Acer Aspire 5552G power short

    Hi!
    I need some help for the laptop specified in the title.
    It's owned by a friend of mine. At first, it started displaying only a black screen and fan spinning. Then he tried doing an homemade reflow on the VGA BGA. After that, it could be turned on every time for a short second with no fans nor anything (LEDS only), then shutting down (just before shutting down you can hear a slight pop on the board, source unidentified). After three or 4 attempts, he said the laptop squealed for a moment the shut down forever. Now it shows no signs of life with the AC adapter connected, the B+ shows almost short to GND (2.6 Ohms).

    Mobo NEW75 LA-5911P. Schematics here: http://www.rom.by/files/compal_la-59...schematics.pdf

    How can I go on diagnosing the fault?

    Thank you so much!!
    Davide
    Last edited by Retrocomputer; 11-20-2019, 06:36 PM.
  • surecando
    Member
    • Nov 2019
    • 14
    • Australia

    #2
    Re: Acer Aspire 5552G power short

    MOSFETs gone

    Comment

    • Retrocomputer
      Member
      • Aug 2012
      • 47
      • Italy

      #3
      Re: Acer Aspire 5552G power short

      Thank you. Now it behaves differently. I found PQ38 shorted, replaced it and now we're like before. As soon as you press the power button (with AC adapter), the LEDS come up for a brief second then it shuts down, making a slight click/pop from an unidentified place on the MOBO. The three main always on voltage rails (+5,+3.3,+1.1) are present and constant upon connecting the adapter.

      Thank you.

      Comment

      • surecando
        Member
        • Nov 2019
        • 14
        • Australia

        #4
        Re: Acer Aspire 5552G power short

        Check your power supply see how many amps it's drawing without turning on, if it's drawing amps, you should feel which part is getting hot

        Comment

        • piernov
          Super Moderator
          • Jan 2016
          • 4435
          • France

          #5
          Re: Acer Aspire 5552G power short

          GPU reflow → dead. You already know where the fault lies.
          This is gonna have a dead northbridge anyway.
          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

          Comment

          • Retrocomputer
            Member
            • Aug 2012
            • 47
            • Italy

            #6
            Re: Acer Aspire 5552G power short

            Hi, just for curiosity sake I decided to remove both the IGP and the VGA. (Then reinstalled a couple reballed ones). The short is still there. PQ38 is shorted at D/S terminals (B+/+VGACOREP), no power at all now. PR124 to 127 become slightly hot. PQ31-33-34 already checked and not shorted. It's just to see if it lives again... thank you.

            Comment

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