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No Power ACER SWIFT GH4UT LA-L151P 2B (DC or type-C)

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    #1

    No Power ACER SWIFT GH4UT LA-L151P 2B (DC or type-C)

    Hello friends, i'm stuck....

    I have this board not taking current.
    When i plug DC jack, current stop at 1rst mofset and i get 0V on PIN 18 DCIN of IC CHARGE (ISL9238) (i get 0V every pin of IC)

    I don't found any short for now.

    On type C I get CC1 or CC2 at 5V and that's all, no VBUS nothing else...

    I dont know where to look now...

    Any help please?

    I dont find the exact shematic only the 1A version and boardview miss all the line.
    I can post the shematic i have and boardview if you want.

    Thank you!
    Tags: None
  • Answer selected by pc_okay at 10-21-2024, 03:49 AM.
    ADAPDET should be 0V. Will be provided by a switch within the jack. It's the click you hear when you insert the adaptor. It's Acer's way of ensuring the jack is fully inserted before pulling current from the charger.

    Very common fault on Acer's. You can short pin 3 of the jack to ground to confirm, but I'd recommend to replace it. If you aren't comfortable with hot air, use low melt solder (ChipQuik) on the jack and it will just drop out with just heat from the soldering iron.
    • Selected Answer

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      #2
      Post inside of the schematic forum and link it here. Do not post the files here.

      Carefully, measure the voltage to ground on the ACIN pin of the ISL9238 (pin 19).

      Full ISL9238 detailed datasheet is available here:

      2712666.pdf (farnell.com)

      Comment

        #3
        Thank you Mon,

        Link to BV an schematics:
        https://www.badcaps.net/forum/troubl...gh4ut-la-l151p

        I'm noob & curious, so i have some questions: (i attached an image to explain my questions )
        • I see on the schematic 19V_ADPIN after DC jack and i don't see where it goes?
        • And +19V_ADPIN_P2 from where it comes or where it goes?
        • Who open the first mofset (PQ1) ? AC_OFF ?
        I'll check ACIN tomorrow, thank you.
        Attached Files

        Comment

          #4
          Search for the same labels to study the power path flow. Review the datasheet of the same mosfet. It appears to be a P-channel type. This means the gate voltage must be lower than the source / drain pins to enable. They create a voltage divider with the resistors to lower the adapter voltage enable the mosfet. Do review the datasheet as I am not able to fetch it now (at the airport waiting for my next flight).

          Comment

            #5
            Hello again,

            I get 50k ohm on ACIN.
            i don't get how the 1rst P-channel Mofset can open because i always have >18V and the only variable signal in this circuit is the AC_OFF.
            Am i wrong? what i'm missing ?

            Thanks.
            Attached Files

            Comment

              #6
              ADAPDET should be 0V. Will be provided by a switch within the jack. It's the click you hear when you insert the adaptor. It's Acer's way of ensuring the jack is fully inserted before pulling current from the charger.

              Very common fault on Acer's. You can short pin 3 of the jack to ground to confirm, but I'd recommend to replace it. If you aren't comfortable with hot air, use low melt solder (ChipQuik) on the jack and it will just drop out with just heat from the soldering iron.
              • Selected Answer

              Comment

                #7
                Further to the above comments, short the gate pin 4 of pq1 to ground to force the adapter power path. Test and post the results.

                Comment

                  #8
                  I replace the DC-JACK and now it's charging & working with DC-JACK.
                  Thank you a lot, I write this solution on my notes !

                  After charging the battery a little, Type-C worked again.
                  Maybe the USB-C circuit need a little battery power to work? is it possible?

                  Thanks.

                  Comment

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