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Dell XPS 9343 LA-B441P

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    #1

    Dell XPS 9343 LA-B441P

    Hi,

    I would like some help on my wife's laptop Dell XPS 9343 with LA-B441P motherboard.

    AC adapter is not recognized so I bought another used one and still the same !

    It was of course working with the old one the bios was saying 45W adapter but now it says adapter unknown.

    I don't know if the used one is also defective or it's a motherboard issue.

    I have already repaired this laptop to give it to my wife (the PD102 TVS was bad).

    For now what I checked :
    - If i measure old adapter the center pin measure nothing in diode mode so I think the wire it's cut somewhere (so it's normal the laptop does not recognize it). 19v is ok because the laptop can start but not charging battery and the laptop is very slow

    - I measure the used adapter I just receive and the center pin measure 0.280 in diode mode

    So here the voltages on the motherboard when adapter is plugged (the new used one)

    The voltage on PQ100 on pin 1 and 3 is quite low 0.6v ! I think we must have 3.3v here ? Pin 2 is 5v

    So I desoldered PL102 to isolate each part and now I have 3.3v on PQ100 (pin 1 and 3)

    So the only part on the other side of PL102 is the center pin so what does it means ?

    If I put 3.3v on center pin of the ac adapter with my power supply the current is 8mA.

    I replace PD102, PQ100 and PQ101 but still the same.

    Thanks in advance and sorry for my bad english I am french.
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    #2
    To me, the fault appears to be a mechanical issue with the dcin power jack.

    Leave PL102 off the board. Attach the power adapter but do not plug into the ac wall socket.

    Test the center pin in diode mode using the PL102 pcb pad. What is the measurement?

    Comment

      #3
      If the AC adapter draws 8mA the voltage will collapse, no point in troubleshooting a board without a known good genuine Dell AC adapter.
      However a resistor needs to be connected between the supply voltage and the 1-wire ROM, otherwise the 1-wire ROM will try to short full current to ground to send data.
      That said it's also common for PR103 to be damaged.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

        #4
        Originally posted by mon2 View Post
        To me, the fault appears to be a mechanical issue with the dcin power jack.

        Leave PL102 off the board. Attach the power adapter but do not plug into the ac wall socket.

        Test the center pin in diode mode using the PL102 pcb pad. What is the measurement?
        So I remove PL102 and in diode mode red on ground and black on PL102 pad (side of the center pin) I measure 0.165 same if I measure directly on the adapter center pin so good connection from PL102 pad to center pin.

        Comment

          #5
          Originally posted by piernov View Post
          If the AC adapter draws 8mA the voltage will collapse, no point in troubleshooting a board without a known good genuine Dell AC adapter.
          However a resistor needs to be connected between the supply voltage and the 1-wire ROM, otherwise the 1-wire ROM will try to short full current to ground to send data.
          That said it's also common for PR103 to be damaged.
          I will try to replace PR103 even if the value is 33 ohm on the board.

          I think the used ac adapter I bought is faulty too

          Comment

            #6
            I forgot I have a AC adapter from a Dell Optiplex, test it and it works !

            Never trust a seller !

            Thank you for your help.

            Comment

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