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Dell not charging battery LAF115P Battery and PSU Original

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    Dell not charging battery LAF115P Battery and PSU Original

    Hi guys I have a DELL that does not charge.
    I bought new original battery and charger and when it turns on the percentage of charge drops.
    here is the link to the diagram:https://www.badcaps.net/forum/troubl...oogle_vignette
    I checked that on the +SDC_IN pin I have 19.8V
    on ISL9538HRTZ
    Pin 17 = 19V
    Pin 18 = 5V
    Pin 19 = 3.6V
    Pin 21 = 3.1V
    Pin 22 = 3.1V
    Pin 24 = 3V
    PQB03 PIN1 13.5V
    PQB03 PIN5 13.30
    PQB04 PIN4 13.52

    all tests without battery connected, only motherboard on the bench.
    What do you recommend?
    When I connect the battery on PQB03 PIN5 10.5V but the status LED never turns orange, it stays off.
    Can you help me?

    #2
    PQB03 PIN1 13.5V
    PQB03 PIN5 13.30
    PQB04 PIN4 13.52
    Remove all power. Disconnect the battery. Meter in resistance mode.

    Measure the mosfet @ PQB03 as follows:

    source (1-2-3) & drain (5-6-7-8)
    source (1-2-3) & gate (4)
    gate (4) & drain (5-6-7-8)


    Post each measurement. Each measurement should be hundreds of k ohms or higher else the mosfet may be defective.

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      #3
      source (1-2-3) e drain (5-6-7-8) 3.5Mhom
      source (1-2-3) e gate (4) 3.3Mhom
      gate (4) e drain (5-6-7-8). 10Mho

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        #4
        PU1,pin5 voltage present?
        PS_ID present?

        Comment


          #5
          Hi guys with better control I found the problem! a suppressor diode had exploded on the control line of the charging connector exactly PD1.
          Thanks for the help to everyone!!
          Attached Files

          Comment


            #6
            I knew this and thats why pointed you towards PS_ID. Very common fault on this particular MB. Repaired more then 10 mb with exact same fault.

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