la-j081p charging issue

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  • ahmarzo
    Senior Member
    • Mar 2015
    • 168
    • india
    #1

    la-j081p charging issue

    Have Dell la-j081p laptop with battery issue.
    First the laptop was not charging pqb25 was short after changing pqb25 and pqb26 the laptop starts charging and runs properly on charger but battery it shutdown after 10 seconds.
    And when powered on only on battery the laptop turns off after 8-10 second without giving display.have tried another battery on another working laptop and it's working fine
    I have changed charging ic and pqb25 ,pqb26 and pqb13.
    When adapter is disconnected the laptop stays on battery for 8-10 sec then abruptly shutdown everytime.
    This is the link for schematic https://www.badcaps.net/filedata/fetch?id=2077307.
    Please help thanks in advanced
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13829
      • Canada
      #2
      have tried another battery on another working laptop and it's working fine
      Have you tested another known good battery on this laptop?

      Remove all power. Meter in resistance mode. Measure the resistance between pins #1 and #2 on the charger IC @ PUB01. Test directly on the IC pins with the meter probes. Checking if the full path resistance matches the schematic value. If they do not, the charger IC believes there is a fault in the battery pack and powers down. The battery may be just depleted but the adapter is not charging the battery.

      What is the resistance in ohms?

        Comment

        • ahmarzo
          Senior Member
          • Mar 2015
          • 168
          • india
          #3
          Thank you mon2.pin 1 and 2 was showing 200 ohms as resistor value was changed after changing it to 0 ohnes the laptop is working on battery.thanks again

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13829
              • Canada
              #4
              Good. Suggest to use the values as defined by the schematic otherwise the excessive current draw from the battery pack will not be sensed properly. The charger IC is expecting to have onboard the values showing in the schematic.

                Comment

                • ahmarzo
                  Senior Member
                  • Mar 2015
                  • 168
                  • india
                  #5
                  Yeah changed from same part no scrap motherboard.thanks for the suggestion.

                    Comment

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