Latitude 5289 - Not working on known good battery

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Prott
    Senior Member
    • May 2022
    • 154
    • Czechia
    #1

    Latitude 5289 - Not working on known good battery

    Hello friends,
    I am currently troubleshooting a problem with Dell Latitude 5289's motherboard.

    First the laptop had a short on the 5V rail (fixed by replacing a shorted cap). However after that it randomly didn't want to start on the battery power - this got worse to the point that now the laptop won't start when powered by battery at all.

    - The battery is checked and ok
    - If I start the laptop with a plugged charger it shows valid battery data (charge, cycles, etc.).
    - The laptop doesn't have problems charging the battery
    - If I unplug the charger while it is on it immediately shuts down (even if battery is shown as full)

    Recently I also started to experience random shutdowns while powered with a charger.

    Does anybody have an experience with similar type of fault? What could cause it?

    I have a spare board that I can transfer stuff from for troubleshooting, but I would like to first know where to start looking. :-) My first instinct would be to replace the two main mosfets and (if it doessn't help) the charging IC, but the fact that battery is still charging normally is kinda throwing me off.

    Thank you SO much.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13953
      • Canada
      #2
      Re: Latitude 5289 - Not working on known good battery

      Remove all power. Meter in resistance mode. Check the resistance of each and every mosfet in the power path for the adapter; then again for the battery.

      Measure:

      source & drain
      source & gate
      gate & drain

      Post each measurement. Checking for a low resistance value for the mosfet = defective.

      Are you using the official Dell power adapter with the proper rating ?

        Comment

        • Prott
          Senior Member
          • May 2022
          • 154
          • Czechia
          #3
          Re: Latitude 5289 - Not working on known good battery

          Thank you so much mon2!

          I measured some weird readings on one of the two "main" mosfets (that PWR_SRC and CHARGER_SRC). So I decided two just replace both of them - now the laptop is working perfectly.

          The readings were:
          VIN -> Bg = 150+ kohm
          VIN <-> Vsw = 60+ kohm
          Bg -> VIN = inf
          Vsw <-> Bg = inf


          VIN -> Tg = 50+ kohm on the CHARGER mosfet, BATTERY mosfet inf.

            Comment

            Previous template Next

            Related Topics

            Collapse
            • mkdj
              ASUS X571 no power : battery issue?
              by mkdj
              Hello everyone,

              Mark and model: ASUS X571
              Symptoms: not turning on. There is only the LED battery indicator working. The owner of the laptop told me this problem arrived one week after having changed the battery. He then managed to power on the laptop only once, and then it never powered on again.

              Tests already made:
              - Battery is charging when laptop is plugged in. The LED battery indicator turns white after a couple of hours of charge, indicating that battery is fully charged. However, laptop won't turn on anyway, with or without AC plug.
              - I have removed...
              Yesterday, 09:16 AM
            • sam_sam_sam
              Another project idea for a battery bought from Battery Hookup with a good BMS board
              by sam_sam_sam
              https://batteryhookup.com/products/n...-2900mah-cells

              One note these battery packs are below 10 volts and the BMS protection board has locked them off from having any voltage on the BMS output wires I have tested three of them so far and voltage is around 8 volts it not an issue because it testing about 9.2 amp hours

              The price of this offer has gone up sense I bought these two boxes

              I bought two boxes of these batteries but there is a catch to the these battery packs

              The BMS protection board does work but it...
              07-31-2022, 04:07 AM
            • Bowline
              Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
              by Bowline
              My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

              Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

              My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
              The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
              I have tried multiple different Dell power adapters. My Dell...
              06-11-2025, 10:13 AM
            • techfreak9356
              Vostro 3400 (LA-K033P) won't charge battery, everything else ok
              by techfreak9356
              I bought a Vostro 3400 motherboard (LA-K033P) to upgrade over my damaged Inspiron 5593 (LA-J091P) board. Everything else is ok except for the battery. This battery I am using now is already a replacement one since I disposed of the bloated original one. Back in the Inspiron 5593 motherboard, the battery charges fine and is identified just fine. However, with the upgraded motherboard, suddenly the replacement battery is labeled as "Not a dell battery". When I borrow a similar battery from my colleague (which did not have replacements yet), it is identified and charges just fine.
              ...
              09-14-2023, 11:10 PM
            • Document Archive
              DELL Latitude 5289 Hybrid (2-in-1) 5000 Specification for Upgrade or Repair
              by Document Archive
              This specification for the DELL Latitude 5289 Hybrid (2-in-1) can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 5289 boardview and 5289 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for DELL Latitude...
              09-06-2024, 05:59 AM
            • Loading...
            • No more items.
            Working...