Need capacitor values and working voltages - Dell 2408WFPb

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  • 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
  • jasonbay13
    Dell Inspiron 15-3521 ~ LA-9104P ~ No Power - corroded board with pics of damage and some voltages
    by jasonbay13
    it was working yesterday, i opened it up and saw this mess. boardview and schematic uploaded for convenience.

    PU200
    pin 17 vreg5 = 0v ~ solder joint was corroded and flicked right off with my probe, was able to get clean and reflow, rest look fine.
    pin 8 vreg3 = 0v
    pin 13 en = .2v
    pin 1,6 entrip1,2 = 0v

    b+ and b++ = 19.5v
    +5valw = 0v & 25+ohm to ground
    +3valwp = 0v & 25+ohm to ground


    i cleaned the board up just a little and can get more pics.​
    where should i be looking? thx...
    09-25-2025, 10:54 PM
  • Akhlz001
    Dell Pro 13 Plus PB13250 Bios Unlock
    by Akhlz001
    Hi,

    Could someone help trying to unlock this BIOS, seems that Dell have changed the layout of new Dell Pro 8FC8 bioses from checking HXD - 4000 bits do not need changing, only 2000. However after FF the section starting from '01000' upto 2000 bits and then soldering the chip back it seems that the microchip on the motherboard is recovering the bios back to original settings after first boot. Has anyone found a way to crack this extra layer of security Dell have implemented? Seems both HP and Dell have upped bios security to match Lenovo by implementing extra measures on a separate...
    09-20-2025, 07:15 PM
  • Rosen Anastasov
    Dell XPS13 9370 with LA-E671P motherboard - power issues, no 3.3V and 5V always on voltages
    by Rosen Anastasov
    The computer is the one in the subject. Dead. So dead, that no button, no nothing works. Zero signs of it being live until I open it.

    What's verified - the B+ voltage is there at 8.4V.

    Battery is probably dead, cause it was a bit over discharged (to 6V). I forcefully charged it directly on the cell terminals to 3.8V per cell. Now it has voltage on the output connector, but it is 7.1V, not 7.6V. Even when connected to the motherboard it doesn't charge. But will look at that later.

    The +3VALWP and +5VALWP voltages are missing. Traced them to PU500 and PU501....
    08-01-2025, 06:06 AM
  • master3112
    Dell Inspiron 5590 Board 18778-1 no charging, charging not possible
    by master3112
    I would like to share my experience about charging issues with Dell power supplies with the tech community. I am working on a Dell Inspiron 5590, Mainboard 18778-1 with charging problems. The device can be switched on and works so far, only the message appears at startup:

    Alert! The AC power adapter wattage and Type cannot be determined. The battery may not change. The System will adjust the performace to match the power available.

    The power supply unit is not recognized in the Bios and the charging process is set to "idle". I use original Dell battery, type...
    07-29-2025, 01:55 PM
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