Dell SE198WFP Inverter Mosfets

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Rtech
    Badcaps Legend
    • Jul 2010
    • 1095
    #1

    Dell SE198WFP Inverter Mosfets

    The fault with this is that the 'N' Channel Mosfet in the Inverter Output circuit has gone short.My problem is that the other Output one is a 'P' Channel,and I do not know which is which ? this refers to Q205 and Q208 shown .Any help would be appreciated.
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Dell SE198WFP Inverter Mosfets

      Can I see the back side of the board so I can see how they are hooked up? More likely to be half bridge setup which mean the Source of the P-CH will be connected to the B+ and the Drain pin will be connected to the Drain pin of the N-CH, the N-CH's source will be connected to the Ground directly or through a small value resistor for currecnt sensing feedback.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • Rtech
          Badcaps Legend
          • Jul 2010
          • 1095
          #3
          Re: Dell SE198WFP Inverter Mosfets

          As requested :-
          Attached Files

            Comment

            Previous template Next

            Related Topics

            Collapse
            • 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
            • 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
            • 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
            • SMDFlea
              Dell Thunderbolt Firmware
              by SMDFlea
              Dell thunderbolt firmware, extracted from dell firmware update exe. Padded to 1MB.

              Some models have a choice of 2 different firmwares, it depends on the dell SKU.
              The SKU is in brackets (****)

              EDIT: NVM65...
              01-26-2025, 06:22 AM
            • F R 2568
              Dell Latitude 5420 does not start (no post) need help to find the reason why
              by F R 2568
              Hello all,

              this is my first post, so if I make mistakes please do not hesitate to point them out, thank you in advance.

              I got a Dell Latitude 5420 (Service Tag: 7RFM6D3, Motherboard: GDF40 LA-491P Rev.: 2.0 (A01)) which does not start and I want to repair it. These are the symptoms:

              If the laptop is only connected to the AC adapter (battery removed):

              When I press the power button, the keyboard backlight and the display backlight are turning on. Caps key light is lightning, but key does not respond to pressing it.

              The power/battery...
              01-08-2025, 05:45 AM
            • Loading...
            • No more items.
            Working...