DELL N5010 shorted area

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • sparker1
    Badcaps Veteran
    • Sep 2011
    • 343
    • Australia

    #1

    DELL N5010 shorted area

    Hello, I have a Dell N5010 that has a shorted area on both sides of the board in the same (reciprocal) area. The section in the schematic belongs to the battery charger management. All the components in the two areas are shorted. I am not sure what is the best way to proceed. I was going to remove components one by one to see if the short disappears. I have already removed the buck controller (PU4501) as you can see in the picture but the short remains. I thought the next suspects would be the mosfets (PU4504/5/3) and my plan was to remove them one by one and test for the short at each removal. Is this what you guys would do? Any suggestions would be appreciated. I don't have an oscilloscope and wouldn't know how to use one anyway. I was going to bin the board and buy a new one but the costs are too much.
    Attached Files
  • khaahk
    Badcaps Veteran
    • Dec 2013
    • 759
    • Estonia

    #2
    Re: DELL N5010 shorted area

    Short can be between 2 points, it is meaningless to say that area has short. Show points. Do not apply power without buck controller on board, it may damage the board...

    Comment

    • sparker1
      Badcaps Veteran
      • Sep 2011
      • 343
      • Australia

      #3
      Re: DELL N5010 shorted area

      But every component within the area is shorted to ground. They all get scorching hot.
      Last edited by sparker1; 01-29-2015, 07:47 PM.

      Comment

      • khaahk
        Badcaps Veteran
        • Dec 2013
        • 759
        • Estonia

        #4
        Re: DELL N5010 shorted area

        So you got 0 ohms to gnd from all 3 points?
        Attached Files

        Comment

        • sparker1
          Badcaps Veteran
          • Sep 2011
          • 343
          • Australia

          #5
          Re: DELL N5010 shorted area

          Originally posted by khaahk
          So you got 0 ohms to gnd from all 3 points?
          Well, nearly 0.
          At Point 1 =2 Caps (both read the same) = 0.3 ohms and 7.6 ohms at other end
          At Point 2 =Cap = 0.3 and 2.9 ohms
          At Point 3 =Mosfet:
          pins1, 2 and 3 =7.6 ohms
          pin 4=134.9 ohms
          pins 5,6,7,8 =2.8 ohms

          My DMM is set at the 200 ohm scale and shows 0.4 ohms when the probes are touched together.

          Continuity meter gives a beep for everything in the area to ground. I was thinking there is a component within the circle(s) that is causing the entire circuit to show as shorted. My first guess was the buck converter but its removal didn't help. Appreciate your interest Khaahk. A palindrome!
          Last edited by sparker1; 01-30-2015, 02:04 AM.

          Comment

          • khaahk
            Badcaps Veteran
            • Dec 2013
            • 759
            • Estonia

            #6
            Re: DELL N5010 shorted area

            Start removing the mosfets, starting with 4505, then 4504 and see how resistances change. I reapeat my suggestion: do not apply adapter power without buck controller, the situation may become worse. (if it hasn't already).

            Comment

            • sparker1
              Badcaps Veteran
              • Sep 2011
              • 343
              • Australia

              #7
              Re: DELL N5010 shorted area

              The mosfets were my next choice too. I won't apply power without the buck converter.

              Comment

              • sparker1
                Badcaps Veteran
                • Sep 2011
                • 343
                • Australia

                #8
                Re: DELL N5010 shorted area

                OK. I removed both mosfets and the short seems to have gone. Here are the measurements with the mosfets removed:

                Point1 (2 caps) = 0.3 and infinity
                Point 2 (cap) = 0.3 and infinity
                Point 4 (mosfet) = pin4 is 0.207Mohm all other pins infinity.

                I'll replace those two mosfets and the buck converter and see what happens.

                Comment

                • sparker1
                  Badcaps Veteran
                  • Sep 2011
                  • 343
                  • Australia

                  #9
                  Re: DELL N5010 shorted area

                  No luck. The short circuit has gone and nothing gets hot but no sign of life. Something else is broken. There are no lights and no fan spin. Could it be a bios problem now?

                  Comment

                  • sparker1
                    Badcaps Veteran
                    • Sep 2011
                    • 343
                    • Australia

                    #10
                    Re: DELL N5010 shorted area

                    Reprogrammed bios and no change-dead. I've spent enough time on this. I'll fork out for a working board.

                    Comment

                    • khaahk
                      Badcaps Veteran
                      • Dec 2013
                      • 759
                      • Estonia

                      #11
                      Re: DELL N5010 shorted area

                      No voltage measurements? Giving up a little too easy...
                      PU4502 voltages on all pins?
                      +3.3V_ALW_2 present?
                      +3.3V_ALW present?
                      +5V_ALW present?
                      Pin 2 and 22 voltage on PU4501?

                      Comment

                      • dj_ricoh
                        Badcaps Legend
                        • Jan 2013
                        • 2073
                        • uk

                        #12
                        Re: DELL N5010 shorted area

                        Originally posted by khaahk
                        No voltage measurements? Giving up a little too easy...
                        PU4502 voltages on all pins?
                        +3.3V_ALW_2 present?
                        +3.3V_ALW present?
                        +5V_ALW present?
                        Pin 2 and 22 voltage on PU4501?
                        PHASE 2 3.3v_alw and PHASE 1 5V_Pwr its the input right?

                        VREG 3 and 5 its the output on PU4601

                        P.S. Don`t forget ACOK on pin 13 ; That could be a give away if its not ok there
                        Last edited by dj_ricoh; 01-31-2015, 03:05 AM.
                        Just cook it! It's already broken.

                        Comment

                        • razu
                          Badcaps Veteran
                          • Jan 2015
                          • 218
                          • Bangladesh

                          #13
                          Re: DELL N5010 shorted area

                          Open the battery charging Ic BQ 24745 Pu 4501, and then u measure short area If short is gone the Ic is faulty If not gone the short is probably a PF (capacitor) Beneth the chips
                          Have a good luck!!!!!!!!!!! Friend

                          Comment

                          • smali
                            Badcaps Veteran
                            • Sep 2014
                            • 287
                            • Pakistan

                            #14
                            Re: DELL N5010 shorted area

                            it is very difficult to point out the short component on main power line because a lot of component are mount on that line and every will be show short so a simple way which i used to inject external power low voltage with high ampere so the short component will be burn or heat up so it is simple way which i rectify many laptop.

                            Comment

                            • SteveNielsen
                              Retired Tech
                              • Jun 2012
                              • 2327
                              • USA

                              #15
                              Re: DELL N5010 shorted area

                              Originally posted by sparker1
                              OK. I removed both mosfets and the short seems to have gone. Here are the measurements with the mosfets removed:

                              Point1 (2 caps) = 0.3 and infinity
                              Point 2 (cap) = 0.3 and infinity
                              Point 4 (mosfet) = pin4 is 0.207Mohm all other pins infinity.

                              I'll replace those two mosfets and the buck converter and see what happens.
                              By replace do you mean with new parts or putting back the originals? Did you test the MOSFETs while you had them out of circuit?

                              Comment

                              • sparker1
                                Badcaps Veteran
                                • Sep 2011
                                • 343
                                • Australia

                                #16
                                Re: DELL N5010 shorted area

                                The buck controller was replaced with a new one. The old mosfets were shorted drain to source and were replaced with a stock I had - some were new and some off scrap boards so I'm not sure how old they were but they tested OK. I did some voltage measurement on PU4601 (buck controller) voltages:
                                Pin 23 (pwgood)=2.59v
                                Pin 17 (5v)=3.27v
                                Pin 8 (3v)=0.0v
                                I don't know what to make of these readings.

                                Comment

                                • dj_ricoh
                                  Badcaps Legend
                                  • Jan 2013
                                  • 2073
                                  • uk

                                  #17
                                  Re: DELL N5010 shorted area

                                  Originally posted by sparker1
                                  The buck controller was replaced with a new one. The old mosfets were shorted drain to source and were replaced with a stock I had - some were new and some off scrap boards so I'm not sure how old they were but they tested OK. I did some voltage measurement on PU4601 (buck controller) voltages:
                                  Pin 23 (pwgood)=2.59v
                                  Pin 17 (5v)=3.27v
                                  Pin 8 (3v)=0.0v
                                  I don't know what to make of these readings.
                                  read the rest .
                                  take every pin!
                                  Just cook it! It's already broken.

                                  Comment

                                  Related Topics

                                  Collapse

                                  • reessi
                                    Acer Alienware Nitro 5 (GH51G LA-L181P Rev: 1C) & Dell Alienware M15 (GDP50 LA-k452P Rev:1) - Both Shorted PCH (SRKMA)!
                                    by reessi
                                    Hello:

                                    I have both these laptops that appeared to have the same fault so I thought I would have a go at replacing the PCH as something to learn, they both are using the same PCH.


                                    I started on the ACER:

                                    Up on connecting power no signs of life but current is consumed from the bench power supply and the PCH is hot.
                                    All the caps on the top of the PCH are showing 0 ohms and the 3.3v rail is shorted.

                                    I followed the videos from Sorin, Electronics Repair School on Youtube heating from the bottom to install. I practised on around 10 scrap...
                                    10-29-2024, 11:31 AM
                                  • OOF DIO
                                    ASUS FX505DV no power shorted at PWM controller Pin 3 VREG3 TPS51225C, need pinpointing of the short.
                                    by OOF DIO
                                    (If anyone has a functional boardview file of FX505DV/DU that would be helpful)
                                    (Had 3 problems, now just 1)

                                    I have no experience or knowledge and usage of tools to repair devices besides the entire past 12-10 days of researching, watching YouTube repair videos and troubleshooting this laptop motherboard. ChatGPT was used as a guide to ask questions.
                                    I used boardviews of mostly FX505GD-M, and some FX505DU, FX505DD. Used schematics of FX505DU.

                                    I had originally intended to replace the BQ24780s first (due to previous battery removal while benchmarking) but I...
                                    04-19-2025, 05:03 PM
                                  • 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
                                  • guizmo1967
                                    Dell Latitude 5501 LA-H181P shorted power rail
                                    by guizmo1967
                                    Hello,

                                    This is my problem:

                                    Laptop: Dell Latitude 5501
                                    Motherboard: EDC51 LA-H181P

                                    I have two power rails shorted to ground, +1.0V_PRIM and +3.3V_ALW_PCH. I removed solder on PJP302, +1.05VALWP (pad1) not shorted but +1.0V_PRIM (pad2) shorted.

                                    I also cleaned PJP38, pad1 not shorted, pad2 (+3.3V_ALW_PCH) shorted to ground.

                                    I measure the resistance of all the coils on the motherboard and they all were not shorted to ground except coil PL301 before I removed the solder on PJP302.

                                    I injected +1.05V - 2A...
                                    07-25-2023, 06:56 PM
                                  • minaedward
                                    Dell N5010 keyboard
                                    by minaedward
                                    Hi all
                                    I have a dell n5010 that shows black screen after the dell logo and freezes
                                    But when I remove the keyboard it works fine and boot the windows
                                    The keyboard is working as I can press F1 and F2 and inter the bios settings and change it
                                    But after the dell logo it causes the laptop to freeze
                                    Any ideas why ?
                                    09-29-2024, 05:24 PM
                                  • Loading...
                                  • No more items.
                                  Working...