Lenovo P50 dead with burned motherboard

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Andreasbest
    Badcaps Legend
    • Aug 2014
    • 1197
    • Hellas ( Greece )

    #1

    Lenovo P50 dead with burned motherboard

    Hello.
    I received a P50 in very good shape that is dead and smelled burned board when on power supply.
    I strip it and found a heavily burned area, there should be some cap but now are smoke.
    Not sure where the one copper trace stops and starts the next, they seem mixed probably due to heat, this is my main problem as i'm not sure where should i solder what, so any help is appreciated.
    Schematics & boardview here

    Pictures os the affected area attached below.
    Not sure if it can be saved but i'll give it a try.
    Thank you in advance!
    Attached Files

    if you find these attachements useful please consider making a small donation to the site

  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    First check resistance to GND on both pads of the burnt area.

    Comment

    • Andreasbest
      Badcaps Legend
      • Aug 2014
      • 1197
      • Hellas ( Greece )

      #3
      Well this is my main problem. I don't figure where the one pad ends and starts the other, they seem like one.
      Anyway i took some measurements, the red area is grounded, the blue area is 170Ω
      Attached Files

      if you find these attachements useful please consider making a small donation to the site

      Comment

      • Andreasbest
        Badcaps Legend
        • Aug 2014
        • 1197
        • Hellas ( Greece )

        #4
        A user was kind enough to sent me picture of the affected area to understand how the traces should be.

        Seems like the blue and hald red are the same rrqce and red is divided in the middle.
        Attached Files

        if you find these attachements useful please consider making a small donation to the site

        Comment

        • Andreasbest
          Badcaps Legend
          • Aug 2014
          • 1197
          • Hellas ( Greece )

          #5
          Bump

          Comment

          • rogfanther
            Badcaps Veteran
            • Jul 2006
            • 458
            • Brazil

            #6
            You received the picture for the area, showing where things are connected. Why the need to uselessly bump the thread ? Can´t you solve it with the picture provided ? In that case, post clear images of what is your problem.

            Comment

            • Andreasbest
              Badcaps Legend
              • Aug 2014
              • 1197
              • Hellas ( Greece )

              #7
              I'm not sure where to digide the bottom trace (the red marked area on picture #1) as it seems like one and after divide where to inject voltage to trace the other short.

              Comment

              Related Topics

              Collapse

              • andrhouseolly
                Lenovo X240 - motherboard replacement for X250, no image.
                by andrhouseolly
                Friends. I beg you to help me in this situation.
                Lenovo X240 with a video problem. Native Intel drivers are not installed,
                after installation, a black screen. It works with the standard Microsoft driver.
                Understanding that there are problems with the video core,
                I ordered a motherboard from Lenovo X250.
                The laptop turns on, starts up, there is no image on the internal display.
                The image is output to the external monitor.
                I ordered another motherboard from Lenovo X250.
                The laptop turns on, starts up, there is no image on the internal display.
                ...
                07-12-2024, 03:02 PM
              • coasterghost
                Lenovo T14 Gen 2 Type 20XK Model 20XK0069US Odd Charging Issues
                by coasterghost
                For Badcaps Readers, Please note that I am hopefully going to present this same message to Lenovo to see if they have any insight to the matter as well and figured to share the entirety here for clarification. The System is out of warranty as it is but does have the option to have it extended.

                Model Information: T14 Gen 2 (Type 20XK, 20XL) Laptop (ThinkPad) - Type 20XK - Model 20XK0069US
                Board: T14 Gen 2 (Type 20XK, 20XL) - Type 20XK.

                System Hardware:
                Processor: AMD Ryzen 7 PRO 5850U
                Memory: 1x 16GB DDR4 3200 (Soldered on Board); 1x Crucial 32GB DDR4...
                09-08-2025, 10:46 PM
              • rddube
                Need help interpreting schematic of Lenovo B470 motherboard
                by rddube
                Hello everyone,

                OK, so here is my issue.

                This Lenovo B470 motherboard I am troubleshooting died and I identified it is the discrete Nvidia graphics chip that has lost it's ways!

                So I removed it and now I am trying to change this motherboard to use UMA graphics, but I am having an issue interpreting the attached diagram. I have a 10K resistor in at the R2013 position and another one at the R2012. R2010 and R2011 are empty.

                The motherboard starts, the fan spins but no display. It turns off by itself. I restart it and it does start but stays on...
                08-12-2024, 02:01 PM
              • jamesp
                Lenovo laptop dead motherboard GS752 NM-C781rev. 1.0 2019-11-25 inscribed at the pcb,
                by jamesp
                I have a dead laptop with mainboard model GS452/552/752 nm-c781 rev 1.0, i have initiated troubleshooting with the use of digital multimeter. checked voltage signals up to PM_SLP_S3#, found out that before PM_SLP_S3# signal , a PBTN_OUT#_R signal has 3.2 volt state and after pressing power on, PBTN_OUT#, It drops to logic level zero for around 12 secs and then back again to 3.2v for 6 secs. it will loop like that until you pulled out the adapter power. during loop the PM_SLP_S3 and S4 SIGNAL has no output. (0 volt ) may i ask for help to anyone with this kind of board and same kind of problem....
                03-18-2024, 08:17 AM
              • Giggle2562
                Lenovo V15-IIL motherboard swap (in V15-IKB) shuts down when internal display is connected
                by Giggle2562
                Hello everyone,

                I have a Lenovo V15-IKB that had a damaged motherboard. I replaced it with a motherboard from a Lenovo V15-IIL.

                The board powers on, but it shuts down after about 10-15 seconds. This only happens when the internal display (LCD panel) is connected.

                Here's what I've tried so far:
                • When the internal display is disconnected, the laptop works perfectly fine via HDMI.
                • The laptop shows an image on the internal display for a few seconds before it shuts down.
                • I tried swapping the LCD panel with a known good one.
                • I tried swapping the LCD cable
                ...
                11-06-2025, 12:36 PM
              • Loading...
              • No more items.
              Working...