MSI GE62VR, MS-16JB burned motherboard

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  • myth77
    Badcaps Veteran
    • Feb 2017
    • 380
    • Croatia
    #1

    MSI GE62VR, MS-16JB burned motherboard

    I received this laptop, no history and the motherboard was in short circuit on main power rail. Then i noticed that motherboard literaly burned in one part...near the capacitors PC85 and PC86...there were almost 5 mm burned part of the board
    That part and capacitors are on PWR_SRC_FBVDDQ rail...and that is main rail powering FBVDDQ mosfets. It was shorted to gnd. Then i cleaned everything, cut all that was burned and with microscope inspection couldnt find any part touching or burned. The resistence is now only 58 ohms relative to GND and that is not good for main power rail. Then i removed U30, U24, U23, PQ25,PQ23, PEC12,PEC10 and PC134 and on PWR_SRC_FBVDDQ i have resistence 58 ohms relative to GND and on all other main power rails readings are in killoohms.
    So, i checked with multimeter is there a short between PWR_SRC_FBVDDQ power rail and any other on the board but there is not...it is just showing 58 ohm resistence to ground but it seems it is not conected to any other rail on the motherboard (with above mentioned smd components removed).

    So i dont get it? maybe it is still touching somewhere something..but then i would have multimeter beep?
    Have anyone else repaired burned motherboards or/and have any other idea?

    I attached boardview.
    Attached Files
    Tags: None
    • reformatt
      Badcaps Legend
      • Feb 2020
      • 1410
      • Australia
      #2
      Re: MSI GE62VR, MS-16JB burned motherboard

      They're multi layer boards, burning can potentially create a short or leakage to a ground plane. Rule out that you don't have shorted CPU drivers and CPU itself before you start wasting your time.

        Comment

        • myth77
          Badcaps Veteran
          • Feb 2017
          • 380
          • Croatia
          #3
          Re: MSI GE62VR, MS-16JB burned motherboard

          No short on cpu, gpu, pch...i checked. I believe i probably have leakage to the ground...but i can not determine where...

            Comment

            • myth77
              Badcaps Veteran
              • Feb 2017
              • 380
              • Croatia
              #4
              Re: MSI GE62VR, MS-16JB burned motherboard

              Ok, finally i made it....I used a very small rasp (file) and gently use it on those thorn layers of burned place on motherboard...that way i removed rough cooper edges of the layers....and made them smooth. Then i checked resistence PWR_SRC_FBVDDQ to gnd and it was 800 ohm...So i knew i was doing something. Then i used rasp a little more and after.. reading was 2,7 kohm but reading on multimeter was jumping...and finally when i used rasp once more the problem was gone...Now there is no resistence between PWR_SRC_FBVDDQ and gnd at least my multimeter can not read it (with already mentioned smd components removed).
              Then i used solder mask...to fill that whole.
              I hope when i put everything back it will work.

                Comment

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