msi cr400 - no display

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  • crazypepe
    Member
    • Oct 2012
    • 34
    • Philippines

    #1

    msi cr400 - no display

    hey guys

    have a msi cr400 with no display
    already replaced proadlizer capacitor with 4 x 330uf tantalum
    but still no display
    havent done a reflow yet but checked capacitors under the nvidia chip it shows 7 ohms? is that considered a short circuit?

    also dont know if its related or unusual but when plugging in the charger, the led in the charging battery indicator flashes once and then once again after removing the charger

    thanks in advance guys
  • crazypepe
    Member
    • Oct 2012
    • 34
    • Philippines

    #2
    Re: msi cr400 - no display

    attached schematics
    Attached Files

    Comment

    • lezsimply
      The Wanderer
      • Jan 2013
      • 645
      • Philippines

      #3
      Re: msi cr400 - no display

      what's your vcore voltage? you can check fddizon's thread, it might be same problem with your's.

      Comment

      • lezsimply
        The Wanderer
        • Jan 2013
        • 645
        • Philippines

        #4
        Re: msi cr400 - no display

        I forgot its not even powering, sorry

        Comment

        • atsio
          Badcaps Veteran
          • Oct 2013
          • 819
          • Greece

          #5
          Re: msi cr400 - no display

          What is the resistance of your meter probes, i.e. if you touch them for test?
          What is the resistance under the nvidia if you remove the processor?

          Comment

          • fddizon
            Badcaps Veteran
            • Sep 2011
            • 555
            • Philippines

            #6
            Re: msi cr400 - no display

            pepe,

            before putting those caps, whats the status of laptop when powered on?

            given:
            -no display
            -
            -

            Comment

            • crazypepe
              Member
              • Oct 2012
              • 34
              • Philippines

              #7
              Re: msi cr400 - no display

              @fddizon
              well thats about it, there is no display
              no beeps no blinking lights no change on screen

              @atsio
              meter shows there is 7 ohms under nvdia chip

              @lezsimply
              vcore is 0.01

              already removed the nec/tokin type capacitor and replaced it with 4 x 330uf tantalum capacitors but still no display

              thanks for the replies guys

              Comment

              • atsio
                Badcaps Veteran
                • Oct 2013
                • 819
                • Greece

                #8
                Re: msi cr400 - no display

                Originally posted by crazypepe
                meter shows there is 7 ohms under nvdia chip
                I asked you what is the resistance of your probes if you touch them for testing (Asking to see if meter shows 0 Ohm).

                7 Ohms is without the processor plugged in?

                What is the resistance on PL3, PL4, PL5, PL6, PL7, PL8, PL9, PIN 1 & 2 OF PQ36 with processor and memory removed.

                Comment

                • crazypepe
                  Member
                  • Oct 2012
                  • 34
                  • Philippines

                  #9
                  Re: msi cr400 - no display

                  Originally posted by atsio
                  I asked you what is the resistance of your probes if you touch them for testing (Asking to see if meter shows 0 Ohm).

                  7 Ohms is without the processor plugged in?

                  What is the resistance on PL3, PL4, PL5, PL6, PL7, PL8, PL9, PIN 1 & 2 OF PQ36 with processor and memory removed.


                  probes touching is 0 ohms

                  yes, 7 ohms is without processor plugged

                  resistancce of
                  pl3=303
                  pl4=821
                  pl5=0
                  pl6=850
                  pl7=223
                  pl8=1013

                  pl9,pq38 and pu11 are empty
                  but pins are there see attached photo
                  Attached Files

                  Comment

                  • fddizon
                    Badcaps Veteran
                    • Sep 2011
                    • 555
                    • Philippines

                    #10
                    Re: msi cr400 - no display

                    pepe,

                    page 28.
                    remove pl5 coil and determine which side is shorted to ground.
                    if on the right side, check components going in that direction
                    if on left, you know what to do

                    Comment

                    • crazypepe
                      Member
                      • Oct 2012
                      • 34
                      • Philippines

                      #11
                      Re: msi cr400 - no display

                      Originally posted by fddizon
                      pepe,

                      page 28.
                      remove pl5 coil and determine which side is shorted to ground.
                      if on the right side, check components going in that direction
                      if on left, you know what to do
                      thanks for the reply fddizon

                      but already checked all components out of circuit towards the direction of the short, i ended up below the vga chip mcp79mvl-b3
                      its like the line of +mcp79_core is shorted?..

                      thought it was normal because in your other post you said that the vga is short and still the 4 x 330uf capacitors worked right?

                      again thanks for your time

                      Comment

                      • fddizon
                        Badcaps Veteran
                        • Sep 2011
                        • 555
                        • Philippines

                        #12
                        Re: msi cr400 - no display

                        my apology to that. i use diode tester with sound, when it measures low resistance value, it beeps.
                        forgot to post reading of resistance.

                        your reading is 0 which means that it is shorted as if you short your two probes.
                        Last edited by fddizon; 03-26-2014, 01:50 AM.

                        Comment

                        • atsio
                          Badcaps Veteran
                          • Oct 2013
                          • 819
                          • Greece

                          #13
                          Re: msi cr400 - no display

                          To be 100% certain you have to remove and PU8, r257, r258 but my experience tells me that the problem is with the Media and Communication Processor (MCP), your conclusion.
                          You have to unsolder it and check of course first, if the short is gone on the board and secondly if MPC is functional.

                          Comment

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