Sony PCG-81312M no power.

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  • rippergr
    Badcaps Veteran
    • May 2014
    • 345
    • Ελλάδα
    #1

    Sony PCG-81312M no power.

    Hello all,
    I have a sony vaio pcg-81312M
    product name: vpcf22m1e
    Motherboard type : v081_MP_MB
    Rev 1.1
    MBX-243
    My problem is that the laptop doesnt power on at all. I couldn't find schematics except from a thread in forum
    HTML Code:
    https://www.badcaps.net/forum/showthread.php?p=482456
    which is for MBX-215.
    I measure dc from power adaptor which is ok and in PF1 but after PF1 I don't know how to continue because the schamtics are no exactly the same.
    I suppose it continues from the other side (I will attach closeup picture ) which all mosfet PQ1 and PQ2 have no voltage (I measure them with diode and they are ok) and all the components near them dont have voltage at all.
    Can someone provide me some schematics or has any idea what to check.
    Attached Files
    Tags: None
    • rippergr
      Badcaps Veteran
      • May 2014
      • 345
      • Ελλάδα
      #2
      Re: Sony PCG-81312M no power.

      Somehow the power restored to mosfets and in PU3 (or PU1 it doesn't show very well) BQ24753A and I have the voltages in the attached image.
      The laptop still doesnt power on.
      Attached Files

        Comment

        • Life Goes On
          Badcaps Veteran
          • May 2014
          • 264
          • Curacao
          #3
          Re: Sony PCG-81312M no power.

          It is difficult to work without schematic, but have you measure the current on the BIOS chip, otherwise you can reflash the BIOS chip and see what that does.
          The Night Drop Down, I Will Keep Try Until..., You Never know.
          Dushi Kòrsou, Nos Tei.

            Comment

            • ktmmotocross
              Boardkiller
              • Feb 2014
              • 3553
              • slovakia
              #4
              Re: Sony PCG-81312M no power.

              start from hete
              https://cdn.badcaps-static.com/pdfs/...791996af74.pdf

                Comment

                • rippergr
                  Badcaps Veteran
                  • May 2014
                  • 345
                  • Ελλάδα
                  #5
                  Re: Sony PCG-81312M no power.

                  It is difficult to work without schematic, but have you measure the current on the BIOS chip, otherwise you can reflash the BIOS chip and see what that does.
                  If the problem was in bios I think that the laptop would start but it wont POST.

                  start from hete
                  https://cdn.badcaps-static.com/pdfs/...791996af74.pdf
                  I already measure this chip and I have the results in my last post.

                  The voltage to the power controller I think it's ok . What can I check after that ? northbridge chip ? and what voltages

                    Comment

                    • rippergr
                      Badcaps Veteran
                      • May 2014
                      • 345
                      • Ελλάδα
                      #6
                      Re: Sony PCG-81312M no power.

                      Can somebody help me with this?

                        Comment

                        • gokhankelebek
                          Member
                          • Dec 2015
                          • 10
                          • türkiye
                          #7
                          Re: Sony PCG-81312M no power.

                          mbx-215 m931 bios pls!!!!

                            Comment

                            • jhonecaj
                              New Member
                              • Dec 2020
                              • 4
                              • brazil
                              #8
                              Re: Sony PCG-81312M no power.

                              please Schematic for sony pcg-81312L mbx-243 v081_mp_mb

                                Comment

                                • jhonecaj
                                  New Member
                                  • Dec 2020
                                  • 4
                                  • brazil
                                  #9
                                  Re: Sony PCG-81312M no power.

                                  Originally posted by gokhankelebek
                                  mbx-215 m931 bios pls!!!!

                                  https://www.badcaps.net/forum/showthread.php?t=65381

                                    Comment

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