Sony svf15 tps51427 overheating!

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  • Erat
    Member
    • Mar 2015
    • 13
    • Greece

    #1

    Sony svf15 tps51427 overheating!

    Hello to everyone! I am not a pro at electronics but i have fixed many motherboards except this one that i am fighting to find out whats going one for one week now! My problem is that tps 51427 is overheating and measuring i find out that 6237ldo5 output is 3.23v and not 5v so following this i discover that pu15 G923-330 when i desolder it the 6237ldo5 is 5.2v! So checked datasheet of tps51427 and i notice that ldo is 100mA out and after pu15 it drains 200mA and i think that this is what is causing tps51427 to overheat!Now i try to put 5 volt manually there and wallah motherboard is working booting normally and tps stop overheating! Now i remove the external voltage and Vin of pu15 is 5.23V and out 3.3V and laptop continue to working for 5 min then dies again with same syptoms! What can this be?
    Attached Files
  • Life Goes On
    Badcaps Veteran
    • May 2014
    • 264
    • Curacao

    #2
    Re: Sony svf15 tps51427 overheating!

    You can better post the schematic here for a better view.
    The Night Drop Down, I Will Keep Try Until..., You Never know.
    Dushi Kòrsou, Nos Tei.

    Comment

    • Erat
      Member
      • Mar 2015
      • 13
      • Greece

      #3
      Re: Sony svf15 tps51427 overheating!

      I just uploaded the schematic!Please need help!
      Attached Files

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      • Erat
        Member
        • Mar 2015
        • 13
        • Greece

        #4
        Re: Sony svf15 tps51427 overheating!

        Fixed it finally! Kbc controller it was and some smd mosfets!

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk

          #5
          Re: Sony svf15 tps51427 overheating!

          Originally posted by Erat
          smd mosfets!
          ?!?!?!!??!

          can you be more specific??
          or ST fets? SOT23
          Last edited by dj_ricoh; 05-16-2015, 08:26 AM.
          Just cook it! It's already broken.

          Comment

          • Erat
            Member
            • Mar 2015
            • 13
            • Greece

            #6
            Re: Sony svf15 tps51427 overheating!

            It was Q20 shorted and 51427 burned that cause the kbc controller to overvoltage and burn some part of it! With external 3.3volt i was able to operate the motherboard but after changing kbc worked like a charm!

            Comment

            • atsio
              Badcaps Veteran
              • Oct 2013
              • 819
              • Greece

              #7
              Re: Sony svf15 tps51427 overheating!

              Q20 and KBC ..... what the f..ck.

              Comment

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