satellite l450d Water damaged

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  • gcomputers
    Badcaps Veteran
    • Apr 2013
    • 509
    • Albania

    #1

    satellite l450d Water damaged

    Hi i have this toshiba i got from a costumer that hi say is water damaged.

    I checked the board and i don t see any damage.
    PU4 have 19 v arround it but i find i problem
    Arround PU5 (page 38) on PQ19 PL5 PC57 i don t have 5V.
    another problem is PQ18 pin 1,2,3,5,6,7,8 , PQ56 , Q14 pin 1,2,3,5,6,7,8 are shorted with ground .

    So i changed PQ16, PQ19, PQ18, Q14, PU5 taked from functionaly mainboard .

    ANY IDEA PLEASE????????
    Attached Files
    Last edited by gcomputers; 06-03-2015, 01:37 PM.
  • gcomputers
    Badcaps Veteran
    • Apr 2013
    • 509
    • Albania

    #2
    Re: satellite l450d Water damaged

    Any suggestion please?

    Comment

    • dspok
      Badcaps Veteran
      • Jan 2014
      • 553
      • Nepal

      #3
      Re: satellite l450d Water damaged

      Check all the short if it is still on board.

      Comment

      • gcomputers
        Badcaps Veteran
        • Apr 2013
        • 509
        • Albania

        #4
        Re: satellite l450d Water damaged

        that shorted points are still on board

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk

          #5
          Re: satellite l450d Water damaged

          Originally posted by gcomputers
          that shorted points are still on board
          i`m charging a tablet battery today and try in this weekend.

          3.7v 3700mAH

          i will blow up a few.

          Q: freeze spray or ipa in a spray bottle?
          Just cook it! It's already broken.

          Comment

          • gcomputers
            Badcaps Veteran
            • Apr 2013
            • 509
            • Albania

            #6
            Re: satellite l450d Water damaged

            Thanks for the reply , yes i cleaned it with IPA
            today i changed PU5 again ,
            and connect 5v from external usb power to pin 7.8 of pq19 nothing happened only PU5 heats up too much. on this pin need to have 5v but no voltage.

            Comment

            • atsio
              Badcaps Veteran
              • Oct 2013
              • 819
              • Greece

              #7
              Re: satellite l450d Water damaged

              Clear the solder from PJ1 and PJ5 and check resistance from both sides

              Comment

              • gcomputers
                Badcaps Veteran
                • Apr 2013
                • 509
                • Albania

                #8
                Re: satellite l450d Water damaged

                Thanks ATSIO , cleaned PJ1 and PJ5 and the resistance on booth side is 23ohm,
                what do you think?
                With PJ1 cleaned the short goes from PQ18 , PC56 no short,
                and Q14 pin 1,2,3,5,6,7,8 are shorted with ground.
                Thanks again
                Attached Files

                Comment

                • atsio
                  Badcaps Veteran
                  • Oct 2013
                  • 819
                  • Greece

                  #9
                  Re: satellite l450d Water damaged

                  When you clean the pj's from solder you can see that they are two pad for each pj. One pad (for pj1) is from the line 3valwp and the other to line 3valw. The same for pj5 (5valw and 5valwp). Check the resistance on each pad (all four) relative to ground. Also determine which pad is which buy checking for continuity with pl4 (3valwp) and pl5 (5valwp).
                  Last edited by atsio; 06-05-2015, 06:08 AM.

                  Comment

                  • atsio
                    Badcaps Veteran
                    • Oct 2013
                    • 819
                    • Greece

                    #10
                    Re: satellite l450d Water damaged

                    Also remove q14 and check for resistance relative to ground on pins 1 and 8.

                    Comment

                    • gcomputers
                      Badcaps Veteran
                      • Apr 2013
                      • 509
                      • Albania

                      #11
                      Re: satellite l450d Water damaged

                      3valwp o ohm 3valw 10 mohm
                      5valwp o ohm 5valw 8,3 ohm

                      q14 pin 1 = 0.1ohm pin 8 = 0.1 0.2 ohm
                      also i just changed pu7
                      but i see another problem pu5 maked too hot.

                      Comment

                      • atsio
                        Badcaps Veteran
                        • Oct 2013
                        • 819
                        • Greece

                        #12
                        Re: satellite l450d Water damaged

                        You can't have 10 mohm on 3valw pad (pj1) and 0.1ohm on pins 1 and 8 of q14, check again.
                        Solder a wire on one of the pads of pr38 and use your lab supply to apply current to the board. Be careful and apply slowly current and do not exceed 0,5 amps. If the board draws current check what is getting hot.
                        Last edited by atsio; 06-05-2015, 08:40 AM.

                        Comment

                        • gcomputers
                          Badcaps Veteran
                          • Apr 2013
                          • 509
                          • Albania

                          #13
                          Re: satellite l450d Water damaged

                          sorry you are right
                          3valw o ohm 3valwp 10 mohm

                          Comment

                          • atsio
                            Badcaps Veteran
                            • Oct 2013
                            • 819
                            • Greece

                            #14
                            Re: satellite l450d Water damaged

                            3valw 0 ohm or infinite on your mutlimeter

                            Comment

                            • gcomputers
                              Badcaps Veteran
                              • Apr 2013
                              • 509
                              • Albania

                              #15
                              Re: satellite l450d Water damaged

                              case closed pu5 burned and on the pads 7.8 damaged so nothing to do.........
                              Thanks again Atsio for your time

                              Comment

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