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TSP 51125 fail to give 5.0voltage

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    TSP 51125 fail to give 5.0voltage

    Mother board :
    6050A2170401-MB-A03
    Error :
    Dead no power LED ,no HHD spinning or any POST
    Troubleshooted
    Charger IC (BQ24721C)is ok giving out 10.9v with battery and 14.6Vwith
    Adaptor charger
    Obsevation:
    I obseved 10.9 along TSP5117 but Missing 5V to power TSP 5117,ADP 3208 and other 5v

    Please give me hand on this , I need to power on this Machine
    Thanks in advance
    Last edited by Zengo; 04-19-2012, 12:54 PM. Reason: Clarification

    #2
    Re: TSP 51125 fail to give 5.0voltage

    What laptop is it out of - please put that in the thread title
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment


      #3
      Re: TSP 51125 fail to give 5.0voltage

      Toshiba Satellite L300

      Comment


        #4
        Re: TSP 51125 fail to give 5.0voltage

        here is a link to the schematic
        http://lqv77.com/download/652/
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment


          #5
          Re: TSP 51125 fail to give 5.0voltage

          thanks Selldoor
          I got the LINK
          What i have on TPS 51125 is only 3.3 voltage which is good
          but on pin 20 and pin21 0Voltage instead of 5 voltage
          where is the problem?

          Comment


            #6
            Re: TSP 51125 fail to give 5.0voltage

            thanks for all , now i will be going out till tomorrow

            Comment


              #7
              Re: TSP 51125 fail to give 5.0voltage

              i have the same situation with Toshiba A300. no 5v on TSP51125, only 3.3v
              i replaced TSP51125 and still not working
              where is the problem?
              thanks.

              Comment


                #8
                Re: TSP 51125 fail to give 5.0voltage

                If you'd like me to take any readings from a working L300 GL960 board, feel free to ask. Just as long as they're not risky (i.e individual pins on QFN chips that aren't connected to nearby components)
                Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

                Comment


                  #9
                  Re: TSP 51125 fail to give 5.0voltage

                  i'm having the same situation here, i have 3.3v but no 5v. TPS51125, satelite c665. Still working on it, if i solve i'll let you know. But if you allready solved the problem please answer the post..

                  Comment


                    #10
                    Re: TSP 51125 fail to give 5.0voltage

                    I checked datasheet of tps51125. To enable outputs, pin 1 and 6 should be connected to ground by 130k resistors. In my case, EC is driving these pins through a swithcing circuit. I disconnected a transistor, it is working now. But that means i have a faulty EC.

                    Comment


                      #11
                      Re: TSP 51125 fail to give 5.0voltage

                      What is EC ? how to handle ec

                      Comment


                        #12
                        Re: TSP 51125 fail to give 5.0voltage

                        EC is the embedded controller
                        "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                        -David VanHorn

                        Comment


                          #13
                          Re: TSP 51125 fail to give 5.0voltage

                          Same issue with toshiba A300, I don't get the 5V at L22.
                          Replaced U27 with no luck.
                          System powers on and off soon after. Already replaced nec tokin capacitor.
                          If I disconnect Q34 I get the 5V but it powers off again.
                          Also I replaced U29 kbc but same issue.
                          Schematic provided.
                          Any help appreciated.

                          Comment


                            #14
                            Re: TSP 51125 fail to give 5.0voltage

                            Checked for short on that rail?
                            "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                            -David VanHorn

                            Comment


                              #15
                              Re: TSP 51125 fail to give 5.0voltage

                              I get higher than 15kohm at that rail - seems normal

                              Comment


                                #16
                                Re: TSP 51125 fail to give 5.0voltage

                                some times ic fault and some time 5v line having shortg in any resistncs

                                Comment

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