Acer E1-571G No Power

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  • boyebaran
    Badcaps Veteran
    • Sep 2015
    • 247
    • iran

    #21
    Re: Acer E1-571G No Power

    a note:just now customer said me before this problem lop top didn't turn on without battery. but charging was normal.(i replaced PU4 for sure)

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    • boyebaran
      Badcaps Veteran
      • Sep 2015
      • 247
      • iran

      #22
      Re: Acer E1-571G No Power

      removed PJ1 and PL6 ohm gone to normal...........

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      • smali
        Badcaps Veteran
        • Sep 2014
        • 287
        • Pakistan

        #23
        Re: Acer E1-571G No Power

        the problem is not 800 ohms to ground that is normal. if you have spears in parts FETS then replace PQ16 AND PQ18 just for surety.
        the main problem is when you remove PQ21 your should have (3.3v and 5v always) must receiving on both coils.
        as i said that maybe one FET ( PQ16 and PQ18) is not working if you have spears in parts replace both FETs and check the Gates voltage and post result.
        Note...during the testing you must remove only PQ21 permanently till to the time when you receive 3.3v and 5 v on both coil.

        Originally posted by boyebaran
        a note:just now customer said me before this problem lop top didn't turn on without battery. but charging was normal.(i replaced PU4 for sure)
        This may be problem from PU2( LM393).
        Last edited by smali; 10-11-2016, 01:11 AM.

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        • boyebaran
          Badcaps Veteran
          • Sep 2015
          • 247
          • iran

          #24
          Re: Acer E1-571G No Power

          after removing pj1 ,3.3 &5 volt fixed on coil.all part installed in motherboard
          Last edited by boyebaran; 10-11-2016, 02:18 AM.

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          • boyebaran
            Badcaps Veteran
            • Sep 2015
            • 247
            • iran

            #25
            Re: Acer E1-571G No Power

            Originally posted by smali
            the problem is not 800 ohms to ground that is normal. if you have spears in parts FETS then replace PQ16 AND PQ18 just for surety.
            the main problem is when you remove PQ21 your should have (3.3v and 5v always) must receiving on both coils.
            as i said that maybe one FET ( PQ16 and PQ18) is not working if you have spears in parts replace both FETs and check the Gates voltage and post result.
            Note...during the testing you must remove only PQ21 permanently till to the time when you receive 3.3v and 5 v on both coil.


            This may be problem from PU2( LM393).
            tnx smali for your help.one part in +3VALW line have problem.PJ15,PJ14,.PU16 ,.............&pch.i am worry about PCH
            Last edited by boyebaran; 10-11-2016, 02:28 AM.

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            • smali
              Badcaps Veteran
              • Sep 2014
              • 287
              • Pakistan

              #26
              Re: Acer E1-571G No Power

              Originally posted by boyebaran
              after removing pj1 ,3.3 &5 volt fixed on coil.all part installed in motherboard
              Thats OK now change PU2 (LM393) and install PJ1 and check.

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              • boyebaran
                Badcaps Veteran
                • Sep 2015
                • 247
                • iran

                #27
                Re: Acer E1-571G No Power

                this motherboard dont have PU2.

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                • boyebaran
                  Badcaps Veteran
                  • Sep 2015
                  • 247
                  • iran

                  #28
                  Re: Acer E1-571G No Power

                  Pj11 and pj14,15 and PQ16 ,PQ18 removed no change
                  Last edited by boyebaran; 10-12-2016, 11:22 PM.

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                  • boyebaran
                    Badcaps Veteran
                    • Sep 2015
                    • 247
                    • iran

                    #29
                    Re: Acer E1-571G No Power

                    i tested Pj1 by connecting 3.3 v external and no short and hitting problem on this line.as you say may PQ16 &PQ18 is faulty (faulty under load).

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                    • boyebaran
                      Badcaps Veteran
                      • Sep 2015
                      • 247
                      • iran

                      #30
                      Re: Acer E1-571G No Power

                      replaced PQ16 and PQ18 no change.

                      Comment

                      • boyebaran
                        Badcaps Veteran
                        • Sep 2015
                        • 247
                        • iran

                        #31
                        Re: Acer E1-571G No Power

                        please help ..................

                        Comment

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