Acer4752 Power On Issue

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  • dspok
    Badcaps Veteran
    • Jan 2014
    • 553
    • Nepal
    #1

    Acer4752 Power On Issue

    Hello,

    I have a issue with this Acer 4752 laptop and in many other model I faced similar issue.

    Machine voltages OK, charging OK, 3/5V Ok but won't turn on. If I remove RTC Battery machine turns on itself and display comes out.

    No short or leakage in RTC section, SIO changed, BIOS reprogrammed, Processor changed.

    Is PCH faulty? or something I'm missing please let me know.

    Diagram here.. https://www.badcaps.net/forum/attach...5&d=1392865123
    Tags: None
    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3575
      • slovakia
      #2
      Re: Acer4752 Power On Issue

      did u get all rsmrst , pwrok and pwrbtn signals ?

        Comment

        • mcplslg123
          Badcaps Legend
          • Jun 2015
          • 7262
          • india
          #3
          Re: Acer4752 Power On Issue

          I'm facing same issue with HP15 La-A994p mb. Everything seems to be ok as per schematics. Mb works fine with cmos battery for 10-15 days and then switches and instant off, without any display. Unplug cmos battery again starts working with display. Repeats same issue after 10-15 days. Frustated

            Comment

            • bachir2004
              Badcaps Veteran
              • Feb 2015
              • 437
              • maroc
              #4
              Re: Acer4752 Power On Issue

              Originally posted by dspok
              hello,

              i have a issue with this acer 4752 laptop and in many other model i faced similar issue.

              Machine voltages ok, charging ok, 3/5v ok but won't turn on. If i remove rtc battery machine turns on itself and display comes out.

              No short or leakage in rtc section, sio changed, bios reprogrammed, processor changed.

              Is pch faulty? Or something i'm missing please let me know.

              Diagram here.. https://www.badcaps.net/forum/attach...5&d=1392865123
              last time i had this problem,i changed the crystal near pch.i do not remmember which model.but i could switch the mobo on by power button with no display but would not turn off untill unplugging charger.

                Comment

                • dspok
                  Badcaps Veteran
                  • Jan 2014
                  • 553
                  • Nepal
                  #5
                  Re: Acer4752 Power On Issue

                  @ktmmotocross
                  Yes all rsmrst , pwrok and pwrbtn are ok. I found Q1901 pin 2 and 3 = 3.3v but no voltage at pin 5 and 6. R1916 and R1909 are ok.

                  Laptop still turns on without RTC battery, but doesn't turn off.

                    Comment

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