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Acer Travelmate P246 No Power

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    Acer Travelmate P246 No Power

    Hello Everyone

    I receive an Acer Laptop that is power responds but up to 0.02A current draw,
    Here are the power sequence I followed :

    1. VIN ok
    2. 3V_LDO AND 5V VL ok
    3. +3VPCU AND +5VPCU ok
    4. +15V ok
    5. DPWROK
    6. NBSWON# ok
    7. S5_ON ok
    8. +1.05V_S5 ok
    9. +3V_S5 ok
    10.+5V_S5 ok
    11. HWPG_1.05V missing
    12. RSMRST# ok
    13. SB_ACDC
    14. DNBSWON#
    15. SUSC#
    16. SUSON
    17. +1.35V_SUS
    18. DDR_VTT_RUN
    19.SUSB#
    20. MAINON

    I am stock here in HWPG_1.05v because it is missing but the coil have 1.06v reading, I have already replaced the regulator a new but still same issue.
    I have already reflashed the SIO and Main Bios, Is ther one who can guide and help me find the culprit?
    Attached Files

    #2
    Re: Acer Travelmate P246 No Power

    check the cpu_core voltage?
    and what resistance to ground you have on the cpu related coils?

    also it would be more helpful if you attache the schematics ..

    Comment


      #3
      Re: Acer Travelmate P246 No Power

      Originally posted by Weelcup View Post
      also it would be more helpful if you attache the schematics ..
      Here:
      https://www.badcaps.net/forum/showth...852#post868852

      Comment


        #4
        Re: Acer Travelmate P246 No Power

        KBC IT8587pin 84 test the voltage and the resestence
        test voltage of
        HWPG_1.5v
        HWPG_VDD
        SYS_HWPG

        Comment


          #5
          Re: Acer Travelmate P246 No Power

          I will jump to step 14 and so. Since you have RSMRST# was okay.
          SB_ACDC tied with acpresent so maybe after DNBSWON# get responding.

          Comment


            #6
            Re: Acer Travelmate P246 No Power

            ok i will try to test those points because i dont have any idea to go next, thanks. will update after done tsting the testpoints

            Comment


              #7
              Re: Acer Travelmate P246 No Power

              HWPG - 0V
              HWPG_1.5V - 0v
              HWPG_VDD - 0v
              SYS_HWPG - 3v
              HWPG_1.05v - 0.123v Wont go high because of the absence ug 3v which is the source ug the pull high resistor. 3v not present because of the absence ug Mainon Signal from the SIO

              Comment


                #8
                Re: Acer Travelmate P246 No Power

                According to Quanta motherboard power sequence after RSMRST 3.3V SIO communicate with PCH to turn on DNBSWON 3.3V then only S3 S4 (SUSB SUSC ) PCH release test power on PCH 3.3V in top caps , bad SIO or PCH give a little heat to PCH discharge all pins of SIO to GND, if someone else can help out !

                Comment


                  #9
                  Re: Acer Travelmate P246 No Power

                  Also RTC circuitry must be checked, RTC_RST and SRTC_RST have not low resistance, Quanta BY3, ZQ0 and HK8 few of them fallen on that circuits.

                  Comment


                    #10
                    Re: Acer Travelmate P246 No Power

                    ok thank you for the tips, sad to say the owner get the unit so I return it. Better luck next time to me, almost 1 week of struggling

                    Comment


                      #11
                      Re: Acer Travelmate P246 No Power

                      automatically turned off mother board after trigger the power button

                      Comment

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