My laptop acer aspire 5720zg dead (no power and lights)

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  • povilas602
    Member
    • Jan 2014
    • 10
    • nera

    #1

    My laptop acer aspire 5720zg dead (no power and lights)

    Hey, i have laptop Acer Aspire 5720zg with no power and lights. Adapter is checked and getting power ~19V. No lights with adapter and battery. My laptop motherboard number ICL50 LA-3551P. Any help where to look first?
  • lord
    Badcaps Veteran
    • May 2011
    • 319
    • Croatia

    #2
    Re: My laptop acer aspire 5720zg dead (no power and lights)

    Check for power button voltage.

    Comment

    • povilas602
      Member
      • Jan 2014
      • 10
      • nera

      #3
      Re: My laptop acer aspire 5720zg dead (no power and lights)

      Power button voltage ~16.1 V, when I press button voltage drops to zero.
      Last edited by povilas602; 01-16-2014, 12:25 PM.

      Comment

      • robrock1
        Senior Member
        • Jul 2013
        • 129
        • Ghana

        #4
        Re: My laptop acer aspire 5720zg dead (no power and lights)

        Check 3.3v and 5v standby voltage, see if something is getting hot

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        • povilas602
          Member
          • Jan 2014
          • 10
          • nera

          #5
          Re: My laptop acer aspire 5720zg dead (no power and lights)

          I mark two place where getting hot. I don't have motherboard scheme, then I can't check 3V and 5V. Can you give the address or show on the motherboard where I need to check 3V and 5V.
          Attached Files

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          • lezsimply
            The Wanderer
            • Jan 2013
            • 645
            • Philippines

            #6
            Re: My laptop acer aspire 5720zg dead (no power and lights)

            Check PL3 for 3.3v_alw and PL4 for 5v_alw, voltages must be present.

            Look for PU3 (MAX8744E) thats your 5v and 3.3v regulator IC. Schem added. hope this helps...
            Attached Files

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            • povilas602
              Member
              • Jan 2014
              • 10
              • nera

              #7
              Re: My laptop acer aspire 5720zg dead (no power and lights)

              PL3 0.01 and PL4 0.07V, but for PU3 i don't understand what pin I must check for 5V and 3V...

              Comment

              • lord
                Badcaps Veteran
                • May 2011
                • 319
                • Croatia

                #8
                Re: My laptop acer aspire 5720zg dead (no power and lights)

                Do you have voltage on pin 21 of PU3?

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                • povilas602
                  Member
                  • Jan 2014
                  • 10
                  • nera

                  #9
                  Re: My laptop acer aspire 5720zg dead (no power and lights)

                  3.3V on pin21

                  Comment

                  • robrock1
                    Senior Member
                    • Jul 2013
                    • 129
                    • Ghana

                    #10
                    Re: My laptop acer aspire 5720zg dead (no power and lights)

                    see if any of the diodes or transistors is shorted in this area

                    Comment

                    • lord
                      Badcaps Veteran
                      • May 2011
                      • 319
                      • Croatia

                      #11
                      Re: My laptop acer aspire 5720zg dead (no power and lights)

                      Originally posted by povilas602
                      3.3V on pin21
                      Are you sure?
                      PL2 and pin21 should be connected. You should have 19V there.

                      Comment

                      • povilas602
                        Member
                        • Jan 2014
                        • 10
                        • nera

                        #12
                        Re: My laptop acer aspire 5720zg dead (no power and lights)

                        Now I checked PU3 PIN21 is 3.3V, but in #5 comment picture i mark two place where getting hot. Maybe PD2,PR2,PR3,PR4,PR5,PR6,PR7,PR8 in this place heat up. PL2 3.2V.
                        Last edited by povilas602; 01-17-2014, 10:02 AM.

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                        • povilas602
                          Member
                          • Jan 2014
                          • 10
                          • nera

                          #13
                          Re: My laptop acer aspire 5720zg dead (no power and lights)

                          I found PD2 and PD3 diodes broken.

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                          • robrock1
                            Senior Member
                            • Jul 2013
                            • 129
                            • Ghana

                            #14
                            Re: My laptop acer aspire 5720zg dead (no power and lights)

                            so its working now?

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                            • povilas602
                              Member
                              • Jan 2014
                              • 10
                              • nera

                              #15
                              Re: My laptop acer aspire 5720zg dead (no power and lights)

                              Does not work, when PD3 don't been soldered, then PL2 was 19.2V, but when PD3 was soldered, then PL2 fell to 3.3V. What else to check?
                              Last edited by povilas602; 01-18-2014, 03:52 AM.

                              Comment

                              • povilas602
                                Member
                                • Jan 2014
                                • 10
                                • nera

                                #16
                                Re: My laptop acer aspire 5720zg dead (no power and lights)

                                So no one can advise what to check?

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                                • whaldsz
                                  Badcaps Veteran
                                  • Apr 2013
                                  • 395
                                  • Philippines

                                  #17
                                  Re: My laptop acer aspire 5720zg dead (no power and lights)

                                  Check the resistance across PC6. If low resistance, remove PU2 and test again.

                                  Comment

                                  • djmdk
                                    New Member
                                    • Nov 2013
                                    • 2
                                    • România

                                    #18
                                    Re: My laptop acer aspire 5720zg dead (no power and lights)

                                    Hello,
                                    I have the exact same problem as you do. How did you fix your motherboard? Can you please help me?
                                    Thank you!

                                    Comment

                                    • djmdk
                                      New Member
                                      • Nov 2013
                                      • 2
                                      • România

                                      #19
                                      Re: My laptop acer aspire 5720zg dead (no power and lights)

                                      Anyone?

                                      Comment

                                      • mcthr
                                        Member
                                        • Aug 2019
                                        • 25
                                        • Philippines

                                        #20
                                        Re: My laptop acer aspire 5720zg dead (no power and lights)

                                        if the 3.3 volts is intermittent supply does dc to dc is faulty. im working in Acer V3 series ty dor the reply

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