compaq CQ43 cant on list volt measured

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  • sasser
    Badcaps Veteran
    • Dec 2012
    • 364
    • Malaysia

    #1

    compaq CQ43 cant on list volt measured

    hye all masta and guru


    i got 1 laptop compaq cq43 . please refer attachment where i attach schematic for this motherboard.

    1st i found mosfet on Q0902 is burn mark.the mosfet model is AO4406A then im replace with wrong mosfet AO4407 .after i on the laptop Q0901 was burned then i know i make the mistake when change wrong mosfet. p channel cant change with N channel . but im learn now that mistake

    im now already change new A04406A but still no power.

    im measure

    Q0902 no volt on all pin
    Q0901 19v on pin 5,6,7,8

    the IC pwr charge TPS51123 im measure 13,14,15,16 no volt

    the TPS51123 for 3v 5v i measure pin 22 got 3v pin 4 3v pin8 3v pin 9 5v pin 13 3.91v pin 16 19v pin 17 5v pin 22 5v

    please help me. thanks for advance
    Attached Files
  • sasser
    Badcaps Veteran
    • Dec 2012
    • 364
    • Malaysia

    #2
    Re: compaq CQ43 cant on list volt measured

    Hye anybody can help me?

    Comment

    • ktmmotocross
      Boardkiller
      • Feb 2014
      • 3577
      • slovakia

      #3
      Re: compaq CQ43 cant on list volt measured

      no woltage on pins 22 and 11? measure resistance to groung on this pins

      Comment

      • aanan
        Badcaps Veteran
        • Dec 2010
        • 222
        • India

        #4
        Re: compaq CQ43 cant on list volt measured

        no voltage on pins 16 measure resistance to ground on this pins & check R1011 D1004 & realated track.

        Comment

        • sasser
          Badcaps Veteran
          • Dec 2012
          • 364
          • Malaysia

          #5
          Re: compaq CQ43 cant on list volt measured

          pin 16 18.6v pin 22 5v pin 11 no volt.

          Comment

          • ktmmotocross
            Boardkiller
            • Feb 2014
            • 3577
            • slovakia

            #6
            Re: compaq CQ43 cant on list volt measured

            check voltage on pins 20 and 13

            Comment

            • sasser
              Badcaps Veteran
              • Dec 2012
              • 364
              • Malaysia

              #7
              Re: compaq CQ43 cant on list volt measured

              hye ktmmotocross im measured TPS51123

              pin 20 = 0V
              pin 13 = 4.45v
              pin 16 = 18v
              pin 17 = 4.94
              pin 20 = 0v

              on IT8518 RSMRST no volt .

              power button i got 3v and bios ic also i got 3v there.

              Comment

              • ktmmotocross
                Boardkiller
                • Feb 2014
                • 3577
                • slovakia

                #8
                Re: compaq CQ43 cant on list volt measured

                what about resistance to groung on L1001?

                Comment

                • sasser
                  Badcaps Veteran
                  • Dec 2012
                  • 364
                  • Malaysia

                  #9
                  Re: compaq CQ43 cant on list volt measured

                  L1001,L1002 & L0901 both side >1ohm

                  Comment

                  • sasser
                    Badcaps Veteran
                    • Dec 2012
                    • 364
                    • Malaysia

                    #10
                    Re: compaq CQ43 cant on list volt measured

                    Anyone can help here. I dont know how to determine ic tps 51123 is damaged or still ok.

                    Comment

                    • sasser
                      Badcaps Veteran
                      • Dec 2012
                      • 364
                      • Malaysia

                      #11
                      Re: compaq CQ43 cant on list volt measured

                      update info:

                      now im reflash bios and i see on PSU current ampere is 5.0A means short some where. mosfet at Q0906 very hot when touch with finger. im check on gate pin Q0906 i got value 1.8v. i pull out the mosfet and test its ok. and then i measured again pin pad no 4 and got value 9.67v. checked on component resistor R0930 also 9.67v C0926 one side 19v anotherside 9.67v

                      so what the next clue? please help me.

                      Comment

                      • sasser
                        Badcaps Veteran
                        • Dec 2012
                        • 364
                        • Malaysia

                        #12
                        Re: compaq CQ43 cant on list volt measured

                        im got pin4 3.6v on mosfet Q0906

                        Originally posted by sasser
                        update info:

                        now im reflash bios and i see on PSU current ampere is 5.0A means short some where. mosfet at Q0906 very hot when touch with finger. im check on gate pin Q0906 i got value 1.8v. i pull out the mosfet and test its ok. and then i measured again pin pad no 4 and got value 9.67v. checked on component resistor R0930 also 9.67v C0926 one side 19v anotherside 9.67v

                        so what the next clue? please help me.
                        Attached Files

                        Comment

                        • whaldsz
                          Badcaps Veteran
                          • Apr 2013
                          • 395
                          • Philippines

                          #13
                          Re: compaq CQ43 cant on list volt measured

                          Originally posted by sasser
                          update info:

                          now im reflash bios and i see on PSU current ampere is 5.0A means short some where. mosfet at Q0906 very hot when touch with finger. im check on gate pin Q0906 i got value 1.8v. i pull out the mosfet and test its ok. and then i measured again pin pad no 4 and got value 9.67v. checked on component resistor R0930 also 9.67v C0926 one side 19v anotherside 9.67v

                          so what the next clue? please help me.
                          1. Resistance of R0906 with respect to ground?
                          1. pin4 of Q0906 is connected to R0930 but your measurement on pin 4 of Q0906 IS 1.8v and R0930 is measured as 9.67v? Please check this measurement again.

                          2. how about pin 1,3,6, 8, 13 of U1001, what are the voltage readings?
                          3. Resistance of L1001 and L1002 to ground?
                          Last edited by whaldsz; 05-29-2015, 12:28 AM.

                          Comment

                          • ktmmotocross
                            Boardkiller
                            • Feb 2014
                            • 3577
                            • slovakia

                            #14
                            Re: compaq CQ43 cant on list volt measured

                            thats some big difference between measures

                            what is voltages and resistance to ground on q0903?

                            Comment

                            • sasser
                              Badcaps Veteran
                              • Dec 2012
                              • 364
                              • Malaysia

                              #15
                              Re: compaq CQ43 cant on list volt measured

                              Originally posted by whaldsz
                              1. Resistance of R0906 with respect to ground?
                              1. pin4 of Q0906 is connected to R0930 but your measurement on pin 4 of Q0906 IS 1.8v and R0930 is measured as 9.67v? Please check this measurement again.

                              2. how about pin 1,3,6, 8, 13 of U1001, what are the voltage readings?
                              3. Resistance of L1001 and L1002 to ground?
                              1. Resistance R0906 zero ohm both side
                              im measure again sorry for my mistake and i got same value at all line connected to Q0906 pin4. which means 2.7V on pin 4 ,2.7v on R0930 and 2.7v on pin no 3 U0902
                              2. now zero volt after short become. before this not hot component and u can see my port ealier.
                              3.L1001 & L1002 both side zero ohm

                              Comment

                              • sasser
                                Badcaps Veteran
                                • Dec 2012
                                • 364
                                • Malaysia

                                #16
                                Re: compaq CQ43 cant on list volt measured

                                Originally posted by ktmmotocross
                                thats some big difference between measures

                                what is voltages and resistance to ground on q0903?
                                resistance to gound on Q0903 is zero ohm and no beeps from continuity selected
                                then the volt i got 2.7~2.8v

                                Thanks for help me

                                Comment

                                • sasser
                                  Badcaps Veteran
                                  • Dec 2012
                                  • 364
                                  • Malaysia

                                  #17
                                  Re: compaq CQ43 cant on list volt measured

                                  update:

                                  sorry all my friend. i know why Q0906 was shorted. i check on detail i found Q1004 was wrong place. then i do correction with pull and place back

                                  now no shorted and no hot area there. but still cant power on the laptop. i read my PSU measure 0.0250A more than normal
                                  pin 1 0volt ,3 1.21v,6 0v, 8 0v, 13 3.47v of U1001

                                  Comment

                                  • ktmmotocross
                                    Boardkiller
                                    • Feb 2014
                                    • 3577
                                    • slovakia

                                    #18
                                    Re: compaq CQ43 cant on list volt measured

                                    PIN 3 must be 2v, VIN?

                                    Comment

                                    • whaldsz
                                      Badcaps Veteran
                                      • Apr 2013
                                      • 395
                                      • Philippines

                                      #19
                                      Re: compaq CQ43 cant on list volt measured

                                      Replace U1001. This chip is broken.
                                      Last edited by whaldsz; 05-29-2015, 09:36 PM.

                                      Comment

                                      • sasser
                                        Badcaps Veteran
                                        • Dec 2012
                                        • 364
                                        • Malaysia

                                        #20
                                        Re: compaq CQ43 cant on list volt measured

                                        VIN at U1001 is 2.54v . i need to replce this ic fisrt ? then i noticed here

                                        Comment

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