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sony vaio PCG-7141L NO POWER

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    sony vaio PCG-7141L NO POWER

    Hi everyone this is the first time i troubleshoot this motherboard I need help and advise on this I have receive this Sony vaio vgn-ns140e Model no;PCG-7141L and motherboard number; MBX 202 M790 IP-0087J01 REV.1.1 which is NO POWER no led light and battery charge light but there is 19.9 volts on dc. here is the measurement below;

    PQ24 PIN 1.19.9V
    2. 19.9V
    3. 19.9V
    4. 4.17V
    5. 19.9V
    6. 19.9V
    7. 19.9V
    8. 19.9V
    PQ25 PIN 1.19.9V
    2. 19.9V
    3. 19.9V
    4. 19.9V
    5. 2.55V
    6. 2.55V
    7. 2.55V
    8. 2.55V

    PU1 BQ2475 PIN 1. 3.3V
    2. 2.5V
    3. 2.5V
    4. 2.5V
    5.4..17V
    6. 1.69V
    7. 0.05V
    8. 2.82V
    9. 0.05V
    10. 3.34V
    11. 3.34V
    12. 1.14V
    13. 2.5V
    14. 2.5V
    15.0.08V
    16. 0V
    17. 0.14V
    18.0.05V
    19. 0.05V
    20. 0.05V
    21.0.05V
    22.0.05V
    23.0.05V
    24.0.05V
    25.0.05V
    26.0.05V
    27.0.05V
    28. 19.79V
    PU12 the bios chip has voltage on pin3 1.6v, pin 7 2.4v pin 8 2.4v and there is no 3v on power switch

    anyone please help me advise what is the culprit on this board please thanks in advance
    Last edited by Romulo; 02-19-2017, 07:13 AM.

    #2
    Re: sony vaio PCG-7141L NO POWER

    hi
    on pq25 at pin 5678 there must be 19v
    check if there is a short to ground
    or remove PR9 and check 19v at pin 5678 at pq25

    Comment


      #3
      Re: sony vaio PCG-7141L NO POWER

      check your I/O (KBC) controller..may be it short..check it VCC pin how many voltage it receiving..it must 3.3v on vcc if it is less than 3v and also check with finger 3v/5v driver ic if KBC is short then 3v/5v driver ic will be heatup..

      Comment


        #4
        Re: sony vaio PCG-7141L NO POWER

        thanks for the response @mielta i remove PR9 now there is 3.55v on PQ25 PIN 5678 before there is only 2.55v but still not reaching 19v and also notice PL 1 indutor 100 has only reading of 0.5v.and PL2 capacitor have 0voltage any advise please i need help on this
        Last edited by Romulo; 02-19-2017, 07:20 PM.

        Comment


          #5
          Re: sony vaio PCG-7141L NO POWER

          @smalli there is no short on kbc

          Comment


            #6
            Re: sony vaio PCG-7141L NO POWER

            anyone please advise and help on this please I have attached the schematic
            Attached Files

            Comment


              #7
              Re: sony vaio PCG-7141L NO POWER

              Anyone please help

              Comment


                #8
                Re: sony vaio PCG-7141L NO POWER

                Update after i replace pr9 and remove again and test now there is no voltage on pq25 pin5678 and no voltage on the pads of pr9 any help please

                Comment


                  #9
                  Re: sony vaio PCG-7141L NO POWER

                  anyone please help me to find the culprit on this.or can anyone share working bios for this ill try to flash bios

                  Comment


                    #10
                    Re: sony vaio PCG-7141L NO POWER

                    any help on this please

                    Comment


                      #11
                      Re: sony vaio PCG-7141L NO POWER

                      Hi
                      You must check PQ25 und PU1 inf any Short

                      best regards

                      Comment


                        #12
                        Re: sony vaio PCG-7141L NO POWER

                        I already checked pu1 above post is the reading after i remove the Pr 9 there is no voltage on pin 5678 on pq25 and i checked the resistance of pq25 pin 5678 it shows 0.35ohms the same at the pads of pr9 once it remove any advise please

                        Comment


                          #13
                          Re: sony vaio PCG-7141L NO POWER

                          PU1 pin 5 is not correct ACDEC should be fixed PD6 could be faulty or the voltage from page 42 AC_OFF.
                          Last edited by cyberhack; 02-21-2017, 04:35 AM.

                          Comment


                            #14
                            Re: sony vaio PCG-7141L NO POWER

                            Hi
                            Remove the Battery and Powersupply then give 19v at pq25 pin 5678 with
                            a Labsuply
                            Check witch piece would be hot.

                            Comment


                              #15
                              Re: sony vaio PCG-7141L NO POWER

                              Hi
                              Thats also possible what Cyberhack said i had this problem also by an Sony Labtop
                              After i dissconnet the Biosbattery for a moment
                              the Machine run again

                              Comment


                                #16
                                Re: sony vaio PCG-7141L NO POWER

                                All so look for spillage and yes i have had laptop start after bios battery discharge.

                                Comment


                                  #17
                                  Re: sony vaio PCG-7141L NO POWER

                                  Thanks for the response guys i checked pd6 you are right cyberhacl it is shorted to the ground @ mielta i cannot inject 19.5v at pq25 pin 5678 cause i dont have psu lab.ill try to change pd6.and also can i change pr9 to R020 cause original is R015 and i dont have spare.

                                  Comment


                                    #18
                                    Re: sony vaio PCG-7141L NO POWER

                                    Hi
                                    Please disconnect Biosbatterie and messure PD6 again

                                    Comment


                                      #19
                                      Re: sony vaio PCG-7141L NO POWER

                                      Remove bios battery still only 0.45volts i already change pd 6 and pu1 still there is no voltage on pq25 pin 5678 replace pr 9 still the same there is no 3v on power switch.

                                      Comment


                                        #20
                                        Re: sony vaio PCG-7141L NO POWER

                                        Convert a pc power supply to use .
                                        http://makezine.com/projects/compute...upply-adapter/
                                        https://www.youtube.com/watch?v=z2oSFpKh_Uw

                                        Comment

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