CQ61 turn on and off ..not finding culprit here , help !

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  • highpulse
    i hate HP
    • May 2013
    • 1488
    • portugal
    #1

    CQ61 turn on and off ..not finding culprit here , help !

    Hey guys ,

    Well got this one in the bench , and its giving me a bit of headhack ..
    symptom : turn on then off after 1 sec . it happen to turn on once or twice with no problem , but still always doing the same now , on and off.
    Cheked all coils to GNG - OK
    Cheked S3 and S5 to KBC - OK (even like this replaced ENE D2,the same )
    Flashed bios - OK
    Cheked main starter signal , RSMRST - OK
    PLTRST - not beeing feeded by Southbridge as it should .. this could be a problem , but not sure south bridge fault .
    Cheked main lines once S0 is deploy , all voltages goes ok on coils.

    weird thing is not having PLTRST and im getting all voltages during this second the machine is ON .

    Battery does charge normally .
    Tags: None
    • highpulse
      i hate HP
      • May 2013
      • 1488
      • portugal
      #2
      Re: CQ61 turn on and off ..not finding culprit here , help !

      maybe something on discharge i dont know , if she stay a bit of time without power , once i press on , she will turn on and stay on ,, after few attemps goes to same symptom , on and off .. kind weird

        Comment

        • highpulse
          i hate HP
          • May 2013
          • 1488
          • portugal
          #3
          Re: CQ61 turn on and off ..not finding culprit here , help !

          weird thing also , everytime machine do that if i give a bit of heat on the clock gen ic , it wil turn on no problem , gives image etc all good
          so relaced clock gen and crystal ... but does the same ... only giving a bit of heat it will work

            Comment

            • ala_borbe
              aka Donald
              • Apr 2011
              • 1625
              • Malta
              #4
              Re: CQ61 turn on and off ..not finding culprit here , help !

              it must be cold joint... same symptoms i had with famous nvidia 6150 or so if i remember correctly...
              after reflow, it worked fine
              i understand its other platform, but by the symptoms problems sound like cold joint
              Im Back... sort of...

                Comment

                • polytek
                  Badcaps Veteran
                  • Dec 2013
                  • 496
                  • TUNISIA
                  #5
                  Re: CQ61 turn on and off ..not finding culprit here , help !

                  agree to ala_borbe

                    Comment

                    • PlusCom
                      Senior Member
                      • May 2013
                      • 50
                      • Greece
                      #6
                      Re: CQ61 turn on and off ..not finding culprit here , help !

                      Number of your southbridge?

                        Comment

                        • highpulse
                          i hate HP
                          • May 2013
                          • 1488
                          • portugal
                          #7
                          Re: CQ61 turn on and off ..not finding culprit here , help !

                          IBM . but alltough the clock gen is far far away from SB , and when i mean saying giving a bit of heat ,its just a bit of heat , like 1 or 2 second , can be a could joint , but if it is its around the small smd components around the clock gen .

                            Comment

                            • ala_borbe
                              aka Donald
                              • Apr 2011
                              • 1625
                              • Malta
                              #8
                              Re: CQ61 turn on and off ..not finding culprit here , help !

                              put some flux all around, reflow whole area around and test again
                              Im Back... sort of...

                                Comment

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