HP DV5 Intel/nvidia (Quanta QT6) turns off after 1 second when cold - Solution

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  • Th3_uN1Qu3
    Believe in
    • Jul 2010
    • 6031
    • Romania
    #1

    HP DV5 Intel/nvidia (Quanta QT6) turns off after 1 second when cold - Solution

    Another quick one. Problem: LEDs light for 1 second then off. After a few dozen tries, or if the laptop is warmed up a little, it works fine.

    Normally this behavior is cold joints on the Northbridge, requiring a reball, but that's on the AMD version with the HD3200 chipset. This one is Intel/nvidia based, and it doesn't have a GPU from the affected series, either. I haven't checked but i think the GPU is a 9400M or a 9600M. Also when the BGA is bad or has cold joints, it does other nasties as well. This laptop showed no problems when it did start up.

    I took some measurements and noticed that GPU Vcore does not come up when it won't start. So i resoldered PU3 that's under the fan there. That one's doing the GPU Vcore.

    It started up first time but after i let it cool down it refused to start once again. I still suspected it to be a cold joint on a power IC, not some BGA, so i took the hot air station and started briefly warming up areas of the board, while pushing the power button. When i reached PU1 it instantly sprang to life.

    I took a closer look at it and what's that... an ISL6262A. It's controlling the CPU Vcore. I remember that from here. CPU Vcore did come up even when it wasn't starting, but i decided to try touching up the solder on that anyway.

    Sure enough, resoldering the ISL6262A fixed it. I have left the laptop powered off for 10 minutes and then turned it back on - no problem. The soldering looked perfect but you can never be sure.
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    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!
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    • Th3_uN1Qu3
      Believe in
      • Jul 2010
      • 6031
      • Romania
      #2
      Re: HP DV5 Intel/nvidia (Quanta QT6) turns off after 1 second when cold - Solution

      Had another problem with this thing - it would shut down after a few seconds of GPU load - even just enabling Aero. Not reboot or BSOD - hard shut down. If i pressed the power button, it would power back on.

      Tantalum capacitor PC183, the black one under the U1 ISL6262A, was slightly bloated. I don't think it's visible in the pic, but compared to the ones next to the CPU bracket, its top was definitely curved.

      Replaced that capacitor and it no longer shuts down now. This is a fault that could easily have been blamed on the GPU yet it had nothing to do with it. The GPU is a 9200M GS btw - pretty much a piece of crap. But hey, at least it ain't broken.
      Last edited by Th3_uN1Qu3; 12-03-2014, 04:06 PM.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

        Comment

        • dj_ricoh
          Badcaps Legend
          • Jan 2013
          • 2073
          • uk
          #3
          Re: HP DV5 Intel/nvidia (Quanta QT6) turns off after 1 second when cold - Solution

          Originally posted by Th3_uN1Qu3
          Had another problem with this thing - it would shut down after a few seconds of GPU load - even just enabling Aero. Not reboot or BSOD - hard shut down. If i pressed the power button, it would power back on.

          Tantalum capacitor PC183, the black one under the U1 ISL6262A,
          the 330uF?

          and the ISL6262A was hot?? or normal temp? i have a sony at work does the same but i saw in a post it was bios corruption so did not even bother to check the Vcore OMG!!

          and i saw this in a few mainboards . one i fix it but i did not knew how i tought it was chipset related cuz i cook the board but it was the IC but when i think now it actually did cook the whole board HAHAHHAHA Irony you could B*#@H
          Last edited by dj_ricoh; 12-03-2014, 04:35 PM.
          Just cook it! It's already broken.

            Comment

            • Th3_uN1Qu3
              Believe in
              • Jul 2010
              • 6031
              • Romania
              #4
              Re: HP DV5 Intel/nvidia (Quanta QT6) turns off after 1 second when cold - Solution

              Yes that 330uF capacitor was bloated.

              The ISL6262A did not get hot. This board maybe had a minor liquid spill at some point which damaged the soldering on the ISL6262A and the cap. It was clean but somebody had changed the thermal paste on the CPU recently - so whoever did that likely cleaned the board of any traces of liquid, too.

              To test a proper "cold start" I put it by the open window and forgot it there - it actually got some condensation when i took it back in , so i waited for a couple minutes before turning it on.

              It turned on first time and works just fine.
              Last edited by Th3_uN1Qu3; 12-03-2014, 04:45 PM.
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

                Comment

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