Hp cq61 doesn't turn on (+vgacore)

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  • NConstantinou
    Badcaps Veteran
    • May 2017
    • 329
    • Cyprus
    #1

    Hp cq61 doesn't turn on (+vgacore)

    I am not too expert on laptop motherboards but i have the knowledge to handle them.
    i have this laptop which doesn't turn on. After testing i found that Vin is shorted
    and following a schematic diagram i noticed that the cause is +VGACORE.
    I removed L5 (CPU coil) which is connected to +VGACORE and short disappeared.
    i used BGA machine to reheat BGA ic but short is still there.

    is it possible by reheating BGA the short remains or do i missed something.

    Thanks
    N. Constantinou
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: Hp cq61 doesn't turn on (+vgacore)

      By "Vin" you mean the +VIN line?
      If it's true, it means that you have a shorted high-side MOSFET on the +VGACORE regulator.
      It would help to know which motherboard you have inside the computer
      Assuming Quanta OP6, I'm talking about PQ58 shorted between source and drain.
      Also if the GPU itself is shorted, reheating it will not make it work. A GPU power line will look like a short when measured on a multimeter, ie. around 10 ohms, but that's fine. A shorted GPU will usually show a resistance lower than 2 ohms.

      Also I'm not sure what does "L5 (CPU coil)" refer to.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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        • RJARRRPCGP
          Badcaps Legend
          • Jul 2004
          • 6304
          • USA
          #3
          Re: Hp cq61 doesn't turn on (+vgacore)

          Is this AMD CPU-based?
          ASRock B550 PG Velocita

          Ryzen 9 "Vermeer" 5900X

          32 GB G.Skill RipJaws V F4-3200C16D-32GVR

          Arc A770 16 GB

          eVGA Supernova G3 750W

          Western Digital Black SN850 1TB NVMe SSD

          Alienware AW3423DWF OLED




          "¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo

          "There's nothing more unattractive than a chick smoking a cigarette" -Topcat

          "Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

          "did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

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