Lenovo Z570 - no image

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  • sicilianul
    Senior Member
    • Jul 2014
    • 70
    • Romania
    #1

    Lenovo Z570 - no image

    Hello,

    I have 3 mb's Lenovo z570 ( 10290-2 48 44pa01 021 LZ57 )

    2 of them are auto-power on. I have only 1 vcore wich is initialy 1.1v and after ~1sec is 0.6v and after 3 sec is powering off. Bios is ok, memory 1.5v, video 1v tested with 3 processors, 3.3v and 5v are ok.

    Another mb has a strange sinusoid on video power supply. see here https://ibb.co/bdMWFs1

    Do you have any ideas?
    Tags: None
    • Techtiger
      Badcaps Legend
      • Oct 2014
      • 1602
      • france
      #2
      Re: Lenovo Z570 - no image

      rest of the coil voltages are ok ? resistance on PL4101 PL4102
      test VCC CORE VCC GFXCORE
      1D8V VGA
      3D3V VGA
      1V VGA

        Comment

        • sicilianul
          Senior Member
          • Jul 2014
          • 70
          • Romania
          #3
          Re: Lenovo Z570 - no image

          Hello, after 1 year I've managed to repair one of the motherboards. Problem was PU4307 which was heating excessively, after I've removed - the pads was on fire. Changed also the PU4306 - shortcircuit between PIN 7 and PIN 8.

          Now - the second motherboard is same design as first. Next voltages are powering up: 3.3, 5v, 1.5memory.

          But I have a small problem: VCC GFXCORE isn't powering up. PU4405 has PIN2 PWM very low ~2v without oscilation. PWR_CPUCORE_PWMA is coming from PU4201 and I have allready change it, but no effects. Any idea?

            Comment

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