Lenovo NM-C711

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  • ziko07
    Senior Member
    • Jun 2021
    • 93
    • Somewhere

    #1

    Lenovo NM-C711

    Hi,

    I have this laptop with shorted high side mosfet to cpu vcc
    It has two phase cpu core vcc
    When remove coils on mcu side I get short 0.4 Ohms on other side
    With diode test voltage drops is 0v , on other side of coil is 0.4v what is ok, noshort, but strange without 2 mosfet installed on one phase I got 4.22v (maybe need to install fets)
    So I guess mcu shorted or some cap but unforcenatly not have thermal camera and cant fill heat of any cap.
    I think this power vcc to cpu should be 1.72v, I inject only 0.8v
    All always voltage is ok, 3v3 1v8 and 5v
    With coil on vcc core removed power button led is ON and charging ok, when install coils flash and goes off
    Tnx
    Attached Files
  • ziko07
    Senior Member
    • Jun 2021
    • 93
    • Somewhere

    #2
    Re: Lenovo NM-C711

    pin 26, 27 shorted on IC thats why 4.25v on fet

    P.S. MCU shorted, I give up
    Last edited by ziko07; 08-31-2023, 07:05 AM.

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