Does anyone know if these values ​​are appropriate? Board NM-C871 rev 2.0 Ideapad Gaming Lenovo

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  • valente222
    Senior Member
    • Feb 2021
    • 85
    • PERU

    #1

    Does anyone know if these values ​​are appropriate? Board NM-C871 rev 2.0 Ideapad Gaming Lenovo

    I have this equipment that leaked moisture from the bottom, which the PQ3201 damaged the track and does not turn on the machine. remove all two mosfets from that area such as PQ3201(high) AND PQ3202(low). these feed the VCCSA rail. but on this track it has a very low resistance, approaching my absolute zero of my tester to ground (1.3ohm). Could the CPU be bad? I have made this measurement by desoldering the PL3201 coil, taking that measurement on the CPU side.

    On the other hand, on the mosfet side, the PU3201 controller, which is the pwm controller, appears to have a damage since it shorted out some new mosfets that I soldered when powering up the board.

    other measurements on GPU.
    NVVDD= 1.6ohm
    FBVDDQ= 32.1ohm

    my absolute zero from my tester to GND is about 1.3 ohm, I measure the VCC CORE part and it has a 1.5ohm resistance. laptop is a gamer and I know that its resistance tends to be low, but I want to know if it is a wrong measurement or is the CPU in the trash?​
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  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Touching the probes of your multimeter ,you get a value of 1.3 ohms.correct?
    If so,resistance to GND on Vcore is too low(1.5-1.3=0.2 ohms)
    Resistance expected is around 0.8 ohms for 9th/10the gen intel cpu for gaming board.

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