lenovo ideapad 320-15ikb power problem

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  • menshawy
    Badcaps Veteran
    • Aug 2013
    • 400
    • egypt

    #1

    lenovo ideapad 320-15ikb power problem

    hi friends
    i have lenovo ideapad 320-15ikb MB NM-B241
    pq311 gate vlot is not active
    pf101 19v ok
    pl101 19v ok
    pq311 pin5 19v ok
    pq311pin4 0v
    i found pc301 was changed ,i change it again
    i changed pu301 (BQ24780S)
    pu301
    pin28 vcc 19v ok
    pin6 ACDET 2.8v ok
    pin5 ACOK 0v ok
    pin3 CMSRC 0v
    pin4 ACDRV 0v
    pin24 REGN 6v ok
    if i connect pq311 pin5 and pin 1,2,3 laptop work ok without charge battery
    help please
    thanks
  • mon2
    Badcaps Legend
    • Dec 2019
    • 14001
    • Canada

    #2
    Re: lenovo ideapad 320-15ikb power problem

    hi.

    1) PQ311, remove all power & meter in resistance mode.

    resistance between:

    source & drain ?

    source & gate

    gate & drain ?

    2) PQ312 - take the same measurements.

    Guidance material - see resistance chart :

    http://electronicsbeliever.com/how-t...-is-defective/

    3) meter in DC voltage mode -> apply adapter power.

    what is the voltage @ PR310, pin 2 ? It should be DCIN + 6 volts (about).

    From your observation of bypassing PQ311 - PQ311 is most likely defective.

    In general, do not bypass mosfets as this could lead to other part damage. Better to check the resistance as per the above article to verify if the mosfet is shorted or not.

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