Lenoovo yoga 3 14 not power on

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  • asem18
    Senior Member
    • Oct 2016
    • 112
    • my workshop

    #1

    Lenoovo yoga 3 14 not power on

    Hello folks. Lenovo yoga 3 14 not power on.
    Coming from another repair shop..find Q23 burning and change it .
    No amp taken when i push button , PQ101 = 0.500v and decreasing.
    Try to find ADIN_1 , from charger connecter to
    PQ107 ( P-channel ) = Drain 19.01v
    gate = 18.30
    S = 18.65v.

    PQ106 ( P-channel ) = S= 19.65v
    Gate = 18.50V
    Drain = 0V ( ADIN_1 )

    What to sheck else please..thank you.

    Link to schematic - https://www.badcaps.net/forum/troubl...a381-schematic
    Last edited by asem18; 02-17-2020, 04:10 AM.
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: Lenoovo yoga 3 14 not power on

    PR119 & PR128 forms the voltage divider for PQ106 gate. Voltage divider is obviously not working-so you need to check what's wrong. Remember a voltage divider circuit will work only and only if:
    01.There is more then one resistor involved in the circuit
    02.VCC is present on one end and ground reaches the other end of circuit.

    Measure charging ic pins and report back.

    Comment

    • asem18
      Senior Member
      • Oct 2016
      • 112
      • my workshop

      #3
      Re: Lenoovo yoga 3 14 not power on

      Thank you mcplslg...yes for the divider , and will must find = 10 Volt...but for Pr119 = 18.65v on each side...for Pr 128 =17.50v and decreasing from the two side.

      For charging ic ,since we don't have vcc on it = pin 20...i have nothing !...pin 4/5/6/20 = 0v

      Comment

      • tesnic
        Member
        • Jun 2022
        • 43
        • Spain

        #4
        I have exactly the same problem. Same voltage values on pq106 and pq107. ADIN-0 without voltage... How do you resolve it? Thanks ans sorry to reflote it...

        Comment

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