a2337 PP5V_S2 missing no short.

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  • khj
    Member
    • Jun 2023
    • 14
    • korea
    #1

    a2337 PP5V_S2 missing no short.

    I have a a2337 m1 MacBook Air that has no power.
    PP5V_BSTLQ_SPMU is shorted so I fix it by change cap, coil, u7700. now normal voltage.

    when I didn't connect battery , plugged in power, there is only 5V 0.25a.
    so I checked every power rails , I finally founded PP5v_s2 is 0v, but there is no short.
    PPBUS_5VS2_VIN = 12V normal
    P5VS2_EN from U8100 = 0.6V maybe normal

    P5VS2_FB,PGOOD,VC,SS,BIAS,INTVCC = very low voltage maybe abnormal.

    what should I do ?? do I need to change uc300?
    Last edited by khj; 12-06-2023, 07:05 AM.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14045
      • Canada
      #2
      The enable voltage may be too low. Check the resistance to ground of this enable signal line (without any power to the board).

      Also, review this video:

      https://academy.chinafix.tech/shipin...JoiBo7o_dMvDQQ

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