820-3437 A1466 MBA Missing P5VS4RS3_EN U7600

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  • macattack600
    Senior Member
    • Aug 2011
    • 97
    • USA
    #1

    820-3437 A1466 MBA Missing P5VS4RS3_EN U7600

    Hi I had all rails up but no PP5V_S5 problem was no SMC_PM_G2_EN I replace SMC reball I now have--- PP5V_S5 @5v and P5VP3V3_VREF2 @ 2v

    I check down rails next PP5V_S4RS3 on C7600 Fan turns on with meter probes only touching for few seconds all rails come up , all caps resistors around U7600 same thing fan runs with only meter touching for a 4 seconds and stops.

    I had green to orange light before and after I change SMC.

    When I test at Pin 12 of U7600 fan turn on for as long as I leave meter probes to.

    U7501 Pin 21 gives P3V3S5_EN_R 3.3v but P5VS4RS3_EN 0v? PCH PM_SLP_S4_L bad ? or U7600 maybe?
    Last edited by macattack600; 10-16-2016, 08:58 PM.
    Tags: None
    • Rashid36
      Senior Member
      • Aug 2014
      • 59
      • Saudi Arabia
      #2
      Re: 820-3437 A1466 MBA Missing P5VS4RS3_EN U7600

      Bro did u find problem ???????

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