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[SOLVED]820-3330 stuck in a loop

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  • arash
    replied
    It was the battery indicator flex cable. Now everything is smooth as it should. Appreciate the help guys!

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  • dukefawks
    replied
    Probably bad battery indicator or corrosion in the connector pulling SMC_LID low. VP0R is Q5300, so probably corrosion around there.

    Leave a comment:


  • arash
    replied
    Thank you. One line from the two was cut and fixed. Now PPBUS measured at 12.7V, the device finally runs.
    It is getting into sleep mode randomly and ASD shows only one error with VP0R sensor, which is measured too low

    Leave a comment:


  • dukefawks
    replied
    between 17 and 18 should be 2.2ish. Check what is going on there.

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  • arash
    replied
    The resistance between pins 17 and 18 is 0 ohm, also between 27 and 28. R7005 is 20 ohm. Thank you for your replies

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  • aprendiz
    replied
    Read my request again and answer....

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  • arash
    replied
    I guess you meant those 2 current sensing circuits, resistors R7020 and R7050 - those are measured at 0 ohm, as they should I think. R7005 is measured at 20 ohm so those look to be alright

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  • aprendiz
    replied
    Measure resistance between pins 17/18 and 27/28 from U7000 also check R7005 value........

    Leave a comment:


  • arash
    replied
    PPBUS is not stable. It changes from 3.3V to 10.7V (during this loopy process)

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  • dukefawks
    replied
    10.6 on PPBUS makes no sense. If Vcore is stable at 1.1V the fan should be running normal.

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  • arash
    replied
    PPBUS was measured with the charger connected, no battery attached.
    My bad, I meant:
    ppvcore_s0_cpu=1.1v , ppvcore_s0_axg=0v , pp1v05_s3_cpu_vccdq=1.5v , pp1v05_s0_cpu_vccpqe=1.05v ,PPVCCSA_S0_CPU=0.8V

    Leave a comment:


  • dukefawks
    replied
    I assume this was measured on battery else PPBUS is way too low.
    PP1V05 is of course not correct at 0.8V but makes no sense as pp1v05_s0_cpu_vccpqe is directly connected to it......

    Leave a comment:


  • arash
    replied
    Ppbus_g3h=10.6v , pp3v3_s5=3.3v ,
    ppvcore_s0_cpu=1.1v , ppvcore_s0_axg=0v , pp1v05_s3_cpu_vccdq=1.5v , pp1v05_s0_cpu_vccpqe=1.05v , pp1v05_s0_cpu=0.8v

    Leave a comment:


  • dukefawks
    replied
    PPBUS? PP3V3_S5? CPU Vcore?

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  • arash
    replied
    SMC_RESET_L stay at 3.0V , SMC chip was also replaced, problem persists. Green light is present

    Leave a comment:

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