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820-3208 - no fan spin

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  • 2informaticos
    replied
    Don't be afraid, I'm also middle age and work with one eye only...

    Leave a comment:


  • jpadie
    replied
    reflowing the SMC did not work by the way. I will debug a bit more later.

    Leave a comment:


  • jpadie
    replied
    ha. it is a plan ... but i am rather middle aged and have shaky hands!

    i may try with some old donor boards one weekend!

    Leave a comment:


  • 2informaticos
    replied
    I did many at hand; there are aprox 150 balls, not too many...
    0.35-0.4mm for commodity, but you can also use 0.3, even 0.45mm.

    Leave a comment:


  • jpadie
    replied
    ah. that is interesting. PPBus has always been 8.2v even when the board was in an S0 state. definitely something fishy.

    i will reflow the SMC later. I don't have any stencils here to do a proper reball of a donor.

    Leave a comment:


  • 2informaticos
    replied
    PPBUS_G3H correct value is aprox 8.4-8.5V.
    8.2V means SMC don't talk with ISL6259!
    And this be caused by SMC, or ISL6259, or something else connected on SMBattery Bus.
    As you also miss SMC_PM_G2_EN, SMC is first suspect here.
    The best option is change it. But I recommend to reball it first.

    Leave a comment:


  • jpadie
    replied
    why do you think that PPBUS is incorrect? It is 8.2v.

    SMC_RESET_L is high (as per message yesterday).

    yes. missing SMC_PM_G2_EN as per the same previous message.


    Leave a comment:


  • 2informaticos
    replied
    As expected, missing SMC_PM_G2_EN. It comes from SMC.
    You didn't mention incorrect PPBUS_G3H before...

    Check SMC_RESET_L value.
    Also try a reflow to SMC.

    Leave a comment:


  • jpadie
    replied
    U7201

    mostly at or close to 0mv except for
    3 80mv
    10 20mv
    16 800mv
    17 2.7v
    18 2.7
    22 3.3v
    23 8.2v
    24 2.7v
    25 2.7v
    26 2.47v

    U7941
    1 3.42v
    2 0
    3 0
    4 3.39v
    5 0
    6 2.7v
    7 0
    8 0

    Leave a comment:


  • 2informaticos
    replied
    Post basic voltages for U7201 and U7941.

    Leave a comment:


  • jpadie
    replied
    Yes - it's very odd. the voltage stays the same whether the coil is there or not. makes me very suspicious of U7201. but .... there is no enable inputer on U7201 either

    Leave a comment:


  • 2informaticos
    replied
    Mentioned signals appear much later...
    PCH should first release SLP_SUS and next SLP_Sx, after got PWRBTN reaction from SMC.

    "with L7260 removed there is 2.6+v at both pads"
    What???
    The coil is a part (important) of buck controller!!!
    Any voltage measure without coil is a non-sense...

    Change U7201 and Q7260; pay atention to R/C7264.

    Leave a comment:


  • jpadie
    replied
    also to note that there is no 3v on the middle pin of the magsafe.

    U2700 receives pp3v42_g3h. i cannot see any cap that is bad around U2700. there is no short on that rail.

    But ... i cannot see the logic that says that the PCH must start up just because U2700 is working. doesn't the PCH need all_sys_pwrgd AND (U2750) CPUIMVP_PGOOD AND (U2760) SMC_DELAYED_PWRG to start up?
    Last edited by jpadie; 12-02-2018, 03:59 PM.

    Leave a comment:


  • jpadie
    replied
    yes. with L7260 removed there is 2.6+v at both pads (which I find a bit odd and makes me suspicious of U7201)

    Interestingly R7260 and61 measure 11k and 7.8k respectievely . on a donor board they measure closer to 20 and 9k

    replaced the clock chip again. ppvrtc is at 2.3v now. PP3v3_s5 remains the same. I'm not getting a 32kHz signal on the clock chip though. starts at 16kHz and then spirals down to 8.

    Leave a comment:


  • 2informaticos
    replied
    PCH should work with 2.7V on VRTC.
    The suspect thing is if that voltage arrives to PCH as is, or is pulled down by PCH...

    Do you also have 2.7V at 3V3_S5 coil?
    If yes, check corresponding power supply.
    Pay atention to feedback resistors, R7260/61.

    Leave a comment:

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