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820-3437 fan going nuts

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  • 2informaticos
    replied
    Fan will go high if trackpad is not connected.
    Palm rest temperature sensor is not detected.
    Run ASD again, if needed...

    Leave a comment:


  • gadgetfix
    replied
    still spinning up. after boot

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  • gadgetfix
    replied
    ok got booting again everything is good. replaced isl and resistors that were blown. good news is the u5110 has pp3v42_g3h coming in now and also its shooting out 3.3v from pin 8
    i will wash and retest board in machine? is it normal that out side machine board only with charger only and NOTHING connected - the fans run 100%?

    Leave a comment:


  • gadgetfix
    replied
    i change u7100 again same issue resistors burnt
    how to check q7130? just see if short?

    Leave a comment:


  • 2informaticos
    replied
    Why didn't think you why R7105 got burnt???
    I bet U7100 is fried.
    Check C7105, just in case.
    Also check Q7130 before power up the board again.

    Leave a comment:


  • gadgetfix
    replied
    i got 3.4v on ppbus now? I also notice R7122/R7121 is both dead and there is big hole in R7105 i replace and it burnt again!?
    Last edited by gadgetfix; 12-12-2018, 01:10 AM.

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  • gadgetfix
    replied
    now voltages are present on u5110 but no fan spin no boot. i was probing around on u7100. i might of accidentally bridged pin 12-11? could this be the cause?

    Leave a comment:


  • 2informaticos
    replied
    Check U5110 voltages.
    AVREF is required for A/D converters from SMC.
    If no present, all sensors cannot be properly read...

    Leave a comment:


  • gadgetfix
    replied
    its not there. this is s5 line? so even with charger it should be readable?

    Leave a comment:


  • 2informaticos
    replied
    Check PP3V3_S5_AVREF_SMC presence first.

    Leave a comment:


  • gadgetfix
    replied
    ok ran asd and got many errors.

    SMC 0x0 -- smc critical sensor
    Temperature (THSP) -- Thunderbolt Proximity (test #1)
    Temperature (TM0P) -- MLB top side
    Temperature (TW0P) -- Airport proximity
    Temperature (Tm0P) -- Memory proximity

    Leave a comment:


  • gadgetfix
    replied
    I ran techtools PRO but no sensor errors, i really want to get to the bottom of this so i will get hwmonitor and run that too.

    thanks

    Leave a comment:


  • JohnB8812
    replied
    Hmmm this is a weird one. Try with just a known good trackpad and I/O board and cable plugged in. Let it boot all the way up with an SSD. If it’s still doing it, there surely must be a sensor that is reading wrong. Try booting into the OS and running HWMonitor on it to see if any sensors are reporting high

    Leave a comment:


  • gadgetfix
    replied
    reflowed smc still spinning hard

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  • gadgetfix
    replied
    thanks for all your valuable input. i can easily get things off the board at 350c, i use hakko fr-810b. I am just suprised there could be crap under smc as this has no previous history of water? but who knows?

    i checked out the mlink 853a, that is very cheap! I have been looking at using preheater I really want something thinner but price goes $$$$$

    Leave a comment:

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