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    820-3787-A shutting down

    Received a Late 2013 Retina Macbook Pro 15 inch today. It's randomly shutting down which I have replicated. I've read around and i'm seeing U7310 listed as a common failure point on these boards. The only issue i've got then (assuming correct diagnosis) is that I cannot find the recommended...
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    820-00875A Pulsing S5 rails

    tried this and unfortunately the behavior is the same. Any further ideas on this problem?
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    820-00875A Pulsing S5 rails

    Do you have a link to a known working clean ME BIOS for this board?
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    820-00875A Pulsing S5 rails

    Unfortunately I can't as it's completely broken the windows install now.
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    820-00875A Pulsing S5 rails

    I believe it was the Intel SYSTEM driver as listed on windows update,
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    820-00875A Pulsing S5 rails

    Finished the windows install - works fine until drivers there - once windows update has run and installed drivers the machine again will freeze then shut off - just like it does after loading mac os. I've been over the board carefully under the microscope and can see nothing else visible
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    820-00875A Pulsing S5 rails

    Ok i've tried a Windows 10 install USB - which boots fine and will sit on the welcome to windows screen for an hour no issue, no freezing no shutting down. Mac OS safe mode is also behaving the same as it does in normal mode = boots then shuts down shortly after hitting the login screen. Is this...
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    820-00875A Pulsing S5 rails

    ok right i've gone through all the S5 rail feedback resistors and found R7910 was dead - have replaced and now board powers up. So that's one issue resolved. Now issue #2 is the board works fine on the choose a boot device screen (option) but when I boot it up to either the customers SSD or my...
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    820-00875A Pulsing S5 rails

    no pulses at PM_SLP_S4/3_L, no pulses on any S3 or S0 voltages either when triggering SMC_ON_OFF_L. I'll check Page 64 again but I didn't see any shorts before.
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    820-00875A Pulsing S5 rails

    Do not currently have a scope unfortunately - am checking rails with a Fluke meter. Yes board is being tested alone on desk without anything else attached other than a 85W Type C Charger.
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    820-00875A Pulsing S5 rails

    Another liquid damaged macbook in today this one 820-00875A. Was a lot of liquid damage focussed around keyboard connector. Keyboard connector was burned and has been replaced. Board has been Ultrasonic'd for 4 minutes. The issue is the machine won't start, the S5 3.3V and 5V rails just pulse...
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    820-00840-a Wont start missing PP5V_S5

    Well i've pulled the PMIC and i've still got a 5ohm short to ground on 3v1_RTC. PCH i'm guessing?
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    820-00840-a Wont start missing PP5V_S5

    3v1_RTC is 0.023V so i'd say not there! PMIC issue then?
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    820-00840-a Wont start missing PP5V_S5

    SMC_PM_G2_EN is high 3.4V BUF_SMC_RESET_L is high 3.4v PP1V2_S5_SMC_VDD - 1.2v PP3V3_S5_SMC_VDD - 3.4v also of note but probably not important right now L6600 and L6601 are missing. They appear to be just for audio so i'm not too concerned about them right now!
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    820-00840-a Wont start missing PP5V_S5

    R7828 is the one present, R7829 is not
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    820-00840-a Wont start missing PP5V_S5

    PMIC_EN_P3V3S5 is missing 0v PMIC_SHUTDOWN_L at R7828 is 3.17v.
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    820-00840-a Wont start missing PP5V_S5

    sure PP5V_LDO5V - 4.93V (at c8035) PP3V3_LDO3V - 3.217V (at c7805)
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    820-00840-a Wont start missing PP5V_S5

    diode mode reading is 0.455 to ground on pp5v_s5 pin 23 -13.06v pin 12 - 0v pin 13 - 0v pin 22 - 3.3v pin 29 - 0v pin 21 - 0v pin 4 - 0v
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    820-00840-a Wont start missing PP5V_S5

    so i've received a liquid damaged 820-00840-a in today. Liquid damage was focussed around the U7650 area. I've cleaned it all and visibly inspected the area - resoldered U7650 as pins 31 and 26 were not shiny anymore. If I connect charger it negotiates to 20v as expected but with a tiny spike...
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    820-4924-A No Green Light/Charge With Original Charger

    Yeah you were 100% correct it was Q7180 - tried D7010 first was same then replaced Q7180 and it's working now. First time i've had to replace it to be honest!
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