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    820-00165 - No Boot U7100 hot

    Hello I have a macbook air U7100 is hot, drawing a total of 39ma. I have replaced U7100, what would be a good next step for troubleshooting? PP5V1 CHGR VDD 5v PP5V1 CHGR VDDP 5v CHGR DCIN 17.9v CHGR_BGATE 1.2v CHGR_UGATE 8.77v CHGR VCOMP R .78v PPDCIN G3H CHGR 17.85v ____ F7140 Pin1 8v...
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    820-4924

    Hello Board looks to be in good condition. Customer described as having trouble starting machine this week, now doesn't start at all. What we get... =PPBUS_G3H 12.5v =PP3V42 G3H REG 3.42v =PP3V3_S5_REG 3.3v =PP5V S4 0v =PP5V_S3 0v =P5VS4_EN 0v = PM SLP S5 L 0v = S5 PwrGd 3.3v =...
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    820-00165 On (I think?) But no display

    Hello No caps lock or other signs of working. I did get it to display the apple folder icon once but not seen that again. Installed a known good test SSD which gets very hot.
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    apology for downtime

    Friends First, Computers Later.
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    820-00165 On (I think?) But no display

    Hello Macbook Air - replaced screen and tested backlight works OK When I power on after disconnecting battery the "Bong" sound goes repeatedly, untill I restart once, then it will "turn on" normally but with no display. Nothing on the display best I can tell, even with torch in the background...
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    820-00165-A Quarter Fan Spin

    Sorry, I don't do that many board repairs. Maybe 20 a year. I have tried SMC in bypass mode with no change. i.e. I still get the power pulse and no fan spin. I will give up on this board for now. Thank you for the help.
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    820-00165-A Quarter Fan Spin

    Hello Thank you for your help so far but I am not understanding. What do you mean by SMC mode? Do You want me to check the coils again in that mode? How do I Trigger SMC_ONOFF_L ? Kind regards James
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    820-00165-A Quarter Fan Spin

    Hello In SMC bypass mode the board does the 3 second thing. (Just checking, hold down power, plug in magsafe, hold power button for 10 seconds, release) Fan immediately spins but ony for a second. I'm not 100% sure what you mena by " all big coils; especially PCH/CPU. " but this is what I've...
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    820-00165-A Quarter Fan Spin

    I get 0v on PLT_RESET_L
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    820-00165-A Quarter Fan Spin

    So to clarify With no battery connected, computer will try to boot, drawing about .185a then restart approx every 3 seconds. the fan does not move.
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    820-00165-A Quarter Fan Spin

    Hello No power supply connected with Diode Mode. "With no battery connected no boot / fan spin." - With no battery connected, the laptop does not do quarter fan spin, or boot in any way. Computer was "fine" before customer brought it in.
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    820-00165-A Quarter Fan Spin

    Voltages SCL - 2.9 - 3.4 (fluctuates) SDA - ditto with battery and PSU connected. SCL 0.477 SDA - 0.457
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    820-00165-A Quarter Fan Spin

    "PPBUS G3H 8.57 with no battery, 8.38 with battery 3 V3_SUS 3.29v with and without battery is battery bus U7100 ?
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    820-00165-A Quarter Fan Spin

    Hi Quarter fan spin when battery connected. With no battery connected no boot / fan spin. PPBUS G3H 8.2v PP3V42 G3H 3.4 PP5V S5 5v PP3V3 3.3v I replaced capacitors C1992 and C1902 as they looked damanged Thanks in advance. James
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    820-00165a- no boot 0.37 ma draw (doing nothing)

    Any advice on how I do this exactly? Is there a video of somebody doing that ?
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    820-00165a- no boot 0.37 ma draw (doing nothing)

    3V3_SUS is 3,3v PP3V3 S4 300mv with power applied PP3V3 S4 diode mode (red on ground, black on chip) .330
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    820-00165a- no boot 0.37 ma draw (doing nothing)

    Sorry, 300mv. Will check the other readings tomorrow.
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    820-00165a- no boot 0.37 ma draw (doing nothing)

    Hi All Liquid damaged board. I don't fix boards often so some general advice would be good too. u7100 is a little hot at about 23 degrees (thermal cam) There was liquid damage around u7200 and U1930, and u1845 PPBUS G3H present and correct PP3V42 G3H present and correct PP3V3 S5 present and...
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    820-00138 boots but runs slow, fans 100%

    Hi Macbook Pro boots OK able to log in etc. keyboard and trackpad appear to be functioning OK. Apple diagnostics says may be issue with SMC (vague I know) All temps shown via MacFanControl are OK. So, how would I go about narrowing down the issue to find what sensor or fault is with this mac?
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