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Old 11-07-2019, 05:20 PM   #1
mferna14
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Default MacBook Air 1466 820-3437-B missing ALL_SYS_PWRGD

Hi all, working on a MacBook Air 1466 820-3437-B. It had liquid spill on the BIOS chip U6100, U1950 & corrosion on 2-3 passive components. I cleaned the board & replaced U1950 as some pins were rusted. After replacing I got all voltages except the ALL_SYS_PWRGD voltage & got a fan spin but no display/image. Since the spill was near the BIOS chip I replaced that too & got all voltages & display was perfect, kept it on for a very long time. Upon re-assembly I turned unit on but ALL_SYS_PWRGD is missing again. I get all the voltage, 3.3, 5V & 1.5 volts but no CPUVR volts & no volts on L7310/L7320. Does anyone tell me what am I missing yet to be checked. Thank you
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Old 11-08-2019, 03:14 AM   #2
piernov
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Default Re: MacBook Air 1466 820-3437-B missing ALL_SYS_PWRGD

If ALL_SYS_PWRGD is missing, usually it means another S0 rail is missing as well. (excluding CPU VCore which requires ALL_SYS_PWRGD to turn on)
Check the list of power rails again.
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