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Macbook Air 2014 (820-3437-B) liquid damage help (Repaired)
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Topic: Macbook Air 2014 (820-3437-B) liquid damage help (Repaired) (Read 898 times)
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poot36
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Macbook Air 2014 (820-3437-B) liquid damage help (Repaired)
«
on:
October 13, 2020, 02:37:47 am »
I have a Macbook Air that I got in for repair that has had coffee spilled on it and no longer turns on. The charger light will change from green to orange and I can do a SMC reset with the keyboard combo and the light changes to indicate a reset. I have taken it apart and cleaned all the visible liquid damage off with a brush and then warm soapy water in a ultrasonic bath. It made no difference. I have confirmed that I am getting all the G3 Hot rails and that they are in spec. The PP1V2_S3 rail and the PP1V05_S0 briefly turn on when the charger is plugged in and the battery is disconnected (the battery is dead as the client left it in a closet for 1 year after the spill) and then turn off. When they do come up they are at the correct voltage (checked with a scope). What would be the next thing to start measuring?
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Last Edit: May 28, 2021, 02:06:53 am by poot36
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coromonadalix
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #1 on:
October 13, 2020, 02:58:51 am »
a complete visual inspection would be good, not just measuring stuff, you may have corroded parts or ic's etc ...
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tooki
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #2 on:
October 13, 2020, 08:41:25 am »
Left for a year after the spill? RUN. Coffee is acidic, and after a year, part of which was with residual battery power present, there is guaranteed to be corrosion damage.
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poot36
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #3 on:
October 14, 2020, 12:24:06 am »
I have given it a quick visual inspection and there are some laces that look questionable but test fine. I will have to clean the brown rust like substance off the inductors though.
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tooki
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #4 on:
October 14, 2020, 12:30:57 am »
A “quick” visual inspection isn’t going to show you the problem areas, which are where capillary action kept them wet longer, like under chips.
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poot36
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #5 on:
October 14, 2020, 02:55:26 am »
I have ordered one of the cheap usb microscopes so hopefully it will get here by the end of this month. I am a bit concerned because I did have some corrosion around the CPU vrm and the side of the CPU that has the PCH on it. Will take a closer look when I get the microscope.
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poot36
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Re: Macbook Air 2014 (820-3437-B) liquid damage help
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Reply #6 on:
May 28, 2021, 02:06:37 am »
I got it working after a good cleaning with hot soapy water in an ultrasonic cleaner. Thanks for the help.
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