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Old 08-05-2018, 08:35 AM   #1
technowiz
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Default MacBook Air 820-00165 PPBUS-G3H Short to ground

Hi. I am in need of some assistance. I am trying to track down a short in this board and I am having limited success. Fuse F7140 is blown and I have removed U5450, R5450 as well as fuse F7700 and the short disappears past these components but I am unable to locate it. The only thing I can think of is that it has an internal short within the board. Any help would be appreciated. Thanks
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Old 08-09-2018, 09:52 PM   #2
gmorb
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Default Re: MacBook Air 820-00165 PPBUS-G3H Short to ground

Insert voltage?
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Old 08-10-2018, 03:50 AM   #3
mawaqas
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Default Re: MacBook Air 820-00165 PPBUS-G3H Short to ground

did you find out what was causing it?
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Old 07-19-2020, 06:44 PM   #4
AtoZed
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Default Re: MacBook Air 820-00165 PPBUS-G3H Short to ground

Hey!
I have solved this type of issue once before on this exact board. Pin one side of F7140 was getting the 8.6v but the pin 2 side was shorted to ground. The fuse was blown as well. I didn't have the means to inject voltage so I replaced the fuse. Once I did that the pin 1 side of the fuse became shorted to ground as well. I then plugged in the magsafe and dripped alcohol all over the board to see if anything got super hot. This is when I found C7313 sizzlin'. After replacing it, I got fanspin and the board was fully functional. The short was gone. Hope this helps. There are a lot of capacitors on the G3H line that could be blown and shorting to ground.

This is my first post. I wanted to post regarding sourcing the F7140 fuse. I have another Air with a similar issue and don't have any fuses left on donor boards.
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Old 07-20-2020, 06:53 AM   #5
Neodim
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Default Re: MacBook Air 820-00165 PPBUS-G3H Short to ground

Quote:
Originally Posted by AtoZed View Post
...... dripped alcohol .....
good solution, sometimes I also use this technique
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Old 07-21-2020, 12:46 AM   #6
ktmmotocross
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Default Re: MacBook Air 820-00165 PPBUS-G3H Short to ground

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Originally Posted by Neodim View Post
good solution, sometimes I also use this technique
standard technique if u dont have thermocam
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