Hello, I have a MacBook Air that got some liquid! It worked again, but now it won't load or start with the power adapter! As long as the battery is still charged, the MacBook works normally on battery! But not with a power supply. There is also no green or orange light at the plug! Not even with another Magsafe. Even a new DC power board does not work. It's probably the logic board! Need help. Thanks
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Re: MacBook Air A1466 2017 no Power via MagSafe
Post the full 820-xxxx # on the logic board to reference the proper schematic.
Probably 82-00165 ?
See attached.
Remove the battery - attach only the known good Apple original power adapter.
Measure and post the voltage readings on D7005.Attached FilesLast edited by mon2; 03-16-2022, 10:08 AM. -
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Re: MacBook Air A1466 2017 no Power via MagSafe
820-00165-aComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
great, I just started measuring the D7005! there is nothing on pin 1,2,3! At pin 1 only 0.0010V.
And with my healthy board there is 16V.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
That was expected.
See attached. Measure & post the voltages for the referenced points with your magsafe adapter connected.Attached FilesComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
I have R7010 Pin1= 3,13Volts
R7011+R7010 Pin2=3,10 Volts
Q7010= 0VoltsComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
PPDCIN_G3H is not the proper value @ 3v13.
Reference:
https://www.logi.wiki/index.php/Powe...List#820-00165
It should be PPDCIN_G3H = 18v5.
Can you test with the other power adapter ?Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
at J7000 Pin 1 and pin 2 I have 3,14Volts too.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
other Magsafe same!! VoltsComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
other board (tats OK!!) I have PPDCIN Q7010= 16,4Volts R7010 pin 1=16,4 Volts, R7011 pin2 =6,7VoltsComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
1) confirm the DCIN magsafe board does not have any burnt contacts with your external adapter. Use alcohol to clean the contacts.
2) after the above check, take the bridge cable from the working unit off and apply the bridge cable from this non-working unit (DCIN board to the main board) on the known good A1466.
Do you see the proper PPDCIN_G3H voltage on the known good A1466 ?
Be sure to swap the cables only with power removed from the logic boards!!Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
The good A1466 has 16,4Volts! The Magsafe is 100%ok.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
Is this using the non-working board's bridge cable ?The good A1466 has 16,4Volts! The Magsafe is 100%ok.
Now transfer over the daughter board (LIO) onto the non-working board & use the same tested bridge cable.
Then test again with the known working Magsafe adapter.
Post the voltage readings for PPDCIN_G3H.Attached FilesComment
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Re: MacBook Air A1466 2017 no Power via MagSafe
I did this. I have both logic boards here and tested them with the intact DC board.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
Any difference in the voltage on D7005 with the swapped LIO board & mating cable ?Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
Check R7012 voltage with no magsafe attached; should be close to 0V. If not, usually leaky Q7180 after liquid damage.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
The DC Board and the bridge cable are 100% ok. and the other 820-00165 A1466 logic board is 100% ok.
i haveR7010 Pin1= 3,13Volts
R7011+R7010 Pin2=3,10 Volts
Q7010= 0Volts
and at J7000 Pin 1 and pin 2 I have 3,14Volts too.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
So a part on the logic board is defective! I had already exchanged the D7005 after the damage, after that the MacBook worked. But it hasn't been loading for 4 days. No light on Magsafe connector. And as I said, the voltages that I measured.Comment
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Re: MacBook Air A1466 2017 no Power via MagSafe
D7012 SDZT15R6.8. damage?Comment
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I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
- PPBUS_G3H (12.6V-12.8V)
- This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
- PP3V42_G3H (3.42V)
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- PPVRTC_G3H (3.3V)
- This
- PPBUS_G3H (12.6V-12.8V)
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