Starts once after battery removed, then when powered off won't start no more
Keyboard works, no liquid damage seen, power on pads also not working
Keyboard works, no liquid damage seen, power on pads also not working
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Last edited by Dinneke; 11-07-2022, 09:46 AM. -
Re: Macbook Air A1466
Are you using the official power adapter ?
Do you see the green / orange light on the adapter ?
Does the unit function with only the adapter ? (no battery) -
Re: Macbook Air A1466
Adapter/charger original
Shows green/red
Battery removed it turns on instantly as supposedComment
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Re: Macbook Air A1466
What is the 820-xxxx board # ?Comment
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Re: Macbook Air A1466
820-00165-aComment
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Re: Macbook Air A1466
See attached. Remove all power / no battery.
Meter in resistance mode.
Check the resistance across the battery mosfet @ Q7155.
source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8)
Post each measurement. If the meter shows '1' or 'OL' -> then switch to a higher meter scale to take a measurement.
If the resistance is too low, the mosfet is likely to be defective and must be replaced.Attached FilesComment
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Re: Macbook Air A1466
source (1-2-3) & drain (5-6-7-8) 105k
source (1-2-3) & gate (4) > 500k
gate (4) & drain (5-6-7-8) > 600kComment
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Re: Macbook Air A1466
With the battery removed and using only the external power adapter, what are the voltage readings of this battery mosfet ?
Pins:
Source (1-2-3)
Gate (4)
Drain (5-6-7-8)Comment
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Re: Macbook Air A1466
Power button on the keyboard is usually the culprit; this is seperate to the rest of the keyboard and not muxed by the trackpad. With no power applied, check pin 20 on J4800 for a short to ground when power button is pressed.
SMC_ON/OFF_L is pulled high by R5170 to 3.42V, power button shorts this line low.Comment
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Re: Macbook Air A1466
Solved!
Thanks all
It was a strange high leak on TouchPad, SCL related.Last edited by Dinneke; 11-08-2022, 04:26 AM.Comment
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Hi. Recently serviced a damaged A1466 Macbook Air. Thought to post the issues and resolution for each.
Macbook AIR Model A1466 Diagnostic 09-01-2021
Issue: Liquid damaged (beer spill) Macbook AIR will not power up.
Problems & Resolutions
1) Attached Apple magsafe power adapter. No green / no orange light. This confirms the absence of the PP3V42_G3H voltage rail. The PP3V42_G3H rail is the primary voltage rail necessary to communicate with the magsafe power adapter to report the green or orange light status to the end user....09-01-2021, 09:31 AM -
Hi all,
i got a A1466 logic board for spare parts but it looks like the SMC ist bad. I got several spares but somehow i was too fast while removing it and ripped some pads off. You can see the damage attached.
Just for experience i would like to restore the lost pads but before i start (haven't done this before) do you have some hints or tutorials how to do it?
As written i want to improve skills so it doesnt matter if it takes longer. -
Hi everyone.
Macbook Air A1466 EMC 3178 (board 820-00165 A) not turning on and no charging light. Completely dead. With no battery connected it would power up and I could hear the chime, but nothing on the screen and then a sudden turn off. Sometimes during the chime. Opened it up and found some liquid damage. The flat that connects both boards has damage in one side (with a missing pin already). The connectors on the boards are fine, though.
Also, there was liquid damage on the included picture area, which are R8111 and C8111. A quick and soft brush on it made the resistor be gone....04-15-2024, 01:24 PM -
I got a tricky one today in the form of a macbook air A1466 820-00165-A that will recognize the charger and turn the light green then back to orange and the fan will spin constantly, but the system won't power on. The screen never turns on, it doesn't make the bong noise it's supposed to, and pressing the power button doesn't do anything. When I took the board out to visibly inspect it I only found one spot of corrosion on the bios IC. I pulled the chip, cleaned it and the area with IPA and put fresh solder on both and put the bios chip back on, but when I went to test it again it still does the...
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Hello guys, i have an Macbook Air A1466 Emc 3178, board number 820-00165-A and i encountered following problems. At first no light, no power..after opening and cleaning the LCD socket(Red dot under LCD plug and also Orange dot near wifi card)..got light on charger, fan working and chime...Tried several times and working, then short time after dead...next day work again for short time...after removing the board and cleaning the back(rust on components) with alcohol and soft brush, one of the resistor is gone and no power ..I want to change 5 (buy from China) of them (1 missing and 4 bot looking...
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