Macbook Air A1466 SMC_RESET_L

[Instafixx]

Hello Everyone,
Namaste!

I have a Macbook A1466 820-00165 . The board wont turn on. No signs of corrosion but the board had a lot of dust and saw. Cleaned it up properly. I would get Green/Orange Light randomly sometimes with a fan spin and the machine will power on normally and sometimes No Light, No Fan Spin and it wont turn on.

When there is no light and it wont turn on,

PPBUS_G3H is stuck at 8.17V.
PP3v42 is at 3.4V
SMC_RESET_L is at 3.1V.

When ahead and reballed the U5110. Post that it booted 3-4 times but then went back to being the same.

Any help in this regard will be of great help.

[paulyboy]

Re: Macbook Air A1466 SMC_RESET_L

Smc issue, pbus is 8.2v when there's no communication from smc

[mon2]

Re: Macbook Air A1466 SMC_RESET_L

Check the voltage to ground of the smbus SCL and SDA pins on the battery connector.

[Instafixx]

Re: Macbook Air A1466 SMC_RESET_L

Check the voltage to ground of the smbus SCL and SDA pins on the battery connector.

Machine is behaving erratic. Now i am getting light on the charger and no fan spin -Without Battery Installed.

PPBUS at 8.6V.
SDA and SCL Pins giving 3.4V.

The i connected the battery. At first it showed only green light and no fan spin. Then when i re conected the charger and the device now turned on normally.
SDA and SCL Pins giving 3.4V with Battery connected as well.

[mon2]

Re: Macbook Air A1466 SMC_RESET_L

Are you using the original and recommended power adapter?

Measure the voltage to ground of each pin on the dual diode that feeds the 3v42 regulator.

Test with only the power adapter, with only the battery and then with both.

Post each measurement.

[Instafixx]

Re: Macbook Air A1466 SMC_RESET_L

are you using the original and recommended power adapter?

Measure the voltage to ground of each pin on the dual diode that feeds the 3v42 regulator.

Test with only the power adapter, with only the battery and then with both.

Post each measurement.

device switches on properly now.

With only battery
d7005
pin 1 is 7.6v
pin2 is 0.05v
pin 3 is 6.9v

with only adapter

pin 1 is 8.6v
pin 2 is 14.9 v
pin 3 is 14.6 v

with adapter plus battery

pin 1 is 7.9v
pin 2 is 14.6v
pin 3 is 14.2v

[mon2]

Re: Macbook Air A1466 SMC_RESET_L

Voltage to ground of PM_BATLOW_L ?

[Instafixx]

Re: Macbook Air A1466 SMC_RESET_L

Voltage to ground of PM_BATLOW_L ?

BareBoard connected to adapter.

PM_BATLOW_L is 0V checked at R1410.

[mon2]

Re: Macbook Air A1466 SMC_RESET_L

If this signal is low, the logic board does not like the power adapter. Test it with a known good battery.

[Instafixx]

Re: Macbook Air A1466 SMC_RESET_L

If this signal is low, the logic board does not like the power adapter. Test it with a known good battery.

YOu mean just the board battery and adapter?

[mon2]

Re: Macbook Air A1466 SMC_RESET_L

Attach a battery like normal to see if it can power up the board. Or test with a known good adapter for this model. The signal notes it does not like your power adapter.

Need to fix my mother's AC. Blower motor not running. Could be the run capacitor on the motor. Garbage.

[Instafixx]

Re: Macbook Air A1466 SMC_RESET_L

Attach a battery like normal to see if it can power up the board. Or test with a known good adapter for this model. The signal notes it does not like your power adapter.

Need to fix my mother's AC. Blower motor not running. Could be the run capacitor on the motor. Garbage.

Hi Mon2,
Just an update. Removed the SMC. There was dust and debris there. Cleaned and it re - soldered it.

Machine working fine now.