Help needed: MacBook Air A1370 (820-3024)

[Joztu]

Hello, please I need help with a 11” Macbook Air A1370 820-3024 that doesn’t come on at all, has orange light on the charger

The fans spins and stops continuously with no sign of life

connected it to a power supply and noticed the power keeps fluctuating, draws ~ .500A and then goes down to about 0.074A

Pp3v43 is 3.3v

Don’t really know how else to proceed to solve the issue

[mon2]

Re: Help needed: MacBook Air A1370 (820-3024)

See attached.

1) be sure your power adapter is the original.

2) attach the power adapter.

3) measure the voltage to ground of each point of interest. Is each voltage stable?

Post your measurements.

[Joztu]

Re: Help needed: MacBook Air A1370 (820-3024)

See attached.

1) be sure your power adapter is the original.

2) attach the power adapter.

3) measure the voltage to ground of each point of interest. Is each voltage stable?

Post your measurements.

1: 8.39v
2: 19.20v when the fan spins, 18.8v when the fans stops spinning
3: 18.9v with fan spin, 18.6v when fan stops

Thanks for your reply

[mon2]

Re: Help needed: MacBook Air A1370 (820-3024)

Review the voltage to ground of PP3V42_G3H_REG @ L6995, pin # 2.

This rail should be 3v42.

If it is not, remove all power / no battery -> meter in resistance mode.

Measure the resistance to ground of this same test point @ L6995, pin # 2.

What are the measurements?

[Joztu]

Re: Help needed: MacBook Air A1370 (820-3024)

Review the voltage to ground of PP3V42_G3H_REG @ L6995, pin # 2.

This rail should be 3v42.

If it is not, remove all power / no battery -> meter in resistance mode.

Measure the resistance to ground of this same test point @ L6995, pin # 2.

What are the measurements?

L6995 pin #2 : 3.38v
Resistance to ground 316k