Apple Macbook Air A2337 not charging

[Blunttag]

Hi I am not sure if the issue is the battery or something else original the mac book air was not turning on, so i opened it up and removed the battery, the machine turned on without the battery connected so i order a replacement battery, installed it and now the laptop turns on with the cable connected and without the cable connected but it seem to be stuck at 22% with "battery is not charging" i have turned off battery optimized charging and am using the original apple 30W charger USB-C charger.

Does anyone have an idea what the issue could be?

[mon2]

Re: Apple Macbook Air A2337 not charging

30w sounds like a wimpy adapter but this is what was used before to power and charge this laptop?

Same usb c cable as before when it worked?

Usb c is able to support power delivery of different power contracts (volts and amps as a pair).

For the full support of power delivery, the usb c cable should be an Active cable featuring an e-marker chip in the cable head. If the e-marker is defective or missing, then only 5 volts will be used to power the laptop.

With an active working cable, then up to 20v @ 5A is possible if the source can support it and the load requests it.

Test with another usb c cable or use a usb c meter to confirm the voltage and current negotiated by the logic board.

What is the history of this unit? Just started with this fault recently?

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Laptop belongs to my cousin but yes i believe everything was working before and the same USB cable was used, and i tested with a different USB-C charger a HP 65W and the same thing happened plug in turns on but still say not charging and i believe the fault just occurred recently

[mon2]

Re: Apple Macbook Air A2337 not charging

Does the 22% value ever decrease as you run from only the battery?

Link or post the schematic for this logic board if on this forum.

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Yes it does decrease also here is the link to the schematic
https://www.badcaps.net/forum/showth...ighlight=a2337
But it won't open in openboardview

[mon2]

Re: Apple Macbook Air A2337 not charging

Measure the voltage of each pin of the battery connector J5150 while it is charging. Also while it is not charging.

Post each measurement.

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Ok measured at the battery connector terminal
plugged in
pin 1:11.29V
pin 2:11.29V
pin 3:3.26V
Pin 4:3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V

Battery only
pin 1:11.13V
pin 2:11.13V
pin 3:3.26V
Pin 4:3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V

Not sure if this make a difference but i also checked if there was a short on Pin 5 and there is a short to ground on pin 5 while laptop is off

[mon2]

Re: Apple Macbook Air A2337 not charging

Measure the voltage on each pin of the battery mosfet Q5625 for each case.

Source (1-2-3)
Gate (4)
Drain (5-6-7-8)

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Hi do you mean Q5265? as there does not appear to be a Q5625 mosfet

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Pin1,2,3 all connected :11.99V
Pin4: 12V
Pin5: 11.28V

[mon2]

Re: Apple Macbook Air A2337 not charging

Yes, my bad. Indeed Q5265.

What is the voltage of PPBUS_AON ?

For each of these tests, do attach the power adapter.

Update:

After the above, remove all power & no battery.

Meter in resistance mode.

Check the resistance across the same Q5265 mosfet:

Source (1-2-3) & drain (5-6-7-8)
Source (1-2-3) & gate (4)
Gate (4) & drain (5-6-7-8)

This mosfet is a P-channel mosfet so the gate (pin 4) voltage has to be lower than the voltage it is passing to turn ON.

What is not known yet is if the ISL9240 is enabling this mosfet or is this mosfet defective.

After the resistance check, we will know more.

[Blunttag]

Re: Apple Macbook Air A2337 not charging

PPBUS_AON:11.99V

Source (1-2-3) & drain (5-6-7-8) :100K Ohms
Source (1-2-3) & gate (4) : 15M Ohms
Gate (4) & drain (5-6-7-8) : 15M Ohms

[mon2]

Re: Apple Macbook Air A2337 not charging

Source (1-2-3) & drain (5-6-7-8) :100K Ohms

The source and drain resistance readings are considered low for mosfets.

If you are comfortable with it and have the tools and flux, remove this mosfet Q5265 off the board. Then perform the same measurements while the mosfet is on your table. Do allow the mosfet to cool down before checking the readings. Be patient in removing the mosfet with low air pressure so other parts do not go flying.

When this mosfet is off the board, attach the battery and adapter. Check if the gate pad pin on the pcb is with a different voltage than before.

Reference:
http://electronicsbeliever.com/how-t...0good%20MOSFET.

[mon2]

Re: Apple Macbook Air A2337 not charging

Another idea..

Disconnect the battery.

Attach the power adapter. What is the voltage on the battery connector? That is, does the voltage from the adapter appear on the battery connector?

[Blunttag]

Re: Apple Macbook Air A2337 not charging

With battery disconnected
Pin 1:11.99V
Pin 2:11.99V
Pin 3: 3.26V
Pin 4: 3.26V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V

don't have a USB-C power meter (ordered one waiting for arrival) so don't know what come from the adapter

[mon2]

Re: Apple Macbook Air A2337 not charging

Ok. What is the gate voltage on the mosfet from the last test?

No battery, only adapter.

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Gate voltage is 3.69V with battery disconnected

[mon2]

Re: Apple Macbook Air A2337 not charging

That is a good gate voltage to turn ON this P-channel mosfet.

If you have the tools, remove this mosfet and measure it's resistance when it is out of circuit.

[Blunttag]

Re: Apple Macbook Air A2337 not charging

Having difficult removing it what the max safe temp i can use?
Atm i'm at 400'c for 20sec and its not budging with flux also on it.

Tested on a Practice board and the SMD came off is the solder on Apple board require a high temp to remove?

Also rechecked Source (1-2-3) & drain (5-6-7-8) with a different Multi meter and getting 10M + Ohms

[mon2]

Re: Apple Macbook Air A2337 not charging

Hi.

1) wait on other feedback before proceeding if the resistance is higher on the source/drain pins.

2) concern is that when the battery is attached, this mosfet is OFF as the gate voltage is high.

3) yes, the mosfet may require higher heat. We use 550c on our Best 863 which is a clone of the Quick models but the true temp at the tip maybe a different value than 550C. That is, higher than 400C for sure. Lots of flux and keep rotating in a circle till melted.

However the resistance is ok with your other meter.

Wait on additional feedback.

Also suggest to use a higher power adapter and check the gate voltage again. Any brand is ok but 60w or more.

4) remove all power and check the resistance of the current feedback loop.

Check the resistance from CHGR_CSO_FILT_P to the current sense resistor.

Then CHGR_CSO_FILT_N to the same resistor.