Strange Battery Problem on A1466 820-00165

[Mufasa]

Hello Everyone,
I have a 2017 MacBook Air A1466 that will not charge the battery but will run off the battery outside of MacOS. If the charger is removed while in MacOS the screen immediately goes dark, but the fan will spin for another 30-45 seconds before turning off. I replaced Q7155, R7151 and R7152 but the issue remains.
Ideas?

Thanks in advance

[mon2]

Re: Strange Battery Problem on A1466 820-00165

Try a pram / SMC reset.

How old is the battery? Test with a known good battery.

[reformatt]

Re: Strange Battery Problem on A1466 820-00165

Known good battery first, then check in MAC OS;

About this Mac, System Report, Hardware, Power. What info is reported for the battery? Cycles, charge current, etc?

[Mufasa]

Re: Strange Battery Problem on A1466 820-00165

I've tried 3 known good batteries with 315 cycles or less. All do the same thing. I usually reset the PRAM twice and reset the SMC once when doing any battery replacements or motherboard work.

[mon2]

Re: Strange Battery Problem on A1466 820-00165

Measure the voltage to ground of each pin on the battery connector.

Post the measurements and pin numbers.

[Mufasa]

Re: Strange Battery Problem on A1466 820-00165

Pin 1 8.42
Pin 2 8.42
Pin 3 8.42
Pin 4 2.54
Pin 5 0
Pin 6 227.3
Pin 7 0
Pin 8 0
Pin 9 0

[mon2]

Re: Strange Battery Problem on A1466 820-00165

Pin #6 cannot be right. Can you confirm the right value?

Also, confirm again the voltage to ground of pins #4 and #5 of the battery connector.

These must be ~3v42 for each.

Measure the voltage to ground on each side of R5380.

Then also R5381.

[Mufasa]

Re: Strange Battery Problem on A1466 820-00165

Pin 4 2.54
Pin 5 3.42
pin 6 ??? still getting wacky result

R5380 both sides 14.62
R5381 14.62 and 0

[mon2]

Re: Strange Battery Problem on A1466 820-00165

As per post #3, do you see the correct information about the battery? If you swap in a different battery, does the report change?

We are checking to see if the smbus lines on the battery pack are working correctly or not.

If the battery reporting is ok then the smbus lines are not the fault as they are used to extract this report.