MacBook Pro 14" M1 Pro Battery related question.

[Stephen]

Board was just repaired, great thing for us since the DATA was recovered, however the battery was just replaced with a brand new OEM battery and holds the charge well, I plug it in and the charge icon comes on (lightning bolt) then it goes off and comes back again and repeats itself, The MagSafe 3 Amber light is turning off and on constantly, which is telling me something else is going on, before I pull this board out again I was wondering if anyone has come across this issue since its a little new to me on this model. Battery is holding the charge well at 52% but it won't charge further, I checked the status and it is in NORMAL operation, the board was dead and there was a few shorted caps and those were replaced, when I try USB C charging it does the same thing as well, but all peripherals are recognized and the computer stays on without issue, now I am assuming this is still a board related issue, but maybe its not? Possibly a faulty battery? She said her battery wouldn't charge before so we replaced it and of course the battery turns on and charges temporarily, but now it's not charging at all except in increments. Any ideas of this? Anyone had this experience before? Thank you in advance.

[Stephen]

Be sure that one meter probe is on C5221 and the other probe on C5222 = total resistance = ~2 ohms. Not measuring to ground.

Something is wrong here. Likely a broken PCB trace or missing part in the path.

Trace from C5221 and go north and continue to make a clockwise batch of measurements. Compare each to the schematic. The full path should have been ~2 ohms.

Looked harder and these two resistors were both at 10 ohms, I checked my donor and I had the exact two at 1 ohms removed them tested and they were good, removed the other two and they were bad. Replaced and now that Line is at 1 ohm on both. Testing the board out now.

[Stephen]

I think I may have found the area in question I will update with my findings for anyone that needs a reference to this type of repair.

[Stephen]

So I am not correct, removed the new battery as it was not charging, I installed customers old battery and it has a charge still so looks like that battery is fine, I see that the MAGSAFE charging cable keeps blinking orange to off and on back to orange, I tried a DFU revive and the computer won't revive, so tried DFU Restore and that would not work either. I have backed up her data prior to this just in case this would happen so we are ok for now, I was able to repair the blown area in question which was PPDCIN_AON_CHGR_R which had two blown caps and I replaced those and the short was removed and the computer booted again and held the batteries charge, Charging icon would come on but then it would stop and start blinking. I was like well that's weird, is this a faulty battery or a something else? Now what looks weird is her previous battery is charging so I am going to charge it up and see if it is not letting me DFU because the battery is to low, the orange amber light its staying on while its off which is weird. I thought just maybe this was the issue but I guess not at this time. I will update with my findings or may need some guidance. Going to go back to another repair while I figure this out.


Here is the ERROR message from AC2

Failed to restore device in recovery mode, libusbrestore error:2006 [com.apple.MobileDevice.MobileRestore – 0x7D6 (2006)]

[mon2]

Test again but use a different USB cable for the DFU.

[Stephen]

Test again but use a different USB cable for the DFU.

Swapped with a different USB C cable, and that didn't work either HOWEVER the error message is different

Failed to restore device in recovery mode, libusbrestore error:2015 [com.apple.MobileDevice.MobileRestore – 0x7DF (2015)]

[Stephen]

OMG! I LOVE YOU mon2 I decided to use a Thunderbolt 3 cable and it finally restored, however I decided to download the IPSW from MrMacintosh website and used 14.5 IPSW and VOILA! I am so glad I backed up the DATA and it's a Time Machine so easy peasy! Let's hope the battery holds a charge this time!

[Stephen]

Ok so the battery is charging but it keeps trickle charging, the amber light is turning itself off and on, over an over again. So the issue does persist even with her older battery, however her battery is charging now but trickle charging, which is not consistent. But yet her battery is charging and continues to charge. I do not know what the cause of this may be but her computer is functioning normally, I am assuming there is some board related issue still since both batteries showed the same symptom, yet I repaired the area in question that was part of the charging.

I do want to add, I tried charging with a USB C cable and it will not charge at all whatsoever, could this be a symptom we know about? It won't even recognize the USB C cable for charging, however it does recognize devices like external SSD drives or peripherals just not charging.

USB C Meter reading is giving me 20Volts 0.00Amps

[Stephen]

So the battery charged to 100% and it stopped charging and the green light is staying on, HOWEVER the USB C cable does not let me charge the computer at all or give off any AMPS for the USB C METER. The USB C port does work for peripherals though but the battery charges slowly with the trickle charge but I am certain this is not normal operation since it won't charge with the USB C ports. Any suggestions? I was able to successfully install SONOMA and get her DATA backed up and ready to migrate but need an idea of what this may be? Any experience with this? pulled the board out and tested without battery and I am getting 5volts 0Amps
Tested voltage on PPBUS_AON and I am getting less than 1 volt on PPBUS_AON. When I unplug the charger and plug it back up and test immediately I get 5 Volts on PPBUS_AON and it starts dropping fast to less than 1 volt. it stays steady at .5volts I removed the two Fuses to test for shorts and they are not present. So there is no short on that line, yet PPBUS_AON is dropping.

[Stephen]

Any thoughts what this could be? I looked for shorts and nothing is coming up.

[mon2]

The laptop functions and boots ok with a charged battery? Are the battery details available at the desktop?

The adapter at 0A means there is a power path fault.

[Stephen]

The laptop functions and boots ok with a charged battery? Are the battery details available at the desktop?

The adapter at 0A means there is a power path fault.

Yes the laptop functional normally and boots ok with charged battery. The battery details are in NORMAL operation and has 85% life. 225+ cycles, so that battery is good. I see so 0A means power path fault. What is weird is that PPBUS_AON gets 5volts and drops continuously and hits less than 2volts with no power. It blows my mind. MagSafe 3 charger works and turns the light on and charges the battery but it trickle charges it meaning it turns itself on and off with the charge. But it does charge the battery but it is not 100%

[mon2]

What is the 820-**** number of your board?

[Stephen]

What is the 820-**** number of your board?

820-02098-07

[mon2]

Remove all power. What is the resistance to ground of PPBUS_AON @ Q5230 (pins 1-2-3-13)?

When you attach the power adapter, what is the voltage to ground at the same point? Is this voltage stable?

[Stephen]

Do you mean PPDCIN_AON_CHGR_R?
Do you think I should remove Q5230 and get those readings?
Before removing. I am getting 24K OHMS on all areas in question on PPBUS_AON

When power is on, I am getting steady 5Volts (5.17volts) on all three lines, Q5230 pin 13 is underneath so cannot reach that but I can remove it and test?

[mon2]

No need. Pins 1-2-3-13 are internally mated so the voltage will be the same. No short here since the voltage is stable and resistance is high.

Remove all power. Meter in resistance mode. What is the resistance between C5221 and C5222? This is the current sense path of the input rail that feeds into U7000. You should have ~2 ohms here.

[Stephen]

C5221 and C5222 is 24k OHMS.

[mon2]

Be sure that one meter probe is on C5221 and the other probe on C5222 = total resistance = ~2 ohms. Not measuring to ground.

Something is wrong here. Likely a broken PCB trace or missing part in the path.

Trace from C5221 and go north and continue to make a clockwise batch of measurements. Compare each to the schematic. The full path should have been ~2 ohms.

[Stephen]

sorry I read that wrong, I am getting 2 OHMS across both CAPS.

[mon2]

What is the voltage to ground of L5230 (either side) with the power adapter?

The mosfets linked to U7000 are suspects. Using surrounding parts for probing, you can check the resistance of these mosfets.

Remove all power. Meter in resistance mode.

Measure:

source / drain
source / gate
gate / drain

Review the schematic and probe using other parts that mate with the pins of interest. Each measurement must be hundreds of k ohms or higher else the mosfet may be defective.