[B]Correction:[/B]
[B]R5380 is NOT 10KΩ[/B] – It is [B]2.0KΩ[/B] (confirmed from the schematic).

The overall test method is still [B]valid[/B], but the [B]resistor value must be corrected[/B] to [B]2KΩ instead of 10KΩ[/B] to match the real circuit design.
​[B]Correction:[/B]
[B]R5380 is NOT 10KΩ[/B] – It is [B]2.0KΩ[/B] (confirmed from the schematic).

The overall test method is still [B]valid[/B], but the [B]resistor value must be corrected[/B] to [B]2KΩ instead of 10KΩ[/B] to match the real circuit design.
​[B]Correction:[/B]
[B]R5380 is

[B][B]Data Analysis & Test Point Isolation – MacBook A1502 (820-3476-A) Battery Won't Charge After Full Discharge[/B][/B]


This guide will use [B]data-driven testing[/B] and [B]precise test point measurements[/B] to isolate the [B]root cause[/B] of the issue. [HR][/HR] [B][B] Problem Breakdown & Failure Mode Analysis[/B][/B]
[TABLE]
[TR]
[/TR]
[TR]
[TD][B]Battery charges after manual reconnection[/B][/TD]
[TD]SMC detects battery, U7000 enables charging[/TD]
[TD][B]SMBus failure, battery low protection...

[B][B] MacBook A1502 (820-3476-A) Battery & Charging Issue[/B][/B][LIST][*][B]PM_BATLOW_L = 3.34V with charger, no battery[/B] → [B]Normal behavior[/B] (since it's pulled up to 3.42V).[*][B]PPBUS_G3H is too low (~10-11V with charger, 12.65V without battery)[/B] → [B]Charging circuit issue[/B].[*][B]Battery does not charge when completely discharged[/B].[/LIST][HR][/HR] [B][B]Step-by-Step Deep Diagnosis[/B][/B]

[B][B]Step 1: Check Charger & Adapter Sense Circuit (ADAPTER_SENSE)[/B][/B][LIST][*][B]You measured ADAPTER_SENSE = 2.8V[/B].[*]Normal range should be [B]around...

[B][B]Advanced Troubleshooting for PPBUS_G3H Voltage Drop on MacBook A1502 (820-3476-A)[/B][/B]


Since you're [B]getting only 10.11V on PPBUS_G3H with the battery connected,[/B] but a normal [B]12.65V with the battery disconnected.[/B] [HR][/HR] [B][B]Step 1: Identify the Main Issue[/B][/B]
[TABLE]
[TR]
[/TR]
[TR]
[TD][B]Battery disconnected, charger connected[/B][/TD]
[TD][B]12.65V (Normal)[/B][/TD]
[TD]Charging circuit (U7000, Q7130) is likely functional.[/TD]
[/TR]
[TR]
[TD][B]Battery...

Oh, sorry! Are you still having issues with your Mac?
​

Alright! Since you've already replaced [B]U7000 (CD3215/17)[/B] and [B]Q7130[/B], but [B]PPBUS_G3H is stuck at 10.7V instead of 12.56V.[/B]

This issue suggests that [B]U7000 is unable to generate the correct PPBUS_G3H voltage[/B], which means we need to [B]troubleshoot power regulation, feedback circuits, and load issues[/B]. [HR][/HR] [B][B]Troubleshooting for PPBUS_G3H Low Voltage Issue[/B][/B]
[HR][/HR] [B][B]Check U7000 (CD3215/17) VIN & Power Rail Behavior[/B][/B][LIST][*]U7000 is responsible for USB-C communication and power delivery negotiation. If it doesn't communicate...

[B][B]Possible Causes[/B][/B] [TABLE]
[TR]
[/TR]
[TR]
[TD][B]SMC (System Management Controller) Bug[/B][/TD]
[TD]Sometimes SMC does not properly detect a fully discharged battery[/TD]
[TD][B]Reset SMC & PRAM[/B][/TD]
[/TR]
[TR]
[TD][B]PPBUS_G3H Voltage Drop[/B][/TD]
[TD]If PPBUS_G3H is too low, charging does not start[/TD]
[TD][B]Check PPBUS_G3H (Must be ~12.56V-12.6V)[/B][/TD]
[/TR]
[TR]
[TD][B]Corrupt Battery Data / SMBUS Issue[/B][/TD]
[TD]Battery...