820-01041MacBook Pro (15-inch, 2018)

The logic board of the MacBook Pro (15-inch, 2018), model A1990, 2018, 15-inch. 7 known faults with their symptoms below.

Model number: A1990
Year: 2018
Revisions: Rev A

Start a guided session Download the bench app

No guided tree is live for this board yet. The profile, the viewer and manual entry are there on the free plan, and the first sessions on it build the tree.

Identity and revisions

Brand: Apple
Device: MacBook Pro
Model: A1990
Identifier: MacBookPro15,1
Board: 820-01041
Revisions: A

Power rails, in sequence

Net	Nominal	Role
PPDCIN_G3H	20 V	Charger input; diode mode to ground about 0.550
PPBUS_G3H	12.62 V	Main bus from U7000 (ISL9240); under 10 Ω to ground is a short
PP3V3_G3H_SOCPMU	3.3 V	3.3 V to the T2 and PMU
PP3V3_G3H_RTC	3.3 V	3.3 V for the CD3215s
PP2V5_NAND_SSD0	2.5 V	NAND 2.5 V rail; a short gives 20 V at 0.11 A
PP3V3_S5	3.3 V	Intel S5 rail; missing with PPVCCPRIMCORE_PRIM_REG when the T2 is not talking to the PMU
PP5V_S5	5 V	Intel S5 rail

Checked on 2026-10-29 against 2 sources: verified. Revision A is a placeholder until Studio records the real revisions.

Known faults

20 V at 0.00 to 0.02 A: T2 not talking to the PMU (PP3V3_S5 and PPVCCPRIMCORE missing)
Seen in 25% of recorded fixes on this board.
Symptoms
20 V, 0.00 to 0.02 A. PP3V3_G3H_SOCPMU present.
The fix, the readings that point to it and the guided tree are in the app. Free account
Stuck at 5 V: ISL9240 CHGR_EN_MVR, CD3215, corrupt T2 (5 V 0.060 A)
Seen in 20% of recorded fixes on this board.
Symptoms
5 V on the meter.
Parts involved
U7000
The fix, the readings that point to it and the guided tree are in the app. Free account
PPBUS_G3H shorted (under 10 Ω)
Seen in 20% of recorded fixes on this board.
Symptoms
5 V, very low current.
The fix, the readings that point to it and the guided tree are in the app. Free account
20 V at 0.014 A: PP1V8_SUS shorted (PMIC and PCH)
Seen in 10% of recorded fixes on this board.
Symptoms
20 V, 0.01 to 0.025 A.
The fix, the readings that point to it and the guided tree are in the app. Free account
20 V at 0.11 A: PP2V5_NAND_SSD0 shorted (C9088)
Seen in 10% of recorded fixes on this board.
Symptoms
20 V, 0.11 A.
Parts involved
C9088
The fix, the readings that point to it and the guided tree are in the app. Free account

Compatible donors

Donor boards

820-01041 (ISL9240 and CD3215 from a donor)
820-01326 (listed with the 820-01041 for the A1990)

Sister boards and shared circuits

820-01326: same model A1990
820-00850: ISL9240 at U7000, T2 and Calpe PMU U7800, CD3215 ports

Run this board on the bench

Open the board in NextProbe, answer the symptom questions and follow the lit point. The free plan includes three guided sessions a month. Your own boardview and schematic stay on your machine.

Start a guided session Download the bench app

Identity and revisions

Brand: Apple
Device: MacBook Pro
Model: A1990
Identifier: MacBookPro15,1
Board: 820-01041
Revisions: A

Power rails, in sequence

Net	Nominal	Role
PPDCIN_G3H	20 V	Charger input; diode mode to ground about 0.550
PPBUS_G3H	12.62 V	Main bus from U7000 (ISL9240); under 10 Ω to ground is a short
PP3V3_G3H_SOCPMU	3.3 V	3.3 V to the T2 and PMU
PP3V3_G3H_RTC	3.3 V	3.3 V for the CD3215s
PP2V5_NAND_SSD0	2.5 V	NAND 2.5 V rail; a short gives 20 V at 0.11 A
PP3V3_S5	3.3 V	Intel S5 rail; missing with PPVCCPRIMCORE_PRIM_REG when the T2 is not talking to the PMU
PP5V_S5	5 V	Intel S5 rail

Checked on 2026-10-29 against 2 sources: verified. Revision A is a placeholder until Studio records the real revisions.

Known faults