820-02016MacBook Air (M1, 2020)

The logic board of the MacBook Air (M1, 2020), model A2337, 2020, 13-inch, M1. 6 known faults with their symptoms below.

Model number: A2337
Year: 2020
Revisions: Rev A

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Identity and revisions

Brand: Apple
Device: MacBook Air
Model: A2337
Identifier: MacBookAir10,1
Board: 820-02016
Revisions: A

Power rails, in sequence

Net	Nominal	Role
PPDCIN_AON_CHGR_R	20 V	Charger input to U5200 at C5201 or C5202; matches the meter
PPBUS_AON	12.8 V	Main bus from U5200 (ISL9240); 12.60 to 13.1 V normal, 12.28 to 12.35 V with no SoC to PMIC communication
PP3V8_AON	3.8 V	Always-on 3.8 V from U5700; diode about 0.350
PP5V_S2	5 V	From UC300, enabled by P5VS2_EN from U8100; needed by the CD3217s
PP3V3_S2_UPC	3.3 V	LDO from U8100 for the CD3217s
PP3V3_S2	3.3 V	From UC710; diode at LC710 about 0.440
PP1V25_S2	1.25 V	From U7700; diode about 0.490
PP1V8_S2	1.8 V	S2 rail; a UC820 case on the 820-02020

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

Known faults

5 V at 0.00 to 0.05 A: PPBUS_AON short or creation (U5200, CD3217)
Seen in 25% of recorded fixes on this board.
Symptoms
5 V, 0.00 to 0.05 A.
Parts involved
U5200
The fix, the readings that point to it and the guided tree are in the app. Free account
5 V at 0.20 to 0.25 A cycling: short on PP3V3_S2 or PP1V25_S2
Seen in 20% of recorded fixes on this board.
Symptoms
Meter cycling at 5 V.
The fix, the readings that point to it and the guided tree are in the app. Free account
Cycling 0 to 0.45 A at 5 V: short on a U8100 or U7701 CPU rail, or PP1V8_S2 (UC820, C1105)
Seen in 15% of recorded fixes on this board.
Symptoms
Current cycling 0 to 0.45 A.
Parts involved
UC820, C1105, UF230
The fix, the readings that point to it and the guided tree are in the app. Free account
Clicking with 5 V: PP3V8_AON pulsing, Q5800, Q5820, Q5840 or U5700 corroded
Seen in 15% of recorded fixes on this board.
Symptoms
Clicking from the board.
Parts involved
Q5800, Q5820, Q5840, U5700
The fix, the readings that point to it and the guided tree are in the app. Free account
No backlight: CP860 output capacitor, FP800, UP800 corrosion
Seen in 15% of recorded fixes on this board.
Symptoms
Faint image with a torch.
Parts involved
UP800, FP800
The fix, the readings that point to it and the guided tree are in the app. Free account

Compatible donors

Donor boards

820-02016 (CD3217 and ISL9240 from a donor)
820-02020 (A2338; CD3217 in the same position is a usable donor)

Sister boards and shared circuits

820-02020: ISL9240 at U5200, PP3V8_AON from U5700, CD3217 ports, UP800 backlight driver

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Identity and revisions

Brand: Apple
Device: MacBook Air
Model: A2337
Identifier: MacBookAir10,1
Board: 820-02016
Revisions: A

Power rails, in sequence

Net	Nominal	Role
PPDCIN_AON_CHGR_R	20 V	Charger input to U5200 at C5201 or C5202; matches the meter
PPBUS_AON	12.8 V	Main bus from U5200 (ISL9240); 12.60 to 13.1 V normal, 12.28 to 12.35 V with no SoC to PMIC communication
PP3V8_AON	3.8 V	Always-on 3.8 V from U5700; diode about 0.350
PP5V_S2	5 V	From UC300, enabled by P5VS2_EN from U8100; needed by the CD3217s
PP3V3_S2_UPC	3.3 V	LDO from U8100 for the CD3217s
PP3V3_S2	3.3 V	From UC710; diode at LC710 about 0.440
PP1V25_S2	1.25 V	From U7700; diode about 0.490
PP1V8_S2	1.8 V	S2 rail; a UC820 case on the 820-02020

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

Known faults