The logic board of the MacBook Pro (13-inch, 2018, Four Thunderbolt 3 ports), model A1989, 2018, 13-inch, Four Thunderbolt 3 ports. 8 known faults with their symptoms below.
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.
| 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_RTC | 3.3 V | 3.3 V for the CD3215s; R7900 passes it into U7800 as PP3V3_G3H |
| PP3V3_G3H | 3.3 V | 3.3 V from U7800 through R7900 |
| PP3V3_S5 | 3.3 V | Intel S5 rail; missing with corrupt T2 firmware |
| PP5V_S5 | 5 V | Intel S5 rail; often still present with corrupt T2 firmware |
Checked on 2026-10-29 against 2 sources: verified. Revision A is a placeholder until Studio records the real revisions.
Seen in 25% of recorded fixes on this board.
The fix, the readings that point to it and the guided tree are in the app. Free account
Seen in 20% of recorded fixes on this board.
The fix, the readings that point to it and the guided tree are in the app. Free account
Seen in 20% of recorded fixes on this board.
The fix, the readings that point to it and the guided tree are in the app. Free account
Seen in 15% of recorded fixes on this board.
The fix, the readings that point to it and the guided tree are in the app. Free account
Seen in 5% of recorded fixes on this board.
The fix, the readings that point to it and the guided tree are in the app. Free account
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.