The logic board of the MacBook Pro (13-inch, Mid 2012), model A1278, 2012, 13-inch. 6 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 | 18.5 V | Charger input through F6905 (16.5 V with a 60 W adapter, 18.5 V with an 85 W one) |
| PP3V42_G3H | 3.42 V | Always-on 3.42 V for the SMC and charger IC; the green light comes from it |
| PPBUS_G3H | 12.6 V | Main bus from U7000 (ISL6259) or the battery; 12.23 to 12.27 V while the SMC is not running |
| PPVRTC_G3H | 3.3 V | RTC rail from the clock chip |
| PP5V_S5 | 5 V | First SMC-enabled rail; missing with PP3V3_S5 when SMC_PM_G2_EN is missing |
| PP3V3_S5 | 3.3 V | 3.3 V S5 rail |
| PP3V3_SUS | 3.3 V | 3.3 V suspend rail |
| PP5V_SUS | 5 V | 5 V suspend rail |
| PP3V3_S4 | 3.3 V | 3.3 V S4 rail |
| PP5V_S3 | 5 V | 5 V S3 rail |
| PP3V3_S3 | 3.3 V | 3.3 V S3 rail |
| PP1V5_S3 | 1.5 V | DDR 1.5 V |
| PP5V_S0 | 5 V | 5 V S0 rail |
| PP3V3_S0 | 3.3 V | 3.3 V S0 rail |
| PP1V05_S0 | 1 V | 1.05 V S0 rail |
Checked on 2026-10-29 against 2 sources: verified. Revision A is a placeholder until Studio records the real revisions.
Seen in 35% 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 30% 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 10% 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 10% 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 10% 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.