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MacBook Pro A1502
Schematics and BoardView files for this board are not hosted here. See the sourcing card below for legal references, and our editorial standards for context.
Board overview
MacBook Pro 13" Retina (2013–2015). Schematics cover boards 820-3536 (Early 2013), 820-3462 (Late 2013) and 820-4924 (Early/Late 2015). Intel Haswell (2013) or Broadwell (2015) CPU. ISL6259A battery charger IC, LP8550 backlight boost controller. Includes both BoardView (.brd) and PDF schematic.
CPU / GPU
Intel Haswell / Broadwell
PMU / Charger
ISL6259A (charger), SMC (U16 5T591M)
Connectivity
MagSafe 2
Schematic ref.
820-3536 / 820-4924
Power rails reference
Rails listed in measurement priority order — start at the top. Each rail must be present before the next can be generated.
| Rail name | Voltage | Notes & fault hints |
|---|---|---|
PPBUS_G3H |
8.5–12.6 V | Main bus rail. From ISL6259 (adapter/battery). Measure first. Absent = ISL6259 fault or no battery/adapter. |
SMC_BC_ACOK |
3.3 V | Adapter detected signal from ISL6259 to SMC. Absent despite good adapter = ISL6259 or F7030 fuse. |
PP3V3_S5 |
3.3 V | Standby 3.3 V. SMC-generated. First soft-power rail. Short here = system won't POST. |
PP5V_S5 |
5.0 V | Standby 5 V. Generated from PPBUS via SMC enable. Check R7050 enable resistor. |
PP3V3_S0 |
3.3 V | Active 3.3 V. Requires full S0 state. Absent = CPU not booting or thermal shutdown. |
PP5V_S0 |
5.0 V | Active 5 V. Feeds USB, SD card, MagSafe LED. |
PP1V5_S0 |
1.5 V | DDR3L memory voltage. If absent: memory bus won't initialise. |
PPVCORE_S0 |
0.7–1.2 V | CPU VCore (Intel Haswell VID-programmed). Varies with CPU load state. |
Common failure zones
Most likely failures first. Each entry gives a symptom and the immediate diagnostic action.
No charging — ISL6259 fault
Measure SMC_BC_ACOK first. If absent: check F7030 fuse and ISL6259 pins 6+7 (VBAT sense). Dead ISL6259 is very common on A1502.
No backlight — screen image visible
LP8550 backlight boost IC failure. Measure PPBUS_G3H to LP8550 pin 1. Check BLEN signal from GPU. Check backlight fuse (F9700).
No power — PPBUS_G3H present
SMC not enabling PP3V3_S5. Check SMC_ADAPTER_EN signal. Measure U7000 enable pin. Common after liquid damage.
Short on PP3V3_S5
Measure resistance with board off. Remove capacitors around PP3V3_S5 bus to isolate. Liquid damage under SMC area most common.
Kernel panic — random crashes
Check PP1V5_S0 stability under load. Failing DDR3L or instability in memory voltage rail. Also check thermal paste.