Quick Reference Cards

Printable cheat sheets for board-level diagnostics: voltage tables, diode mode readings, power-on sequences, charging protocols, and tool settings. Each card is optimised for fast lookup at the bench.

3 of 16 cards published

Board Voltages

• 820-01521 Voltage Reference — MacBook Pro 13 2019Known-good DC voltages for all major rails on the 820-01521 board
• 820-02060 Voltage Reference — MacBook Air 2020Known-good DC voltages for all major rails on the 820-02060 board
  820-02060 voltages macbook-air-2020
• 820-02521 Voltage Reference — MacBook Air M1 2020Known-good DC voltages for the M1 MacBook Air 820-02521 board
  820-02521 voltages m1
• 820-00239 Voltage Reference — MacBook Pro 13 2017Known-good DC voltages for all major rails on the 820-00239 board
• 820-3787 Voltage Reference — MacBook Pro Retina 2013Known-good DC voltages for all major rails on the 820-3787 board

Diode Mode

• Diode Mode Readings — 820-01521Expected multimeter diode mode readings at key test points, 820-01521
• Diode Mode Readings — 820-02060Expected multimeter diode mode readings at key test points, 820-02060
• Diode Mode Readings — 820-00239Expected multimeter diode mode readings at key test points, 820-00239

Charging

• USB-C PD Negotiation Reference for MacBook RepairUSB-C Power Delivery voltage/current contracts, CC line signals, and expected scope readings
• MagSafe Charging Diagnostics — Quick ReferenceMagSafe 1 and MagSafe 2 expected voltages, LED states, and ID pin protocol
• Apple Battery SMBus Communication ReferenceSMBus commands, expected responses, and gas gauge register map for Apple batteries

Power States

• Apple Power States Reference (G3/S5/S4/S3/S0)Which voltage rails are active in each ACPI power state on Apple MacBooks
• SMC Power-On Sequence ReferenceStep-by-step signal timeline from PPDCIN arrival to CPU boot — a cheat sheet for no-power diagnosis

Tools & Settings

• Oscilloscope Settings for Board Repair — Quick ReferenceRecommended time/div, voltage/div, probe settings for common Apple board signals
  oscilloscope scope settings
• Hot Air Station Settings for BGA / SMD WorkTemperature and airflow profiles for common BGA sizes, SMD components, and underfilled chips
• DC Power Supply Limits for MacBook Board InjectionSafe current-limit settings when powering boards at 5 V / 12 V / 20 V for diagnostics