Symptom Aggregation System · All Boards
Symptom Diagnostic Hubs
Overview
Each hub aggregates per-board diagnostic checks for a specific symptom, ordered by failure
likelihood. These pages are generated automatically from the repair guide database — adding a new
guide entry will populate new fault tree rows on the next generator run.
no-power
32 checks
No Power Diagnosis
Systematic no-power diagnostic for MacBook, GPU, and console logic boards. PPBUS_G3H, S5 standby rails, PMU faults, shor…
no-display
21 checks
No Display / No Backlight
No display or no backlight diagnosis for MacBook and GPU logic boards. Backlight rail, BLEN signal, LCD panel power, GPU…
no-charging
22 checks
No Charging Diagnosis
No charging diagnosis for MacBook USB-C and MagSafe boards. CD3215, CD3217, ISL6259, ISL9239C charger IC fault tree. SMC…
liquid-damage
12 checks
Liquid Damage Recovery
Board-level liquid damage recovery for MacBook, GPU, and console logic boards. Step-by-step clean, inspect, and test pro…
random-shutdown
7 checks
Random Shutdown Diagnosis
Random shutdown diagnosis for MacBook, GPU, and console boards. Thermal throttling, VRM ripple, SMC fault tree, capacito…
bios-corruption
7 checks
BIOS / EFI Corruption Recovery
BIOS and EFI flash chip recovery for GPU and MacBook logic boards. CH341A programmer setup, reading W25Q128/MX25L12835 c…
overheating
6 checks
Overheating Diagnosis
Board-level overheating diagnosis for MacBook, GPU, and console logic boards. Thermal paste replacement, heatsink inspec…
no-usb
7 checks
No USB / Dead Port Diagnosis
Dead USB-A and USB-C port diagnosis for MacBook and GPU logic boards. VBUS load switch, USB controller, mux IC, CD3215/C…
no-wifi
7 checks
No Wi-Fi / Bluetooth Diagnosis
No Wi-Fi and Bluetooth diagnosis for MacBook logic boards. BCM94360NG, BCM43602, antenna connections, PCIe enumeration, …