Shorting out the 128 pins with conductive liquid. Diagnostic Steps
Includes support for PWM (Pulse Width Modulation) for fan control, LED drivers, and SMBus controllers. kbc1126nu datasheet hot
[Start Board Diagnostics] │ ▼ [Measure Resistances on VCC Pins] ──► (Low Ohms/Short?) ──► YES ──► [Inject 1V-2V on Rail & Locate Short] │ │ ▼ NO ▼ [Measure Voltages on VCC Rails] ──► (Over 3.3V?) ──► YES ──► [Replace Step-down Regulator First] │ ▼ NO [Isolate Keyboard/Touchpad/GPIO] ──► (Chip Stays Cool?) ──► YES ──► [Replace Faulty External Component] │ ▼ NO [Isolate Chip / Confirm Fault] ──► [Remove KBC1126-NU from Board] ──► [Verify Main Board Short is Gone] │ ▼ [Solder New KBC1126-NU Chip] Step 1: Resistance Checking (Power Off) Shorting out the 128 pins with conductive liquid
