The brain is alive, but the eyes are blind. The LVDS/eDP connector holds the secret. Check the backlight fuse (often blown by a dying screen). Measure the LCD_VCC. But deeper: the PCH communicates with the screen via a dedicated I2C bus. If a single pull-up resistor goes open, the handshake fails. The laptop doesn’t know it has a face.
A concise, practical guide to diagnosing and repairing laptop motherboards at the chip level. Assumes basic electronics knowledge, a soldering iron, hot air rework station, multimeter, oscilloscope (optional), and ESD-safe workspace. Laptop Chip Level Motherboard Repairing Guide
: Particularly in the charging or CPU power circuits. A failed MOSFET can prevent the main 19V rail from distributing power. The brain is alive, but the eyes are blind
Power Management ICs: These chips regulate the flow of electricity to specific sections of the board. If the 3V/5V regulator IC fails, the laptop will not respond to the power button. Measure the LCD_VCC
: The primary tool for tracing voltages (e.g., 19V, 5V, 3.3V) and checking for short circuits. Hot Air Rework Station