Hello everyone,
I need your advice in diagnosing a motherboard issue on a Lenovo IdeaPad 3 15ITL05, motherboard HS45A/HS55A Rev 1.0 NM-D461 (2020-11-02).
Symptoms:
The laptop does not power on and does not respond to the power button.
Background:
According to the owner, her child was playing on the laptop when it suddenly shut down.
What has been done so far:
Original charger is missing; the non-original one was tested and found faulty (0 V output).
Using a lab power supply (20 V, 0.5 A) — no activity on the board, no LEDs, no standby voltages....