Legion Y540 Screen Black

[donkeyoxte]

Hello I have a Legion Y540 laptop for a while now, sometimes when I turn it on, the laptop turns on but the screen is black (the keyboard light comes on, and the fans are running) Previously this problem used to happen once every two or three weeks, recently it has become more frequent

[mcplslg123]

With this description, no one can help you.

We need measurements.

To begin with, measure voltage on all coils after power button press.