Recent updates.
If voltage is 19V+ on pin 21 but the screen is still dark:
If the light is functional but behaving erratically, you can try a factory reset:
Here is the specific data you came for. Below is the physical path of the backlight voltage (VBAT -> LED_ANODE -> LCD_PIN).
If voltage is 19V+ on pin 21 but the screen is still dark:
If the light is functional but behaving erratically, you can try a factory reset:
Here is the specific data you came for. Below is the physical path of the backlight voltage (VBAT -> LED_ANODE -> LCD_PIN).