Why is there no LED backlight?

Question

Electronics

Hello!
Is there anyone here who is tech savvy?
The problem is this: in the Acer Aspire v5-571g laptop, the LED backlight stopped working one morning. Turned off everything was OK, turned on the next. morning and no lights.
Okay, I replaced the cable - it's useless 0.
I found a diagram on the Internet, checked the motherboard:

1-4: 19.4V
9-10: 3.3V
38-40: 3.3V
15-16: 1.2V Everything
seems to be ok?
I think mat. Is the board serviceable and can I buy a new matrix?
I thought that LED matrices do not burn out the backlight at all, what happened?
Thank you.

Answer 1

Or maybe the backlight itself kaput came
They burn out very often :)

Answer 2

Usually the backlight LEDs burn out, even if one burns out - the entire backlight will not work. They can be replaced, the issue price is low compared to replacing the matrix. You can buy used online.