The matrix backlight of the Lenovo G580-20150 laptop does not work. Where to look for a problem?

Question

Iron

After replacing the broken matrix, there is no screen backlight. The image is there, but barely visible. Matrix working 100%. I read on the forums about a possible malfunction of the inverter, but only in Led matrices they say the inverter is not used (((Tell me where to dig the root of the problem?

Answer 1

First of all, check according to the diagrams whether the power goes to the backlight, in this case to the LEDs.