No backlight,rest of the screen and tablet seems to be working well

Hi, got a tab 3 with not working backlight. Touchscreen,wifi,sound,buttons light,all seems to be working fine. Tried restarting,factory defaults ,changing the screen brightness settings, charging to 100% with no luck.

Is there some simple solution to checking out if the wires/LED light work before ordering complete new screen or checking the bugs on mainboard? Allegedly no water or falling damage sustained.

Thanks in advance.

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