LG 49UM7400PLB screen light vibrating high and low


Novice Member
I have a situation with my LG tv (49UM7400PLB), and i wish for your advice and experience.
My screen light is dimming and coming back to normal rapidly (vibrating), and sometimes it is working fine.
i tried troubleshouting (hard reset, image configuration, changing power sources .. . . )
A local repairer suggested that is it the T-Con board, other suggested to change LEDs
what should i do ?

this is a video of the situation;

Thank you in advance

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