Question Why my refurbished ThinkPad p53 keyboard light is flickering?

[radonba2]

I just bought a refurbished Lenovo ThinkPad P53 from Amazon , I am trying to test it. There is a paint job done , there is loud fan noise with tinning sound. The main issues I am worried about is that I think the keyboard is not original , I am not sure how to check, but the backlight is flickering. The low level mode works sometimes also, most time there is no light. When I increase the brightness of the keyboard, the light slowly comes on and starts flickering randomly, rarely it stables. I am worries that it could be a motherboard issues, cause I have seen keyboard issues related with motherboard with other people. What should I do ?

 

[rgd1101]

return it