Question LG UF6450 backlight issue

[readingcraze]

I Have this TV where there is no video but audio , all funcsions works fine.
I need to know
What kind of backlight I will need?
How would I know how many are not working ?
Is LG UF6450 use any generic type of back light or I can use generic type ( if generic type of backlights are available)
Thanks in advance

 

[rgd1101]

is a led tv

 

[readingcraze]

Yes, it is UHD 4k