@francesco50625 your TV shows burned out LED's on the backlight strips. For your model you will need two of them. Total cost will be about $20-$40USD depending on where you purchase those from. Since I do not think you can replace your TV for that cost, it absolutely is worth to be repaired.
Since iFixit does not yet have a good guide for this, use something like this video to work on it. It is similar to your model. All you need is the room and some help to deal with the panel due to the size.
While you work on your TV, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!
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Hi @francesco50625
Did you also check for corrosion on all the accessible cable connections i.e. remove cables and check cable pins and connectors?
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