That television model is always damaged by the main board, the problem is the welding of the bga chip, the older televisions did not present such problems because a better quality welding was used, but very polluting for the environment as many of the appliances they are thrown anywhere to the creeks and rivers,
To revive that TV, there are two procedures that can be done
1 is to perform a reflow with a thick flux type and you have to know how much heat distance and time can be applied