if you can find the model number of the tv i might be able to find out, because most LG tv's have different size screws
what size screws to mount a 26' flatscreen
2" inch
No
For 3/4 inch material, use 1 1/4 inch pocket screws.
For 1/2 inch plywood, it is recommended to use 6 or 8 screws.
When installing a subfloor, it is recommended to use 2-inch screws for plywood subfloors and 1 1/4-inch screws for OSB subfloors.
m6
For 1/2 inch plywood, you should use 1 inch pocket hole screws.
For attaching a 2x4, it is recommended to use 3-inch screws.
For 3/4 inch wood, you should use 1 1/4 inch pocket hole screws.
For a typical 2x4 project, you should use 3-inch screws.
For 2x4 framing, it is recommended to use 3-inch long screws.