Then you’ll never get it fixed completely if the TV doesn’t allow you to turn off over-scanning. (look in the TV’s settings)
If the TV itself doesn’t allow you to do that, the only 100% correct answer is: Get a real computer monitor or a get a good TV (test it out in the store)
P.S. What you have right now is the best you’ll get (black borders) if you can’t turn over-scanning off!