Before t.v. completly shut down I could only turn t.v. on by remote. The manual controls only work once in a while. Then one day I went to turn on the t.v. and it didnt go on since. what can I do to fix it.

If you're NOT still under warrantee you should at least open the TV and look for a blown fuse near where the power cable enters the set. A lot of times you can buy replacement fuses at a local electronic or hardware store and they're easy to replace.
Check the fuse. If it is blown, it will be obvious and make sure that the set is unplugged before replacing it. If it blows again, or if it is not blown, your problem is probably in the 'X' volt regulator and you will need professional help with the repairs.

You can also check the board where the components are mounted and resoled any that look bad. Brief power outages may cause the TV to turn off on its own. If you are using a surge protector, try connecting the set directly to the wall outlet.

In your case it could caused by a blown fuse, a leaky diodes or a bad solder joint at the horizontal drive transformer.
All can be replaced at a local electronic or hardware store and they're easy to replace

If this does not correct the problem, you may need to have your TV serviced.

Have you change batteries of your remote? try replacing them.

if problem still there, you need to check on the powersupply or fuse. they might have failed already and needs replacement.

also check if there are capacitors from t\your tv's nain board that started to bulge.