My sansung remote quite working, replacement universal remote was programed to the tv but the tv will still not respond. What's next?

You likely don't need a new remote. Certainly not a Universal.

Samsung remotes for LED / LCD TVs are generally RF, not IR.
Most Universal remotes do not generate RF signals, so disregard advice about codes for Universals.

Try this:

First, fresh batteries, and clean battery contacts if needed.

Then, Try Pairing procedure:

1. TV off
2. Bring remote within 3 feet of TV
3. Push Pairing button (Paper Clip or other pointed object in button hole)
4. Turn on TV
5. Should be paired. Try remote channel or other buttons.
6. If not, try 2 more times.
7. If still not working, push RESET button first and repeat Pairing.

Return the tv universal remote.Try website like Remotes.com to buy the tv original remote or a very closed compatible one.