Remote Control Problem

Try replacing the infrared emission LED at the front of the remote control. It can be bought from most of the electronic spare part selling shops.

Infrared sensor inside the TV is damaged. Replace it.

Check this after replacing the the batteries of the remote control with fresh ones. If the problem still persists, the remote control and the infrared sensor inside your TV [both] should be checked.

either the remote is bad or on the tv the circuit board at has the remote receiver on it is bad. If you bought it new and it has a warranty contact them for service. If not you could try programming a universal remote to see if it will work your set.

You can buy an original replacement remote for your TV clicking the link below:

New Original Sylvania SRT2319 Remote Control $39.99

I had the same problem.  The problem is strange and seems to be with the receiver in the TV and not the remote control.  The reason I say this is that when this first happened my Samsung brand DVD could actually control the TV.  This then also failed, but still works fine with the DVD player.
Anyway there is an even more bizarre fix to all this......
- Remove the batteries from your TV remote. - Press and hold the red (ON/OFF) button for at least 1 min. - Replace the batteries and hey presto!!
I know seems far fetched but I found it on the Samsung website and it does work.

Clean both red filter plastic windows, 1 at the remote control end and 1 at the tvs InfraRed receiver end, with window cleaner on a soft cloth. If this doesnt work you need to confirm operation with another working remote. Either the transmitter(remote) or receiver (tv) could be faulty.
Anything obstructing the IR path to the receiver located at the bottom edge of the tv bezel?

Bad connects at sensor inside TV or bad sensor.......
Toshiba part # 23009490............T.

You can also try to take out the batteries and push all of the buttons with the batteries out of the remote. Then put the batteries back in and push the power button on the remote. If this doesnt work press the two TV buttons at the same time and the remote should be fine.