First things first, please confirm that you have tried TV/0463 and can verify that it doesn't work. Then try the following steps to search for a code...

SEARCHING FOR YOUR CODE
If your home entertainement device does not respond to the DRC450 after trying all of the codes listed for your brand, or if your brand is not listed at all, try searching for your code. For example, after trying all of the codes for your TV, you still cannot get the DRC450 to operate your TV, then:

1. Turn on your TV.
   
2. On the DRC450, press and hold TV (at least 6 seconds) until you see the programming mode start. Each of the mode key lights will turn off and on sequentially, starting with AUDIO on through TV, and the sequence will repeat twice. During this time, release TV and wait until it’s lit continuously.
   
3. Press the (Up) cursor key once to start the search mode. NOTE: In the search mode, the DRC450 will send IR codes from its library to the selected component, starting with the most popular codes first.When the device responds to a subsequent key command (e.g., POWER), the correct device code will be found.
   
4. Press POWER once.The TV key will light on and off, showing that an IR code has been sent.
   
5. If your television does not turn off, press the (Up) cursor key once again to call up the next IR code and press POWER once again.
   
6. If your television still does not turn off, repeat step 5 as many times as needed until your TV turns off.
   
7. When your television does turn off, a working code has been found. Press OK once to save the code and the TV key will blink three times, confirming the selection.
   
8. To search for the codes of your other devices, repeat steps 1 through 7, but substitute the appropriate mode key (i.e., VCR/DVD, CABLE, or AUDIO) for the device you are searching for.