Can anyone help me with the REW LIVE TV feature of this TV?

What I have done:
- I have formatted a 2Gb SD card
- I have set the remote control code to 73 (for controlling USB/SD card viewing)
- The SD card is working because I have done One Touch Recording onto it and can replay that.
- The remote Control code is working because I can use it to replay music from a USB drive.
- I have set REW LIVE TV to "auto"
BUT
There is no visible sign that recording is happening (LED does not switch to orange); when I try to use the remote controls to pause or rewind, nothing happens.

Would be great if someone has done this and can point me in the right direction.