For a registry editor, I use Total Commander.
Total Commander - PocketPC
Once you get it installed, then use the backslash button in the upper right corner to go to the root folder. There you should see three entries, ftp, LAN and registry. Click the registry and browse to the path below:
[HKLM\Services\MFLORSSI]
Click on the DLL key and it should say MFLO_RSSI.dll
Change the entry by adding an exclamation point (or other character, it doesn't matter), then rebooting your phone (soft reset).
The TV icon should be gone.
But also heed memoriesuntold's advice. If you are not careful, you can mess up your device. But a Hard Reset will fix that (of course then you have reinstall & re-setup your device anew.)