Are you sure it's a US TAM?
The easiest way I've found to tell whether it was a US TAM, as opposed to a European (UK, France, Germany) or Japanese version is to open the FM Radio application:
- If you can tune to US stations like normal (87.9-107.9MHz, tuning to odd KHz frequencies (ex 90.9, 101.1)) you've got a US TAM
- If you can tune to a lot more stations (87.5-107.9MHz), tuning to odd and even KHz frequencies (ex 95.8, 104.9)) you've got a European TAM
- If you can't tune to most US stations (frequencies limited to ~76-90MHz) you've got a Japanese TAM.
If it turns out you've got a European or Japanese TAM the TV tuner would only accept PAL (for the European ones, unless the French version got a SECAM tuner) or NTSC-J (for the Japanese one) signals so far as I'm aware...which means you'd be out of luck for using the coax input as I don't think in the TAM the video standard was switchable.