The Vim is a low powered unit 1 Amp would be ok just...
If under heavy load of decoding video's or an external USB Device (HDD) it may
take it over the safety level of the TV's usb supply.
I have an AMP meter and I watch the peaks it can at times go over 1 Amp when Download and doing Stuff.
Just a warning hate your TV to go Bang due to a lack of power power for the Vim.
The price of a plug pack compared to a TV, I know i would have a plug pack