Trying a USB connected hard-drive shouldn't break the television. You will definitely want to check to make sure that the voltage on the USB drive doesn't exceed the limits of the USB's power input.
In the U.S., the device has a maximum of 500mA or 5 volts. Check the manual in your region to verify this before attempting to connect a HD device. Otherwise, no it shouldn't have any bad affect on the TV.
I have put my usb stick into my TV and it works fine.
and i have a USB harddisk can i put it into the tv ???
any won thats have try to put a hdd in?
ore will the tv broken ??
sorry for my bad english