I bought Quantum QHM6660 high-speed USB 2 hub for connecting on my TV. It has 4 USB port, and a button to switch all of them on or off at once.
I inserted USB port at the back of my Sony Bravia Sony KLV-40W652D LED TV.
On inserting one of my pendrives in the USB port and I could not see it being detected on the TV.
On adding the second pendrive to the USB port, it did not get detected as well.
One thing I have noticed is that, to get the pendrives detected on the TV via USB hub you have to switch the button off and then on. Doing this the pendrives will be detected on the TV.
So those looking for a straight answer, USB hub works on Sony Bravia LED TV.