You cannot use a USB flash drive to gauge the compatibility of a 1TB USB 3.0 external HDD.
Try ka muna ng ibang external HDD na USB2.0. Somehow mas mataas ang reliability ng USB2.0 kapag directly connected sa TV - even sa PCs, some external connectors would instruct you to connect sa USB2.0 first then install the driver and then tsaka palang connect sa USB3.0
Anyways, yung compatibility ng external USB3.0 drives to a particular make and model ng HDTV is still rather gray. Sa Japan, they mention sa label ng external HDDs which TV makers are confirmed to be compatible - if not mentioned - no guarantee of working.
Good luck
One question nga pala, is that a portable bus-powered 1TB USB3.0 or a full sized self-powered 3.5" 1TB USB3.0? If portable bus-powered lang, malamang hindi enough ang current supply from the USB port ng TV mo kaya hindi matuloy ang initialization - solution is very simple - connect a POWERED USB hub sa TV and doon ka mag-connect sa hub na yon.