Yes, the device, I believe model 3800, has been connected to my Sony TV USB port since I purchased it and it has performed flawlessly. I'm a bit confused as to how suddenly the TV, after a year and a half, isn't supplying enough power, and the warning only occurs when I watch an Amazon program. Any ideas why it seems specific to Amazon shows? Thanks.
I can only make a complete guess about Prime, but depending on the bitrate and codecs in use it may draw just that much more power than other channels. As to why the USB port has worked well in the past, you just got lucky. The USB 2.0 standard, which is likely all your TV has, only supplies 500 mA (1/2 amp), and Roku players need more than that. The Stick is probably close to that, but if the TV drops its current just a hair you've crossed into the low power region. Most Roku wall cubes have at least 750 mA, while the ones for the Ultra are over 1 amp. Simply because the Ultra needs more power because of the Ethernet jack and other hardware reasons.
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