I have the Roku Express and can not connect it to a Lenovo TV. Its HDMI connection is being used by the DVR and it does not have a USB. Any ideas of the best adapter to use for optimal use?
The USB port is immaterial. You need an HDMI switch. Any of these would probably do the trick:
You connect the DVR and the Express to two of the switch inputs and then connect the switch output to your TV. You need a total of 3 HDMI cables, but some come with a cable.
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Hook up diagram