Yes, all Roku players support HDCP. Your TV is quite old, and is only 720p resolution. However, all Roku players support that resolution. You did not specific the specific version of Express you have, as there are now eight different versions of the Express. I wish Roku would stop reusing the same name on different hardware.
To see if your Roku is working properly, you could connect it to a different TV and see if it works. Also, you could try connecting something else to the LG to confirm it too is working. But since the Roku was working properly on the previous TV, it's not likely there's an issue with it. Perhaps the HDMI cable is bad, but my guess is the TV itself is more likely.
Dan
Roku Community Streaming Expert
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