Roku shows a purple screen or HDCP error. Check the HDMI chain.
Use the same title on a direct television input to narrow a Roku HDCP warning to the receiver, cable, port or display.
IPTVBlogs editorial desk · 
If Roku shows a purple screen or names HDCP, start with the path from the Roku to the TV. The account can sign in, the menus can work, and the HDMI chain can still fail the check when protected video starts. A direct connection to the television is a practical way to remove a receiver, soundbar or HDMI switch from the test.
Establish a clear before-and-after
Write down the exact error and the title that triggered it. Try a second title in the same service and note whether Home stays visible. Record the path in order: Roku → receiver or soundbar → TV, with the input numbers if you can see them. If you already have a known working direct TV input, use it for the next run. Power down before rearranging cables. Reconnect the Roku directly and use the TV’s built-in speakers for the test.
Play the original title with the normal output format unchanged. If it works directly, reconnect the equipment one piece at a time. Put the original receiver input back first and compare the same title. If the receiver path uses two cables, keep track of which you are testing. One test that changes the TV input, cable and output resolution all together may recover the picture while leaving the real cause hidden.
| Result | Next comparison |
|---|---|
| Direct connection works. Receiver path fails. | Check the exact receiver input and output for the required HDCP and video format |
| Both paths fail with the same cable | Try a known working cable and the TV input recommended by its manual |
| A basic output works. The higher format fails. | Check the TV input, any intermediary and both cable runs at the intended format |
| Only one title fails after the HDMI path works elsewhere | Ask the service which playback format or account rule applies to that title |
Keep the difference between a blank and an error
A brief resync while the display changes video format can happen without a persistent HDCP failure. Record whether the purple screen stays visible, the error appears only when protected playback starts, or the signal disappears even at Home. That observation makes it easier to choose between the HDMI chain, the display format and an app or source problem.
After testing, restore the sound path you prefer, then replay the title that first failed. Verify audio as well as picture. If the receiver only supports a lower mode on the available ports, leave the Roku on a stable documented format until you have a compatible path. Keep a short connection diagram for your next firmware or cable change.