Subject:  I Have A Horizontal Purple Or Green Band On My Screen That Goes Up Continuously

Question:

How to troubleshoot a continuous horizontal purple or green band on the screen when using a set-top box connected via component cables?

Answer: 

Below is an example of the rolling band that you may be seeing.

Some customers have reported seeing a continuously rolling purple or green band on their TVs sometimes accompanied by a humming noise from the speakers while using a set-top-box connected to their TV through the component (Y, Pb, and Pr) connections.

This problem is most likely caused by a poor ground in the set-top-box.

To establish that this problem is caused by the set-top-box, follow these steps:

1. Change the source on your TV to see if the problem occurs on a different source.

For Example: If you have a DVD player, Game system, or other device connected to your TV, change the TV to that input source and see if the problem occurs. If the rolling and buzzing stop, this indicates that the set-top-box has a grounding issue.

2. Return the source to the set-top-box, and then remove the left and right audio connections from the set-top-box component connection. If the buzzing stops, this also indicates that the set-top-box has a grounding issue. If the buzzing continues, click here to see other troubleshooting options.
3. Replace the component video cables with an HDMI connection. If the buzzing stops, this is another strong indication that the set-top-box has a grounding issue. If the rolling line and buzzing continue, click here for further troubleshooting options.
4. If Steps 1, 2, and 3 indicate that the problem is caused by the set-top-box, permanently replace the component cables with an HDMI cable

Note: You can also try replacing the set-top-box. However, replacing the set-top-box may not resolve the problem. Using an HDMI cable will resolve the problem if it is caused by a bad ground in the set-top-box.