I successfully hooked-up 3 Roku Express' in my home. One on an LG TV which works great! 2 on Westinghouse TV's. One works fine. The other often has completely distorted volume. I have to pull the HDMI cable and reattach it to get proper sound. I even upgraded the HDMI cable. I need to know if I have a defective Roku Express. This TV worked fine with the Comcast decoder box. Don't want to exchange if something else is wrong. Thanks!