I have a TCL C-series TV, model number 65c807 and a Sony 400 disc changer hooked up with HDMI. I can play cd's successfully, but when I switch to DVD's the TV shows no signal message.
Try a different HDMI cable.
Try a different HDMI input.
Try the DVD changer on another TV.
Thank you for these suggestions. I neglected to mention that both functions were working prior to a malfunction with the TV which has since been repaired. I will try the different HDMI cables and such but a different TV is not an option for our situation.