I have recently purchased Presto-PVR but when I scan for TV it does the scan but no channels show up. I have scanned on each twice with the same result.
Before to start the scanning process, please check if all the components are correctly connected and running. In addition, be sure to check if all the software requirements are determined.
You can also try to check the User's Manual to learn more about the scanning process and other functions. You can download it from the following official link :