KB Article: http://support.microsoft.com/kb/2708283
Consider the following scenario:
- You have a Windows 7 computer configured with a digital TV tuner.
- Windows Media Center is configured to use the digital TV tuner.
- You launch Media Center and then choose Live TV to watch TV.
- You change the channel.
In this scenario, soon after changing to a certain channel you may consistently see a message that resembles the following:
Weak TV Signal
The TV tuner is unable to receive the signal for the channel you have selected. Adjustment to the signal may be necessary to receive this channel reliably. Please try to select this channel again. If the problem persists, contact your TV service provider.
This message is displayed even though the signal is not weak and there does not appear to be any noticeable dropped frames or loss in video quality.