Consider the following scenario. You have a Windows Vista-based computer that runs Windows Media Center. The computer uses a Phase Alternating Line (PAL) or Systeme Electronique Couleur Avec Memoire (SECAM) TV tuner. You use the Set Up TV Signal Wizard to configure Windows Media Center to use the PAL or SECAM TV tuner. In this scenario, when you view the Electronic Program Guide (EPG) or when you switch channels, you may experience one of the following symptoms:

• Different services have the same channel number.
• A service is assigned an unexpected channel number.
• Some available channel numbers are not assigned to a service. Therefore, there may be gaps between channel numbers.

Note: This problem is more likely to occur with users who live near the border of a foreign country and who can receive services from two countries.

Electronic Programming Guide: An on-screen guide to scheduled broadcast television or radio programs, typically with functions allowing a viewer to navigate, select, and discover content by time, title, channel, genre, etc. by use of their remote control, a keyboard, or other input devices such as a phone keypad.

When you open the Microsoft Windows Media Center TV Pack and tune to a channel that is listed in the Electronic Program Guide (EPG), you may receive one of the following error messages:

Error Message 1

No TV Signal

Error Message 2

There is currently no TV signal detected for this channel. The channel may be temporarily off-the-air, or you may need to adjust or reconnect your TV antenna.

When you open Windows Media Center TV Pack for the first time on a computer that has a Quadrature Amplitude Modulation (QAM) tuner installed, and you choose to set up your TV signal, one of the optional configuration steps will prompt you to scan for channels. When the channel scan completes, you may find a smaller than expected number of QAM channels listed in the Electronic Programming Guide (EPG).

For more information about how to remove a channel from the EPG if you receive a “No TV signal” error message when you tune to the channel, click the following article number to view the article in the Microsoft Knowledge Base:

955485 Error message when you open Windows Media Center TV Pack and tune to a channel that is listed in the Electronic Program Guide: “No TV Signal”

When you configure Windows Media Center to use a digital TV tuner in Windows Vista, you may lose the Electronic Program Guide (EPG) channel listings for some channels. You may also lose the EPG channel listings for the sub-channels of these channels. Additionally, the recordings that you schedule cannot run.