Hauppauge WinTV USB, Installation And Reference Manual

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Problem: Poor TV picture quality
A poor TV image could be caused if your VGA display adapter does not
have enough video RAM to hold the TV image. In this case, WinTV
resorts to Primary Surface mode, which lowers image quality. A memory
upgrade on your VGA display adapter might fix this problem.
Problem: TV picture displays a blue screen
The TV picture might display a blue screen under the following conditions:
Momentary loss of signal
A weak video signal
Channel changing
A scrambled channel
Changing channels may cause a temporary blue screen. To fix
the problem, switch the channel up or down, then return to the
original channel.
The audio might continue to broadcast, even though the video picture displays a
blue screen. This indicates a strong audio signal and a weak video signal.
A scrambled channel is not a valid channel.
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WinTV
Installation and Reference Manual