Hauppauge WinTV USB - Manual (Page 46)

does not support Windows 98 Direct Draw. In this case, you might consider an
upgrade to a new Windows VGA accelerator which has Direct Draw support and
is compatible with the USB.
A poor video picture might also indicate a bad signal. To verify a bad signal, try
one or more of these:
Move your antenna or check your cable connection.
Move possible interference sources, such as other computers or television sets,
away from your PC.
Contact the cable company to check your signal quality.
Problem: TV picture displays a black screen
The TV picture might display a black screen under the following conditions:
Momentary loss of signal
A weak video signal
Channel changing
A scrambled channel
Changing channels may cause a temporary black
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 black screen. This indicates a strong audio signal and a weak video signal.
A scrambled channel is not a valid channel: Set Primary.exe to DIBDRAW
Mode!
Problem: Snapshots don't display correctly
When using a 256 color palette, snapshots display incorrectly. To correct the
problem, try one or both of these:
Change your Windows color palette to 16-bit.
Copy the image to a graphics program and save the image as a 24-bit
image.
Primary Surface mode & DIB Draw
It is sometimes useful to use a mode of operation of your VGA card known as
Primary Surface mode or DIB Draw. This can be helpful in eliminating VGA com-
7-2
WinTV-USB
Installation and Reference Manual