Acer AT2001 - Manual (Page 33)

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Normal Picture, No Sound
Make sure that the volume is not turned down.
Make sure that the sound is not muted.
Make sure that your audio input source cables are connected securely and
correctly.
Wrong Image Size
If you are using VGA mode, make sure that the H-Position and V-Position in
the OSD is set correctly.
Screen Noise
When your LCD TV’s digital capabilities exceed a digital broadcast signal, the
signal is up-converted (increased) to match your LCD TV’s display capabilities.
Up-converting can cause noise or trash.
Dim Screen
Video display devices experience degradation of brightness over the life of
the device. Normal brightness degradation is not covered by your warranty.
Pixel Problems
Your LCD TV is manufactured using an extremely high level of precision
technology. However, sometimes some pixels of your LCD TV may not display
correctly. Pixel defects within industry specifications are inherent to this type
of product and do not constitute a defective product.
Remote Control Not Working
Make sure that the batteries are inserted correctly.
Make sure the remote control sensor window is not under strong lighting.
Technical Support
If this troubleshooting information does not resolve your problem or if you
have other questions relating to your LCD TV, please contact your local
dealer.