COBY DVD978 - Manual (Page 19)

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ish
Connections
Video System
Choose the best available video connection. Avoid using more than
one connection at the same time to prevent signal interference. The
video settings of the unit must match the video connection used. Press
<V-MODE> on the remote to change the video setting, or change the
video settings in the System Setup menu (please refer to the System
Setup section of this manual for more information).