BenQ TH683 - Manual (Page 29)

Operation 29
6. The projector will start to search for input signals. The current input signal being
scanned displays in the upper left corner of the screen. If the projector doesn't
detect a valid signal, the message 'No Signal' will continue displaying until an input
signal is found.
You can also press SOURCE on the projector or remote control to select your
desired input signal. See
"Switching input signal" on page 42 for details.
If the frequency/resolution of the input signal exceeds the projector's operating range, you will
see the message 'Out of Range' displayed on a blank screen. Please change to an input signal
which is compatible with the projector's resolution or set the input signal to a lower setting. See
"Timing chart" on page 69 for details.