Christie LWU701i User's Manual And Operating Manual page 124

Troubleshooting
Issues that may be easy to be mistaken for machine defects
Issue
LWU701i/LW751i/LX801i/LWU601i/LW651i
User's Manual - Operating Guide
Cases not involving a machine defect
The electrical power cord is not plugged in.
The main power source has been interrupted during
operation such as by a power outage (blackout), etc.
Either there is no lamp and/or lamp cover, or either
The signal cables are not correctly connected.
Signal source does not correctly work.
The input changeover settings are mismatched.
AV MUTE function is working.
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Reference
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020-000786-03
LIT MAN USR D2