Optoma TH7500 User Manual page 55

Steady light 
No light 
The projector stops responding to all controls
If possible, turn off the projector, then unplug the power cord and

wait at least 60 seconds before reconnecting power.
Check that "Keypad Lock" is not activated by trying to control the

projector with the remote control.
Lamp burns out or makes a popping sound
When the lamp reaches its end of life, it will burn out and may

make a loud popping sound. If this happens, the projector will not
turn on until the lamp module has been replaced. To replace the
lamp, follow the procedures in the "Replacing the Lamp" section on
pages 57-58.
LED lighting message
Message
Standby State
(Input power cord &
Switch on)
Power on (Warm-
ing)
Lamp lighting
Power off (Cooling)
Error (Lamp 1 fail)
Error (Lamp 2 fail)
Error (Fan fail)
Error (Over Temp.)
Error (Lens shift)
Appendices
POWER LED Temp LED
(Red/Blue) (Red)
Flashing Red
Flashing
Blue
Blue
Flashing
Blue
Flashing
Red
Flashing
Red
Flashing
Flashing
Red
Flashing
Red
Flashing
Red
Lamp LED 1 Lamp LED 2
(Amber) (Amber)
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