Appendix B: Troubleshooting - Mitsubishi Electric 3D DLP 742 series Owner's Manual

44 Appendices
Appendix B: Troubleshooting
General TV Operation
Symptom Remarks
1. The TV remote control does not work. • Check that the batteries are fresh and installed correctly.
Be no more than 20 feet from the TV when using the remote
control.
If using an external 3D emitter, try pointing the emitter in a
different direction or disconnect the emitter.
There may be interference from the TV's internal IR emitters
for 3D glasses. Turn off the emitters in the Picture > 3D
Mode menu.
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2. When I try to use the remote control, the Replace the batteries.
POWER key blinks five times.
TV does not respond to the remote control • Unplug the AC power cord for 10 seconds.
or to control-panel buttons and TV will not • Press and hold the POWER button on the control panel for
power on or off. ten seconds to perform system reset.
4. When a device is selected from the Input • Make sure the selected device is turned on.
Selection menu, the screen is blue or black (no • Check connections to the device.
5. ':You have forgotten your Lock menu pass See "Bypassing TV Locks," page 35.
code.
6. Rating restrictions are not working. Open the Lock > Parental menu and:
Verify that the ratings locks are active.
Check the Lock Time/Unlock Time to check if rating restric-
tions are disabled.
Rating restrictions apply only to content on the ANT input
and composite Y/VIDEO inputs.
7. On-screen displays appear each time you Normal TV operation.
change a function.
8. A warning message appeared on screen • Internal TV temperature has exceeded proper levels. Cool
stating, "TV will shut down in a few seconds, the room.
Please check if the air flow is blocked." * The TV has overheated. Clear blocked air vents and ensure
at least four inches of clearance on all sides of the TV.
For assistance call 1(800} 332-2119