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look for a tiny hole in the button panel. It may or not be marked reset. Straighten out a paper clip and push it in the hole slowly until you feel it stop. Gently push it to reset the TV. If that doesn't work, then look at the lamp cover door to see if it is closed all the way. The switch may be bad too.
NOTE: Some TVs have a reset button.
If available and accessible, try using the reset buttons before using the
steps below. Using the reset buttons can save time. Figure 1:
Example of the reset button labeling on the LC2600N 1.Unplug the TV
power cord from the power outlet. 2.Unplug any
connected devices (DVD, Set-top boxes, etc...) 3.Press and hold
the TV power button for five seconds. 4.Plug the TV power
cord back into the power outlet and turn on the TV. 5.Open the on-screen
menu to confirm that the TV is responding again. 6.Turn off the TV
and reconnect the devices. 7.Turn on the TV.
Can you call up the settings menu? Check to see if the ANT-1, DVD, and other ports are properly activated. You may need to re-scan for channels and to activate the HDMI ports for your other devices. Regards.
There is a TV/VIDEO button on frond panel of the tv. When you press each time this button then you will able to access different video inputs. if the button is inactive the probably the micro switch for TV/VIDEO button may be faulty. also check the same with the remote. If its doesn't help then try to reset the tv to factory default setting. For that you need the remote. Keep in mind that when you reset the tv to factory default setting all the memorized parameters will erased(like channel memory, personal preference setting etc ). For reseting the tv to factory default do the following
1.Turn on the TV. 2.While holding down the RESET button on the remote control, press the POWER button on the TV front panel. The TV will turn itself off, then back on again. Release the RESET button