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Here's the link to download a Sharp Manual for your TV. Look under the troubleshooting section. I have a Sharp also and have been tripped up by the advanced power options it offers; there is a setting that if you haven't given it any input for 3 hours it will go into a sleep mode. The manual has how to check for this and change it. It is different for different models.
I am sharing four cases in which your tv either turns itself off or appears to turn itself off.
TV appears to be off
You using your tv as a monitor or your pc is in sleeping mode.
Your cable or satellite Box is not outputting a signal.
TV turns iteself off
The sleep timer is set.
The off timer is set.
Your tv appears to be off:
If you are using the tv as a monitorIf you are using tv as a monitor and the stand-by light only
blinks for a few seconds when you press the power button,your pc is in the sleeping mode. To take your pc out of sleep,press a key from your key board or move the mouse.Tv turns on.
If you are using TV with a cable or satellite Box
If you have a cable or satellite Box your Tv may appear be off because the cable or satellite Box is not outputting a signal.Press the guide or info button on the cable or satellite Box remote control.
if the screen displays info or guide data,the problem is caused by the Box,you must call your cable provider.
if screen does not display info data,change the source on your TV.
To know more about the sleep mode and its adjustment, refer its user manual. It is a mode that you can set the sleep time, after which the TV will turn Off when that time is reached; after 30 min, iHr, 2Hr or so, to which that time is set for. http://electrohelponline.blogspot.com/
Check whether timer is ON mode or OFF.
If it is ON set it to OFF mode.
Check whether sleep after 15 mins is after
set it to NEVER or OFF mode(sleep means if you won't change any channel or iuf you din't did any thing for 10 it will goes to sleep mode..... and again you have to turn it ON)
This can happen when there is radio interference near the coaxial cables. Sometimes the interference is behind walls. The solution is to try a different combination of modulation and channel than what the DISH receiver is current set.
The DISH menu screen for this setting is Menu-6-1-5. With dual-tuner receivers, typically "TV 1 Out" is the TV that is connected in the same room as the receiver is located. "TV 2 Out" is the tuner that is fed to the remote TV via backfed coaxial signal.
All that needs to be done is to change the channel and mode going to the effected TV to something different. If your channel/mode is currently set to Air/60, try changing it to Cable/73. When you change the mode/channel in the DISH receiver, you need to set the remote TV to the same mode and channel.
Keep in mind that with some TV companies like VIZIO, they call their "Air" mode "Antenna". With VIZIO's the TV must be set on TV input and then go into the Menu to the Settings, Tuner Settings. Change mode type to match what you are trying on the DISH receiver, exit the VIZIO menu and manually enter the channel number.
Eventually with trial and error, you will find a mode/channel combination that isn't effected by your particular environmental interference.