First thing you want to do is make sure (as with all electronics) that it is plugged in to a power outlet . A power strip is recommended to protect your electronics from power surges and voltage spikes . Make certain that all are connected such as the TV and cable box etc.( SEE PIC BELOW )
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HOW TO TURN ON A TV
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MAKE SURE TV/CABLE BOX IS PLUGGED IN
TURN ON/OFF BY PUSHING POWER BUTTON
TURN ON/OFF BY PUSHING POWER BUTTON ON REMOTE
  Then once you make certain that all is plugged in correctly you can turn on by pushing the power button on your cable box or on the remote control that came with your cable box . You can plug the tv directly into the cable box so when you power on the cable box it also turns on your tv . ( SEE PIC BELOW )
  Then once you have everthing powered on you can navigate through the channels . To turn off the tv and cable box simply press the power button again to power down your electronic devices .
( SEE PIC BELOW )