First you'll need to make sure your TV is on the correct input. By the way, it's likely your TV is ok, unless the input you're using is defective. If you have an external antenna for over the air reception the TV must be on the antenna input and set to Air or Antenna, not cable. If you have basic cable the input must be set to cable. If you have a box for cable or satellite you can use antenna, composite, component or HDMI input. HDMI or component will give you the best picture. At this point just make sure the TV is set to the same input the box is connected to. If you still see the no signal then the Main board is bad.
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