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Connect ANTENNA OUT of STB to antenna terminal on rear of TV OR, for better picture, connect 3-wire cable to color coded L AUDIO, R AUDIO, and video outputs on rear of STB and connect other ends to L AUDIO, R AUDIO, and video inputs on rear of TV.
If STB connected to antenna terminal of TV, set CH 3/4 switch on rear to whichever channel is NOT used in your area.
Connect antenna to ANTENNA IN of STB
Connect STB to power and use STB remote to turn on
Turn on TV
If STB connected to antenna terminal of TV, use TV remote to select channel 3 (or 4).
Use STB remote to select SETUP and perform channel search.
With the HDTV set for an HDMI Input that matches the HDMI Jack that you've connected to the cable HD STB (set-top-box or "converter"), use the cable STB remote to change channels on the STB - not the TV.
You can not change channels of the STB with your TV remote. You may however, be able to program your STB remote to operate your TV. Most will allow you to power the TV on / off; volume up / down / mute; change input (HDMI1 / HDMI2 / ANT / Composite / etc.) and even some of the more complex functions as well. Contact your cable company for more details.
You must have a UHF / VHF antenna connected to the antenna input of the TV to scan for digital channels. Most new TV's have a threaded, round 75 ohm coax cable connection for this - but yours might even have connection consisting of 2 small screws to connect a 300 ohm twin lead antenna cable instead. Use which ever yours has.
If you are using this input for the input of a cable TV "set top box" (STB), satellite STB, or similar, you will likely only find a single analog channel (Ch3 or Ch4) after a scan as the scan will only find the output of the STB - which is usually on Ch3 or Ch4 - and not be able to scan the STB channels.
Additionally, the antenna input of the TV will only provide a standard definition picture if connected via coax cable from the STB. It will only provide a high definition picture if connected to a UHF / VHF antenna anda broadcaster is close enough for its signal to be received by the antenna. The way to obtain the best possible picture (high definition) when using an STB for tuning channels is to use an HDMI cable between the STB and TV. An HDMI cable will provide the very best picture and audio signals from the STB to the TV; all over a single cable and is the recommended practice.