First, turn off the set-top box and plug the smart card back in.
Let the system re-identify it. Turn it on again, if it is still the same please check the line. Try these things if you can't
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1. Telephone cable TV service provider, turn on your cable TV, after the turn on must restart once.
2. Do a complete search using the automatic channel search in your set-top box.
3. Ensure that the connection is correct. If the above is not a problem, please cable TV maintenance personnel on-site repair