Your TV or cable box needs the antenna, so that you can watch TV channels. Check if the antenna is plugged in the TV or the cable box, as you might have unplugged in accidentally. If it wasn't already plugged in, make sure that you plug it in, firmly and your TV picture problems should be resolved.
Maybe the cable operator you are subscribed to has some technical difficulties. Before you call them and tell them that there is no picture on TV, wait for up to 30 minutes as they might resolve it.
Maybe the channel you are trying to watch is currently offline. Try switching the channel first. If this works, all you need to do is to wait for the cable TV operator to fix the channel that is offline.
If you can't watch any channel, check out the other solutions.
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