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It sounds like the video output isn't working its most likely a component failure 1 thing you could try is connecting a rca cables from video/audio out on the set to another set vid/audio inputs to see if it the video gets through.This is a problem that requires technical knowledge and test equipment to trace the video signeal
there are 2 types of flicker, one is the lamps that drive the display and the second is the sync signal of the video. I assume the video sync is the flicker you see, I would try connecting a different way to make sure it is not the tv, connect using the aux /rca connectors to cable box. and or connect using the cable direct bypassing the cable box. I have seen several complaints about the hdmi cable signal being incorrect in some way, this is the same issue that the svideo connector had in its early adoption signal was too hot or too low. another thing to watch out for is the low light sensor on the front of tv if it gets an incorrect reading it can flicker the back light though it should be slow in doing so. some times the flicker you see is not flicker but ac running through the sides of the picture from an ungrounded cable source. how does it perform if you play a dvd player , with and without the cable box connected.
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IF you are saying that every thing is connected properly check your video cable it could be bad use a new one if that does not rectify your problem it is time to call in the tech you could be having problem in your video circuit but you did not mention if the screen light up with no picture but with sound or it does not light up blank with sound.however there could be two things 1 if the screen lightup with normal sound it could be a leaky ,open, or shorted, transistor or ic in the IF circuit.2 If the screen does not light up and has normal sound it could be a defective horizontal stage.so it is time you take the set to a tech for repairs.good luck.