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What you may see in the first second or two is not relevant, as how any given receiver behaves before all the components come up to normal temperature and operating voltages is very different from up in a stable state.
Thus the alignment instructions clearly state “allow a 20 minute warm up period.”
What you are most likely seeing is the IF/and or tuner passing video before things have fully come up to power and stabilized, this is not unusual, the alignment method of course would be to get it to pass video when it's fully up and warm.
Also, the sync sep has been shown to be in a good state already, if it was not, you would have no video lock, and or unstable video with the direct video input.
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