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Re: reset
if the lines are at the top of the picture and white on black and constantly change, then it's nothing to worry about, it is only the 'teletext' information for that channel.
The channel in question is not broadcasting the picture ratio correctly or the blanking sync is slightly out on the set or transmitter gear.
The text information lines are normally hidden and not usually visible to viewers. Ordinary teletext typically uses up to 16 lines within the Vertical Blanking Interval. (Period between active picture fields)
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