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Could be an aerial problem...
Digital TVs give a "perfect" picture even with a degraded signal,
up until the signal is so bad it drops altogether.
Most digital TV's have a signal strengh & quality meter buried in the settings menu somewhere....
Couldn't tell you exactly - don't know what telly you have ;-)
If it works ok with (for example) a DVD player, you could keep it as a backup/games room/super duper pc monitor....
good tellys are a bit cheaper nowadays ;-)
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