Provided your original symptom (flat white line) still applies then the components to effect a repair are only in the region of $15, although it all depends on the actual labor charge levied by the shop / engineer. However if the original statement doesnt apply then the fault can be absolutely anywhere in the set, and if "not" used on an aerial it could also be caused by the input from whatever's connecting leads, or a defect in an external cable box etc.

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