My Sylvania 6842-PEM is a few days short of being 11 months old. Three days ago this problem started. Around 20-30 minutes after the unit is turned on (after being off for a number of hours) the display starts flickering/blinking. You see thin black horizontal lines & sometimes a wide white horizontal line. The intervals between flick/blink are a few seconds to a minute. After about 10 minute the problem stops. I have had the tv on for over 7 hours after the problem stops with no recurrences.
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Something is breaking down. Possibly a specific ceramic capacitor on the main power pcb that has been troublesome. Usually there is just a loud pop and the screen goes dead. If the set is less than a year old it is still on parts warranty and the technician could just change circuit boards until the problem is gone.