Facing TV Problems? Ask a TV Technician.
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How old is the TV, measured from its date of purchase?
Please explain 'DE solder fly' - it's not a phrase that is clear to me, I'm sorry to say.
Is the interior of the TV at all dusty or dirty? if so, connectors may be obscured by it, necessitating removal of part, vaccuuming out, blowing out, cleaning all edge connectors, and reassembling.