Recently green 39 been flashing top left corner of screen then last week 39 changed to flashing 20. two days ago the picture just disappeared. Still had sound but no picture. Shut down for a minute and picture comes back but only stays for shorter an

d shorter intervals each time. If I don't turn the tv on for a day when I finally do i get about 1.5 - 2 hours of watching before it goes black again. Any ideas

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