Well, at last I got around to sorting this issue and bought the replacement backlight inverter board for about $20 (American) and replaced the board in the TV.
Lo! and behold! it worked. So far (and I'm keeping my fingers crossed) the TV has beenhttps://www.badcaps.net/forum/images/smilies/dancingsmilies.gif working well with no blink codes and no disappearing screen.

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