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Backlight failure. Started off as an intermittent failure after an hour or so and then failed after a few minutes. Let's take a look at another component level repair for £0.45.
UPDATE: This failed again after a few days. On further examination there was horrendous ringing from the converter because of mis-matched I/O impedance. I replaced the Schottky diode for a faster one and a lower ESR cap and all is well now.