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OK, I have a little time while the server racks are installed.
Something doesn't seem right here, I'm not saying your measurements are wrong. just that the backlight should work since you are getting the nominal 5v at point 1.
Can you check that you get the same voltage (4.88v) at the + terminal of the LED array.
There may be two other explanations, Pulsing the supply to a higher voltage or they are switching the negative supply line. The first is possible but there is no logical reason for the second.
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