Everything works expect the face doesn't light up.
This can be as simple as poor connection on the display itself or a problem in the power supply. Look carefully at the connections for the diplay panel on the PC board attached to the front face of the unit. Specifically, look at the pins on either end. If those look grainy or have rings, then most likely the display is not getting powered. Resolder those pins and let me know what happens. That may resolve the problem.
Dan
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