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have the same problem, one or more of the flourecent light bulbs in the back panel got broken, looking for a supplier who may keep these bulbs in stock, or other wise will see if i can get a used one off ebay for spares.
One of two things either the disply has gone out which is likely as it is a common failure for that thermostat or your heating unit is not sending control power. the older chronotherms were system (24volt ac) powered the new hardware/box store units are battery powered. Either way display should not be blank with fresh batteries. to get heat on remove the thermostat jumper or twist together the wire from the R terminal with the wire from the W terminal. note the color of each wire for later reference, heat up house disconnect wires from each other and go purchase a new thermostat