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If the display isn't illuminated and you replaced the main control board, the only thing left would be the display board itself. There are no fuses or cut outs that would stop the display from illuminating. Do make sure the wire harness connection above the door which goes through the top door hinge isn't broken and make sure the pins aren't burnt if you pull apart the connection and look at the plug itself. If that all checks good, then order and replace the display board which is part number WR55X23210.
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The display is blank, the board is new. All you can do is check the wire connection at the top of the door and if that checks good then you replace the display board. The display board is what tells the main board how to work so without a display then the refrigerator can't run. There unfortunately isn't anything you can do with a multimeter for this issue since the 2 boards communicate with one another and those connections aren't testable. The display would just need to be replaced if the wires at the top of the hinge are good.
Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! I suspect the issue is still with the main board in the back of the cabinet. What was the part number of the board that you installed? Did you buy it new?