Your replacement can be a bit larger if necessary, but not grossly so. Carefully desolder and remove Y-201. Put it in safekeeping because you may want it for something else someday. Carefully noting the alignment of the dual in-line connector at the bottom of the board with the mating socket, press the front panel firmly into place. Be sure that the holes at the bottom of the circuit board line up two screws and tighten them 6.
Press cover into place.
Insert and tighten the screws. Insert the two remaining screws and gently tighten them. Slide the battery pack into place. Switch scanner on to ensure that the display comes on. Another possibility would be that the new resonator either doesn't work, is unsuitable, or may have been incorrectly installed.