Some leters do not show up making it verry hard 2 read
Assuming that the integrated circuit that provides the signals for the display is not defective (those circuits are quite reliable), the following may help.
LCD readouts have a very thin conductive film on the rear glass that is often contacted electrically by a silicon strip with fine wires embedded it which are used as connectors to the circuit board.
Both sides of this contact strip is sandwiched between the display thin-film contacts and mating contacts on the printed circuit board.
This is strictly a pressure-type connector and they are easily misaligned if not rigidly held.
The only way to correct this is to reposition the silicon conductor strip, possibly multiple times, to try to get all segments of the display working.
An instrument technician is probably the best choice to do this kind of work but the labor may be costly.
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