I have encountered a failure of the SHARPEL-506P calculator, the 7th digit can only display 1 and 7. Remove the back cover of the calculator and find that the bottom left corner of the LCD panel breaks and a line is broken. Go to the professional repair station and ask for the repair station without accessories. then. I tried to repair it myself and fixed a strip of aluminum foil (packaged cigarette paper) that was as wide as the display board line to the conductive strip of the calculator, so that the disconnected line was connected. After repairing, the calculator function is restored.
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