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Vintage electronic devices that use LCD digital displays could be affected by the problem, such as missing segment fault. The Philips AE3750 radio I had, also experienced the problem.
My Philips AE3750 radio also had this problem.

in this case, it could be due to an electric insulator getting in between the elastomeric strip (zebra strip) and the exposed pads of the LCD and PCB. This could come in the form of a dust, or even oxidation PCB pads contact. To repair this, just clean all the pads and the elastomeric strip itself.

I use contact cleaner, cotton ear buds, and a little touch of tweezers for the cleaning process. After cleaning process, Then reassemble the LCD & frame on the board and test.