I have a classic calculator that has some extra segments lit. The segments are not hard on. They come and go, to some extent, based on which keys are pressed.
The calculator, otherwise, works fine.
My problem is 'where to begin'. If you have worked on these before, is this a problem that is more likely in the display, the driver chips or the processor. I have extra drivers and LED modules but both are a pain to replace.
Which is more likely the cause?