How to repair the display
How to repair the display of a Casio FX-991ES Plus Calculator
Scientific calculator by Casio. Widely used by students world-wide due to its great quality for the low price.
Hi @angeltwayana ,
What is the problem with the display?
If it needs replacing unfortunately, I’ve been unable to find a replacement LCD screen. You may have better luck.
Given the cost of a new calculator it may be uneconomically viable to replace the screen even if you could find a replacement part.
If it’s just that a line may be missing in the display or certain sections of the display is not working, you could always try dis-assembling the calculator and inspect the display module connections to the systemboard in case it is a faulty connection that is causing the problem.
Always remove the power source or battery from electronic equipment before starting any repairs etc.