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Scientific calculator by Casio. Widely used by students world-wide due to its great quality for the low price.

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Not working. No display. Better also changed. what should I do?

My Casio fx991 es plus calc not working what should I do? No display battery also changed. Advise me please.

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My Calculator display is gone. How can I repair it

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Not working properly only working solar power not working on

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It is not working and displaying.

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Not working and not displaying

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CASIO fx-991ES not working even though replacement of Battery. But its working with solar. pls suggest any things for resolve.

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same problem occured my casio fx-991es plus. i changed battery same problem occured not turn on my calculator but working while solar. so i opened my calculator i check the wire connection solar wires are connected properly and battery black wire it mean negative line cut down. i fixed that issue now my calculator working finely. thanking you.

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5 opmerkingen:

Can you please tell me How did you you fix the issue

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Same problem can u say me clear procedure

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can you please tell me in what place where the black wire should be connected? thanks in advance

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I had the same issue, replaced battery but still didn't work but it works on the solar panels if flashed with a light source. I opened my unit and what happened to my calcu was the black wire were slightly corroded and a with a touch it suddenly snapped at the soldered point. I soldered in back in place and it came back to life.

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You re lie I am calcalater man I rip all tha calcs thats what us pros call the calcualtors dont worry I can help at all points just come to address here namaste fremnd Dundrum Rd, Friarland, Dublin 14, D14 W0V6

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@shah313 double check to see if there is a reset hole on the back of your calculator. Use a small object to depress the rest button in there. Let us know what you find.

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Thanks for your answer but my calculator still at same position.

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I pressed the button but still, nothing happened.

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Thanks for ur answer my calculator start working

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On the back there will be a “P“ button in the middle. Press it and see if there is a difference.

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I saw that the calculator was solar, so then I took my device and turned up the brightness and faced it to the front of the calculator. It started turning on

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I most likely shouldn’t have been doing my assignment in the dark in the first place ^3^

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As it’s screen is not showing anything; Consult with any technical expert as there may be some internal faults which can’t be solved verbally.

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Same thing also happened with my calc. So i was searching for the reset button but couldn’t find any at the back. So what i did was i tapped the calc around the solar plate area with my fingers three four times and then pressed the power button. And it turned on.

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I dont know how , but your method worked :lol

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I had this problem too I opened my calculator still couldn't figure out what was the problem so what I did was my cal works on solar power as well so I turned my cell phone flashlight on and I held my calc display in front of the light and it worked it's not supposed to work when I light is

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Shahzad zal eeuwig dankbaar zijn.
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