Casio Fx-CG20 backlight not working

Thread Starter

dkeplar

Joined Nov 16, 2020
3
Hello everyone, as the title mentioned i own a Casio Fx Cg-20 which i use in my classes and it's backlight is not working. The screen itself is working as i can see it working with enough ambient light. The brightness setting is obviously useless here. Batteries are fresh too. Does anyone have experience with these things or can maybe identify the problem just by looking at the board? I should add that the backlight works occasionally, for example, it worked for like 15min. after i put fresh batteries and it also sometimes worked when i took out the old batteries and put them again. The calculator also showed 2/3 battery before i replaced them so battery problem is out of the way i think. Thanks in advance.IMG_20201116_193750.jpgIMG_20201116_194035.jpgIMG_20201116_194050.jpg
 

Thread Starter

dkeplar

Joined Nov 16, 2020
3
Holy hell i think i've just solved it... I think this is my luck of the year. I'm sorry if i wasted anyone's time but i will still leave this here for anyone with the same problem in the future.

So, in my understanding that big connector uptop is what connects to the screen itself, and that little 2 pin connector is what powers the backlight as far as i know. Mine was a little raised and i thought it was normal, i tried pushing it down anyway by hand and put it back together and still didn't work. There's no way to test things since the batteries have to be off to access the back btw. So what i did was to put a little piece of toilet paper stuck on the back piece (check attached files) and it's working. I took the batteries out and put them back in a couple of times, restarted it and it's still working.
 

Attachments

Skeeve

Joined Nov 29, 2020
2
Is this the month of broken CG20s? My son's CG20's display light is also broken I learned today and your fix doesn't seem to help here :(
 

Skeeve

Joined Nov 29, 2020
2
Correction: I gave it a second try using toilet paper instead of normal paper. IT WORKED.

Thanks for your tip.

Nevertheles, I'll try and get it repaired after his maths exam.
 
Top