I had the same issue.
For me, cleaning off the button circuit board restored all buttons to working order. When it is disassembled, and after cleaning, you could flip the board, display, etc. up and out of the case and test to see if it works as well.
These steps worked to fix my TI-30X IIS! There is one additional one though. Between Mark's steps 3 and 4, you need to use a razor blade to carefully shave off the tops of the melted plastic rivets that hold the button circuit board to the front of the calculator.
Be careful after this is done as when the button circuit board comes up the buttons will be loose. If you keep the calculator upside down and don't bump it you're fine. If some of the buttons fall out, just look up an image of the calculator to figure out where they all go.
I also didn't have any electrical cleaner, but instead used 91% Isopropyl Alcohol which is safe to clean electronics with. You just dip a q-tip into it then rub the q-tip on the board. Let it air dry (it'll be quick).
For the rubber pad between the plastic buttons and button circuit board I just cleaned it with a kitchen cleaning wipe, then thoroughly dried it with a paper towel.
This worked on my 42 year old TI-30 III calculator. I took it apart, used 70% isopropyl alcohol and Q-tips to clean the circuit board, washed all the plastic parts with soap and water, let everything dry, and reassembled. works like a charm, now! Thanks for the instructions, Mark and Brian!!!
×
Sounds like you have a shorted out circuit card. Try replacing the batteries first to see if the power returns to the keys. If that doesn't work, you will find it cheaper to find a replacement calculator vs sending it to an authorized factory repair center. Hope this helps.
5,064 views
Usually answered in minutes!
×