Chosen Solution

Why is my zero key not working?

Hi There are a couple reasons for why your 0 key isn’t working ,here they are!

  1. the most common reason:under the key the membrane has gotten dislodged or dirty so you should clean the board and membrane with some isopropyl alcohol to potentially restore functionality
  2. it could be caused by a loose connection or a broken trace:to check for a loose connection get a fine probe and gently nudge all the legs on the bigger chips and pay attention for corrosion,to find a broken trace look for any dark spots on the little sines that go all over the main board Here’s a video that should help https://m.youtube.com/watch?v=ref9JHUf-u… To try these methods you will have to take the calculator apart by following this video guide https://m.youtube.com/watch?v=d8DzQoj4wp… Unfortunately there aren’t many guides on taking the full thing apart so you might have you take some screws out and see where it takes you:-) Hopefully this helps Any questions please ask Thanks:-)