Worth The Risk Disassembling Broken Tima KK402 Calculator

I had a broken Tima KK402 calculator which is now only a few bucks. Therefore, it is worth the risk of disassembling since there is almost nothing to lose as I can always buy a new calculator. In fact, the experience of disassembling it is worth it. Anyone can know if the problem is the cable is cut. Although I have an advantage of able to identify disconnected cable using multimeter even if it seemed to be intact and know the optimal way to connect or replace them since I had a background in electrical engineering.

Many beginners would probably disassemble every detail part but there is a step before that that is risk free of making it permanently broken. That is to just clean and give it a try whether it is fixed or not. Dirt and dust can contribute to the malfunction of electric circuits. Unfortunately for me, this step is not enough.

Then I checked the printed circuit board (PCB) and found that it was not aligned well with the buttons. After examining the surroundings, some of the…