How to fix an old HP41cx

[brmarcant]

Hi all,

I got an old HP41CX that is working partially. It’s difficult to power on, it powers on randomly pressing the on button. Keyboards works partially and also there randomly. LCD sometimes changes brightness an suddenly disappear. I think the calculator has been already opened and probably need a full verification, cleaning and tightening of all screws. But It m afraid to broke something in such a fragile calculator. Is there any tutorial/suggestions I can follow to make this work well done ?

Thanks

Bruno