I bought a Fujifilm X30 with some problems: many buttons not working, powering on but not off, EVF not working correctly,...
When I received the camera, it worked as advertised.
Following the disassembly guide I managed to tear it down. And I could see it had been on water.
As water lets some white calcium and salts residues over metal contacts.
Then I cleaned every component and connector with isopropyl alcohol and a toothbrush several times.
Even CCD and lens.
I'll had to insist hard on connectors, trying to reach every inner pin.
If water has entered camera lens, I think would have to replace it.
Finally I managed to get everything working!
I even disassembled the EVF lenses to clean them (see my EVF lens teardown). Although I could not fully clear humidity traces on lenses, EVF vision was much better.