I have the Dimage Z 1 that had the same viewfinder problem. It was stuck and I could not use the small viewfinder. I couldnt hear any loose parts so after looking at a diagram of the viewfinder I turned the camera upside down, shook it and thumped it a couple of times. I only did this becouse I would like a new camera and was NOT WORRIED about breaking it futher. Long story short.....the viewfinder was " stuck" not broken. It works fine now but i look foward to more problems so I can slap it around some more.
My dimage z5 and see alot of problems on ebay the net ....anyways being a tech for 25 years the cover came right off and u can see the switch is surface mounted. there is supposed to be a plastic lever coming out to manually engage to outer switch but missing ...upon closer inspection i could see alot busted up chards of small plastic ...the insideof the switch was completely ruined for bits where falling out...its just stuck in main veiwfinder. cant find the part itself anywhere on net. heard sony bought out minolta. my only bet is buy a broken camera with different prob. on ebay. Larry
Usually answered in minutes!