I had this same issue and tried to insert a thin transparent film between the glass and eyecup, but no luck.
..but blowing compressed air from a can worked. There was no visible dust/dirt in front of the sensor, but maybe there was some dirt between the glass and the eyecup that got blown away.. who knows, but now it works.
omg thanks Archiebald, i cleaned with alcohol and water and whatever i could get my hands on, the glass was super clean but it still did not work. now i blowed on it and voila it works again!! I can not believe it, there really has to be a problem with dirt somewhere between the parts. thanks a bunch.
Eye Sensor won't switch to LCD from EVF
in Fuji X-T1 / Fuji X-T10
Posted
omg thanks Archiebald, i cleaned with alcohol and water and whatever i could get my hands on, the glass was super clean but it still did not work. now i blowed on it and voila it works again!! I can not believe it, there really has to be a problem with dirt somewhere between the parts. thanks a bunch.