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Most lenses can be unscrewed internally but you have to remove the plastic bezel on the front of the lens. it is a thin plastic ring around the glass that covers the internal threads of the lens barrel. If the loose element is in the rear, it may unscrew from that end. Not really a job for a novice but can be done if the lens is useless as is, no harm to try. If it is an expensive lens, you may want professional help. If the lens is not removeable (bridge camera) you can try through the front.
Might it be the lens? The exposed portion of the lens do get covered with grime and dirt, maybe not much but when used, it gets baked because of the heat from the lamp. Cleaning it by wiping is not enough. You have to use a solvent to really clean it. One thing to remember is to clean it when it is at room temp and not after use (even a short one). The sudden change in temp is not that healthy for the lens. Since you were able to change the lamp, perhaps you can also do the inside portion of the lens. Treat it like your eyeglasses or the windshield of your car. Sometimes you really have to rub on it hard to remove the stains and smears.
Hope this be of some help/idea. Post back how things turn up or should you need further information.
Good luck and kind regards.
this can be a doozy, but if you are up to it, remove the top cover, you may have to remove the rear, front and maybe sides, i don't know, but what you are after is the cover over the top of the lens. take that off and use air to blow it out--don't touch anything, just blow. several bursts then quickly replace the cover over the lens assy. if used in a dusty environment or ceiling mounted, you may have to do this as needed.
I have just had exactly the same thing on my daughter's NV3.
In this case the lens cover would not open but if you power on the camera with you finger on the display button you can view stored images.
If the lens cover is jammed you need to open the casing and maybe take the lens cover assembly apart. You need a very small cross head screwdriver (No.00 should be OK). There are 5 screws in total, 4 screws on the outside of the case (3 plus1 under the headphone socket cap) and 1 inside the battery compartment. You need to remove all 5 to remove the camera front casing. There are some retaining springs top and bottom on the front cover, gently prize off to reveal the lens cover assembly.
Check to see if the lens cover will operate by switching on and off - if it works then the camera front casing is preventing it from opening and is probably bent out of shape. A little careful bending back into shape should resolve the problem. If it still does not work with the casing removed, read on.
This is the tricky part. There are two extremely small, black retaining screws to the left hand side which hold the assembly onto the lens cover motor. Remove these screws and the front of the lens cover assembly to reveal the lens cover and the back plate of the assembly.
Lift off the lens cover and switch on the camera. If the motor is still working, you will see a short black peg move from side to side as you turn the camera on and off. Thoroughly clean the lens cover and assembly, remove any obstruction and replace the lens cover making sure you locate the hole in the lens cover over the motor peg (described above).
The motor is magnetic and will attract the screws away from their holes if you replace the assembly front straight away, so when you replace the front of the lens cover assembly, place the screws in the correct holes before lowering it into place and then screw onto the motor/assembly back.
Test that the lens cover opens and closes and replace the Camera front cover taking care not to bend it too much - if this becomes distorted it can stop the lens cover from operating resulting in the same problem.