No setting can cause white spots on the picture, this is a fault.
By the way you can reset settings on this camera to initial state by simply removing and putting back camera batteries.
Alternatively you should have a reset command on camera settings menu.
My opinion is that this is a fault and not a settings problem.
Typically there are three kind of faults that can cause this problem:
1 - Dirty lens or water inside the lens:
The
lens may be dirty inside, for example because of water condensation on
internal surfaces, this will cause blurred dots or black dots. The lens
must be taken apart and cleaned in this case.
2 - Defective CCD sensor.
The
CCD sensor is the chip that detects the picture, if you get well
defined white or colored spots on picture that is probably a defective
CCD. I think this is the more likely in your case. To fix this the
sensor must be replaced.
3 - Defective video chip on internal board.
This can cause any kind of problems, however it is quite unlikely.
It is an expensive repair.
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