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Your DMD chip is failing, the only fix is to replace the chip.
Also if you do replace the chip make sure you use decent thermal paste between the chip and heat sink, and clean all the dust out, especially from the fans.
Clean the lens inside and out (but do not disassemble the lens assembly), and clean the internal LCD panel. If this doesn't help, then the LCD may have defective pixels.
This is caused by dust on the lens assembly. If you can remove the lens, clean the surfaces with a lens cloth. That should resolve the problem. It is possible that the there is dust in the optical pathway inside the unit as well. If the cleaning of the lens does not resolve the problem, the unit should be brought in for a professional cleaning. It is not suggested that anyone open up these units as there are fine adjustments that can be changed internally easily that could result in convergence problems.
If these are like "bubble" spots and they appear in different places on each photo, I'm guessing you're shooting flash pictures indoors. The spots are dust particles in the air reflecting the flash. This happens on small point-and -shoots because the flash is almost in the same plane as the lens.
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.
Initially, this would be a temperature imbalance on the CCD lens. Often white spot(s) appear at night or when the temperature is cold. Workaround is to open the lens but delay taking a picture after a few seconds. The idea is allow the lens to match the ambient temperature.
If this white spot is always exactly the same, but moves off the picture when you start to digital zoom and not optical zoom, there is probably something on the sensor. You mentioned that when zooming, eventually it moves. Are you in digital zoom mode at that time? (The switchover from optical to digital zoom is automatic, but you can disable it). Is this white spot blurry or sharp? Can you see fringes of the image at the edges? (This would suggest something on the lens).
If there is a piece of dust inside the lens ,you may be able to see it looking down the lens. How big is this spot?
Either way, if the camera is new, can you still return it?
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