On all of my photos, especially ones taken outside, there are 4 or 5 distinct small dark spots/dots where it looks like there must be something on my image sensor. We live in Hawaii and we're at the beach often so I'm sure sand is quite a possibility! But to me it looks more like a water spot or something. I've tried air can, soft brush, micro-fiber cleaning cloths....Nothing will work. I can't get to it at a very good angle b/c the function I'm suppsed to be able to use to move it for cleaning does NOT exist. Do I need to take it in somewhere to be professionally cleaned? Where does that? And is it terribly expensive? Or is there something else that will work? It's getting really old having to edit EVERY photo haha!
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I hate to say it but what this is is contamination under the actual LCD glass. This propblem starts during the manufacturing process and can rear its ugly head over time or after running at high temperatures for long periods of time. It can also appear as dark 'tiger' stripes. There is nothing that can be done to repair this. If you have an extended warranty, the mfg should exchange the panel for you. If your warranty is up, take photos and contact Toshiba online and try to get them to cover this regardless. This is a mfg defect.
Does the camer have a removable lens. Is it an SLR camera. If so, there probably is microscopic dust on your sensor, or you have some dead pixels on your sensor. If you can get to the sensor, you can easily clean it with a cleaning kit. The most effective way of cleaning is to blow it off with clean air. Be gentle. On an SLR it is necessary to lock the mirror up. Your instruction book will explain how to do that. For more suggestions, Google cleaning my camera sensor and you will get a lot of suggestions. :-)
If by saying the upper right corner of the lens you really mean that there is a dark spot on each image AND the rear display, there may be dirt or dust on the lens itself. Clean the lens with an optical quality cleaner. Do not use paper towels and Windex or the like - as paper towels can scratch the lens.
It is also possible that the dark spot is a "stuck pixel" on the image sensor inside the camera. There is no way to repair a stuck pixel outside of replacing the sensor. Any dark spot (regardless of source) can be edited out by using image editing software. This will allow you to to make the dark spot less noticeable - or practically invisible.
If the dark spot is on the rear display only, it can also be a result of a "stuck pixel" on the display itself. This should not show up an images, but only on the display. There is little that can be done outside of replacing the entire rear screen.
There are other things that can cause these problems, but those listed above are the most common.
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.