Phone Display - Nokia RM-824 Service Manual

RM-824; RM-825; RM-826
Camera Module Troubleshooting
Figure 19 Noisy image taken in +70 degrees Celsius

Phone display

If the display contrast is set too dark, the image quality degrades: the images may be very dark depending
on the setting. If the display contrast is set too bright, image contrast appears bad and "faint". This problem
is solved by setting the display contrast correctly. This is normal behaviour; do not change the camera module.
Basic rules of photography (especially shooting against light)
Because of dynamic range limitations, taking images against bright light might cause either saturated image
or the actual target appear too dark. In practice, this means that when taking an image indoors and having,
for example, a window behind the object, the result is usually poor. This is normal behaviour; do not change
the camera module.
Figure 20 Image taken against light
Flicker
In some occasions a bright fluorescent light may cause flicker in the viewfinder and captured image. This
phenomenon may also be a result, if images are taken indoors under the mismatch of 50/60 Hz electricity
network frequency. The electricity frequency used is automatically detected by the camera module. In some
very few countries, both 50 and 60 Hz networks are present and thus probability for the phenomenon
increases. Flickering occurs also under high artificial illumination level. Flickering only occurs when the rolling
shutter is used. This is normal behaviour; do not change the camera module.
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