Flash Led Troubleshooting; Introduction To Flash Led Troubleshooting; Flash Led And Image Taking Conditions - Nokia 6680 RM-36 Service Manual

RM-36
Camera Module Troubleshooting Nokia Customer Care

Flash LED troubleshooting

Introduction to flash LED troubleshooting

A fault or complaint associated to LED flash operation can be roughly categorized to two subgroups:
1 Flash is not functional at all (no light output at all).
2 Images can be taken and they are recognizable but for some reason the quality of images is seriously
degraded.
Image quality is very hard to measure quantitatively, and even comparative measurements are difficult
(comparing two images) if the difference is small. Especially if the user is not satisfied with his/her devices'
image quality, it is fairly difficult to accurately test the device and get an exact figure which then would tell if
the device is OK or not.
Most often, subjective evaluation has to be used for finding out if there is something wrong in the flash. Some
training or experience of a correctly operating reference device may be needed in order to detect what actually
is wrong, or is there anything wrong at all. It is easy for the user to take bad looking images in bad conditions;
thus the camera and the flash operation has to be checked always in constant conditions (lighting, temperature)
or by using a second, known to be good device as a reference. Experience significantly helps in analyzing image
quality.

Flash LED and image taking conditions

This section describes some of the factors, which may cause poor image quality if not taken into account by the
end user when shooting pictures, and thus may result in complaints. The described items are normal to the
camera and LED flash operation and do not cause a need for e.g. changing the flash module.
Figure 91 Example of a good quality image taken with the flash LED
Issue 1 Company Confidential Page 8–25
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