User Guide

Table of Contents
Camera module troubleshooting..........................................................................................................................5–5
Introduction to camera module troubleshooting .........................................................................................5–5
The effect of image taking conditions on image quality..............................................................................5–6
Image quality analysis ....................................................................................................................................... 5–11
Possible faults in image quality.................................................................................................................... 5–11
Testing for dust in camera module .............................................................................................................. 5–11
Testing camera image sharpness................................................................................................................. 5–12
Effects of dirty or defective camera lens protection window.................................................................... 5–13
Faulty pixels in images .................................................................................................................................. 5–15
Flash photography problems........................................................................................................................ 5–16
Camera construction...................................................................................................................................... 5–16
Main (back) camera troubleshooting flowcharts............................................................................................. 5–18
Main camera troubleshooting....................................................................................................................... 5–18
Main camera HW failure troubleshooting.................................................................................................... 5–19
Secondary camera HW BB troubleshooting................................................................................................. 5–19
No recognizable viewfinder image .............................................................................................................. 5–21
Bad camera image quality troubleshooting................................................................................................ 5–22
Camera autofocus troubleshooting.............................................................................................................. 5–23
LED flash troubleshooting ............................................................................................................................. 5–24
List of Figures
Figure 17 Only center part of image is in focus due to limited depth of focus ...............................................5–6
Figure 18 Blurring caused by shaking hands ......................................................................................................5–7
Figure 19 Near objects get skewed when taking images from a moving vehicle...........................................5–7
Figure 20 Noisy image taken in +70 degrees Celsius .........................................................................................5–8
Figure 21 Image taken against light....................................................................................................................5–8
Figure 22 Flicker in an image; object illuminated by strong fluorescent light................................................5–9
Figure 23 A lens reflection effect caused by sunshine........................................................................................5–9
Figure 24 Good image taken indoors................................................................................................................ 5–10
Figure 25 Good image taken outdoors ............................................................................................................. 5–11
Figure 26 Effects of dust on optical path .......................................................................................................... 5–12
Figure 27 Image taken with clear protection window ................................................................................... 5–14
Figure 28 Image taken with greasy protection window ................................................................................ 5–14
Figure 29 Image of point light sources taken with a clean protective window........................................... 5–15
Figure 30 Image of point light sources taken with a dirty (finger print) protective window .................... 5–15
Figure 31 Enlargement of a hot pixel................................................................................................................ 5–16
Figure 32 Light from the flash has reflected on particles in front of the camera ........................................ 5–16
Figure 33 Exploded view of the camera module (without sensor array and PWB shown)......................... 5–17
Figure 34 Camera module top and bottom views including imaginary view cone ..................................... 5–17
RA-6
Camera Module Troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 5 –3
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