Nokia N72

Table of Contents
Introduction to camera module troubleshooting...............................................................................................8–5
The effect of image taking conditions on image quality...................................................................................8–6
Image quality analysis ........................................................................................................................................8–10
Testing for dust in camera module...............................................................................................................8–10
Testing camera image sharpness..................................................................................................................8–11
Dirty camera lens protection window..........................................................................................................8–12
Image bit errors..............................................................................................................................................8–12
Camera troubleshooting flowcharts...................................................................................................................8–14
Camera hardware failure message troubleshooting...................................................................................8–14
Camera baseband HW troubleshooting........................................................................................................8–15
Camera viewfinder troubleshooting.............................................................................................................8–16
Bad camera image quality troubleshooting.................................................................................................8–17
Flash LED troubleshooting...................................................................................................................................8–18
Introduction to flash LED troubleshooting...................................................................................................8–18
Flash LED and image taking conditions........................................................................................................8–18
Flash LED construction....................................................................................................................................8–22
Analysing image quality.................................................................................................................................8–23
Possible faults in image quality................................................................................................................8–23
Testing flash module functionality..........................................................................................................8–23
Testing image colours with flash.............................................................................................................8–24
Testing flash power...................................................................................................................................8–24
Flash LED troubleshooting flowcharts..........................................................................................................8–25
Bad image quality when using flash LED.................................................................................................8–25
Flash LED indicator mode troubleshooting.............................................................................................8–25
Flash LED HW baseband troubleshooting................................................................................................8–26
List of Figures
Figure 66 Blurred image. Target too close..........................................................................................................8–6
Figure 67 Blurring caused by shaking hands.......................................................................................................8–7
Figure 68 Near objects get skewed when taking images from a moving vehicle...........................................8–7
Figure 69 Noisy image taken in +70 degrees Celsius.........................................................................................8–8
Figure 70 Image taken against light....................................................................................................................8–8
Figure 71 Flicker in an image; object illuminated by strong fluorescent light................................................8–9
Figure 72 A lens reflection effect caused by sunshine........................................................................................8–9
Figure 73 Good image taken indoors.................................................................................................................8–10
Figure 74 Good image taken outdoors..............................................................................................................8–10
Figure 75 Effects of dust on optical path...........................................................................................................8–11
Figure 76 Image taken with clean protection window....................................................................................8–12
Figure 77 Image taken with greasy protection window.................................................................................8–12
Figure 78 Bit errors caused by JPEG compression.............................................................................................8–13
Figure 79 Example of a good quality image taken with the flash LED...........................................................8–18
Figure 80 overexposed image.............................................................................................................................8–19
Figure 81 Dark and noisy image.........................................................................................................................8–20
Figure 82 Shaken image......................................................................................................................................8–21
Figure 83 Camera white balance failure and overexposure............................................................................8–22
Figure 84 Color difference between flash colour limit samples......................................................................8–22
Figure 85 Mechanical construction of the flash LED module...........................................................................8–23
RM-180
Camera Module Troubleshooting Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 8 –3
Copyright © 2006 Nokia. All rights reserved.