User Guide

• Dirty camera protection window (page 5–14)

Dirty camera lens protection window

The following series of images demonstrates the effects of fingerprints on the camera protection window.

It should be noted that the effects of any dirt in images can vary much. It may be difficult to judge whether

the window has been dirty or if something else is wrong. Therefore, the cleanness of the protection window

should always be checked and the window should be wiped clean with a suitable cloth.

Figure 44 Image taken with clean protection window Figure 45 Image taken with greasy protection window

Image bit errors

Bit errors are image defects caused by data transmission errors between the camera module and the phone

baseband and/or errors inside the module.

Usually bit errors can be easily detected in images, and they are best visible in full resolution images. A good

practice is to use a uniform white test target when analysing these errors. The errors are clearly visible,

colourful sharp dots or lines in camera images. See the following figure.

Figure 46 Bit errors caused by JPEG compression

One type of bit error is a lack of bit depth. In this case, the image is almost totally black under normal

conditions, and only senses something in very highly illuminated environments. Typically this is a contact

problem between the camera module and the phone main PWB. You should check the camera assembly and

connector contacts.

If the fault is in the camera module, bit errors are typically visible only when using some specific image

resolution. For example, in case of a viewfinder fault, the error might exist but is not visible in a full size

image.

Note: At the most 5 clusters of black dots or blemish are not considered errors, and no reason to

replace camera module

RM-244

Camera Module Troubleshooting

Page 5 –14 COMPANY CONFIDENTIAL Issue 1