Display module troubleshooting
General instructions for display troubleshooting
The first step is to verify with a working display that the fault is not on the display module itself. The display
module cannot be repaired.
Note: Always use the display with the phone's window while checking the display's visual
functionality.
After this, proceed to the display troubleshooting flowcharts.
Pixel defects
Table 5 Display module troubleshooting cases
Display blank There is no image on the display. The display looks
the same when the phone is on as it does when the
phone is off.
Image on the display not correct Image on the display can be corrupted or a part of
the image can be missing. If a part of the image is
missing, change the display module. If the image is
otherwise corrupted, follow the appropriate
troubleshooting diagram.
Visual defects (pixel) The display may have some random pixel defects
that are acceptable for this type of display. The
criteria when pixel defects are regarded as a display
failure, resulting in a replacement of the display, are
presented in the following table.
Table 6 Pixel defects
Bright sub-pixels (sometimes called on-pixels or stuck-on) are
characterized by the appearance of bright/colored
pixels in, for example, black full screen picture.
Dark sub-pixels (sometimes called off-pixels, stuck-off, or black
pixels) are characterized by the appearance of dark
pixels in white, red, green, or blue full-screen
picture.
RM-824; RM-825; RM-826
BB Troubleshooting Guide
Page 3 – 22 NOKIA INTERNAL USE ONLY Issue 2
Copyright © 2012 Nokia. All rights reserved.
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