RM-994/ RM-995/ RM-996
BB Troubleshooting Guide
NOKIA INTERNAL USE ONLY Page 63
Copyright © 2013 Nokia. All rights reserved.
 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.
The second step is to check that the engine is working normally. This can be done by connecting the phone
to a docking station and starting service software. With the help of service software read the phone
information to check that also the application engine is functioning normally (you should be able to read the
APE ID).
After these checks proceed to the display troubleshooting flowcharts, Use the Care Suite to find the detailed
fault mode.
Pixel defects
Table 5 Display module troubleshooting cases
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.
Pixel defects can be checked by controlling the display with
service software. Use both colors, black and white, on a full
screen. R, G, B are also helpful.
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
(sometimes called on-pixels or stuck-on) are characterized by
the appearance of bright/colored pixels in, for example, black
full screen picture.
(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.
defects are characterized by at least two sub-pixels defects
(bright or dim) being closer than 5 mm to each other.
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