User Guide

• The operating modes of the display can be controlled with the help of Phoenix .
Table 7 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. The backlight can be on in some cases.
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) Pixel defects can be checked by controlling the
display with Phoenix. Use both colours, black and
white, on a full screen.
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 the following table.
Table 8 Pixel defects
Item White dot defect Black dot
defect
Total
1 Defect counts R G B White Dot
Total
1 1
1 1 1 1
2 Combined
defect counts
Not allowed.
Two single dot defects that are within 5 mm of each other should be
interpreted as combined dot defect.
Steps
1. Verify with a working display that the fault is not on the display module itself.
The display module cannot be repaired.
2. Check that the cellular engine is working normally.
i To check the functionality, connect the phone to a docking station.
ii Start Phoenix service software.
iii Read the phone information to check that also the application engine is functioning normally (you
should be able to read the APE ID).
3. Proceed to the display troubleshooting flowcharts.
Use the Display Test tool in Phoenix to find the detailed fault mode.
RM-396
BB Troubleshooting and Manual Tuning Guide
Page 3 –20 COMPANY CONFIDENTIAL Issue 1
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