User interface troubleshooting
Keypad troubleshooting
Context
There are two possible failure modes in the keyboard module:
• One or more keys are stuck, so that the key does not react when a keydome is pressed. This kind of failure
is caused by mechanical reasons (dirt, rust, mechanical damage, etc.)
• Malfunction of several keys at the same time; this happens when one or more rows or columns in the key
matrix are failing (shortcut or open connection).
If the failure mode is not clear, start with the Keyboard test in Phoenix.
Troubleshooting flow
Display module troubleshooting
General instructions for display troubleshooting
Context
• The display is in a normal mode when the phone is in active use.
• Display is in a partial idle mode when the phone is in the screen saver mode.
Table 4 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.
RM-352; RM-354
BB Troubleshooting and Manual Tuning Guide
Page 3 –16
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