User Guide

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.

• The operating modes of the display can be controlled with the help of

Phoenix

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. The backlight can be on in some cases.

RM-265

BB Troubleshooting and Manual Tuning Guide

Page 3 –18 COMPANY CONFIDENTIAL Issue 1