User Interface Troubleshooting; Keyboard And Side Keys Troubleshooting - Nokia 6720 Service Manual

RM-424; RM-564
BB Troubleshooting and Manual Tuning Guide

User interface troubleshooting

Keyboard and side keys 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 or a side key 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.
In this phone the keyboard is connected to D2800 I/O pins.
Troubleshooting flow
Issue 1 COMPANY CONFIDENTIAL
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