User Interface Troubleshooting; Keyboard Troubleshooting - Nokia 3555 Service Manual

User interface troubleshooting

Keyboard 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 or corrosion).
• Malfunction of several keys at the same time; this happens when one or more rows or columns are failing
(shortcut or open connection).
If the failure mode is not clear, start with the Keyboard test in Phoenix.
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Figure 8 SIM power-up sequence
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