Hardware Keys Troubleshooting - Nokia MOBILE TERMINAL Service Manual

Hardware keys troubleshooting

Context
There are two possible failure modes in the keyboard module:
• One or more keys can be stuck, so that the key does not react when a keydome is pressed. This kind of
failure is caused by mechanical reasons (dirt, rust).
• Malfunction of several keys at the same time; this happens when one or more rows or columns are failing
(shortcircuit or open connection).
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Figure 16 Touch screen basic checks
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