No Audio; Key Pads Malfunction; No Lcd Display - Nokia 3155i Troubleshooting Manual

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Table of Contents

3155/3155i (RM-41), 3152 (RM-61)

Baseband Description and Troubleshooting

No Audio

• Check for bad contacts or damaged earpiece

• Check for bad connections at mic

• Check for broken or bad solder joint of passive components

• Verify the audio signal paths using BaseBand "audio test" component with

Phoenix as described in the troubleshooting guide

• Check for protective film left on back of the key dome if a new one was installed

• Check for corrosion on both the key pads and key dome

• Check if flash software was corrupted

• Check for bad joint from UPP to Interface

• Check for pins shorted on or bad on Z300

• Check for bad connections

• Check for a cracked or damaged display

• Probe test points as described in the troubleshooting guide for missing for

incorrect signal level

Page 40

Company Confidential

ISSUE 1 07/2005

Table of Contents

3155 3152