User Guide

Baseband troubleshooting overview

This section is intended to be a guide for localising and repairing electrical faults.

The table below tells you what troubleshooting to go to.

Problem Troubleshooting

Abnormal current consumption 1 General power checking (page 3–6)

2 Battery current measuring fault (page 3–6)

Flashing does not work or the problem is not clearly

defined

1 Flashing (page 3–11)

2 Clocking (page 3–9)

3 Combo memory (page 3–10)

Charging does not work Charging (page 3–8)

Display does not work Display fault (page )

Backlights do not work 1 Backlight (page 3–18)

2 LED driver (page 3–19)

USB does not work USB (page 3–38)

Audio (mic, earpiece, IHF) does not work 1 Audio (page 3–21)

2 Acoustics (page 3–21)

Bluetooth does not work Bluetooth (BT) (page 3–32)

MicroSD card does not work MicroSD card (page )

IrDA does not work IrDA (page 3–20)

RM-274

BB Troubleshooting and Manual Tuning Guide

Issue 1 COMPANY CONFIDENTIAL Page 3 –5