User Guide

RM-11

Troubleshooting - Baseband CC Technical Documentation

Flashlight

GPS Module

Overview

The GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to

determine longitude and latitude of the handset. The GPS circuitry is completely separate

from the CE circuitry and is located almost exclusively on the secondary side of the PWB

underneath the display module (see Figure 38).

Flashlight

faults

Are the flashlight

LEDs turned on

when the phone is

turned and when

pressing the * key?

Measure VBATT

voltage at R315. Is it

OK?

Measure the driver

signal DLIGHT at

V317 an dV301. Is

the signal OK?

Check VBATT line at

X100 connector and

C109

Change the UEM

Check N300, V301,

L300, C302, C303,

C304, R300, R307,

R315, R316, R317

Check solder joints

at V304 and V303. If

bad, replace LEDs

YES

Flashlight

YES