Trouble Shooting Guide.pdf

Trouble Shooting Guide, Mechanical

Applicable for K550i, K550c & K550im

Contents

General ................................................................................................................................. 3

Power Problems.................................................................................................................... 4

Network/Signal Problems...................................................................................................... 5

Audio Problems..................................................................................................................... 6

Microphone: ................................................................................................................... 6

Receiver:........................................................................................................................ 6

Rear Speaker:................................................................................................................ 8

Key Problems...................................................................................................................... 10

Keyboard: .................................................................................................................... 10

Navigation Key:............................................................................................................ 10

Numeric Keyboard: ...................................................................................................... 11

Volume key: ................................................................................................................. 11

Music Player Key: ........................................................................................................ 12

Power Key: .................................................................................................................. 13

Camera Key:................................................................................................................ 14

Display Problems ................................................................................................................15

Illumination Problems.......................................................................................................... 17

Keyboard Illumination: ................................................................................................. 17

Navigation Key Illumination: ........................................................................................ 17

Display Illumination:..................................................................................................... 17

Alert Problems..................................................................................................................... 18

Vibrator: .......................................................................................................................18

Rear speaker: .............................................................................................................. 19

Charging/Capacity Problems .............................................................................................. 21

Rear Camera Problems ...................................................................................................... 22

IR Problems ........................................................................................................................ 25

SIM Problems...................................................................................................................... 25

Data Transfer Problems using a Data Cable ...................................................................... 26

Bluetooth Problems............................................................................................................. 26

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Trouble Shooting Guide , Mechanical

Memory Stick Problems ...................................................................................................... 27

Hands-Free Problems ......................................................................................................... 27

Revision History .................................................................................................................. 28

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Trouble Shooting Guide , Mechanical

1 General

This document outlines the mechanical repairs that should be made in an attempt to fix the common failures that are seen in the

field. To gain a complete understanding of how to test and repair a unit, this document should be used in conjunction with the Test

Instructions, Mechanical and the Working Instructions, Mechanical.

NOTE! A unit should always be inspected for liquid damage and flashed with latest software before using the

Mechanical Trouble Shooting Guide. Refer the Mechanical Test Instructions for details regarding inspecting

for liquid damage and upgrading software.

NOTE! The camera flash should always be discharged before performing any disassembly. Refer to the ÐGeneralÑ

section of the Mechanical Working Instructions for a detailed procedure for discharging the camera flash.

NOTE! If all of the repair actions listed in this document for addressing a problem have been preformed and a unit still

is not working, handle the unit according to your local company directives

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Trouble Shooting Guide , Mechanical

2 PowerProblems

Problem Area Items to Inspect

Repair Action

Inspection Reference

Unit will not

Power On

Check whether the keyboard

illuminates 15 to 20 seconds after

pressing the power key

If illumination of the keyboard is detected,

refer to the ÐDisplay ProblemsÑ section

Inspect battery connector

• If dirty or oxidized Î Clean

• If damaged Î Send to an electrical

repair location

Inspect the power key and the power

keyÓs switch

• Make sure the power key is properly

positioned in the phone.

• If dirt or debris is detected Î Clean

both the key and the switch

• If the key is damaged Î Replace it

• If the switch is damaged Î Escalate to

an electrical repair level

If the issue is still not resolved ã

• Escalate to an electrical repair level

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Trouble Shooting Guide , Mechanical

3 Network/SignalProblems

Problem Area Items to Inspect

Repair Action

Inspection Reference

No Signal or Poor

Signal

Inspect SIM holder

• If dirty or oxidized Î Clean

• If damaged Î Escalate to an electrical

repair level

If the issue has not been resolved ã • Clean the antenna-to-board

connectors on the circuit board and

replace the antenna/speaker box

assembly

If the issue is still not resolved ã

• Escalate to an electrical repair level

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