LG GT540 Service Manual.pdf

Internal Use Only

Service Manual

GT540

Date: April, 2010 / Issue 1.0

Table Of Contents

1. Introduction ................................................... 5

1.1 Purpose ......................................................................5

1.2 Regulatory Information.................................................5

4.8 GPS/WIFI/BT Trouble shooting ..................................106

4.9 Power ON Troubleshooting .......................................109

4.10 Charger Troubleshooting ........................................11

4.11 USB trouble...........................................................116

4.12 Audio trouble.........................................................119

4.1 M AF Camera trouble...........................................129

4.14 Main LCD trouble ..................................................12

4.15 SIM Detect Troubleshooting....................................14

4.16 Side Key Troubleshooting .......................................16

4.17 VIBRATOR .............................................................18

4.18 Motion Sensor on/off trouble ..................................140

4.19 Compass Sensor on/off trouble ..............................142

2. performance................................................... 7

2.1 Product Name .............................................................7

2.2 Supporting Standard....................................................7

2. Main Parts : GSM Solution ...........................................7

2.4 HW Features ...............................................................8

2.5 SW Features .............................................................10

2.6 HW SPEC. ................................................................1

3. TECHNnICAL BRIEF....................................... 19

.1 GENERAL DESCRIPTION.............................................19

.2 GSM MODE...............................................................21

. UMTS MODE .............................................................2

.4 GPS RECEIVER ..........................................................26

.5 LO GENERATION and DISTRIBUTION CIRCUIT ..............27

.6 OFF-CHIP RF COMPONENTS ......................................28

.7 Digital Baseband(DBB/MSM7227) ..............................4

.8 Hardware Architecture ...............................................5

.9 Subsystem (MSM7227) .............................................9

.10 Power Block............................................................42

.11 External memory interface .......................................48

.12 H/W Sub System .....................................................50

.1. Audio and sound.....................................................58

.14 Display ...................................................................65

.15 Motion Sensor.........................................................67

.16 Vibrators .................................................................68

.17 Compass Sensor .....................................................69

.18 Main Features .........................................................70

5. Download ................................................... 144

6. Block diagram............................................ 157

7. Circuit Diagram.......................................... 165

8. BGA Pin Map .............................................. 177

9. PCB Layout ................................................. 181

10. Calibration & RF Auto Test Program

(Tachyon).................................................. 191

12. Exploded view & Replacement part list . 207

12.1 Exploded view .......................................................207

12.2 Replacement Parts ................................................209

12. Accessory .............................................................25

4. Trouble Shooting .......................................... 78

4.1 RF Component ..........................................................78

4.2 SIGNAL PATH ............................................................80

4. Checking TCXO Block ................................................84

4.4 Checking GSM TX Module(GSM PAM+FEM) BLOCK.....86

4.5 Checking WCDMA Block ............................................89

4.6 Checking GSM BLOCK ...............................................99

4.7 GPS/WIFI/BT RF COMPONENTS................................104

Only for training and service purposes

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LGE Internal Use Only

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Only for training and service purposes

1. Introduction

1.1. Purpose

This manual provides the information necessary to repair, calibration, description and download the features of this

model.

1.2. Regulatory Information

A. Security

Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example, persons other

than your company’s employees, agents, subcontractors, or person working on your company’s behalf) can result in

substantial additional charges for your telecommunications services. System users are responsible for the security of

own system. There are may be risks of toll fraud associated with your telecommunications system. System users are

responsible for programming and configuring the equipment to prevent unauthorized use. The manufacturer does

not warrant that this product is immune from the above case but will prevent unauthorized use of common carrier

telecommunication service of facilities accessed through or connected to it. The manufacturer will not be

responsible for any charges that result from such unauthorized use.

B. Incidence of Harm

If a telephone company determines that the equipment provided to customer is faulty and possibly causing harm

or interruption in service to the telephone network, it should disconnect telephone service until repair can be done.

A telephone company may temporarily disconnect service as long as repair is not done.

C. Changes in Service

A local telephone company may make changes in its communications facilities or procedure. If these changes could

reasonably be expected to affect the use of the phones or compatibility with the net work, the telephone company

is required to give advanced written notice to the user, allowing the user to take appropriate steps to maintain

telephone service.

Only for training and service purposes

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LGE Internal Use Only

1. Introduction

D. Maintenance Limitations

Maintenance limitations on the phones must be performed only by the manufacturer or its authorized agent. The

user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that

unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining

warranty.

E. Notice of Radiated Emissions

This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory

agencies. In accordance with these agencies, you may be required to provide information such as the following to

the end user.

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different.

G. Interference and Attenuation

A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from

unsuppressed engines or electric motors may cause problems.

H. Electrostatic Sensitive Devices

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the

sign. Following information is

ESD handling:

• Service personnel should ground themselves by using a wrist strap when exchange system boards. • When repairs

are made to a system board, they should spread the floor with anti-static mat which is also grounded.

• Use a suitable, grounded soldering iron. • Keep sensitive parts in these protective packages until these are used.

• When returning system boards or parts like EEPROM to the factory, use the protective package as described.

LGE Internal Use Only

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Only for training and service purposes

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