lg_ks20_service_manual.pdf

Table Of Contents

1. INTRODUCTION.................................. 5

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

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

4.13 SIM Detect Troubleshooting ..................115

4.14 Camera Troubleshooting .......................117

4.15 Keypad Backlight Troubleshooting ........120

4.16 Main LCD Troubleshooting ....................121

4.17 Receiver Path ........................................122

4.18 Headset path .........................................124

4.19 Speaker phone path ..............................126

4.20 Main microphone ...................................128

4.21 Headset microphone..............................130

4.22 Vibrator ..................................................132

2. PERFORMANCE ..................................7

2.1 System Overview.........................................7

2.2 Usable environment.....................................8

2.3 Radio Performance......................................8

2.4 Current Consumption.................................14

2.5 RSSI BAR ..................................................14

2.6 Battery BAR ...............................................15

2.7 Sound Pressure Level ...............................16

2.8 Charging ....................................................16

5. DOWNLOAD.....................................133

5.1 KS20 DOWNLOAD..................................133

3. TECHNICAL BRIEF............................17

3.1 General Description ...................................17

3.2 GSM Mode.................................................19

3.3 UMTS Mode...............................................23

3.4 LO generation and distribution circuits ......25

3.5 Off-chip RF Components ...........................25

3.6 Digital Baseband(DBB/MSM7200) ............35

3.7 Hardware Architecture ...............................37

3.8. Subsystem(MSM7200) .............................39

3.9. Power Block..............................................42

3.10. External memory interface......................47

3.11. H/W Sub System ....................................49

3.12. Main Features.........................................76

6. BLOCK DIAGRAM ...........................146

6.1 GSM & UMTS RF Block ..........................146

6.2 Interface Diagram ....................................148

7. Circuit Diagram................................153

8. BGA IC PIN MAP..............................163

8. PCB LAYOUT ...................................169

9. Calibration & RF Auto Test

Program (Hot Kimchi) .....................177

9.1 Configuration of HOT KIMCHI .................177

9.2 How to use HOT KIMCHI.........................180

4. TROUBLE SHOOTING.......................82

4.1 RF Component ..........................................82

4.2 SIGNAL PATH_UMTS RF .........................85

4.3 SIGNAL PATH_GSM RF ...........................86

4.4 Checking VCTCXO Block ..........................87

4.5 Checking Front-End Module Block ............89

4.6 Checking UMTS Block...............................91

4.7 Checking GSM Block.................................96

4.8 Checking Bluetooth Block........................102

4.9 Checking WLAN Block.............................104

4.10 Power ON Troubleshooting ...................108

4.11 Charger Troubleshooting .......................110

4.12 USB Troubleshooting.............................113

10. Phone Test Mode _ 3G smart

Phone KS20 ...................................182

11. EXPLODED VIEW & REPLACEMENT

PART LIST ..................................... 189

11.1 EXPLODED VIEW ................................ 189

11.2 Replacement Parts

<Mechanic component> ....................... 191

<Main component> ............................... 193

11.3 Accessory ............................................. 209

Only for training and service purposes

- 3 -

LGE Internal Use Only

Only for training and service purposes

- 4 -

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 commoncarrier 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.

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.

Only for training and service purposes

- 5 -

LGE Internal Use Only

1. INTRODUCTION

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

- 6 -

Only for training and service purposes

2. PERFORMANCE

2.1 System Overview

Item

Specification

Shape

GSM900/1800/1900 and WCDMA2100 - Bar type Handset

Size

99.8 X 58 X 12.9 mm

Weight

Under 92.5g (with 1050mAh Battery)

Power

3.7 V normal, 1050 mAh Li-Polymer

Talk Time

Over 100 min (WCDMA, Tx=-23 dBm, Voice)

(with 800mAh)

Over 150 min (GSM, Tx=Level 5, Voice)

Standby Time

Over 300 Hrs (WCDMA, DRX=1.28)

(with 800mAh)

Over 400 Hrs (GSM, Paging period=9)

Antenna

Internal type

LCD

Main 2.8” 262K 240 X 320 pixel (TFT)

LCD Backlight

White LED Back Light

Camera

Auto Focus - 2.0 Mega pixel (CMOS) + VGA Video Call Camera

Vibrator

Yes (Coin Type)

LED Indicator

Yes

MIC

Yes

Receiver

Yes

Earphone Jack

Yes (18 pin)

Connectivity

Bluetooth, USB

Volume Key

Push Type(+, -)

External Memory

Yes

I/O Connect

18 Pin

Only for training and service purposes

- 7 -

LGE Internal Use Only

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