LG U400 User manual

Date: July, 2006 / Issue 1.0
Service Manual Model : U400
Service Manual
U400

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1. INTRODUCTION .............................. 6
1.1 Purpose................................................... 6
1.2 Regulatory Information............................ 6
1.3 Abbreviations .......................................... 8
2. PERFORMANCE............................ 10
2.1 System Overview.................................. 10
2.2 Usable environment.............................. 11
2.3 Radio Performance............................... 11
2.4 Current Consumption............................ 19
2.5 RSSI...................................................... 19
2.6 Battery Bar............................................ 19
2.7 Sound Pressure Level........................... 20
2.8 Charging ............................................... 21
3. Technical Brief .............................. 22
3.1 Digital Baseband(DBB) & Multimedia
Processor.............................................. 22
3.1.1 General Description .........................22
3.1.2 Hardware Architecture .....................23
3.1.3 External memory interface...............27
3.1.4 RF Interface .....................................28
3.1.5 SIM Interface ...................................30
3.1.6 UART Interface ................................31
3.1.7 GPIO (General Purpose Input/Output)
map..................................................32
3.1.8 USB .................................................33
3.1.9 Slider ON/OFF Detection.................35
3.1.10 Bluetooth Interface.........................36
3.1.11 MicroSD Interface card ..................39
3.1.12 Power On Sequence......................40
3.1.13 Key Pad .........................................41
3.2 GAM Hardware Subsystem ...................43
3.2.1 General Description .........................43
3.2.2 Block Description .............................44
3.2.3 Camera & Camera Interface........... 46
3.2.4 Camera Regulator ...........................49
3.2.5 Display & LCD FPC Interface ..........50
3.2.6 LCD Backlight Illumination...............52
3.2.7 Keypad Illumination ........................ 52
3.2.8 Camera Flash LED Illumination .......53
3.3 LCD Module...........................................54
3.4 Analog Baseband (ABB) Processor.......55
3.4.1 Overview of Audio path....................55
3.4.2 Audio Signal Processing &
Interface...........................................56
3.4.3 Audio Mode..................................... 58
3.4.4 Voice Call.........................................59
3.4.5 MIDI (Ring Tone Play) .....................62
3.4.6 MP3 (Audio Player)..........................63
3.4.7 Video Telephony..............................64
3.4.8 Audio Main Component ...................64
3.4.9 GPADC(General Purpose ADC) and
AUTOADC2 .....................................65
3.4.10 Charger control ..............................66
3.4.11 Fuel Gauge ....................................67
3.4.12 Battery Temperature
Measurement.................................68
3.4.13 Charging Part.................................69
3.5 Voltage Regulation.................................72
3.5.1 Internal Regulation...........................72
3.5.2 External Regulation .........................72
3.6 General Description of RF Part..............74
3.7 GSM Mode.............................................76
3.7.1 Receiver...........................................76
3.7.2 Transmitter.......................................81
3.8 WCDMA Mode.......................................83
3.8.1 Receiver.......................................... 83
3.8.2 Transmitter.......................................86
Table of Contents

Table Of Contents
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3.8.3 Frequency Generation .....................90
4. TROUBLE SHOOTING ...................92
4.1 Power ON Trouble .................................92
4.2 USB Trouble ..........................................93
4.3 SIM Detect Trouble................................94
4.4 MicroSD card Trouble............................95
4.5 Keypad Trouble......................................96
4.6 Camera Trouble.....................................98
4.7. Main LCD Trouble...............................102
4.8 Keypad Backlight Trouble....................104
4.9 Camera Flash Trouble .........................106
4.10 Folder ON/OFF Trouble.....................108
4.11 Audio Trouble Shooting .....................110
4.11.1. Receiver......................................110
4.11.2. Speaker ......................................114
4.11.3. Microphone .................................118
4.11.4. Headset Receiver .......................122
4.11.5. Headset MIC...............................123
4.11.6. Headset ......................................124
4.12 Charger Trouble Shooting..................125
4.13 Checking Bluetooth Block..................128
4.13.1 Checking Vincenne2 Block ..........130
4.13.2 Checking Bluetooth Block............131
4.14 RF Component...................................132
4.15 Procedure to check............................134
4.16 Checking Common Power
Source Block......................................135
4.17 Checking VCXO Block.......................141
4.18 Checking Front End Module Block.....146
4.19 Checking Front End Module Block input
logic....................................................147
4.19.1 Mode Logic by TP Command ......147
4.19.2 Checking Switch Block
power source ...............................149
4.20 Checking WCDMA Block ...................156
4.20.1 Checking VCXO Block.................157
4.20.2 Checking Ant. SW module...........157
4.20.3 Checking Control Signal ..............157
4.20.4 Checking RF TX Level.................160
4.20.5 Checking PAM Block ...................164
4.20.6 Checking RX I,Q ..........................166
4.21 Checking GSM Block.........................168
4.21.1 Checking Regulator Circuit ..........169
4.21.2 Checking VCXO Block.................169
4.21.3 Checking Front End Module ........169
4.21.4 Checking Control Signal ..............170
4.21.5 Checking RF Tx Path...................172
4.21.6 Checking RF Rx Path ..................177
5. Download......................................181
5.1 The Purpose of Downloading Software181
5.2 Download Environment Setup .............181
5.3 U400 Download ...................................182
5.3.1. U400 Download(1) - Phone
Model Selection ............................182
5.3.2. U400 Download(2) - FlashRW
configuration. ................................183
5.3.3. U400 Download(3) - Download file
selection........................................185
5.3.4. U400 Download(4) - Connect &
Download......................................186
5.3.5. U400 Download(5) - USB Driver
Install.............................................187
5.3.6. U400 Download(6) -
Trouble shooting ...........................192

Table Of Contents
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6. BLOCK DIAGRAM ........................193
6.1 GSM & WCDMA RF Block...................193
7. CALIBRATION ..............................195
8. Circuit Diagram ............................205
9. CALIBRATION ..............................209
9.1 General Description .............................209
9.2 XCALMON Environment......................209
9.2.1 H/W Environment...........................209
9.2.2 S/W Environment...........................209
9.2.3 Configuration Diagram of Calibration
Environment...................................209
9.3 Calibration Explanation........................210
9.3.1 Overview........................................210
9.3.2 Calibration Items............................210
9.3.3 EGSM 900 Calibration Items .........211
9.3.4 DCS1800 Calibration Items ...........212
9.3.5 PCS1900 Calibration Items ...........213
9.3.6 WCDMA Calibration Items.............214
9.3.7 Baseband Calibration Items...........215
9.4 Program Operation ..............................216
9.4.1 XCALMON Program Overview ......216
9.4.2 XCALMON Icon Description ..........217
9.4.3 Calibration Procedure ....................220
9.4.4 Calibration Result Message...........222
10. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 245
10.1 EXPLODED VIEW ............................ 245
10.2 Replacement Parts
<Mechanic component>.................... 227
<Main component> ........................... 231
10.3 Accessory ......................................... 252

1. INTRODUCTION
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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
network, 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.
1. INTRODUCTION

1. INTRODUCTION
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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.

1. INTRODUCTION
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1.3 Abbreviations
For the purpose of this manual, following abbreviations apply.
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current - Constant Voltage
CLA Cigar Lighter Adapter
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milliwatt
DSP Digital Signal Processing
DTC DeskTop Charger
EEPROM Electrical Erasable Programmable Read-Only Memory
EL Electroluminescence
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GPRS General Packet Radio Service
GSM Global System for Mobile Communications
IPUI International Portable User Identity
IF Intermediate Frequency
LCD Liquid Crystal Display
LDO Low Drop Output
LED Light Emitting Diode
OPLL Offset Phase Locked Loop
PAM Power Amplifier Module
PCB Printed Circuit Board
PGA Programmable Gain Amplifier
PLL Phase Locked Loop

1. INTRODUCTION
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PSTN Public Switched Telephone Network
RF Radio Frequency
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock
SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
UMTS Universal Mobile Telephony System

2. PERFORMANCE
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2.1 System Overview
2. PERFORMANCE
Item Specification
Shape GSM900/1800/1900 & WCDMA Slide type - Dual Mode Handset
Size 99.8 x 48 x 20.4 mm
Weight 114g under (with Standard Battery)
Power 1300mA Li-Polymer
Talk Time Over 184 Min (WCDMA, Tx=12 dBm, Voice)
Over 265 Min (GSM, Tx=Max, Voice)
Standby Time Over 280 hrs (WCDMA, DRX=1.28)
Over 330 hrs (GSM, Paging period=9)
Antenna Intenna type
Main LCD 2.0"(240x320 Dot), 260K TFT Color LCD
Main LCD BL White LED Backlight
Vibrator Yes (Coin Type)
Speaker Yes
MIC Yes (SMD Type)
Receiver Yes
Earphone Jack Yes
SIM Socket Yes(SIM Block Type) : 3.0V & 1.8V
Volume Key Push Type ( + , - )
Voice Key Push Type
External Memory T - Flash Socket
I/O Connect 24 Pin

2. PERFORMANCE
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2.2 Usable environment
1) Environment
2) Environment(Accessory)
*CLA : 12~24V (DC)
2.3 Radio Performance
1) Transmitter - GSM Mode
Item Spec. Unit
Voltage 3.7 (Typ), 3.4 (Min), (Shut Down: 3.23) V
Operating Temp. -20 ~ + 60 °C
Storage Temp. -30 ~ + 85 °C
Humidity max. 85 %
Item Spec. Min Typ. Max Unit
Power Available power 100 220 240 Vac
No Item GSM DCS/PCS
100k ~ 1GHz -39dBm 9k ~ 1GHz -39dBm
MS allocated 1G ~ 1710MHz -33dBm
Channel 1G ~ 12.75GHz -33dBm 1710M ~ 1785MHz -39dBm
Conducted 1785M ~ 12.75GHz -33dBm
1Spurious 100k ~ 880MHz -60dBm 100k ~ 880MHz -60dBm
Emission 880M ~ 915MHz -62dBm 880M ~ 915MHz -62dBm
Idle Mode 915M ~ 1000Mz -60dBm 915M ~ 1000MHz -60dBm
1G ~ 1.71GHz -50dBm 1G ~ 1.71GHz -50dBm
1.71G ~ 1.785GHz -56dBm 1.71G ~ 1.785GHz -56dBm
1.785G ~ 12.75GHz -50dBm 1.785G ~ 12.75GHz -50dBm