Main
Table Of Contents
1. INTRODUCTION .............................. 5
2. PERFORMANCE...............................7
3. TECHNICAL BRIEF ........................17
4. TROUBLE SHOOTING ...................73
Page
1. INTRODUCTION
1. INTRODUCTION
1.1 Purpose
1.2 Regulatory Information
A. Security
1. INTRODUCTION
2.1 System Overview
2. PERFORMANCE
2.2 Usable environment
1) Environment
2) Environment (Accessory)
2.3 Radio Performance
1) Transmitter - GSM Mode
Page
Page
2) Transmitter - WCDMA Mode
3)Receiver - GSM Mode
4) Receiver - WCDMA Mode
2.4 Current Consumption
1) U250/KU250 Current Consumption
2.5 RSSI BAR
2.6 Battery BAR
2.7 Sound Pressure Level
2.8 Charging
3.1 General Description
3. TECHNICAL BRIEF
Page
3.2 GSM Mode
3.2.1 GSM Receiver
Page
Page
3.2.2 GSM Transmitter
3.3 UMTS Mode
3.3.1 Receiver
3.3.2 Transmitter
Page
3.4 LO generation and distribution circuits
PA_R0
- 25 -
3.5 Off-chip RF Components
3.5.1 WCDMA PAM (U103: WS2512-TR1G)
3.5.2 VCTCXO (X100 : DSA321SCE-19.2M)
3.5.3 Front-End Module (U500 : D5011)
3.5.4 PMIC Functional Block Diagram (U300 : PM6650-2M)
Page
Page
3.5.5 GSM PAM (U101 : SKY77318)
GSM_PA_RA
GSM_PA_EN
GSM_PA_BAND
SKY77318
3.5.6 UMTS Duplexer(FL104:ACMD-7602)
3.5.7 UMTS Rx RF filter (FL103 : EFCH2140TDE1)
3.5.8 Bluetooth (M100 : LBRQ-2B43A)
3. BB Technical Description
3.6 Digital Baseband(DBB/MSM6245)
3.6.1 General Description
A. Features(MSM6245)
- 35 -
MSM6245
PM6650 -2M
GSM VCO
GSM Block
WCDMA Block
MSM6245
PM6650
NAND Flash 512Mbit
SDRAM 512Mbit
LCD (1.76inch)
3.8 Subsystem(MSM6245)
3.8.1. ARM Microprocessor Subsystem
3.8.2. WCDMA R99 features
3.8.3. GSM features
3.8.4. GPRS features
3.8.5. EDGE features
3.8.6. MSM6245 device audio processing features
3.8.7. MSM6245 microprocessor subsystem
3.8.8. Supported interface features
3.8.9. Supported multimedia features
Page
Page
3.8.10. Stereo Wideband CODEC
3.8.11. Vocoder Subsystem
3.8.12. ARM Microprocessor subsystem
3.8.13. Mode Select and JTAG Interfaces
Page
3.9 Power Block
3.9.1. General
3.9.2. PM6650
Page
3.9.3. Charging control
Trickle Charging
Constant Current Charging
Constant Voltage Charging
3.10 External memory interface
EBI1 EBI2
3.11 H/W Sub System
3.11.1. RF Interface
RF
Figure 1.15 Schematic of RF Interface of MSM6245
- 52 -
B. the others
3.11.2. MSM Sub System
MSM6245 PM6650 USIM
- 55 -
C336 4.7u
12
R309 2.2K
1608
3.11.3 HKADC(House Keeping ADC)
- 57 -
3.11.4. Key Pad
PM_ON_SW_N
END
Figure 1.20 END Keypad Circuit
Table. Key Matrix Mapping Table
3.11.5 Camera Interface
MEGA CAMERA CONNECTOR
VT_CAMERA_CONNECTOR
Figure 1.21 Camera Socket Type Connector
- 58 -
Page
Page
- 61 -
3.11.6 Keypad Light
Figure 1.22 Schematic of KEY back light circuit (KEY side)
KEY_BACK_LIGHT LED(8EA)
- 62 -
3.11.7. LCD Module (NM176CN1 : Tovis)
Figure 1.23 Interface between LCD Module and MAIN PCB.
FL405
FL403
FL402
3.11.8.1. Audio Signal Processing & Interface
- 64 -
MSM6245 CODEC pins
AUDIO
Near to MSM
Figure 1.25 Audio part schematics
Figure 1.26 Audio part schematics
MIC
- 66 -
Audio part schematics
Audio AMP
NCP2890DMR2 U402
- 67 -
3.11.8.2. Audio Mode
There are three audio modes (Voice call, speaker phone, MIDI/MP3).
Audio & Sound Main Component There are 6 main components in U250/KU250.
Table. Audio Mode
Table. Audio main component list
3.12 Main Features
1. LG-U250/KU250 Main features
2. U250/KU250 Main Component
RF
SW100
Logic / Audio
Logic
Page
Page
- 75 -
4.2 SIGNAL PATH_UMTS RF
4.3 SIGNAL PATH_GSM RF
- 76 -
- 77 -
4.4 Checking VC-TCXO Block
Test Point of the VC-TCXO Block
TCXO
U104
X100
TP2 TP1
TP3
Page
- 79 -
4.5 Checking Front-End Module Block
Test Point of the Front-End Module Block
ANT_SEL0
ANT_SEL1
VREG_RF_SMPS
Page
- 81 -
4.6 Checking UMTS Block
For testing, Max power of UMT 2100 is needed.
PA_R0
U500
11
Page
Page
- 84 -
4.6.3 Checking RF Rx Level
PA_R0
L102
G2 RF
ANT G1
Page
Page
- 87 -
4.7.1 Checking RF Tx level
0
ANT_SEL1
GSM_PA_RAMP
U101
Page
- 89 -
4.7.4 Checking PAM Block
GSM_PA_EN
GSM_PA_BAND
SKY77318
FL1
4.7.5 Checking RF Rx Block
Schematic of GSM900/DCS/PCS Rx Block
- 90 -
TP1. DCS RX INPUT TP2. PCS RX INPUT TP3. GSM RX INPUT
ANT_SEL0
Page
4.8 Checking Bluetooth Block
Test Point of the Bluetooth Block
LBRQ-2B43A
ANT103
TP1
Page
4.9 Power ON Troubleshooting
Page
4.10 Charger Troubleshooting
CHARGER
- 97 -
[ Charger Troubleshooting Flow ]
Page
4. BB Trouble Shooting
4.11 USB Troubleshooting
- 100 -
4.12 SIM Detect Troubleshooting
- 101 -
1VREG_USIM_2.85V 2USIM_P_RST_N USIM_P_CLK
Figure. USIM part schematics
3 7USIM_P_DATA 1
USIM
4.13 Camera Troubleshooting
4.13.1 MEGA CAMERA
4.13.2 VGA CAMERA
- 104 -
C347
U303
C349
CAMERA LDO
- 105 -
4.14 Keypad Backlight Troubleshooting
+VPWR
Figure.Keypad backlight LED part
Key Pad Back Light is on as below : Key pressing KYBD_BACKLIGHT go to 0V MAIN Key Backlight LED On
KEY_BACK_LIGHT LED(8EA)
4.15 Main LCD Troubleshooting
Main LCD control signals are generated by MSM6245. The signal path is : MSM6245 CN400 LCD Module
- 107 -
4.16 Receiver Path
MSM6245 EAR1ON/EAR1OP R421,R422 Analog Switch(U401) Receiver
Page
- 109 -
4.17 Headset path
MSM6245 HPH_R, HPH_L C402/C401 R407/R406 CN401 (MMI Connector)
Page
- 111 -
4.18 Speaker phone path
Page
- 113 -
4.19 Main microphone
MIC400 MIC1P, MIC1N (MSM6245)
Page
- 115 -
4.20 Headset microphone
Headset C210/C211 MIC2P, MIC2N (MSM6245)
Page
4.21 Vibrator
Page
5. DOWNLOAD
5.1 U250/KU250 DOWNLOAD
5.1.1 Introduction
5.1.2 Downloading Procedure
5.1.2.1 Connecting to PC
1) 2)
3) 6) 4) 5) 7)
5.1.2.2 Choosing image files
Page
Page
5.1.2.3 Downloading
Page
Page
Page
5.1.3 Troubleshooting Download Errors
5.1.3.1 When the phone does not work
Page
Page
Page
5.1.4 Caution
D:\LGMDP\004400-01-429926\_COM14_
Page
Page
Page
Page
Page
6. BLOCK DIAGRAM
- 139 -
Main RF signal
Control signal
Page
Page
Page
- 143 -
DCS
ANT_SEL1
GSM_PA_EN
GSM_PA_BAND
- 144 -
ADC
USB_D-
VBATT
UART_TXD
- 145 -
LCD LDO
REV_1.0
MEMORY
3/4
- 146 -
VT_CAMERA_CONNECTOR
63
4/4
KEY / MMI
Page
Page
- 149 -
9. Calibration & RF Auto Test Program (Hot Kimchi)
9.1 Configuration of HOT KIMCHI
9.1.1 Configuration of directory
- 150 -
- 151 -
9.2 How to use HOT KIMCHI
Page
Page
10. Factory Test Mode
10.2. WCDMA Test Mode
10. Factory Test Mode
10.3. GSM Test Mode
- 157 -
11. EXPLODED VIEW & REPLACEMENT PART LIST
11.1 EXPLODED VIEW
Page
- 159 -
11.2 Replacement Parts <Mechanic component>
Note: This Chapter is used for reference, Part order
- 160 -
- 161 -
11.2 Replacement Parts <Main component>
Note: This Chapter is used for reference, Part order
- 162 -
- 163 -
- 164 -
- 165 -
- 166 -
- 167 -
- 168 -
- 169 -
- 170 -
- 171 -
- 172 -
Page
- 174 -
11.3 Accessory Note:This Chapter is used for reference, Part order