LG U250 Manuals

Manuals and User Guides for LG U250. We have 1 LG U250 manual available for free PDF download: Service Manual

LG U250 Service Manual

LG U250 Service Manual (175 pages)

LG Cell Phone User Manual

Brand: LG | Category: Cell Phone | Size: 5.73 MB

Table of Contents

Table of Contents
2
1 Introduction

4
- Purpose
  4
- Regulatory Information
  4
2 Performance

6
- System Overview
  6
- Usable Environment
  7
- Radio Performance
  7
- Current Consumption
  13
- Rssi Bar
  13
- Battery BAR
  14
- Sound Pressure Level
  15
- Charging
  15
3 Technical Brief

16
- General Description
  16
- GSM Mode
  18
- Gsm Transmitter
  21
- UMTS Mode
  22
- LO Generation and Distribution Circuits
  24
- Off-Chip RF Components
  24
- Digital Baseband(DBB/MSM6245)
  33
- Block Diagram(MSM6245)
  35
- Subsystem(Msm6245)
  36
- Vocoder Subsystem
  42
- Power Block
  44
- External Memory Interface
  49
- H/W Sub System
  51
  - Msm Sub System
    53
  - Key Pad
    56
  - Camera Interface
    57
  - Keypad Light
    60
- Main Features
  67
4 Trouble Shooting

72
- RF Component
  72
- Signal Path_Umts Rf
  74
- Signal Path_Gsm Rf
  75
- Checking VC-TCXO Block
  76
- Checking Front-End Module Block
  78
- Checking UMTS Block
  80
- Checking GSM Block
  85
  - Checking Rf Tx Level
    86
  - Checking Pam Block
    88
  - Checking Rf Rx Block
    89
- Checking Bluetooth Block
  91
- Power on Troubleshooting
  93
- Charger Troubleshooting
  95
- USB Troubleshooting
  98
- SIM Detect Troubleshooting
  99
- Camera Troubleshooting
  101
- Vga Camera
  102
- Keypad Backlight Troubleshooting
  104
- Main LCD Troubleshooting
  105
- Receiver Path
  106
- Headset Path
  108
- Speaker Phone Path
  110
- Main Microphone
  112
- Headset Microphone
  114
- Vibrator
  116
5 Download

118
- U250/Ku250 Download
  118
  - Introduction
    118
  - Downloading Procedure
    118
  - Connecting to Pc
    119
  - Troubleshooting Download Errors
    128
  - Caution
    132
6 Block Diagram

133
- GSM & UMTS RF Block
  133
- Interface Diagram
  135
7 Circuit Diagram

142
8 Pcb Layout

146
9 Calibration & RF Auto Test Program (Hot Kimchi)

148
- Configuration of HOT KIMCHI
  148
- How to Use HOT KIMCHI
  151
10 Factory Test Mode

153
- Test Program Setting
  153
- WCDMA Test Mode
  154
- GSM Test Mode
  155
11 Exploded View & Replacement Part List

156
- Exploded View
  156
- Replacement Parts
  158
- Mechanic Component
  158
- Main Component
  160
- Accessory
  173

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