LG TU550 Flip Phone Manuals

LG TU550 Flip Phone Manuals

Manuals and User Guides for LG TU550 Flip Phone. We have 1 LG TU550 Flip Phone manual available for free PDF download: Service Manual

LG TU550 Service Manual

LG TU550 Service Manual (186 pages)

Brand: LG | Category: Cell Phone | Size: 5.03 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
  13
- Sound Pressure Level
  14
- Charging
  15
3 Technical Brief

16
- General Description
  16
- GSM Mode
  18
- UMTS Mode
  21
- LO Phase-Locked Loop
  25
- Off-Chip RF Components
  27
- Digital Baseband(DBB/MSM6275)
  34
- Hardware Architecture
  35
- Subsystem(Msm6275)
  37
- Power Block
  40
- External Memory Interface
  45
- H/W Sub System
  46
- Main Features
  63
4 Trouble Shooting

68
- RF Component
  68
- Signal Path_Umts Rf
  70
- Checking VCXO Block
  72
- Checking Ant. SW Module Block
  74
- Checking UMTS Block
  76
- Checking GSM Block
  83
- Power on Troubleshooting
  92
- Charger Troubleshooting
  94
- USB Troubleshooting
  97
- SIM Detect Troubleshooting
  99
- Camera Troubleshooting
  100
- Keypad Backlight Troubleshooting
  101
- Folder ON/OFF Troubleshooting
  102
- Main LCD Troubleshooting
  103
- Audio Receiver Path
  104
- Headset Path
  106
- Speaker Phone Path
  108
- Main Microphone
  110
- Headset Microphone
  112
5 Download

114
- Introduction
  114
- Downloading Procedure
  114
- Download Process
  122
- Troubleshooting Download Errors
  128
- Caution
  133
6 Block Diagram

134
- GSM & UMTS RF Block
  134
- Interface Diagram
  136
7 Circuit Diagram

136
- Top Side
  138
- Bottom Side
  139
8 Pcb Layout

147
9 Calibration

152
- Hot Kimchi
  152
- How to Use Hot Kimchi
  156
- HOT KIMCHI Example
  157
10 Exploded View & Replacement Part List

160
- Exploded View
  160
- Replacement Parts
  162
- Mechanic Component
  162
- Main Component
  165
- Accessory
  184

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