LG U8550 Manuals

Manuals and User Guides for LG U8550. We have 3 LG U8550 manuals available for free PDF download: Service Manual, Brochure

LG U8550 Service Manual (281 pages)

Brand: LG | Category: Cell Phone | Size: 6.95 MB

Table of Contents
2
1 Introduction

5
- Purpose
  5
- Regulatory Information
  5
- Abbreviations
  7
2 Performance

9
- System Overview
  9
- Usable Environment
  10
- Radio Performance
  10
- Current Consumption
  18
- Rssi
  18
- Battery Bar
  18
- Sound Pressure Level
  19
- Charging
  20
3 Technical Brief

21
- Digital Baseband(DBB) & Multimedia Processor
  21
  - General Description
    21
  - Hardware Architecture
    22
  - External Memory Interface
    26
  - RF Interface
    27
  - SIM Interface
    29
  - UART Interface
    30
  - GPIO (General Purpose Input/Output) Map
    31
  - Usb
    32
  - Folder ON/OFF Detection
    34
  - Bluetooth Interface
    35
  - Transflash Interface
    38
  - Power on Sequence
    39
  - Keypad
    40
- GAM Hardware Subsystem
  42
  - General Description
    42
- Block Description
  43
- Camera & Camera FPC Interface
  45
- Camera Regulator
  48
- Display & LCD FPC Interface
  49
- Main&Sub LCD Backlight Illumination
  51
- Camera Flash LED Illumination
  51
- Keypad Illumination
  52
- LCD Module
  53
- Analog Baseband (ABB) Processor
  54
  - Overview of Audio Path
    54
  - Audio Signal Processing & Interface
    55
  - Audio Mode
    57
  - Voice Call
    58
  - MIDI (Ring Tone Play)
    61
  - MP3 (Audio Player)
    62
  - Video Telephony
    63
  - Audio Part Main Components
    64
  - Gpadc(General Purpose ADC) and AUTOADC2
    66
  - Charger Control
    67
  - Fuel Gauge
    68
  - Battery Temperature Measurement
    69
  - Charging Part
    70
- Voltage Regulation
  73
  - Internal Regulation
    73
  - External Regulation
    73
- General Description of RF Part
  75
- GSM Mode
  77
  - Receiver
    77
  - Transmitter
    82
- WCDMA Mode
  84
  - Receiver
    84
  - Transmitter
    87
  - Frequency Generation
    91
4 Trouble Shooting

93
- Power on Trouble
  93
- USB Trouble
  95
- SIM Detect Trouble
  96
- Transflash Trouble
  97
- Keypad Trouble
  98
- M Camera Trouble
  100
- VGA Camera Trouble
  102
- Main LCD Trouble
  104
- Sub LCD Trouble
  106
- Keypad Backlight Trouble
  108
- Camera Flash Trouble
  110
- Audio Trouble
  112
  - Receiver
    112
  - Speaker
    116
  - Microphone
    120
  - Headset - Receiver
    124
  - Headset - MIC
    125
  - Headset
    126
- Charger Trouble
  127
- RF Component
  129
- Procedure to Check
  131
- Checking Common Power Source Block
  132
- Checking VCXO Block
  139
- Checking Ant. SW Module Block
  144
- Checking Antenna Switch Block Input Logic
  145
  - Mode Logic by TP Command
    145
  - Checking Switch Block Power Source
    147
- Checking WCDMA Block
  152
  - Checking VCXO Block
    153
  - Checking Ant. SW Module
    153
  - Checking Control Signal
    153
  - Checking RF TX Level
    155
  - Checking PAM Block
    158
  - Checking RX I,Q
    161
  - Checking GSM Block
    163
    
    Checking Regulator Circuit
    164
    
    Checking VCXO Block
    164
    
    Checking Ant. SW Module
    164
    
    Checking Control Signal
    165
    
    Checking RF Tx Path
    167
  - Checking Bluetooth Block
    180
  - Bottom View
    181
5 Block Diagram

184
- GSM & WCDMA RF Block
  184
6 Download

186
- The Purpose of Downloading Software
  186
- Download Environment Setup
  186
- U8XXX Download
  187
7 Calibration

199
- General Description
  199
- XCALMON Environment
  199
  - H/W Environment
    199
  - S/W Environment
    199
  - Configuration Diagram of Calibration Environment
    199
- Calibration Explanation
  200
  - Overview
    200
  - Calibration Items
    200
  - EGSM 900 Calibration Items
    201
  - DCS 1800 Calibration Items
    206
  - WCDMA Calibration Items
    209
  - Baseband Calibration Item
    217
- Program Operation
  218
  - XCALMON Program Overview
    218
  - XCALMON Icon Description
    219
  - Calibration Procedure
    222
  - Calibration Result Message
    224
8 Circuit Diagram

228
9 Pcb Layout

238
10 Exploded View & Replacement Part List

247
- Exploded View
  247
- Replacement Parts
  250
  - Mechanic Component
    250
  - Main Component
    254
- Accessory
  281

LG U8550 Brochure (10 pages)

LG Reveal: Product Brochure

Brand: LG | Category: Cell Phone | Size: 2.66 MB

LG U8550 Brochure (8 pages)

Multimedia 5M Phone

Brand: LG | Category: Cell Phone | Size: 1.9 MB

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LG U8550 Manuals

LG U8550 Service Manual (281 pages)

Table of Contents

1 Introduction

2 Performance

3 Technical Brief

4 Trouble Shooting

5 Block Diagram

6 Download

7 Calibration

8 Circuit Diagram

9 Pcb Layout

10 Exploded View & Replacement Part List

LG U8550 Brochure (10 pages)

LG U8550 Brochure (8 pages)

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