LG KF755c Manuals

Manuals and User Guides for LG KF755c. We have 1 LG KF755c manual available for free PDF download: Service Manual

LG KF755c Service Manual

LG KF755c Service Manual (259 pages)

Brand: LG | Category: Cell Phone | Size: 17.07 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
  8
- Current Consumption
  17
- Rssi
  17
- Battery Bar
  17
- Sound Pressure Level
  18
- Charging
  19
3 Technical Brief

20
- Digital Baseband(DBB) & Multimedia Processor
  20
  - External Memory Interface
    23
  - Hardware Architecture
    24
  - Sim Interface
    29
  - Uart Interface
    29
  - Bluetooth Interface
    35
  - Microsd Interface Card
    39
  - Power on Sequence
    40
- GAM Hardware Subsystem
  44
  - Block Description
    45
  - Vga Camera
    47
  - Mega Camera
    47
  - Camera Regulator
    51
  - Main Lcd
    52
  - Lcd Backlight Illumination
    54
  - Keypad Illumination
    54
- Audio Part
  56
  - Audio Mode
    58
  - Voice Call
    59
  - Video Telephony
    63
  - Audio Main Component
    63
- Gpadc(General Purpose ADC) and AUTOADC2
  64
- Charger Control
  65
  - Fuel Gauge
    66
  - Battery Temperature Measurement
    67
  - Charging Part
    68
- Voltage Regulation
  71
- RF Technical Description
  72
- Wcdma Part
  73
4 Trouble Shooting

83
- Power on Trouble
  83
- USB Trouble
  84
- SIM Detect Trouble
  85
- Microsd Card Trouble
  86
- Keypad, Touch Button and Touch Screen Trouble
  87
- Multi el Lighting Trouble
  92
- Camera Trouble
  96
- Vga Camera
  99
- Main LCD Trouble
  102
- Keypad Backlight Trouble
  104
- Folder ON/OFF Trouble
  106
- Audio Trouble Shooting
  108
- Charger Trouble Shooting
  127
- Checking Bluetooth Block
  130
- RF Component
  137
- Procedure to Check
  138
- Checking Common Power Source Block
  139
- Checking VCXO Block
  144
- Checking Front End Module Block
  149
- Checking Front End Module Block Input Logic
  150
- Checking WCDMA Block
  153
  - Checking Control Signal
    154
  - Checking Rf Tx Level
    157
  - Checking Pam Block
    162
- Checking GSM Block
  168
  - Checking Regulator Circuit
    169
  - Checking Rf Tx Path
    172
  - Checking Rf Rx Path
    179
5 Download

183
- Lgdp2
  183
- Download
  185
6 Block Diagram

187
- Whole Block Diagram
  189
7 Circuit Diagram

190
8 BGM Pin Map

202
9 Pcb Layout

208
10 Calibration & RF Auto Test Program (Hot Kimchi)

218
- General Description
  218
- XCALMON Environment
  218
- Calibration Environment
  219
- Program Operation
  220
- Calibration Procedure
  224
11 Stand-Alone Test

225
- General Description
  225
- Program Operation
  226
- Stand-Alone Test
  229
12 Exploded View & Replacement Part List

232
- Exploded View
  232
- Replacement Parts
  234
- Main Component
  237
- Accessory
  257

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