LG B2050 Service Manual - Page 2

Table Of Contents - accessories

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Table Of Contents 1. INTRODUCTION 2 1.1 Purpose 2 1.2 Regulatory Information 2 1.3 Abbreviations 4 5. DOWNLOAD AND CALIBRATION 88 5.1 Download 88 5.2 Calibration 93 2. PERFORMANCE 6 2.1 H/W Feature 6 2.2 Technical Specification 8 6. BLOCK DIAGRAM 94 7. CIRCUIT DIAGRAM 97 3. TECHNICAL BRIEF 13 3.1 Transceiver 13 3.2 Power Amplifier Module 19 3.3 13 MHz Clock 20 3.4 Power Supplies of RF circuits ........20 Digital Main Processor 22 3.6 Analog Main & Power Management Processor 28 3.7 Display Interface 38 3.8 Keypad Switches and Scanning .... 41 3.9 Microphone 42 3.10 Main Speaker 42 3.11 Headset interface 43 3.12 Key Back-light Illumination .......... 44 3.13 Vibrator 45 8. PCB LAYOUT 102 9. ENGINEERING MODE 105 9.1 BB Test [MENU 1 106 9.2 RF Test [MENU 2 107 9.3 MF mode [MENU 3 108 9.4 Trace option [MENU 4 109 9.5 Call timer [MENU 5 109 9.6 Fact. Reset [MENU 6 109 9.7 S/W version [MENU 7 109 10. STAND ALONE TEST 110 10.1 Introduction 110 10.2 Setting Method 110 10.3 Means of Test 111 4. TROUBLE SHOOTING 46 4.1 RX Trouble 46 4.2 TX Trouble 53 4.3 Power On Trouble 61 4.4 Charging Trouble 63 4.5 Vibrator Trouble 65 4.6 LCD Trouble 67 4.7 Speaker Trouble 71 4.8 SIM card interface trouble 74 4.9 Earphone Trouble 76 4.10 Key Backlight Trouble 78 4.11 Receiver Trouble 80 4.12 Microphone Trouble 82 4.13 RTC Trouble 84 4.14 Indication LED Trouble 86 12. AUTO CALIBRATION ...........113 11.1 Overview 113 11.2 Requirements 113 11.3 Menu and Settings 113 11.4 AGC 115 11.5 APC 115 11.6 ADC 115 11.7 Setting 115 11.8 How to do calibration 115 12. EXPLODED VIEW & REPLACEMENT PART LIST ...117 12.1 Exploded View 117 12.2 Replacement Parts

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Table Of Contents
1. INTRODUCTION
..........................
2
1.1 Purpose
...........................................
2
1.2 Regulatory Information
....................
2
1.3 Abbreviations
..................................
4
2. PERFORMANCE
........................
6
2.1 H/W Feature
...................................
6
2.2 Technical Specification
..................
8
3. TECHNICAL BRIEF
..................
13
3.1 Transceiver
...................................
13
3.2 Power Amplifier Module
..................
19
3.3 13 MHz Clock
...............................
20
3.4 Power Supplies of RF circuits
........
20
Digital Main Processor
..................
22
3.6 Analog Main & Power
Management Processor
................
28
3.7 Display Interface
.............................
38
3.8 Keypad Switches and Scanning
....
41
3.9 Microphone
....................................
42
3.10 Main Speaker
.............................
42
3.11 Headset interface
........................
43
3.12 Key Back-light Illumination
..........
44
3.13 Vibrator
........................................
45
4. TROUBLE SHOOTING
.............
46
4.1 RX Trouble
...................................
46
4.2 TX Trouble
...................................
53
4.3 Power On Trouble
.........................
61
4.4 Charging Trouble
...........................
63
4.5 Vibrator Trouble
..............................
65
4.6 LCD Trouble
..................................
67
4.7 Speaker Trouble
.............................
71
4.8 SIM card interface trouble
............
74
4.9 Earphone Trouble
...........................
76
4.10 Key Backlight Trouble
..................
78
4.11 Receiver Trouble
...........................
80
4.12 Microphone Trouble
....................
82
4.13 RTC Trouble
.................................
84
4.14 Indication LED Trouble
..................
86
5. DOWNLOAD AND
CALIBRATION
.......................
88
5.1 Download
.......................................
88
5.2 Calibration
.......................................
93
6. BLOCK DIAGRAM
.....................
94
7. CIRCUIT DIAGRAM
...................
97
8. PCB LAYOUT
.........................
102
9. ENGINEERING MODE
.............
105
9.1 BB Test [MENU 1]
.........................
106
9.2 RF Test [MENU 2]
.........................
107
9.3 MF mode [MENU 3]
......................
108
9.4 Trace option [MENU 4]
..................
109
9.5 Call timer [MENU 5]
......................
109
9.6 Fact. Reset [MENU 6]
...................
109
9.7 S/W version [MENU 7]
..................
109
10. STAND ALONE TEST
.............
110
10.1 Introduction
...............................
110
10.2 Setting Method
............................
110
10.3 Means of Test
............................
111
12. AUTO CALIBRATION
...........
113
11.1 Overview
.....................................
113
11.2 Requirements
..............................
113
11.3 Menu and Settings
......................
113
11.4 AGC
............................................
115
11.5 APC
............................................
115
11.6 ADC
............................................
115
11.7 Setting
........................................
115
11.8 How to do calibration
...................
115
12. EXPLODED VIEW &
REPLACEMENT PART LIST...117
12.1 Exploded View
............................
117
12.2 Replacement Parts
<Mechanic component>
...............
119
<Main component>
......................
120
12.3 Accessory
....................................
130