Table Of Contents - LG KM555 Service Manual
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Also See for KM555:
- Technical specifications (1 page) ,
- User manual (146 pages) ,
- User manual (162 pages)
Table of Contents
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1. Introduction ................................................... 5
1.1 Purpose ......................................................................5
1.2 Regulatory Information .................................................5
1. Abbreviation ................................................................7
2. performance ................................................... 9
2.1 Supporting Standard ....................................................9
2.2. Main Parts .................................................................9
2. H/W features .............................................................10
2.4 HW Spec. .................................................................12
3. BB Circuit Technical brief ............................ 18
.1 Functional Block Diagram ..........................................18
.2 Baseband Processor Introduction ...............................19
. Power management IC...............................................
.4. Power ON/OFF .........................................................40
.5 SIM Interface .............................................................41
.6 T - Flash connector ....................................................42
.7 Memory ....................................................................4
.8 LCD Display ..............................................................44
.9 keypad back-light illumination ....................................45
.10 LCD back-light illumination ......................................46
.11 Battery voltage monitor ............................................48
.12 Audio ......................................................................49
.1 WLAN/Bluetooth/FM (RWFS-B971A) .........................52
.14 5PIN Interface connector ..........................................55
4. RF Circuit Technical Brief ............................ 56
4.1 General Description ...................................................56
4.2 GSM Part ..................................................................59
4. WCDMA Part .............................................................6
4.4 GSM Power Amplifier Module .....................................66
4.5 WCDMA Band1/8 Power Amplifier Module ..................67
4.6 WCDMA Band1/8 Low Noise Amplifier ........................68
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Table Of Contents
4.7 WCDMA Band1 Duplexer ...........................................69
4.8 WCDMA Band8 Duplexer ...........................................70
5. Trouble shooting .......................................... 71
5.1. Trouble shooting test setup ........................................71
5.2. Power on trouble ......................................................72
5. Charging Trouble .......................................................75
5.4 SIM Detect Trouble ....................................................77
5.5 Three-KEY backlight Trouble .......................................80
5.6 Micro SD Trouble .......................................................81
5.7 Audio Trouble ............................................................8
5.8 Microphone Trouble ...................................................89
5.9 M Camera Trouble ...................................................9
5.10 Main LCD Trouble ....................................................95
5.11 Touch Sensor ..........................................................97
5.12 WiFi /Bluetooth Trouble ............................................99
6. Download & S/W upgrade ......................... 104
7. Block diagram ............................................ 115
8. Circuit Diagram .......................................... 117
9. BGA Pin Map .............................................. 123
10. PCB Layout ............................................... 127
11. RF Calibration .......................................... 129
11.1 Test Equipment Setup ............................................129
11.2 Calibration Step .....................................................129
12.1 Exploded view .......................................................15
12.2 Replacement Parts ................................................17
12. Accessory .............................................................159
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LGE Internal Use Only
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