Table Of Contents - LG G5300 Service Manual

1. INTRODUCTION
1.1 Purpose ................................................. 3
1.2 Regulatory Information .......................... 3
A. Security ............................................. 3
B. Incidence of Harm ............................. 3
C. Changes in Service ........................... 3
D. Maintenance Limitations ................... 3
E. Notice of Radiated Emissions ............ 4
F. Pictures ............................................. 4
G. Interference and Attenuation ............ 4
H. Electrostatic Sensitive Devices ......... 4
1.3 Abbreviations ......................................... 5
2. PERFORMANCE
2.1 H/W Feature .......................................... 6
2.2 Technical Specification .......................... 7
3. TECHNICAL BRIEF
3.1 General Description ............................. 11
3.2 Receiver ............................................... 11
A. RF front end .................................... 12
B. Demodulator and baseband
processing ....................................... 12
C. DC Offset Compensation ................ 12
3.3 Transmitter Part ................................... 13
A. IF Modulator .................................... 13
B. OPLL ............................................... 14
C. Synthesizer ..................................... 14
D. Power Amplifier ............................... 15
3.4 13 MHz Clock ...................................... 16
3.5 Power Supplies and Control Signals ... 16
3.6 Testing Set-up and Checking Signals .. 17
A. Received RF Level and Checks ...... 17
B. Transmitted RF Level and Checks .. 17
3.7 Digital Main Processor ......................... 30
3.8 Analog Main Processor ........................ 35
3.9 Power management ............................. 40
3.10 Memories ........................................... 42

Table Of Contents

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............................ 11
3.11 Display and Interface ......................... 42
3
3.12 Keypad Switches and Scanning ........ 43
3.13 Microphone ........................................ 44
3.14 Earpiece ............................................. 45
3.15 Hands-free Interface .......................... 45
3.16 Headset Jack Interface ...................... 45
3.17 Key Back-light Illumination ................. 46
3.18 LCD Back-light Illumination ................ 47
3.19 Speaker & MIDI IC ............................. 48
4. TROUBLE SHOOTING
4.1 RF Components ................................. 50
4.2 Rx Trouble .......................................... 51
4.3 Tx Trouble .......................................... 59
6
4.4 Power On Trouble .............................. 72
4.5 Charging Trouble ............................... 74
4.6 LCD Trouble . ...................................... 76
4.7 Receiver Trouble . ............................... 78
4.8 Speaker Trouble ................................. 80
4.9 Mic. Trouble ........................................ 83
4.10 Vibrator Trouble ............................... 86
4.11 Backlight LED Trouble ..................... 88
4.12 SIM Detect Trouble .......................... 90
4.13 Earphone Trouble ............................ 92
4.14 HFK Trouble ..................................... 97
5. DISASSEMBLY
INSTRUCTION
5.1 Disassembly ..................................... 100
6. DOWNLOAD AND
CALIBRATION
6.1 Download ......................................... 103
6.2 Calibration ........................................ 109
A. Equipment List .............................. 109
B. Equipment Setup ........................... 109
C. Test Jig Operation ......................... 110
D. Procedure ..................................... 111
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................................... 100
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