User Manuals: LG KG115 Battery Replacement

Manuals and User Guides for LG KG115 Battery Replacement. We have 1 LG KG115 Battery Replacement manual available for free PDF download: Service Manual

LG KG115 Service Manual

LG KG115 Service Manual (88 pages)

Brand: LG | Category: Cell Phone | Size: 4.11 MB

Table of Contents

Table of Contents
2
Introduction

4
- Purpose
  4
- Regulatory Information
  4
System Specification

7
Technical Brief

8
- KG110 Block Diagram
  8
- RF Part Introduction
  9
  - Receiver Part
    9
  - A.low Noise Amplifiers
    10
  - B.down-Converting Mixers
    10
  - C.baseband Amplifiers / Low Pass Filters
    10
  - D.baseband Output D.C. Offset Correction
    11
  - E.receiver Local Oscillator (LO) Generator
    11
  - Transmitter Part
    11
  - Power Amplifier Module
    12
  - B.quadrature Modulator
    12
  - C.phase Frequency Detector (PFD)
    13
  - D.loop Filter
    13
  - E.tx Vco
    13
  - F.feedback Down-Converting Mixer
    13
  - G.transmit Frequency Plan
    13
  - H.main Frequency Synthesizer
    13
  - I.fractional N Dividers
    13
  - J.phase Frequency Detector/Charge Pump
    14
  - K.synthesizer Loop Filter
    14
  - L.voltage Controlled Oscillator
    14
  - The Crystal Reference System
    14
  - Power Management
    15
  - A.LDO Usage
    15
- Baseband Introduction
  16
  - Baseband Processor (AD6720 , U101)
    16
  - Interconnection with External Devices
    17
  - RTC Block Interface
    17
  - LCD Module Interface
    17
  - RF Interface
    17
  - SIM Interface
    18
  - LDO Block
    19
  - Battery Charging Block
    19
  - Display and Interface
    21
  - Keypad Switches and Scanning
    22
  - Microphone
    23
  - Soft-MIDI and Main Speaker
    24
  - Headset Interface
    25
  - Key Back-Light Illumination
    26
  - LCD Back-Light Illumination
    27
  - Vibrator
    27
Trouble Shooting

29
- RF Components
  29
- RX Trouble
  30
  - Check Crystal Circuit
    31
  - Check Control Signal
    32
  - Check Mobile SW & ANT SW
    33
  - Check SAW Filter
    35
  - Check I/Q Signal
    36
- TX Trouble
  37
  - Check Crystal Circuit
    38
  - Check Control Signal
    39
  - Check TX I/Q Signal
    40
  - Check PAM Control Signal
    41
  - Check Mobile SW & ANT SW
    42
- Power on Trouble
  44
- Charging Trouble
  46
- Download
  48
- Calibration
  50
  - Equipment Setup
    50
  - Setup
    50
- LCD Trouble
  57
  - LCD Blue Screen or Abnormal Display
    57
  - LCD Black Screen
    58
- Receiver Trouble
  59
- Speaker Trouble
  62
- MIC Trouble
  64
- Earphone Trouble
  66
- KEYPAD Backlight LEDS Trouble
  69
- SIM Trouble
  70
Appendix

72
- Bom
  72
- Mechanic Component
  80
- Exploded View
  81
- Circuit Diagram
  83
- Pcb Layout
  87

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