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LG GX500 Service Manual
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Copyright © 2010 L
G Electronics. Inc. All right reserved.
Only for training and service purposes
L
GE Internal Use Only
4.
TROUBLE SHOO
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LGE
Propert
y
Figure
4-25. MMC_DETECT SIGNAL
Checking Flo
w
Card insert
Card Deject
ST
AR
T
T
F socket pins
are
well
soldered
Check proper
uSD?
Assemble
Resolder
it
(check data line
TP 1 is 2.9V Sig
nal)
Replace Main Board
Y
es
Y
es
No
Check Micro SD car
d voltage
(2V9_VMME)
89
91
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
4
Purpose
4
Regulatory Information
4
Abbreviations
6
2 Performance
8
H/W Features
8
Technical Specification
9
3 Technical Brief
16
GX500 Functional Block Diagram
16
Dual Baseband Processor (BBP) Introduction
17
Power Management IC
37
Power ON/OFF
45
Dual SIM & U-SD Interface
47
Memory
49
LCD Display
52
Keypad Switching & Scanning
53
LCD Back-Light Illumination
54
JTAG & ETM Interface Connector
55
Audio
56
Charging Circuit
58
WI-FI & BLUETOOTH & Fmradio
59
5Pin Micro USB Interface Connector
62
Triaxial, Digital Acceleration Sensor
63
Rf Block Diagram
64
General Description
65
Receiver Part
67
Transmitter Part
68
RF Synthesizer
69
Dcxo
69
Front End Module Control
70
Power Amplifier Module
71
PAM Schematic
72
4 Trouble Shooting
73
Trouble Shooting Test Setup
73
Power on Trouble
74
Charging Trouble
77
LCD Display Trouble
79
Camera Trouble
81
Receiver & Speaker Trouble
83
Microphone Trouble
85
Vibrator Trouble
86
SIM & Usd Trouble
88
Touch Trouble
91
LCD LED Trouble
92
Trouble Shooting of Receiver Part
93
Trouble Shooting of Transmitter Part
99
Trouble Shooting of WI-FI/BT/FM Part
108
5 Download & S/W Upgrade
111
6 Block Diagram
119
7 Circuit Diagram
120
8 BGA Pin Map
128
9 Pcb Layout
138
10 Rf Calibration
146
Test Equipment Setup
146
Calibration Step
146
11 Stand Alone Test
151
Sim1 Test
151
Sim2 Test
158
12 Engineering Mode
160
13 Exploded View & Replacement
162
Part List
162
1.2 Replacement Parts
164
Main Component
167
Accessory
188
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LG GX500 Specifications
General
Brand
LG
Model
GX500
Category
Cell Phone
Language
English
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