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LG GX500 Service Manual
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- 92 -
L
GE Internal Use Only
Copyright © 2010 L
G Electronics. Inc. All right reserved.
Only for training and service purposes
4.
TROUBLE SHOO
TING
G
X
5
0
0
O
p
e
r
a
t
i
o
n
a
l
D
e
s
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r
i
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R
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9
2
/143
LGE
Propert
y
4.10
T
ouch trouble
Check P
oints
-
T
ouch driver IC soldering`
- FPCB_F
older Crack
Figure
4-26.
T
ouch driver IC Cir
cuit
Checking Flo
w
ST
AR
T
Pin6 of U
802 is
high?
FPCB_Key is
Crack?
Resolder U802
Check and Replace
Fpcb
_Key
Y
es
No
No
Pin1 of
T
o
uch driver IC(U80
2)
is hi
g
h
(
2.9v
)
?
Y
es
No
Check F
pcb_Key and
re
p
lace
Y
es
Replace FPCB_Folder and
Assemble
DNI
C821
DNI
C822
DNI
C823
DNI
C824
TP802
2V7_VTOUCH
I
N
D
8
1
8
R
0
9
1
8
R
I
N
D
5
1
8
R
10U
C819
0.1UF
C820
2V62_VIO
TSC2007IYZGR
U802
D3
B3
D2
B2
D1
B1
C3
A3
C2
A2
C1
A1
AUX
SDA
VDD_REF
A1
X+
X-
PENIRQ-
SCL
A0
GND
Y+
Y-
2V62_VIO
I
N
D
3
1
8
R
I2C2_SCL
I2C2_SD
A
TS_XP
TS_XM
TS_YP
TS_YM
TS_IRQ
TOUCH IC
90
92
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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