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LG lg-d821 User Manual
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3.
TROUBLE
SHO
O
TING
- 37 -
Copy
right ©
2013 L
G Electro
nics.
Inc. A
ll righ
t rese
rved.
Only f
or tr
aining
and service
purposes
L
GE Int
ernal U
se Only
3.3
Che
cking
X
O B
lock
The
output
fre
quency (19
.2MHz) o
f X
O (X6000) is
used
as the
ref
erence
one of
W
TR1605L
(U2004
) and
PM8
941(U6
002)
ntern
al
VCO
.
X6000
TP1
U2004
TP2
BO
T
T
OP
36
38
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
3
Purpose
3
Regulatory Information
3
2 Performance
5
Product Name
5
Supporting Standard
5
Main Parts & Solution
6
HW Features
6
SW Features
9
Hw Spec
12
LG-D821 Figures
29
3 Trouble Shooting
30
RF Component
30
Signal Path
33
Checking XO Block
37
Checking RF Front-End Separator
40
Checking RF Block
43
Checking Rf Tx Level
44
GPS Trouble Shooting
122
WIFI/BT Trouble Shooting
128
Audio Troubleshooting
133
Speaker Module
134
Receiver Troubleshooting
136
Camera
150
Main LCD Trouble
156
Touch Trouble Shooting
160
Vibrator Troubleshooting
162
Gyro/Accel Sensor Troubleshooting
165
Compass Sensor Troubleshooting
167
Barometer Sensor Troubleshooting (Pressure Sensor )
169
Proximity Sensor On/Off Troubleshooting
171
Light Sensor On/Off Trouble
173
Nfc
175
Power on Troubleshooting
178
Wireless Charging Troubleshooting
182
USB Trouble Shooting
185
HDMI Troubleshooting
188
4 Download
192
5 Block Diagram
209
6 Circuit Diagram
223
Fuel Gauge
230
Volume Key
233
Power Key
233
Wireless Charging
237
7 Bga Pin Map
238
8 Pcb Layout
246
9 Calibration
252
10 Disassemble Guide
271
11 Exploded View & Replacement Part List
281
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LG lg-d821 Specifications
General
Brand
LG
Model
lg-d821
Category
Cell Phone
Language
English
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