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LG HB620 Service Manual
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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright ©
2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
STAR
T
Check
TP
1
If
G
SM o
v
e
r
31
dB
m?
If
D
C
S
/
P
C
S ov
er
28dB
m
?
Check T
P
2,
T
P
3
If
TP
2
o
v
e
r
2
9
dBm?
If
TP
3
o
v
er
2
5
dB
m
?
Check PAM
Bl
oc
k
OK
?
Refer
to
ch
a
p
ter
3.
6.
3
Check
So
lder
ing o
f
P
AM
(U
1
01
)
If
pr
obl
e
m
st
il
l
e
xist
,
repla
ce
t
he P
A
M
Cha
n
ge
t
h
e
Bo
a
r
d
Pro
bl
em
r
e
so
l
ved
?
Yes
Yes
Ye
s
Yes
No
No
No
N
o
GS
M
/
D
C
S
/
P
C
S
T
x i
s
OK
Check o
t
he
r
pa
r
t
Check Fro
nt
-
En
d
Modu
l
e
Refer
to
ch
a
p
ter
3.
4
Check
t
he RT
R
627
5
GS
M
/
D
C
S
/
P
C
S
T
x i
s
OK
Z3X-BOX.COM
120
122
Table of Contents
Table of Contents
2
1 Introduction
4
Purpose
4
Regulatory Information
4
2 Performance
6
System Overview
6
Usable Environment
7
Radio Performance
8
Current Consumption
15
Rssi Bar
15
Battery BAR
15
Sound Pressure Level
16
Charging
17
3 Technical Brief
18
General Description
18
GSM Mode
20
UMTS Mode
23
LO Generation and Distribution Circuits
25
Off-Chip RF Components
26
Digital Baseband (DBB/MSM6280)
42
Subsystem(Msm6280)
44
Power Block
53
External Memory Interface
58
H/W Sub System
60
Feature List
71
4 Trouble Shooting
74
Power on Trouble
74
USB Trouble
76
SIM Detect Trouble
77
Key Sense Trouble (KEYPAD)
78
Keypad Backlight Trouble
80
Micro SD Trouble
82
Audio Trouble
83
Camera Trouble
94
Main LCD Trouble
98
Bluetooth Trouble
101
RF Component
103
Signal Path
104
Checking VCTCXO Block
106
Trouble Shooting 4.14 Checking Front-End Module Block
108
Default Chapter
108
Checking Front-End Module Block
108
Ant_Sel0
109
Ant_Sel1
109
Ant_Sel2
109
Umts_Tx_Rx
109
Dcs_Pcs_Tx
109
Egsm_Tx
109
Dcs_Rx2
109
Tp4 Vreg_Rf_Smps
110
Checking UMTS Block
111
Checking GSM Block
118
DVB-H/T Trouble
125
5 Download
128
Introduction
128
Downloading Procedure
128
Troubleshooting Download Errors
141
Caution
146
6 Block Diagram
147
GSM & UMTS RF Block
147
Interface Diagram
149
7 Circuit Diagram
152
8 BGM Pin Map
162
9 Pcb Layout
166
10 Calibration & Rf Auto Test (Hot Kimchi)
174
Usage of Hot-Kimchi
174
11 Exploded View & Replacement Part List
178
Exploded View
178
Replacement Parts
180
Mechanic Component
180
Main Component
183
Accessory
201
Other manuals for LG HB620
User Guide
346 pages
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LG HB620 Specifications
General
Brand
LG
Model
HB620
Category
Cell Phone
Language
English
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