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LG GS290 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
3.
TECHNICAL BRIEF
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LGE
Propert
y
3.22. P
AM Schematic
Figure
28 P
AM schematic
22u
C500
C509
47p
1K
R505
SKY77344
U501
1
2
11
10
12
9
13
8
14
7
15
6
16
5
17
4
18
3
19
2
20
1
BS
MODE
ENABLE
VDET
VRAMP
VBATT2
DCS_PCS_IN
VBATT1
GSM_IN
GND9
GND1
DCS_PCS_OUT
GND2
GND8
GND3
GSM_OUT
GND4
GND7
GND5
GND6
D
N
G
P
1u
C530
VBAT
27p
C531
PA_LEVEL
PA_MODE
PA_BAND
TXON_PA
LBAND_PAM_I
N
HBAND_PAM_IN
SKY77344
59
61
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
GS290 Functional Block Diagram
16
Baseband Processor (BBP) Introduction
17
General Description
18
Block Description
18
Power Management IC
29
Power ON/OFF
34
SIM & Usd Interface
35
Memory
38
LCD Display
39
Keypad Switching & Scanning
40
Keypad Back-Light Illumination
41
LCD Back-Light Illumination
42
Audio
43
Charging Circuit
45
FM Radio & BLUETOOTH
46
Pin U-USB Interface Connector
50
General Description
53
Receiver Part
55
Transmitter Part
56
RF Synthesizer
57
Front End Module Control
58
Power Amplifier Module
59
PAM Schematic
60
4 Trouble Shooting
61
Trouble Shooting Test Setup
61
Power on Trouble
62
Charging Trouble
65
LCD Display Trouble
67
Camera Trouble
69
Receiver & Speaker Trouble
71
Microphone Trouble
74
Vibrator Trouble
76
Keypad Back Light Trouble
78
SIM & Usd Trouble
80
Touch Trouble
84
Trouble Shooting of Receiver Part
86
Trouble Shooting of Transmitter Part
92
5 Download & S/W Upgrade
100
6 Block Diagram
111
7 Circuit Diagram
112
8 BGA Pin Map
120
9 Pcb Layout
128
10 Engineering Mode
134
Test Equipment Setup
134
Calibration Step
134
11 Stand Alone Test
139
Test Program Setting
139
Tx Test
142
Rx Test
144
12 Exploded View & Replacement
146
Exploded View & Replacement Part List
146
Exploded View
146
Replacement Parts
148
Main Component
151
Other manuals for LG GS290
User Guide
74 pages
User Manual
2 pages
Quick Reference Guide
106 pages
4
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LG GS290 Specifications
General
Brand
LG
Model
GS290
Category
Cell Phone
Language
English
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