LG VX9100 Maroon User manual

Features of VX9100
Transmit Frequency (MHz) Receive Frequency (MHz)
CELLULAR PCS CELLULAR PCS GPS
824.04 ~ 848.97 1850~1909.95 869.04~893.97 1930~1989.95 1575.42
3. Rated Output Power : CELLULAR = 0.26W
PCS = 0.24W
4. Output Conversion Method : This is possible by correcting the key board channel.
5. Voltage and Current Value of Termination Part Amplifier (Catalogue included)
0.24W500mA4.2VAWT6321RPCS
0.26W500mA4.2VAWT6321RCELLULAR
PowerCurrentVoltagePart NameMODE
6. Functions of Major Semi-Conductors
Converts baseband signal to Tx RF signalRFT6150
Converts Rx RF signal to baseband signalRFR6500
Flash Memory (1Gbit) + SDRAM (512Mbit)
Storing of terminal operation program
Memory MCP
(HYC0SGH0MF3P)
Terminal operation control and digital signal processingMSM6550A
FunctionClassification
7. Frequency Stability
●CELLULAR : ±0.5PPM
●PCS : ±0.1PPM
1. Wave Type
●CELLULAR : G7W
●PCS: G7W
2. Frequency Scope

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VX9100
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved
Only for training and service purposes
CDMA Mobile Subscriber Unit
VX9100
SERVICE MANUAL
SERVICE MANUAL
DUAL BAND CDMA
[PCS/Cellular/GPS]
CDMA MOBILE PHONE

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VX9100
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved
Only for training and service purposes
Table of Contents
General Introduction……………………………………………………………….……………...3
CHAPTER 1. System Introduction……………..………………………………………...4
1. CDMA Abstract…….……………………………………………………………….….…….…..4
2. Features and Advantages of CDMA Mobile Phone………….........................................5
3. Structure and Functions of Dual-band CDMA Mobile Phone……………….……….….8
4. Specification……………………………………………………………………………………..9
5. Installation………………………………………………………………………………………14
CHPATER 2. NAM Input Method………………………………………..……………….16
1. NAM Program Method and Telephone Number Inputting Method……………………16
CHAPTER 3. Circuit Description………………………………..……………………….26
1. RF Transmit/Receive Part……………………………………………………………….……26
2. Digital/Voice Processing Part……………………………………………………………….32
CHAPTER 4. Trouble Shooting………………………………………...………………...36
1. RX Part Trouble Shooting………………………………………………………..................36
1.1 DCN RX………………………………………………………………………………………36
1.2 PCS RX……………………………………………………………………………….………48
2. TX Part Trouble Shooting…………………………………………………………….………60
2.1 DCN TX…………………………………………………………………………….…………60
2.2 PCS TX…………………………………………………………………………….…………74
3. Logic Part Trouble Shooting………………………………………………………….……..88
3.1 Power………………………………………………………………………………………...88
3.2 LCD…………………………………………………………………………………….……..92
3.3 Camera……………………………………………………………………………….………94
3.4 Audio………………………………………………………………………………….……...98
3.5 Backlight…………………………………………………………………………………...110
3.6 Vibrator……………………………………………………………………………………..114
4. Bluetooth Part Trouble Shooting………………………………………………………….116
CHAPTER 5. Safety………………………………………..………………………..………118
CHAPTER 6. Glossary……………………………………….………………………….…121
APPENDIX………………………………………………………………………………...……133

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VX9100
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved
Only for training and service purposes
General Introduction
General Introduction
The VX9100 phone has been designed to operate on the latest digital mobile communication technology, Code
Division Multiple Access (CDMA). This CDMA digital technology has greatly enhanced voice clarity and can
provide a variety of advanced features. Currently, CDMA mobile communication technology has been
commercially used in Cellular and Personal Communication Service (PCS). The difference between them is the
operating frequency spectrum. Cellular uses 800MHz and PCS uses 1.9GHz. The VX9100 support GPS Mode, we
usually call it tri-band phone. Also, VX9100 works on Advanced Mobile Phone Service (S-GPS). We call it dual-
mode phone. If one of the Cellular, PCS base stations is located nearby, Call fail rate of triple-mode phone is less
than dual-mode phone or single-mode phone.
The CDMA technology adopts DSSS (Direct Sequence Spread Spectrum). This feature of DSSS enables the phone
to keep communication from being crossed and to use one frequency channel by multiple users in the same specific
area, resulting that it increases the capacity 10 times more compared with that in the analog mode currently used.
Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined into this phone to
reduce the call being interrupted in a middle of talking over the phone.
Cellular and PCS CDMA network consists of MSO (Mobile Switching Office), BSC (Base Station Controller), BTS
(Base station Transmission System), and MS (Mobile Station). The following table lists some major CDMA
Standards.
CDMA Standard Designator Description
Basic air interface
TIA/EIA-95A
TSB-74
ANSI J-STD-008
TIA/EIA-IS2000
CDMA Dual-Mode Air Interface
14.4kbps radio link protocol and inter-band operation
IS-95 adapted for PCS frequency band CDMA2000
1xRTT Air Interface
Network
TIA/EIA/IS-634
TIA/EIA/IS-651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
MAS-BS
PCSC-RS
Intersystem operations
Non-signaling data comm.
Service
TIA/EIA/IS-96-B
TIA/EIA/IS-637
TIA/EIA/IS-657
IS-801
TIA/EIA/IS-707-A
Speech CODEC
Short Message Service
Packet Data
Position Determination Service (gpsOne)
High Speed Packet Data
1x EV-DO related
interface
TIA/EIA/IS-856
TIA/EIA/IS-878
TIA/EIA/IS-866
TIA/EIA/IS-890
CDMA2000 High Rate Packet Data Air Interface
1x EV-DO Inter-Operability Specification for HRPD
Access Network Interface
Recommended Minimum Performance Standards for
High Rate Packet Data Access Terminal
Test Application Specification (TAS) for High Rate
Packet Data Air Interface

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VX9100
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved
Only for training and service purposes
Chapter1. System Introduction
Chapter1. System Introduction
1. CDMA Abstract
The CDMA mobile communication system has a channel hand-off function that is used for collecting the information
on the locations and movements of mobile telephones from the cell site by automatically controlling several cell site
through the setup of data transmission routes, and then enabling one switching system to carry out the automatic
remote adjustment. This is to maintain continuously the call state through the automatic location confirmation and
automatic radio channel conversion when the busy subscriber moves from the service area of one cell site to that of
another by using automatic location confirmation and automatic radio channel conversion functions. The call state
can be maintained continuously by the information exchange between switching systems when the busy subscriber
moves from one Cellular system area to the other Cellular system area.
In the Cellular system, the cell site is a small-sized low output type and utilizes a frequency allocation system that
considers mutual interference, in an effort to enable the re-use of corresponding frequency from a cell site separated
more than a certain distance.
Unlike the time division multiple access (TDMA) or frequency division multiple access (FDMA) used in the band
limited environment, the Code Division Multiple Access (CDMA) system which is one of digital Cellular systems is
a multi-access technology under the interference limited environment. It can process more number of subscribers
compared to other systems (TDMA system has the processing capacity three times greater than the existing FDMA
system whereas CDMA system, about 12~15 times of that of the existing system).
CDMA system can be explained as follows; TDMA or CDMA can be used to enable each person to talk alternately
or provide a separate room for each person when two persons desire to talk with each other at the same time, whereas
FDMA can be used to enable one person to talk in soprano, whereas the other in bass (one of the two talkers can
carry out synchronization for hearing in case there is a bandpass filter function in the area of the hearer). Another
available method is to make two persons to sing in different languages at the same time, space, and frequency when
wishing to let the audience hear the singing without being confused. This is the characteristic of CDMA.
On the other hand, when employing the CDMA technology, each signal has a different pseudo-random binary
sequence used to spread the spectrum of carrier. A great number of CDMA signals share the same frequency
spectrum. In the perspective of frequency area or time area, several CDMA signals are overlapped. Among these
types of signals, only desired signal energy is selected and received through the use of pre-determined binary
sequence; desired signals can be separated, and then received with the correlator used for recovering the spectrum
into its original state. At this time, the spectrums of other signals that have different codes are not recovered into its
original state, and appears as the self-interference of the system.