LG VX8350 User manual
Features of VX8350
Transmit Frequency (MHz) Receive Frequency (MHz)
CELLULAR PCS CELLULAR PCS GPS
824.82 ~ 848.19 1850~1910 869.82~893.19 1930~1990 1575.42
3. Rated Output Power : CELLULAR = 0.25W
PCS = 0.25W
4. Output Conversion Method : This is possible by correcting the key board channel.
5. Voltage and Current Value of Termination Part Amplifier (Catalogue included)
0.25W400mA4.2VAWT6308RPCS
0.25W400mA4.2VAWT6307RCELLULAR
PowerCurrentVoltagePart NameMODE
6. Functions of Major Semi-Conductors
Converts baseband signal to Tx RF signalRFT6150
Converts Rx RF signal to baseband signalRFR6500
Flash Memory (512Mbit) + SDRAM (512Mbit)
Storing of terminal operation program
Memory MCP
(HYG0SEG0AF1P-6S0E)
Terminal operation control and digital signal processingMSM6500
FunctionClassification
7. Frequency Stability
●CELLULAR : ±0.5PPM
●PCS : ±0.1PPM
1. Wave Type
●CELLULAR : G7W
●PCS: G7W
2. Frequency Scope
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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VX8350
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Table of Contents
General Introduction------------------------------------------------------------------------------------------3
CHAPTER 1. System Introduction-------------------------------------------------------4
1.1 CDMA Abstract--------------------------------------------------------------------------------------------4
1.2 Features and Advantages of CDMA Mobile Phone--------------------------------------------5
1.3 Structure and Functions of Dual-band CDMA Mobile Phone------------------------------8
1.4 Specification-----------------------------------------------------------------------------------------------9
1.5 Installation------------------------------------------------------------------------------------------------14
CHPATER 2. NAM Input Method--------------------------------------------------------16
2.1 NAM Program Method and Telephone Number Inputting Method---------------------16
CHAPTER 3. Circuit Description--------------------------------------------------------26
3.1 RF Transmit/Receive Part----------------------------------------------------------------------------26
3.2 Digital/Voice Processing Part-----------------------------------------------------------------------32
CHAPTER 4. Trouble Shooting---------------------------------------------------------36
4.1 Rx Part Trouble------------------------------------------------------------------------------------------36
4.1.1 DCN Rx--------------------------------------------------------------------------------------------------36
4.1.2 PCS Rx--------------------------------------------------------------------------------------------------48
4.2 Tx Part Trouble------------------------------------------------------------------------------------------60
4.2.1 DCN Tx--------------------------------------------------------------------------------------------------60
4.2.2 PCS Tx---------------------------------------------------------------------------------------------------74
4.3 Logic Part Trouble--------------------------------------------------------------------------------------88
4.3.1 Power----------------------------------------------------------------------------------------------------88
4.3.2 LCD-------------------------------------------------------------------------------------------------------92
4.3.3 Camera--------------------------------------------------------------------------------------------------94
4.3.4 Audio----------------------------------------------------------------------------------------------------97
4.3.5 Backlight----------------------------------------------------------------------------------------------109
4.3.6 Vibrator------------------------------------------------------------------------------------------------111
4.4 Bluetooth Part Trouble------------------------------------------------------------------------------113
CHAPTER 5. Safety------------------------------------------------------------------------115
CHAPTER 6. Glossary--------------------------------------------------------------------118
APPENDIX------------------------------------------------------------------------------------130
1.Assembly and Disassembly diagram-------------------------------------------------------------131
2.Block and Circuit diagram----------------------------------------------------------------------------134
3.Part List-----------------------------------------------------------------------------------------------------148
4.Component Layout--------------------------------------------------------------------------------------159
5.BGA Pin Map----------------------------------------------------------------------------------------------170
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VX8350
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
General Introduction
General Introduction
The VX8350 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 VX8350 support GPS Mode, we
usually call it tri-band phone. Also, VX8350 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/IS-95-A/B/C
ANSI J-STD-008 Protocol between MS and BTS for Cellular & AMPS
Protocol between MS and BTS for PCS
Network TIA/EIA/IS-634
TIA/EIA/IS/651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
MAS-BS
PCSC-RS
Intersystem operations
Nom-signaling data comm.
Service TIA/EIA/IS-96-B
TIA/EIA/IS-99
TIA/EIA/IS-637
TIA/EIA/IS-657
Speech CODEC
Assign data and fax
Short message service
Packet data
Performance TIA/EIA/IS-97
TIA/EIA/IS-98
ANSI J-STD-018
ANSI J-STD-019
TIA/EIA/IS-125
Cellular base station
Cellular mobile station
PCS personal station
PCS base station
Speech CODEC
* TSB –74: Protocol between an IS-95A system and ANSI J-STD-008
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VX8350
Copyright © 2007 LG Electronics. Inc. All right reserved.
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Chapter1. System Introduction
Chapter1. System Introduction
1.1 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 correlators 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.
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