LG LG500 User manual

GSM Phone
SERVICE MANUAL
MODEL : LG-500
SERVICE MANUAL MODEL : LG-500

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1. Introduction ................................... 2
2. Specification & Feature .......... 2
2.1 Product Name .................................. 2
2.2 Supporting Standard ........................ 2
2.3 Main Parts ........................................ 2
2.4 Main Features .................................. 3
2.5 HW Features .................................... 4
2.6 SW Features .................................... 6
3. Keypad Arrangement &
Functions .......................................10
3.1 Front of the Phone ......................... 10
3.2 Keypad Description ........................ 11
4. Disassembly/Reassembly ... 12
4.1 Disassembly .................................. 12
4.1.1 Disassembly of Upper Case......12
4.1.2 Assembly/Disassembly of
Upper Case .............................. 14
4.1.3 Disassembly of Lower Case..... 16
4.1.4 Disassembly of Lower Case .... 17
4.1.5 Disassembling PCB ................. 18
4.2 ASSEMBLY ................................... 19
5. Data Kit & Test Method ......... 20
5.1 Data Kit .......................................... 20
5.1.1 Download Equipment ............... 20
5.1.2 Data Kit Download
Procedure ................................ 20
5.1.3 Test Equipment ........................ 24
5.1.4 Test Equipment Setup ............. 24
5.2 Test Method ................................... 25
5.2.1 Power-On Trouble ................... 25
5.2.2 MIC Trouble ............................. 26
5.2.3 RECEIVER Trouble ................. 27
5.2.4 Melody Trouble ........................ 28
5.2.5 LCD Trouble ............................ 29
5.2.6 Charge Trouble ........................ 30
5.2.7 Vibrator is not working ............. 31
5.2.8 Backlight is not Working .......... 32
5.2.9 TX POWER Trouble ................ 33
5.2.10 Rx Sensitivity
Trouble(E GSM) ..................... 34
5.2.11 Rx Sensitivity
Trouble(DCS) ......................... 35
6. PCB Diagram &
Testpoint Description ............ 36
7. Block Diagram ........................... 39
7.1 BB Block Diagram .......................... 39
7.2 RF Block Diagram .......................... 40
8. Schematic Diagram ................ 41
8.1 Baseband ....................................... 42
8.1.1 Baseband ................................. 43
8.1.2 Memory devices ....................... 44
8.1.3 Audio ........................................ 45
8.1.4 MMI .......................................... 46
8.2 RF top schematic ........................... 47
8.2.1 Baseband parts in RF .............. 47
8.2.2 Pascal RF ................................ 48
8.2.3 Hitachi PA ................................ 49
9. EXPLODED VIEW ..................... 51
10. Replacement Parts list ....... 52
Table Of Contents

1. Introduction
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1. Introduction
LG-500 is a mobile phone operated in the GSM Digital Cellular Mobile Radio System, which is the Pan-
European mobile cellular standard. LG-500 has the operation band of GSM 900 and DCS 1800. GSM
Phase II features are fully supported and part of the GSM Phase II+ features are also supported. About
the SIM Toolkit, LG-500 supports upto Class 3 including Class 1, 2. For speech communication, LG-
500 supports Full Rate(FR), Enhanced Full Rate(HFR) and Half Rate(HR).
For easy text is implemented and WAP protocol is adopted for internet connection.
2. Specification & Feature
2.1 Product Name
LG-500
2.2 Supporting Standard
2.3 Main Parts : GSM Solution
Item Feature
Supporting Standard GSM 900/DCS 1800 Dual Band
E-GSM
Phase 2 and Phase 2+
SIM Toolkit : Class 1,2,3
Frequency Range E-GSM TX : 880 - 915 MHz
E-GSM RX : 925 - 960 MHz
DCS 1800 TX : 1710 - 1785 MHz
DCS 1800 RX : 1805 - 1880 MHz
Application Standard WAP : Yes
Item LG-500 Chip-set
Digital Baseband Hercules ROM 20 @ 26MHz
Analog Baseband Nausica
RF Chip Pascal (single slot)

2. Specification & Feature
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2.4 Main Features
Category Feature Remark
Language English and other languages are
under this category.
SIM Toolkit Class 1,2,3
Pre-paid SIM Applied
Operation
Text Input(eZi Text) Language All available languages
2 languages per market
Predictive word input
Phone Book 1 Phone Numbers for 1 Name 500 Phone numbers
Voice Recording up to 90 seconds
Dialing up to 20 names
Schedule Manager Calendar, Day Scheduler, Calendar includes
Weekly Scheduler lunar(Chinese).
Game Applied Five games
Clock Current time
World time
Alarm
Calculator General calculator
WAP Version 1.1 AUR Browser

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2.5 HW Features
Category Feature Remark
Form Factor Flip(Active)
Battery 1. Capacity
Standard : Li-Ion, 600 mAh Bare Cell : 5.5 x 30 x 48 mm
16g
Extended : Li-Ion, 1050 mAh Packed Size: 6.7 x 35 x 50 mm
Bare Cell : 8.6 x 34 x 48 mm
30g
2. Packing Type
Standard : Soft Pack
Extended : Hard Pack
Size 109.5 x 46 x 19.8 (mm) Extended : 109.5 x 46 x 23.1 (mm)
Weight 93.6 gram (Standard)
PCB One PCB(8 Layers, 0.9t) 106 x 39.2 x 0.9 (mm)
Average Talk time current
240 (mA) Estimated
Standby current 4~5 (mA) Estimated
Talk time Up to 2.5 hours @ 600 mAh It may be different depending
Standby time Up to 150 hours @ 600 mAh on network service.
Charging time 2 hr
RX sensitivity GSM 900 : -108 dBm Conducted emission test
DCS 1800 : -108 dBm
TX output power GSM 900 : +33 dBm Class4 (GSM)
DCS 1800 : +30 dBm Class1 (DCS)
SIM card type Plug-In SIM 3V / 5V
Display Full Graphic type No Hard Icon
Pixels : 128 x 90 Line : 9lines - 8 X 8
Size(Active) : 29X 23 (mm) 5lines - 8 X 12
4lines - 8 X 16 (pixels)
Back light : Single LED X 4 Pure Green
Status Indicator Single LED Yellow
Keypad Alphanumeric Key : 12 Function Key:*
Flip Detection Key : 1 Navigation(4 Key),
Function Key* : 9 Ease Key(O.K),
Side Key : 3 Soft Key, Soft2 Key,
Total # of Keys : 25 SEND, END/PWR Key
ANT(Antenna) Fixed Type Snap In type
System connector 26 Pins It includes 2 DTC pins
Ear Phone Jack 4 Poles 6 Pins (ø 2.5mm) M±, R±
PC synchronization Applied

2. Specification & Feature
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Category Feature Remark
Memory Flash : 4Mbytes
SRAM : 512Kbytes
EEPROM : 256Kbits
Speech coding FR, EFR, HR
Data & Fax Built-in
Vibrator Built-in Type : Cylinder
Melody(for Buzzer Applied/Built-in Buzzer Function by Using
Function) Speaker Phone & Melody IC
C-Mike Built-in
Receiver Built-in
Speaker Phone Built-in
Travel Adapter Built-in
Accessories Belt Clip Some optional items may be
Cigarette Lighter Adapter basic items depending on
Data communication Kit circumstances.
Extended Battery(1,050mAh) Pack
DeskTop Charger
Handsfree Car Kit
Portable Handsfree (Ear-Phone)

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2.6 SW Features
Function Detail Item Specification
Display Screen Display LCD
Backlight LCD, Keypad
RSSI 5 Levels
Battery Charging 4 Levels
RTC Applied
Language Options English and other languages are under this
category.
Keypad Number of Keys 12 Numeric Keys
Send & End Key
4 Navigation Keys
1 Easy Key(O.K)
2 Soft Function Keys
1 Flip Detect Key
3 Side Keys
Key Locking Applied
Internatioal Access (+) Applied
Normal Features Dialled Number 10
Received Number 10
Missed Number 10
Scratch Pad Memory 1
Call Management Call Waiting
Call Hold
Call Swap
Call Retrieve
Voice Recording in call
Any Key Answer
Auto Answer
Speaker Phone
Closed User Group
Automatic Redial
Sending Number It depends on network and subscription.
Call divert
Speed Dialling
Last Number Redial
Multi-party Call
Conference Call
Voice Dialling Number of Voice Dial Max. 20 Phone numbers
Phone Book
Voice Tag Time 1.6 second
Network Automatic Network Selection
Manual Network Selection
Network Service Status

2. Specification & Feature
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Function Detail Item Specification
DTMF DTMF Signalling
DTMF Enable & Disable
Audio Key Tone Volume 5 Levels
Ring Tone Volume 5 Levels
Ring Tone Pattern 31 Ring tones
Ring Type 1)Ring
2)Vibrate
3)Vibrate & Ring
4)Silent
Earpiece Volume 5 Levels
Mute & Unmute
Cell Broadcast Read Cell Broadcast
Cell Broadcast Categories
Cell Broadcast Message
Language
Voice Recording Voice Recording Time Max. 3 Minutes
Phone Book Number Store and Recall In Numeric order
Alpha Store In Alphabetical order
Alpha Recall In Alphabetical order
Displayed in alpha. or number In Alpha./Numeric order
Copy & Move SIM to Phone
Phone to SIM
Fixed Dial Number
Barred Dial Number
Service Dial Number
Caller Group
E-mail Entry
Call Cost Last Call Timer
Last Call Charge Units
Total Call Timer
Total Charge Units
Visible or Audible Call for
Time/Cost Indication
Supplimentary Forwarding ‘All Incoming
Services Calls’
Forwarding ‘On Busy’
Forwarding ‘No Reply’
Forwarding ‘Not-reachable’
Barring ‘All Outgoing Calls’
Barring ‘All Outgoing
International Calls’
Barring ‘All Outgoing int.
Calls except to Home Country’

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Function Detail Item Specification
Barring ‘All incoming Calls’
Barring ‘All incoming Calls
when roaming’
SIM Plug-In Type
Service Provider Lock &
Network Lock
Auto Detection 3V & 5V Detection
SIM Toolkit Class 1, 2, 3
Prepaid SIM Operation
Short Message Read Message
Write and Edit Message
Send and Receive Message
Reply to Message
Forward Message
Extract Number from Message
Message Status
Message Unread Indicator
Settable Message Center Number
Reply Path
Validity
Alerting for received visible &
audible messages.
Voice Mail
Settable Voice Mail Center
Number
Message Protocol Normal
Fax
National Paging
E-mail
X400
ERMES
Voice
Multi-Band Supporting standard GSM 900
E-GSM
DCS1800
Miscelleous Development & Test Facility
Function Field Test Facility
Display Software Version
Display Serial Number
Text Input Language Available languages vary in each
country
Predictive word input eZi text
Scheduler

2. Specification & Feature
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Function Detail Item Specification
WAP Version 1.1 AUR Browser
World Time Setting Local Time
Number of Selectable Cities 24 Cities
Calculator Operator Addition
Substraction
Multiplication
Division
Unit Convert Length Conversion
Weight Conversion
Volume Conversion
Surface Conversion
PC Sync. Phone Book Sync.
Message Sync.
Scheduler Sync.
Game Corsair
Crazy Race
Diamond King
Stone Axe
Black Jack

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3. Keypad Arrangement & Functions
3.1 Keypad Arrangement
1 Call Indicator Light
2 Earpiece
3 Record Key
4 Display Screen
5 Up/Down Side Key
6 Soft Left Key
7 Easy Key
8 Send Key
9 Numeric Keys
10 Star Key
11 Active Flip
12 Antenna
13 Handsfree Connector
14 Soft Right Key
15 Navigation Keys
16 END/PWR Key
17 Hash Key
18 Microphone

3.2 Functions of Keys
3. Keypad Arrangement & Functions
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The following shows key components of the phone.
Key Description
Soft Left Key / Soft Right Key
Each of these keys performs the function indicated by
the text on the display immediately above it.
WAP Hotkey
You can directly connect to WAP by pressing this key.
Navigation Keys
You can use these keys to scroll through names, phone numbers, menus
or setting options. In a standby mode,
if you press up/down navigation keys, you can see the
"Dialed Number” “Received Number” and “Missed Number”.
Send Key
You can dial a phone number and answer a call.
If you press this key without entering a number, your phone shows the
most recently dialled number.
Numeric Keys
These keys are used mainly to dial in standby mode
and enter numbers or characters in editing mode.
When you press these keys for a long time.
• Use to call your voice mail box.
• Use to make international call.
• Use ~ for speed dials.
Star Key
Used to enter to vibration mode by pressing this key
for a long time.
Hash Key
Also used to key lock by pressing this key for a long time.
END/PWR Key
Used to end or reject a call. This key is also used as Power Key. You can
power on and off by pressing this
key for a long time.
Record Key
You can use voice memo by pressing this key for a long time.
Up/Down Side Key
You can control the volume of key tone in standby mode and also control
the volume during a call.

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4. Disassembly/Reassembly
4.1 Disassembly
4.1.1 Disassembly of Upper Case
1. Push the battery locker, and then remove the battery cover.
2. Pull the battery downward and lift it up.
3. Use your thumb to pull down the battery-locker hard.
Figure 4-1. Removing the Battery cover and the Battery
Upper Case
Lower Case
Battery Cover

4. Disassembly/Reassembly
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4. Loosen the 4 screws as shown below.
5. While the Lower case is detached from the Upper case, twist the Lower case to the right for
disassembling a hook. Then twist it again to the left for disassembling the other hook. Finally,
take out the Lower case from the Upper case.
Figure 4-2. Disassembling of Upper and Lower Case

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4.1.2 Disassembly of Upper-Case Components
1. Release the screws and lift up the speaker holder to remove the speaker.
2. Use a '-' type driver carefully to lift up the Lower case of the vibrator spindle.
Assembly:
- Make sure the terminal of Speaker is being attached towards the Antenna.
- When inserting the earphone cap, place its upper part into the hole first. And from the inside, use
a long nose to hold and pull it.
Figure 4-3. Removing the Speaker and Vibrator

4. Disassembly/Reassembly
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3. Use a small '-'type driver to insert into the direction and lift it up to remove the battery spring.
4. Also, for the SIM-card cover, use '-'type driver to remove it.
5. Release the Volume BTN by pushing it with opposite force onto each side. And for the Recording
BTN, just push one its side to release it.
Figure 4-4. Removing the Battery spring and Sim Card cover

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4.1.3 Disassembly of Lower Case
1. Use a '-' type driver to release from the hooks on Lower case.
Then, lift up the PCB for final disassembly.
2. Insert a small '-'type driver between the shield-can and cover, and lift up along the flat side of the
lower case.
Figure 4-5. Removing the PCB
3. Lift up the rubber part of multi-key, and then the Dial BTN will be disassembled from the Lower
Case.
4. While holding the Lower case with your left hand, use your right hand to twist the flip-cover to the
hinges.
Assembly : Leave the flip cover open and insert one side of the flip-cover into the hinge as
shown in fig.4-6. Then twist the flip-cover when inserting the other end. DO NOT use
too much force onto it. Make sure the flip is working properly, after the assembly.
Figure 4-6. Removing the Flip

4. Disassembly/Reassembly
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4.1.4 Disassembly of Lower-Case Components
1. Use a pin to lift up the microphone to the direction as shown in fig. 4-7.
2. Use a pin to release the Receiver.
Figure 4-7. Removing the Receiver
3. Insert a '-'type driver between the hinge and the Lower case, and lift it up to remove the hinge.
4. See the cover from the A-direction shown in fig. 4-8, and assemble a pink hinge on its left and a
green hinge on its right.
Figure 4-8. Removing the Hinge

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4.1.5 Disassembly of PCB
1. Lift up the side hooks as shown in fig.4-9. Then the main PCB and the LCD Module will be
disassembled.
Assembly:
- Insert guide-hooks of LCD Module into guide-holes of Main PCB and push it in until it clicks.
- When placing Backup-battery onto Battery-hold, make sure the battery poles are facing the right
direction.
Figure 4-9. Removing the LCD
2. Use a '-'type driver to push away the antenna hook, and then disassemble the Antenna.
Assembly: Push the Antenna into the hole until it clicks.
Figure 4-10. Removing the Antenna

4. Disassembly/Reassembly
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4.2 ASSEMBLY
- Reassembly of PCB
1. Hang the Main PCB onto the hook on Lower case and push it down.
2. Connect the lead wire of Speaker and Vibrator to the Main PCB. Make sure that the poles are
facing right directions.
3. As shown in fig. 4-11, insert Lower case to the hooks on the top of Upper case.
4. Finally, tighten the cases with 4 screws.
Figure 4-11. Reassembling Upper Case and Lower Case