LG LGP940 User manual

Internal Use Only
Service Manual
LG-P940
Date: December, 2011 / Issue 1.0

- 2 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. PERFORMANCE...................................................................... 7
2.1 Product Name............................................................................................7
2.2 Supporting Standard..............................................................................7
2.3 Main Parts : GSM Solution.....................................................................7
2.4 HW Features ...............................................................................................8
2.5 SW Features............................................................................................. 11
2.6 HW SPEC. ................................................................................................. 14
2.7 P940 Figures............................................................................................ 25
3. TECHNICAL BRIEF................................................................ 26
3.1 Radio Part General................................................................................ 27
3.2 Radio Part Rx Section........................................................................... 28
3.3 Radio Part Tx Section ........................................................................... 29
3.4 Radio Part Interfaces............................................................................ 30
3.5 Digital Baseband (OMAP4430) ........................................................ 31
3.6 Hardware Architecture........................................................................ 33
3.7 Subsystem (PMB9811_X-GOLDTM626) ....................................... 34
3.8 Power Block ............................................................................................. 47
3.9 External memory interface................................................................ 54
3.10 Audio and sound ................................................................................ 55
3.11 Main (8M pixels) & Sub (1.26M) Camera.................................... 60
3.12 Display..................................................................................................... 62
3.13 Vibrators.................................................................................................. 64
3.14 MHL(u-USB for HDMI)....................................................................... 65
3.15 Compass Sensor.................................................................................. 67
3.16 Motion Sensor...................................................................................... 68
3.17 Gyro Sensor........................................................................................... 69
3.18 Illumination & Proximity Sensor................................................... 70
3.19 Touch Module ...................................................................................... 71
3.20 Main Features....................................................................................... 72
4. TROUBLE SHOOTING .......................................................... 73
4.1 RF Component ....................................................................................... 73
4.2 SIGNAL PATH ........................................................................................... 74
4.3 Checking TCXO Block........................................................................... 77
4.4 Checking WCDMA Block .................................................................... 79
4.5 Checking WCDMA Block .................................................................... 86
4.6 GPS/WIFI/BT RF components........................................................... 93
4.7 GPS/WIFI/BT SIGNAL PATH ................................................................ 95
4.8 NFC.............................................................................................................. 97
4.9 Power ON Troubleshooting............................................................... 99
4.10 Charger Troubleshooting ..............................................................103
4.11 USB Trouble shooting .....................................................................105
4.12 Audio trouble.....................................................................................107
4.13 Camera trouble(8M/1.26M)..........................................................116
4.14 Main LCD trouble..............................................................................120
4.15 SIM detect Trouble shooting........................................................122
4.16 Vibrator Troubleshooting ..............................................................124
4.17 HDMI Troubleshooting...................................................................126
4.18 Motion Sensor on/off trouble......................................................127
4.19 Gyro/Compass sensor troubleshooting..................................130
4.20 Proximity Sensor on/off trouble .................................................133
4.21 Illumination Sensor on/off trouble............................................135
4.22 Touch trouble .....................................................................................137
5. DOWNLOAD.......................................................................140
6. BLOCK DIAGRAM...............................................................162
7. CIRCUIT DIAGRAM ............................................................168
8. BGA PIN MAP ....................................................................184
9. PCB LAYOUT.......................................................................193
10. CALIBRATION...................................................................201
10.1 Configuration of Tachyon..............................................................201
10.2 How to use Tachyon.........................................................................203
11. HIDDEN MENU.................................................................207
12. EXPLODED VIEW & REPLACEMENT PART LIST .............233
12.1 EXPLODED VIEW................................................................................233
12.2 Replacement Parts ...........................................................................241
12.3 Accessory .............................................................................................273

- 3 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
ʹΠΡΪΣΚΘΙΥι ͽ͸ͶΝΖΔΥΣΠΟΚΔΤͺΟΔͲΝΝΣΚΘΙΥΣΖΤΖΣΧΖΕ
΀ΟΝΪΗΠΣΥΣΒΚΟΚΟΘΒΟΕΤΖΣΧΚΔΖΡΦΣΡΠΤΖΤ
ͽ͸ͶͺΟΥΖΣΟΒΝΆΤΖ΀ΟΝΪ 4/140
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of this model.
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud associated
with your telecommunications system. System users are responsible for programming and configuring the
equipment to prevent unauthorized use. The manufacturer does not warrant that this product is immune
from the above case but will prevent unauthorized use of common-carrier telecommunication service of
facilities accessed through or connected to it.
The manufacturer will not be responsible for any charges that result from such unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone service
until repair can be done. A telephone company may temporarily disconnect service as long as repair is not
done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the this phone or compatibility with the
network, the telephone company is required to give advanced written notice to the user, allowing the user
to take appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its authorized
agent. The user may not make any changes and/or repairs expect as specifically noted in this manual.
Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and
may void any remaining warranty.
1. INTRODUCTION
1. INTRODUCTION
1. INTRODUCTION

- 4 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
ʹΠΡΪΣΚΘΙΥι ͽ͸ͶΝΖΔΥΣΠΟΚΔΤͺΟΔͲΝΝΣΚΘΙΥΣΖΤΖΣΧΖΕ
΀ΟΝΪΗΠΣΥΣΒΚΟΚΟΘΒΟΕΤΖΣΧΚΔΖΡΦΣΡΠΤΖΤ
ͽ͸ͶͺΟΥΖΣΟΒΝΆΤΖ΀ΟΝΪ 5/140
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information such
as the following to the end user.
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
G. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from
unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated
by the sign. Following information is ESD handling:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs are made to a system board, they should spread the floor with anti-static mat
which is also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective
package as described.
2. INTRODUCTION

- 5 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
ʹΠΡΪΣΚΘΙΥι ͽ͸ͶΝΖΔΥΣΠΟΚΔΤͺΟΔͲΝΝΣΚΘΙΥΣΖΤΖΣΧΖΕ
΀ΟΝΪΗΠΣΥΣΒΚΟΚΟΘΒΟΕΤΖΣΧΚΔΖΡΦΣΡΠΤΖΤ
ͽ͸ͶͺΟΥΖΣΟΒΝΆΤΖ΀ΟΝΪ 6/140
1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
Offset Phase Locked LoopOPLL
Light Emitting DiodeLED
Low Drop OutputLDO
Liquid Crystal DisplayLCD
Intermediate FrequencyIF
International Portable User IdentityIPUI
Global System for Mobile CommunicationsGSM
General Purpose Interface BusGPIB
Gaussian Minimum Shift KeyingGMSK
Flexible Printed Circuit BoardFPCB
Electrostatic DischargeESD
Electrical Erasable Programmable Read-Only MemoryEEPROM
Digital Signal ProcessingDSP
dB relative to 1 milli wattdBm
Digital Communication SystemDCS
Digital to Analog ConverterDAC
Constant Current – Constant VoltageCC-CV
Bit Error RatioBER
BasebandBB
Automatic Power ControlAPC
1. INTRODUCTION

- 6 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
ʹΠΡΪΣΚΘΙΥι ͽ͸ͶΝΖΔΥΣΠΟΚΔΤͺΟΔͲΝΝΣΚΘΙΥΣΖΤΖΣΧΖΕ
΀ΟΝΪΗΠΣΥΣΒΚΟΚΟΘΒΟΕΤΖΣΧΚΔΖΡΦΣΡΠΤΖΤ
ͽ͸ͶͺΟΥΖΣΟΒΝΆΤΖ΀ΟΝΪ 7/140
Wireless Application Protocol
WAP
Voltage Control Temperature Compensated Crystal OscillatorVCTCXO
Voltage Controlled OscillatorVCO
Universal Asynchronous Receiver/TransmitterUART
Time Division Multiple AccessTDMA
Time Division DuplexTDD
Travel AdapterTA
Side Tone Masking RatingSTMR
Pseudo SRAMPSRAM
Static Random Access MemorySRAM
Sending Loudness RatingSLR
Subscriber Identity ModuleSIM
Surface Acoustic WaveSAW
Real Time ClockRTC
Root Mean SquareRMS
Receiving Loudness RatingRLR
Radio FrequencyRF
Public Switched Telephone NetworkPSTN
Phase Locked LoopPLL
Programmable Gain AmplifierPGA
Printed Circuit BoardPCB
Power Amplifier ModulePAM
1. INTRODUCTION

2. PERFORMANCE
- 7 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2.1 Product Name
P940 : WCDMA900/1900/2100+EGSM/GSM850/DCS/PCS
(HSUPA 5.8Mbps(cat6)/HSDPA 14.4Mbps(cat10)/ HSPA+ 21/GPRS Class12/EDGE Class12)
2.2 Supporting Standard
Item Feature Comment
Supporting Standard WCDMA(FDD1,2,8)/EGSM/GSM850
/
DCS1800/PCS1900
with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C-E
Frequency Range WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD2) TX : 1850 – 1910 MHz
WCDMA(FDD2) RX : 1930 – 1990 MHz
WCDMA(FDD8) TX : 880 – 915 MHz
WCDMA(FDD8) RX : 925 – 960 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX: 824 – 849 MHz
GSM850 RX: 869 – 894 MHz
DCS1800 TX: 1710 – 1785 MHz
DCS1800 RX: 1805 – 1880 MHz
PCS1900 TX: 1850 – 1910 MHz
PCS1900 RX: 1930 – 1990 MHz
Application Standard
2. PERFORMANCE

2. PERFORMANCE
- 8 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2.3 Main Parts : GSM Solution
Item Part Name Comment
AP Chip OMAP 4430 : TI
CP Chip XMM6260 : Infineon
2.4 HW Features
Item Feature Comment
Form Factor DOP type
Battery 1) Capacity
Standard : Li-Ion Polymer, 1500mAh
2) Packing Type : Soft Pack
Size Standard : 127.5 x 69 x 8.85mm
Weight 138g With Battery
PCB L1B1 type, 10 Layers , 0.65t
Stand by time 2G Up to 500 hrs
3G Up to 500 hrs
@ Paging Period 9 (2G)
@ DRX 7 (3G)
Charging time 3 hrs @ Power Off / 1500mAh
T
alk time 2G Up to 250 mins
3G Up to 250 mins
@ Tx=Max(2G)
@ Tx = 12dBm (3G)
RX sensitivity WCDMA(FDD1) : -106.7 dBm
WCDMA(FDD2) : -106.7 dBm
WCDMA(FDD8) : -106.7 dBm
EGSM : -105 dBm
GSM850 : -105 dBm
DCS 1800 : -105 dBm
PCS 1900 : -105 dBm
T
X output power WCDMA/
GSM/
GPRS
WCDMA :
24dBm/3.84MHz,+1/-3dBm
EGSM : 33dBm
GSM850 : 33 dBm
DCS 1800 : 30 dBm
PCS 1900 : 30 dBm

2. PERFORMANCE
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Only for training and service purposes
LGE Internal Use Only
GPRS
compati
bility
EDGE GSM 900 : 27 dBm
DCS 1800 : 26 dBm
PCS 1900 : 26 dBm
Class3(WCDMA)
Class4 (EGSM)
Class4 (GSM850)
Class1 (PCS)
Class1 (DCS)
GPRS Class
12
E2 (GSM900)
E2 (PCS)
E2 (DCS)
EDGE compatibility EDGE Class 12
SIM card type Plug-In SIM
2.85V /1.8V
Display Main LCD (WVGA)
TFT Main LCD(4.3”, 480X800)
Built-in Camera 8M Camera, 1.26M secondary
Status Indicator No
Keypad Function Key : 4
Side Key : 4
Function Key:
Home,Back, menu,serach
Side Key :
Volume up,down, power key,
Camera key
AN
T
Main : LDS(Laser Direct Structure) type
Sub : DPA type(Directed Print Antenna)
System connector 5 Pin Micro USB 2.0 HS
Ear Phone Jack 3.5Phi, 4 Pole, Stereo
PC synchronization Yes
Memory(AP) eMMC : 8GB
LP-DDR2 : 1GB
Speech coding FR, EFR, HR, AMR, AMR-WB
Data & Fax Built in Data & Fax support
Vibrator Built in Vibrator
BlueTooth V3.0 HS
MIDI(for Buzzer
Function)
72 Poly, MP3 Ringtone

2. PERFORMANCE
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Only for training and service purposes
LGE Internal Use Only
Music Player MP3/ WMA/AAC/AAC+/WAV/AC3
Video Player MPEG4, H.263, H.264 @ Full HD 30fps/ Divx HD
Camcorder MPEG4, H.264, H.263 @ 3D : 720p 2D : 1080p
30pfs
Voice Recording Yes
Speaker Phone mode
Support
Yes
T
ravel Adapter Yes
CDROM No
Stereo Headset Yes
Data Cable Yes
T
-Flash
(External Memory)
Yes Upto 32GB