LG lg-d821 User manual

Internal Use Only
Service Manual
LG-D821
Date: September, 2013 / Issue 0.9

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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
2. PERFORMANCE...................................................................... 5
2.1 Product Name............................................................................................5
2.2 Supporting Standard..............................................................................5
2.3 Main Parts & Solution .............................................................................6
2.4 HW Features ...............................................................................................6
2.5 SW Features ................................................................................................9
2.6 H/W SPEC.................................................................................................. 12
2.7 LG-D821 Figures..................................................................................... 29
3. TROUBLE SHOOTING .......................................................... 30
3.1 RF Component ....................................................................................... 30
3.2 SIGNAL PATH........................................................................................... 33
3.3 Checking XO Block................................................................................ 37
3.4 Checking RF Front-end Separator.................................................. 40
3.5 Checking RF Block................................................................................. 43
3.6 GPS Trouble shooting........................................................................122
3.7 WIFI/BT Trouble shooting.................................................................128
3.8 Audio troubleshooting .....................................................................133
3.9 Camera.....................................................................................................150
3.10 Main LCD trouble..............................................................................156
3.11 Touch Trouble Shooting.................................................................160
3.12 Vibrator Troubleshooting ..............................................................162
3.13 Gyro/Accel Sensor Troubleshooting.........................................165
3.14 Compass sensor troubleshooting..............................................167
3.15 Barometer sensor troubleshooting (Pressure Sensor )......169
3.16 Proximity Sensor on/o troubleshooting...............................171
3.17 Light Sensor on/o trouble..........................................................173
3.18 NFC .........................................................................................................175
3.19 Power ON Troubleshooting..........................................................178
3.20 Wireless Charging Troubleshooting..........................................182
3.21 USB Trouble shooting .....................................................................185
3.22 HDMI Troubleshooting...................................................................188
4. DOWNLOAD.......................................................................192
5. BLOCK DIAGRAM..............................................................209
6. CIRCUIT DIAGRAM ............................................................223
7. BGA PIN MAP.....................................................................238
8. PCB LAYOUT.......................................................................246
9. CALIBRATION.....................................................................252
10. DISASSEMBLE GUIDE......................................................271
11. EXPLODED VIEW & REPLACEMENT PART LIST .............281

- 3 - Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
1. Introduction
This manual provides the information necessary to repair, calibration, description and download the features
of this model.
1. 1 Purpose
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.
1. 2 Regulatory Information
A. Security
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 phones or compatibility with the net work,
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 Limitation
Maintenance limitations on the phones 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.

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Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. Introduction
3
E. Notice of Radiated Emission
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.
ATTENTION
H. Electrostatic Sensitive Devices
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the
sign. information is ESD handling: Following
• 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.
A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from
unsuppressed engines or electric motors may cause problems.
G. Interference and Attenuation
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.

2. PERFORMANCE
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LGE Internal Use Only
2. PERFORMANCE
2.1 Product Name
LG-D821 : WCDMA(B1,B2,B4,B5,B8)(HSPA+42Mbps(cat24)/ HSUPA 5.8Mbps(cat6) + GSM850/GSM900/DCS/PCS (GPRS Class10/EDGE
Class10)+ FDD LTE (B1, B3, B5, B7, B8, B20) (DL:102Mpbs, UL:51.0Mbps, Max DL MIMO layers = 2, Release8(Cat3))
2.2 Supporting Standard
LG-D821 Product SPEC
4
2.1 Product Name
LG-D821 :WCDMA(B1,B2,B4,B5,B8)(HSPA+42Mbps(cat24)/ HSUPA 5.8Mbps(cat6)
+ GSM850/GSM900/DCS/PCS (GPRS Class10/EDGE Class10)+ FDD LTE (B1, B3, B5, B7, B8, B20)
(DL:102Mpbs, UL:51.0Mbps, Max DL MIMO layers = 2, Release8(Cat3))
2.2 Supporting Standard
Item Feature Comment
Supporting Standard
WCDMA(FDD1,2,4,5,8)
/EGSM/GSM850/DCS1800/PCS1900 with seamless
handover
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(FDD4) TX : 1710 – 1755 MHz
WCDMA(FDD4) RX : 2110 – 2155 MHz
WCDMA(FDD5) TX : 824 – 849 MHz
WCDMA(FDD5) RX : 869 – 894 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
GSM900 TX : 880 – 915 MHz
GSM900 RX : 925 – 960 MHz
DCS1800 TX : 1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard WAP 2.0

2. PERFORMANCE
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LG-D821 Product SPEC
5
2.3 Main Parts & Solution
Item Part Name Comment
Digital Baseband AP Q8064 : Qualcomm
Analog Baseband MDM9215M : Qualcomm
RF Chip WTR1605L : Qualcomm
2.4 HW Features
Item Feature Comment
Form Factor DOP type
Battery
1) Capacity
Standard : Li-Ion Polymer, 2300mAh
2) Packing Type : Soft Pack Embeded
Size Standard :
133.9 x 68.7 x 9.1 (unit : mm)
Weight 139.5 g with Battery
PCB FR4, 10 Layers , 0.8t
Stand by time
CDMA Up to 350 hrs
GSM Up to 350 hrs
WCDMA Up to 350 hrs
LTE Up to 350 hrs
@ SCI2 (CDMA)
@ Paging Period 5 (GSM)
@ DRX 7 (WCDMA)
@ DRX7 (LTE)
Charging time 3 hrs 30min @ Power Off
Talk time
CDMA Up to 690 min
GSM Up to 405 min
WCDMA Up to 530min
LTE Up to 230 min
@ Tx= 10dBm (CDMA)
@ TX=LV5(EGSM)
@ Tx = 10dBm (WCDMA)
@ Tx = 10dBm (LTE )
RX sensitivity
WCDMA(FDD1) : -108 dBm
WCDMA(FDD2) : -108 dBm
WCDMA(FDD2) : -108 dBm
WCDMA(FDD5) : -108 dBm
WCDMA(FDD8) : -108 dBm
EGSM : -108 dBm
GSM850 : -108 dBm
DCS 1800 : -108 dBm
LG-D821 Product SPEC
5
2.3 Main Parts & Solution
Item Part Name Comment
Digital Baseband AP Q8064 : Qualcomm
Analog Baseband MDM9215M : Qualcomm
RF Chip WTR1605L : Qualcomm
2.4 HW Features
Item Feature Comment
Form Factor DOP type
Battery
1) Capacity
Standard : Li-Ion Polymer, 2300mAh
2) Packing Type : Soft Pack Embeded
Size Standard :
133.9 x 68.7 x 9.1 (unit : mm)
Weight 139.5 g with Battery
PCB FR4, 10 Layers , 0.8t
Stand by time
CDMA Up to 350 hrs
GSM Up to 350 hrs
WCDMA Up to 350 hrs
LTE Up to 350 hrs
@ SCI2 (CDMA)
@ Paging Period 5 (GSM)
@ DRX 7 (WCDMA)
@ DRX7 (LTE)
Charging time 3 hrs 30min @ Power Off
Talk time
CDMA Up to 690 min
GSM Up to 405 min
WCDMA Up to 530min
LTE Up to 230 min
@ Tx= 10dBm (CDMA)
@ TX=LV5(EGSM)
@ Tx = 10dBm (WCDMA)
@ Tx = 10dBm (LTE )
RX sensitivity
WCDMA(FDD1) : -108 dBm
WCDMA(FDD2) : -108 dBm
WCDMA(FDD2) : -108 dBm
WCDMA(FDD5) : -108 dBm
WCDMA(FDD8) : -108 dBm
EGSM : -108 dBm
GSM850 : -108 dBm
DCS 1800 : -108 dBm
2.4 HW Features
2.3 Main Parts & Solution

2. PERFORMANCE
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LG-D821 Product SPEC
6
PCS 1900 : -108 dBm
TX output power
WCDMA/
GSM/
GPRS
WCDMA B1,2, 4,8 :
24dBm/3.84MHz,+1/-
3dBm
WCDMA B5 :
23.5dBm/3.84MHz,+1/-
3dBm
EGSM : 32.5dBm
GSM850 : 32.5 dBm
DCS 1800 : 30 dBm
PCS 1900 : 30 dBm
GPRS
compatibilit
y
EDGE
EGSM : 26 dBm
GSM850 :26 dBm
DCS 1800 : 25 dBm
PCS 1900 : 25 dBm
Class3(WCDMA)
Class4 (EGSM)
Class4 (GSM850)
Class1 (PCS)
Class1 (DCS)
GPRS Class
12
E2 (GSM900)
E2 (PCS)
E2 (DCS)
EDGE compatibility GPRS Class 12
SIM card type Plug-In SIM
3V /1.8V
Display
Main LCD
IPS TFT Main LCD
(5.0”, 1920 X 1080 Pixels)
Built-in Camera 8M AF + 1.3M VT
Status Indicator Yes
Keypad Full Touch Screen
Side Key : 3
Side Key : Power On
Volume up/down
ANT Main : Internal Fixed Type
System connector 5 Pin u-USB
Ear Phone Jack 3.5Phi,
PC synchronization Yes
Memory(AP) 16Gb(SDRAM DDR2)

2. PERFORMANCE
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LG-D821 Product SPEC
7
+ 16GB eMMC
Speech coding FR, EFR, HR,AMR
Vibrator Built in Vibrator
BlueTooth Bluetooth 3.0
MIDI(for Buzzer
Function) SW Decoded 72Poly
Music Player MP3/WMA/AAC/MIDI/EAAC+/HE
AAC/OGG
Video Player MPEG4, H.264
Camcorder MPEG4 or H.263
Voice Recording Yes
Speaker Phone mode
Support Yes
Travel Adapter Yes
CDROM No
Stereo Headset Yes
Data Cable Yes
T-Flash
(External Memory) No

2. PERFORMANCE
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LG-D821 Product SPEC
8
2.5 SW Features
Item Feature Comment
RSSI 0 ~4 Levels
Battery Charging 0 ~ 7 Levels
Key Volume 0 ~ 7 Level
Audio Volume 0 ~ 15 Level
Time / Date Display Yes
Multi-Language Yes English, Espanol, Franch,
Korea, Chinese, etc
Quick Access Mode Camera/Chrome/App/Message/Phone
PC Sync No
Speed Dial Yes Voice mail center -> 1 key
Profile Yes not same with feature phone
setting
CLIP / CLIR Yes
Phone Book
Name / Number / Email /Organization/
Website / Postal addresses /Events/
Note / IM / Nickname / Internet call/
Group
Last Received
Number Yes
There is no limitation on the
number of items.
It depends on available
memory amount.
Last Missed Number Yes
There is no limitation on the
number of items.
It depends on available
memory amount.
Search by Number
/ Name Name / Number
Group Yes
There is no limitation on the
number of items.
It depends on available
memory amount.
2.5 SW Features

2. PERFORMANCE
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LG-D821 Product SPEC
9
Fixed Dial Number Yes
Service Dial Number No
Own Number Yes Read / Write
Voice Memo No
Call Reminder No
Network Selection Automatic
Mute Yes
Call Divert Yes
Call Barring No
Call Charge (AoC) No
Call Duration No
SMS (EMS)
There is no limitation on the number of
items.
It depends on available memory
amount.
EMS does not support.
SMS Over GPRS Yes
EMS Melody / Picture
Send / Receive / Save
No
No
MMS MPEG4
Send / Receive / Save TBD
Long Message Yes
Cell Broadcast Yes
Download Yes
Game Yes
Calendar Yes
Memo No
World Clock No
Unit Convert Yes
Stop Watch Yes
Wall Paper No
WAP Browser Yes WAP stack and wml are not
supported.
Download Melody /
Wallpaper Over web browser