LG LG-E977 User manual

Internal Use Only
Service Manual
LG-E977
Date: March, 2013 / Issue 1.0

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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 : GSM Solution.....................................................................5
2.4 HW Features ...............................................................................................6
2.5 SW Features............................................................................................. 11
2.6 HW SPEC. ................................................................................................. 14
3. CIC_AND SERVICE CENTER................................................. 23
3.1 CIC FAQ...................................................................................................... 23
4. TROUBLE SHOOTING .......................................................... 41
4.1 RF Component ....................................................................................... 41
4.2 SIGNAL PATH........................................................................................... 44
4.3 Checking XO Block................................................................................ 47
4.4 Checking FEMiD (GSM, WCDMA B1/B2/B5) Block ................... 50
4.5 Checking WCDMA Block .................................................................... 52
4.6 Checking GSM Block............................................................................ 80
4.7 Checking LTE Block............................................................................... 90
4.8 GPS/WIFI/BT Module..........................................................................112
4.8 GPS/WIFI/BT SIGNAL PATH ..............................................................114
4.10 Checking GPS/WIFI/BT....................................................................115
4.11 Audio troubleshooting...................................................................121
4.12 13M AF Camera Trouble Shooting.............................................129
4.13 1.3M front Camera Trouble Shooting.......................................132
4.14 Camera Flash Trouble Shooting..................................................134
4.15 Main LCD trouble..............................................................................136
4.16 Touch trouble .....................................................................................139
4.17 Vibrator Troubleshooting ..............................................................141
4.18 Gyro Sensor troubleshooting......................................................144
4.19 Compass sensor troubleshooting..............................................146
4.20 Proximity Sensor on/o trouble.................................................149
4.21 Light Sensor on/o trouble..........................................................151
4.22 Pressure Sensor troubleshooting...............................................152
4.23 Power ON Troubleshooting..........................................................154
4.24 Charging Troubleshooting............................................................159
4.25.USB Trouble shooting .....................................................................160
4.26 HDMI Troubleshooting...................................................................164
5. DOWNLOAD.......................................................................165
6. BLOCK DIAGRAM...............................................................185
7. CIRCUIT DIAGRAM ............................................................197
8. BGA PIN MAP ....................................................................216
9. PCB LAYOUT.......................................................................227
10. CALIBRATION...................................................................237
11. HIDDEN MENU.................................................................257
12. Guide to............................................................................272
12.1 Guide to apply label,approval.....................................................272
12.2 Guide to read IMEI by IMEI reader..............................................273
12.3 Guide to disassemble......................................................................275
13. EXPLODED VIEW & REPLACEMENT PART LIST .............281
13.1 EXPLODED VIEW................................................................................281
13.2 Replacement Parts ...........................................................................282
13.3 Accessory .............................................................................................331

- 3 - Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
LGE Internal Use Only
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 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 Limitations
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.
1. INTRODUCTION

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Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
LGE Internal Use Only
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
A 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. PERFORMANCE
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Only for training and service purposes
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2.1 Product Name
LG-E977 : WCDMA 850/1900/2100+GSM850/EGSM/DCS/PCS, LTE B7, 17
(HSUPA 5.8Mbps(cat6)/HSPA+ 42Mbps(cat24)/GPRS Class12/EDGE Class12)
2.2 Supporting Standard
Item Feature Comment
Supporting Standard WCDMA(FDD1,2,5)/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(FDD5) TX : 824 – 849 MHz
WCDMA(FDD5) RX : 869 – 894 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
LTE Band7 TX : 2500 – 2570 MHz
LTE Band7 RX : 2620 – 2690 MHz
LTE Band17 TX : 704 – 716 MHz
LTE Band17 RX : 734 – 746 MHz
Application Standard
2.3 Main Parts : GSM Solution
Item Part Name Comment
AP Chip APQ8064 : Qualcomm
CP Chip MDM9215M : Qualcomm
RF Chip WTR1605L : Qualcomm
2. PERFORMANCE
2.1 Product Name
2.2 Supporting Standard
LG-E977 : WCDMA 850/1900/2100+GSM850/EGSM/DCS/PCS, LTE B7, 17
(HSUPA 5.8Mbps(cat6)/HSPA+ 42Mbps(cat24)/GPRS Class12/EDGE Class12)
2.3 Main Parts : GSM Solution

2. PERFORMANCE
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2.4 HW Features
Item Feature Comment
Form Factor DOP type
Battery
1) Capacity
Standard : Li-Ion Polymer, 2100mAh
2) Packing Type : Soft Pack
Size Standard :
131.9 x 68.9 x 8.45 mm
Weight 141 g (TBD) With Battery
PCB Full Layer type, 12 Layers , 0.65t
Stand by time
2G Up to 460 hrs
3G Up to 420 hrs
@ Paging Period 5 (2G)
@ DRX 7 (3G)
Charging time 3 hrs. 15mins @ Power Off /
2100mAh
Talk time 2G Up to 10 hrs. 45mins
3G Up to 12 hrs. 40mins
@ Tx=Max(2G)
@ Tx = 12dBm (3G)
RX sensitivity
WCDMA(FDD1) : -106.7 dBm
WCDMA(FDD2) : -106.7 dBm
WCDMA(FDD5) : -106.7 dBm
EGSM : -105 dBm
GSM850 : -105 dBm
DCS 1800 : -105 dBm
PCS 1900 : -105 dBm
LTE : - 97dBm
TX output power
WCDMA/
GSM/
LTE/
GPRS
WCDMA :
23dBm/3.84MHz,+1/-
3dBm
EGSM : 33dBm
GSM850 : 33 dBm
DCS1800 : 30dBm
PCS 1900: 29.5 dBm
LTE : 23dBm
2.4 HW Features

2. PERFORMANCE
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GPRS
compatibility
EDGE
EGSM : 27 dBm
GSM850 :27dBm
DCS 1800 : 26 dBm
PCS 1900 : 26 dBm
Class3(WCDMA)
Class4 (EGSM)
Class4 (GSM850)
Class1 (PCS)
Class1 (DCS)
GPRS
Class 12 E2 (GSM850/GSM900) E2 (DCS/PCS)
EDGE compatibility EDGE Class 12
SIM card type Plug-In SIM
3.0V /1.8V
Display Main LCD (HD)
TFT Main LCD(4.67”, 768X1280)
Built-in Camera 13M Camera, 1.3M secondary
Status Indicator YES
Keypad Side Key : 3
Side Key :
Volume up,down,
power key
ANT
Main : LDS(Laser Direct Structure) type
Sub : F-PCB Type
NFC : Attached Battery cover
System connector 5 Pin Micro USB 2.0 HS
Ear Phone Jack 3.5Phi, 4 Pole, Stereo
PC synchronization Yes
Memory(AP) eMMC : 32GB
LP-DDR2 : 16GB
Speech coding FR, HR, EFR HR/FR,AMR HR/ FR, SAIC
Data & Fax Built in Data & Fax support
Vibrator Built in Vibrator
BlueTooth V4.0 BLE (BT Low Energy)
MIDI(for Buzzer SW Decoded 72Poly

2. PERFORMANCE
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Cell power(dBm) GSM WCDMA LTE Comment
Bar 5->4 -80dBm ±3dBm -78dBm ±3dBm -84dBm ±3dBm
1. Cell Connecteted
& CPICH level
= 3.3
2. LTE l RSRP
Bar 4->3 -89dBm ±3dBm -87dBm ±3dBm -95dBm ±3dBm
Bar 3->2 -98dBm ±3dBm -97dBm ±3dBm -104dBm ±3dBm
Bar 2->1 -104dBm ±3dBm -103dBm ±3dBm -114dBm ±3dBm
Bar 1->No
service No service No service No service
1) RSSI Display
LGE Internal Use Only
Function)
Music Player MP3/WMA/AAC/MIDI/EAAC+/AAC+/3GPP/MIDI/
AMR/MMF/MP4/WAV
Video Player MPEG4, H.264, H.263 + AMR-NB, WMV7, WMV8,
WMV9, DIVX, WVC1
Camcorder MPEG4 or H.263, H.264
Voice Recording Yes
Speaker Phone mode
Support Yes
Travel Adapter Yes
CDROM No
Stereo Headset Yes
Data Cable Yes
T-Flash
(External Memory) NO
1) RSSI Display
Cell Power
[dBm]
GSM WCDMA LTE Comment
Bar 54 -80 ± 3dB -78 ± 3dB -84 ± 3dB
1. Call Connected
& CPIPH Level=-
3.3
2. LTE: RSRP
Bar 43 -89 ± 3dB -87 ± 3dB -95 ± 3dB
Bar 32 -98 ± 3dB -97 ± 3dB -104 ± 3dB
Bar 21 -104 ± 3dB -103 ± 3dB -114 ± 3dB
Bar 1
No Service No Service No Service No Service
Measure RSSI after 10 seconds if you change power.
Measure RSSI after 10 seconds if you change power.

2. PERFORMANCE
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2) Charging Time
210 minutes under
3) Travel Charger
Input : 100 ~ 240 V, 50/60 Hz
Output : 5.0V, 1200 mA
4) Battery Type
Li-ion Battery Pack, 2100 mAh
Standard Voltage : 3.8 V, Battery Full Charge Voltage : 4.35V
5) Current Consumption
ITEM
Specification
GSM WCDMA LTE
1. Sleep Mode Less than 6 mA 6mA or less 9mA less than
2. Sleep : Ear jack to
connect Less than 7.5 mA 7.5mA or less 10.5mA or less
3. Standby (Sleep & Idle
current average) 9mA Less than @ P.P 5 9mA less than @ DRX 7 11mA or less
4. BT Connected Standby
10.5mA quiescent
current compared to less
than (less than 1.5mA)
10.5mA quiescent
current compared to
less than (less than
1.5mA)
12.5mA quiescent
current compared to less
than (less than 1.5mA)
5. Talk Mode GSM LVL 5
400 mA or less @ Avg
- Max Pwr
600mA or less
@ Avg
- Tx 10dBm
400 mA or less @ Avg
450mA or less LTE Cat2 @
TX 10dBm
6. No SVC Mode 200 mA or less 200 mA or less
7. Power Off Mode 200uA or less 200uA or less 200uA or less
5) Current Consumption
2) Charging Time
210 minutes under
3) Travel Charger
Input : 100 ~ 240 V, 50/60 Hz
Output : 5.0V, 1200 mA
4) Battery Type
Li-ion Battery Pack, 2100 mAh
Standard Voltage : 3.8 V, Battery Full Charge Voltage : 4.35V

2. PERFORMANCE
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6) Battery Bar
Battery Bar Specification Battery Bar Specification
Bar 20(Full) 98% Bar 9 -> Bar 8 43% -> 42%
Bar 20 -> Bar 19 98% -> 97% Bar 8 -> Bar 7 38% -> 37%
Bar 19 -> Bar 18 93% -> 92% Bar 7 -> Bar 6 33% -> 32%
Bar 18 -> Bar 17 88% -> 87% Bar 6 -> Bar 5 28% -> 27%
Bar 17 -> Bar 16 83% -> 82% Bar 5 -> Bar 4 23% -> 22%
Bar 16 -> Bar 15 78% -> 77% Bar 4 -> Bar 3 18% -> 17%
Bar 15 -> Bar 14 73% -> 72% Bar 3 -> Bar 2 13% -> 12%
Bar 14 -> Bar 13 68% -> 67% Bar 2 -> Bar 1 8% -> 7%
Bar 13 -> Bar 12 63% -> 62% Bar 1 -> Bar 0 3% -> 2%
Bar 12 -> Bar 11 58% -> 57% Power off 1%이하
Bar 11 -> Bar 10 53% -> 52% Low battery pop-up 15% , 5%, 0%
Bar 10 -> Bar 9 48% -> 47%
6) Battery Bar