LG GM730 User manual

Service Manual Model : GM730/GM735
Internal Use Only
Service Manual
GM730/GM735
Date: November, 2009 / Issue 1.0

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION...............................................5
1.1 Purpose......................................................................5
1.2 Regulatory Information.................................................5
2. PERFORMANCE............................................... 7
2.1 System Overview.........................................................7
2.2 Usable environment.....................................................8
2.3 Radio Performance......................................................9
2.4 Current Consumption ................................................13
2.5 RSSI BAR..................................................................14
2.6 Battery BAR ..............................................................14
3. TECHNICAL BRIEF......................................... 15
3.1 GENERAL DESCRIPTION.............................................15
3.2 GSM MODE...............................................................16
3.3 UMTS MODE.............................................................20
3.4 GPS MODE ...............................................................23
3.5 LO GENERATION and DISTRIBUTION CIRCUIT ..............23
3.6 OFF-CHIP RF COMPONENTS......................................24
3.7 Main Features...........................................................28
3.8 Digital Baseband(DBB/MSM7200A) ............................33
3.9 Hardware Architecture ...............................................34
3.10 Subsystem(MSM7200A) ..........................................36
3.11 Power Block............................................................39
3.12 External memory interface .......................................44
3.13 H/W Sub System .....................................................46
3.14 Audio and sound .....................................................55
3.15 Camera interface.....................................................62
3.16 Proximity Sensor .....................................................69
3.17 Luminance Sensor...................................................70
3.18 Motion Sensor.........................................................71
4. TROUBLE SHOOTING..................................... 72
4.1 RF Component ..........................................................72
4.2 SIGNAL PATH ............................................................74
4.3 Checking TCXO Block ................................................78
4.4 Checking Front End Module(FEM) Block......................80
4.5 Checking WCDMA Block ............................................83
4.6 Checking GSM Block .................................................95
4.7 Power ON Troubleshooting .......................................102
4.8 Charger Troubleshooting ..........................................104
4.9 USB trouble.............................................................107
4.10 Audio trouble.........................................................109
4. 11 5M Camera trouble...............................................119
4.12 VGA Camera trouble ..............................................122
4.13 Main LCD trouble ..................................................125
4.14 SIM Detect Troubleshooting....................................127
4.15 Keypad Backlight Troubleshooting...........................129
4.16 LINEAR MOTOR.....................................................130
4.17 Proximity Sensor on/off trouble...............................131
4.18 Luminance Sensor on/off trouble............................133
4.19 Motion Sensor on/off trouble ..................................135
5. Downloading .............................................. 137
5.1 Introduction.............................................................137
5.2 Downloading Procedure...........................................138
6. BLOCK DIAGRAM........................................ 147
7. CIRCUIT DIAGRAM...................................... 157
8. BGA Pin Map ..............................................165
9. PCB LAYOUT ...............................................173
10. Calibration & RF Auto Test Program
(Tachyon)..................................................177
10.1 Confi guration of Tachyon.......................................177
10.2 How to use Tachyon...............................................179
11. Test Mode................................................. 182
12. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................191
12.1 EXPLODED VIEW ...................................................191
12.2 Replacement Parts ................................................193
12.3 Accessory .............................................................219

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
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.

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. INTRODUCTION
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. Pi ct ur es
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.

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
2. PERFORMANCE
2.1 System Overview
400x240 / 176x144,
SXGA, VGA, QVGA, CIF, QCIFImage Sca
Video
ling Down
8. Main Camera
(3M)
30 fps at Preview modeFrame Rate
0.162mmPixel Pitch
400 x 240Dot
Progressive, <=X2
2592(H) X 1944(V) pixels. WQVGA
CMOS image sensor
Typ. 400:1
Min. 65%, Typ. 70%
a-Si TFT, Trans missive
262,000
3 inch
Type
Resolution
Digital Zoom
Size
7. LCD
Color
Display Type
NTSC
Contrast Ratio
MSM7200A, RTR6285, PM75405. MSM Chipset
4Gb(Flash) / 2Gb(SDRAM) /User Memory : 100 MB(TBD)6. Memory
1000mAh (Li-Ion)4. Power
106g3. Weight
109.8 x 56.5 x 11.9 (mm)2. Size
Bar Type1. Phone Type
Type / Spec.
4Mbps
Throughput
IEEE 802.11b/g
11. WLAN
1m
10. Bluetooth
50 ~ 200m
Speaker/Receiver3) Receiver
18x12 oval type speaker2) Mono
72poly, SW MIDI1) MIDI
9. Audio

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2.2 Usable environment
1) Environment
2) Environment (Accessory)
Item Specification
Voltage 3.7 (Typ), 4.2 (Max)V
Operation Temp -20 ~ +60°C
Storage Temp -30 ~ +85°C
Humidity 65 % (Max)
Reference Spec.
TA Power AC 110 ~ 240V, 60Hz

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
2.3 Radio Performance
1) Transmitter - GSM Mode
SpecificationItem
-98dBm/-96dBm (2.439%)
AM Suppression
-GSM : -31dBm - DCS : -29dBm
0.5TTiming Advance
800kHz, 1600kHz
: -98dBm/-96dBm (2.439%)
Intermodulation rejection – Speech
channels
400kHz : -19dBm/-22dBm(5/0), -23dBm
600kHz : -21dBm/-24dBm(5/0), -26dBm
Spectrum due to switching transient
Class II(RBER) : -105dBm(2.439%)Reference Sensitivity – TCH/FS
0.012(-15 - -40dBm)Usable receiver input level range
GSM :
1800-3000kHz :< -63dBc(-46dBm)
3000kHz-6000kHz : <-65dBc(-46dBm)
6000kHz < : < -71dBc(-46dBm)
DCS :
1800-3000kHz :< -65dBc(-51dBm)
6000kHz < : < -73dBc(-51dBm)
Spectrum due to modulation out to larger
than 1800kHz offset to the edge of the
transmit band
200kHz : -36dBm
600kHz : -51dBm/-56dBm
Spectrum due to modulation out to less
than 1800kHz offset
<3.69usBurst Timing
GSM : 5dBm – 33dBm 3dB
DCS/PCS : 0dBm – 30dBm 3dB
Transmitter Output power and Burst
Timing
GSM/DCS : < -28dBm
EMC(Radiated Spurious Emission
Disturbance)
GSM : 0.1 ppm
DCS/PCS : 0.1 ppm
Frequency Error
RMS : 5
Peak : 20 
Phase Error

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
2) Transmitter - WCDMA Mode
+24 dBm / 3.84 MHz, +1 / -3 dB
Maximum Output
Power
< -15 dB at Pout t-20 dBm
Peak Code Domain
Error
< 17.5 %, when Pout ≥-20 dBmError Vector Magnitude
< -31 dBc @ 5 MHz & < -41 dBc @ 10 MHz
when Interference CW Signal Level = -40 dBc
Transmit
Intermodulation
< -36 dBm / 1 kHz RW @ 9 kHz ≤f < 150 kHz
< -36 dBm / 10 kHz RW @ 150 KHz ≤f < 30 MHz
< -36 dBm / 100 kHz RW @ 30 MHz ≤f < 1 GHz
< -30 dBm / 1 MHz RW @ 1 GHz ≤f < 12.75 GHz
< -41 dBm / 300 kHz RW @ 1893.5 MHz < f < 1919.6 MHz
< -67 dBm / 100 kHz RW @ 925 MHz ≤f≤935 MHz
< -79 dBm / 100 kHz RW @ 935 MHz < f ≤960 GHz
< -71 dBm / 100 kHz RW @ 1805 MHz ≤f≤1880 MHz
Spurious Emissions
|f-fc| > 12.5 MHz
> 33 dB @ 5 MHz,
> 43 dB @ 10 MHz
Adjacent Channel
Leakage
Power Ratio (ACLR)
< 5 MHz at 3.84 Mcps (99% of power)
Occupied Bandwidth
< -50 dBm /3.84 MHz
Minimum Transmit
Power
Normal Conditions : within 9 dB,
Extreme Conditions : within 12 dB
Open Loop Power
Control
within 0.1 PPMFrequency Error
WCDMA850 : 824 MHz ~ 849 MHz
WCDMA900 : 880 MHz ~ 915MHz
WCDMA1900 : 1850 ~1910 MHz
WCDMA2100 : 1920 MHz ~ 1980 MHz
Transmit Frequency
SpecificationItem

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
3) Receiver - WCDMA Mode
< -57 dBm / 100 kHz BW @ 9 kHz ≤f < 1 GHz
< -47 dBm / 1 MHz BW @ 1 GHz ≤f≤12.75 GHz
Spurious Emissions
Adjust output(TPC command)
cmd 1dB 2dB 3dB
+1 +0.5/1.5 +1/3 +1.5/4
0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5
-1 -0.5/-1.5 -1/-3 -1.5/-4
group(10equal command group)
+1 +8/+12 +16/+24
Inner Loop Power Control
In Uplink
BER < 0.001 when Îor= -103.7 dBm / 3.84 MHz
& Iouw1 = -46 dBm @ Fuw1(offset) = 10 MHz
& Iouw2 = -46 dBm / 3.84 MHz @ Fuw2(offset) = 20 MHz
Intermodulation
BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz & Iblocking = -44 dBmSpurious Response
BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz
& Iblocking = -56 dBm / 3.84 MHz @ Fuw(offset) = 10 MHz
or Iblocking = -44 dBm / 3.84 MHz @ Fuw(offset) = 15 MHz
Blocking Characteristic
ACS > 33 dB where BER < 0.001 when Îor = -92.7 dBm / 3.84 MHz
& Ioac = –52 dBm / 3.84 MHz @ 5 MHz
Adjacent Channel
Selectivity (ACS)
BER < 0.001 when Îor = -25 dBm / 3.84 MHzMaximum Input Level
BER < 0.001 when Îor = -106.7 dBm / 3.84 MHzReference Sensitivity Level
WCDMA850 : 849 MHz ~ 894 MHz
WCDMA900 : 925MHz ~ 960 MHz
WCDMA1900 : 1930 ~1990 MHz
WCDMA2100 : 2110 ~ 2170 MHz
Receive Frequency
SpecificationItem