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AS740
Service Manual
216 pgs29.09 Mb0
User Manual 2
308 pgs6.48 Mb0
Specifications
2 pgs1.34 Mb0
Owner's Manual [es]
309 pgs11.31 Mb0

LG AS740 Service Manual

CDMA Mobile Subscriber Unit AS740
SERVICE MANUAL
SINGLE BAND
[CELLULAR]
CDMA MOBILE PHONE
Copyright©2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only
Only for training and service purpose.
Tabl
Of C
2
4
4.11
Touch
Sensor
trouble
...................................
156
3.7
Display
38
4.53M
Camera
trouble
138
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AS740
e
1. Introduction .........................................2
1.1 Purpose ...........................................................2
1.2 Regulatory Information ...................................2
.performance ........................................
2.1 Product Name ....................................................6
2.2 Supporting Standard .....................................6
2.3 Main Parts .........................................................6
2.4 HW Features ......................................................7
2.5 SW Features ......................................................8
2.6 US740 Figures ..................................................10
3. Technical brief ...................................11
3.1 Digital Baseband(DBB/MSM7627) ..........................15
3.2 Hardware Architecture ..........................................16
3.3 Memory support features(MSM7627) .................22
3.4 Power Block ........................................................23
3.5 H/W Sub System .................................................28
3.6 Audio and sound ..................................................33
...............................................................
3.8 Proximity Sensor ..................................................38
3.9 Auto Luminance Sensor .......................................38
3.10 Motion Sensor (accelerometer & Compass) ...........40
3.11 Vibrator (Motor) ..................................................40
3.12 CDMA RF Transmit/Receive Part ..........................43
3.13 Description of RX Part Circuit............................41
3.14 Description of Transmit Part Circuit ......................46
3.15 Description of Frequency Synthesizer Circuit...........47
ontents
4.9 Proximity Sensor on/off trouble.....................151
4.10 Motion Sensor on/off trouble .......................153
4.12 Camera Flash Trouble......................................157
5. Block diagram ................................159
6. Circuit Diagram .................................167
7. PCB Layout ........................................181
8. BGA Pin Map ...................................188
9. Calibration & RF Auto Test Program
(Tachyon).....................................190
10. Exploded view & Replacement part list .199
4. Trouble Shooting ................................48
4.1 CDMA RX Part Trouble .....................................48
4.2 CDMA TX Part Trouble .......................................74
4.3 Power trouble .....................................................116
4.4 Audio trouble ......................................................127
4.6 Main LCD trouble .................................................140
4.7 Key Troubleshooting ........................................143
4.8 Vibrator Troubleshooting ......................................149
..............................................
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AS740
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.
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
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AS740
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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AS740
Product Requirement SPEC.
OCT, 19, 2010
(RevA.0)
LG Electronics Inc.
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AS740 Product SPEC
− Contents −
1. Product Name ……………………………………………………………6
2. Supporting Standard …………………………………………………..6
3. Main Parts ………………………………………………………………….6
4. H/W Features ………………………………………………………………7
5. S/W Features …………………………………………………………….. 8
6. AS740 Figures …………………………………………………………... 10
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AS740 Product SPEC
1. Product Name
AS740 : US Cellular/US PCS + GPS
(EVDO Rev_0 / EVDO Rev_A)
2. Supporting Standard
Item Feature Comment
Supporting Standard
US Cellular / US PCS/GPS
Frequency Range US Cellular TX : 824.82 ~ 848.19 MHz
US Cellular RX : 869.82~893.19 MHz US PCS TX : 1850~1910 MHz US PCS RX : 1930~1990 MHz GPS : 1575.42 MHz
3. Functions of Major Semi-Conductors
Classification Function MSM7627 Terminal operation control and digital signal processing Memory (H8BES0UU0MCR)
NAND Flash Memory (4G) + SDRAM (4G) Storing of terminal operation program
RTR6500 Converts Rx and Tx RF signal to baseband signal
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AS740 Product SPEC
4. HW Features
Item Feature Comment Form Factor Horizontal Slide QWERTY Battery 1) Capacity
Standard : Li-Ion polymer, 1500mAh
2) Packing Type : Soft Pack
Size Standard : 116 x 56.5 x 15.9 Weight 161.1g
Volume TBD PCB 3-8 Staggered 10 Layers , 0.8t Stand by time CDMA DCN/PCS Up to 450 hrs @ SCI=2(pwr: -75dBm) Charging time 200 min @ Power Off/ 1500mAh Talk time CDMA Up to 400mins @ Rx pwr -92dBm LCD 3.2” WVGA (800x480 pixel) 260K TFT
LCD
Built-in Camera
3.2Mega Auto Focus Camera with
Flash Status Indicator RGB indicator Keypad Main Side Slide Qwerty
Function Key : 6
Side Key : 3
ANT Main : Internal Fixed Type System connector 5 Pin Ear Phone Jack
4pole, 3.5Φ Ear Jack Memory NAND Flash : 4Gbit
SDRAM : 4Gbit Speech coding FR, EFR, HR,AMR Data & Fax Built in Data & Fax support Vibrator Built in Vibrator Blue Tooth V2.1 + EDR MIDI(for Buzzer
SW decoded
Function) Music Player MP3/AAC/AAC+ Video Player H.263, H.264, MPEG-4, DivX, WMV
3.2M AF / Digital Zoom : x4
Function Key: Back,Search Call,Home,Menu,End Side Key : Volume up/down,CAM
Camcorder MPEG-4 Voice Recording Yes
Speaker Phone mode
Yes Support Travel Adapter Yes CDROM Yes Stereo Headset Yes
Data Cable Yes T-Flash
Yes (External Memory)
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AS740 Product SPEC
5. SW Features
Item Feature Comment RSSI Yes Battery Charging Yes Key Volume No Audio Volume Yes Time / Date Display Yes Multi-Language Yes English, Spanish Quick Access Mode Camera PC Sync No Speed Dial No Profile No CLIP / CLIR No Phone Book Given Name/Family Name/
Phone: Home/Mobile/Work/Work Fax/Home Fax/Pager/other/Custom Email: Home/Work/Other/Custom IM: AIM/Windows Live/Yahoo/Skype/QQ/Google Talk/ICQ/Jabber/Custom Postal address: Home/Work/Other/Custom Organization: Work/Other/Custom Notes Nickname Website
Last Dial Number Yes Last Dial Numbers, Last
Last Received
Yes Last Dial Numbers, Last
Number
Last Missed Number Yes Last Dial Numbers, Last
Search by Number
Name / Name Group Yes There is no limitation on the
Fixed Dial Number No Service Dial Number No Own Number No Voice Memo Yes Support voice recorder
There is no limitation on the number of items. It depends on Available memory amount.
Received Numbers and Last Missed Numbers can store.
Received Numbers and Last Missed Numbers can store .
Received Numbers and Last Missed Numbers can store.
number of items. It depends on available memory amount.
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AS740 Product SPEC
Call Reminder No Network Selection Automatic /Manual
Mute Yes Call Divert No 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. SMS Over GPRS Yes EMS Melody / Picture Send / Receive / Save MMS MPEG4 Send / Receive / Save
No
No
Yes
Yes Long Message Yes
Cell Broadcast No Download GOTA Game No Calendar Yes Memo No World Clock Yes Unit Convert No Stop Watch No Wall Paper Yes WAP Browser No Support HTML Browser Download Melody /
Yes Android Market Wallpaper SIM Lock No SIM Toolkit No MMS Yes EONS No CPHS No Camera Yes 3.2M AF JAVA No Voice Dial Yes IrDa No Bluetooth Yes Ver. 2.1+EDR
FM radio No
EMS does not support.
(HSP,HFP,A2DP,AVRCP,OPP,FTP)
Hold / Retrieve Yes Conference Call Yes Max. 3 DTMF Yes Memo pad No TTY Yes AMR Yes
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AS740 Product SPEC
SyncML No IM Yes Google Talk Email Yes
6. AS740 Figures
Displ
480
800 pixel
262K Col
TFT
PMIC : Power control, Charger controller, Battery Voice Safety
pp
pp
y
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1. Main Features
1. LG-AS740 Main Features
Side Slide Qwerty type Main Chipset : MSM7627, Memory(4Gbits NAND Flash + 4Gbits
DDR SDRAM)
ay : 3.2”,
x
s,
ors,
CMX 4.0 compliant(72 Poly) OS : Android V2.1 Eclair Camera : Built-in Camera (3.0M AF pixels, CMOS Image sensor)
with Flash
Recording/Memo/Playback, Voice Recognition System
E911(gpsOne), TTY/TDD Web Browser : Android Native Browser 3D Graphics GUI : Menu, Animations, Flash UI Su
ort Micro-SD Card : External Memory
Bluetooth 2.1 EDR WLAN 802.11 b/g/n
Camera &
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2. Main Components
2. LG-AS740 Main Component
FLASH
T-Flash
socket
RF
PMIC
GPS
AUDIO
MSM7627
MEMORY
WIFI/BT
Micro USB
Main board, BOTTOM
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2. Main Components
2. LG-AS740 Main Component
3.2M
CAMERA
MOTOR
BATTERY
CONNECTOR
SPEAKER
CONTACT
Main board, Bottom
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2. Main Components
2. LG-AS740 Main Component
HALL IC
VOLUME
KEY
Qwerty IC
MAIN
CONNECTOR
Camera Key
Main board, Top
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3. Technical Brief
3. BB Technical Description
3.1 Digital Baseband(DBB/MSM7627)
3.1.1 General Description
A. Features(MSM7627)
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3. Technical Brief
3.2 Hardware Architecture
<TOTAL Block>
Figure. Simplified Block Diagram
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3. Technical Brief
3.2 Hardware Architecture
<Power Block>
Figure. Simplified Block Diagram
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3. Technical Brief
3.2 Hardware Architecture
<LCD Block>
Figure. Simplified Block Diagram
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3. Technical Brief
3.2 Hardware Architecture
<Camera Interface>
Figure. Simplified Block Diagram
NAND_CLE /
NAND_CLE /
DDR_SDRAM_CLK /
SD DETECT
DDR_SDRAM_CLK /
SD DETECT
SD_DETECTSD_DETECT
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3.2 Hardware Architecture
<External Memory>
EBI1 EBI2
EBI1 EBI2
3. Technical Brief
DDR
DDR DDR
SDRAM
SDRAM
SDRAM
2G Bit
2G Bit
4G Bit
External
External
External
Memory
Memory
Memory
D1 [0] ~ [31]
D1 [0] ~ [31]
A1 [0] ~ [13]
A1 [0] ~ [13]
DDR_SDRAM_DQS [0] ~ [3]
DDR_SDRAM_DQS [0] ~ [3]
DDR_SDRAM_CS0 /
DDR_SDRAM_CS0 /
DDR_SDRAM_BA [0] ~ [1]
DDR_SDRAM_BA [0] ~ [1]
DDR_SDRAM_CKE0
DDR_SDRAM_CKE0
DDR_SDRAM_WE /
DDR_SDRAM_WE /
DDR_SDRAM_RAS /
DDR_SDRAM_RAS /
DDR_SDRAM_CAS /
DDR_SDRAM_CAS /
DDR_SDRAM_DQM [0] ~ [3]
DDR_SDRAM_DQM [0] ~ [3]
DDR_SDRAM_CLK
DDR_SDRAM_CLK
SD_DATA [0] ~ [3]
SD_DATA [0] ~ [3]
SD_CMD
SD_CMD
SD_CLK
SD_CLK
MSM7627
MSM7627MSM7627
D2 [0] ~ [15]
D2 [0] ~ [15]
NAND_CS /
NAND_CS /
OE2 /
OE2 /
WE2 /
WE2 /
NAND_ALE /
NAND_ALE /
EBI1_RESOUT_N
EBI1_RESOUT_N
NAND_READY
NAND_READY
NAND
NAND
NAND
4G Bit
4G Bit
4G Bit
Figure. Simplified Block Diagram
Proximity Sensor
OXI_DOU
Proximity SensorProximity Sensor
OXI_DOU
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3.2 Hardware Architecture
<Sensor & Motor>
ACEL_CPAS_I2C_SCL
ACEL_CPAS_I2C_SCL
ACEL_CPAS_I2C_SDA
ACEL_CPAS_I2C_SDA
ACEL_INT
ACEL_INT
CPAS_INT /
CPAS_INT /
CPAS_RST
CPAS_RST
3. Technical Brief
6 Axis Sensor
6 Axis Sensor
MSM7627
MSM7627MSM7627
EL_EN
EL_EN
LIN_MOT_EN
LIN_MOT_EN
LIN_PWM_FREQ
LIN_PWM_FREQ
PROXI_I2C_SCL
PROXI_I2C_SCL
PROXI_I2C_SDA
PROXI_I2C_SDA
PR
PR
TOUCH_I2C_SCL
TOUCH_I2C_SCL
TOUCH_ATTN /
TOUCH_ATTN /
TOUCH_I2C_SDA
TOUCH_I2C_SDA
RGB_R [0] ~ [5]
RGB_R [0] ~ [5]
RGB_G [0] ~ [5]
RGB_G [0] ~ [5]
RGB_B [0] ~ [5]
RGB_B [0] ~ [5]
T
T
EL Driver
EL Driver
Motor
Motor
Driver
Driver
+EL_PWR
+EL_PWR
MOTOR+(U7501)
MOTOR+(U7501)
MOTOR - (U7502)
MOTOR - (U7502)
Touch Sensor
Touch SensorTouch Sensor
EL Sheet
EL SheetEL PAD
Motor
MotorMotor
RGB Indicator
RGB IndicatorRGB Indicator
Figure. Simplified Block Diagram
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3. Technical Brief
3.2.1 Architecture and baseband processing features
3.3 Memory support features
PM
7540
r
th
f
MSM
7627
RF
block(RTR
6500
)
d
TCXO
(
()(
g
p)
(under
-
voltage lockout and crystal oscillator signal presence) are monitored to protect against
23
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3.4. Power Block
3.4.1. General
MSM7627 is covered by PM7540(Qualcomm PMIC),
cove
Major power components are :
e powero
, memory,
3. Technical Brief
,an
.
PM7540(U40000) : Phone main PMIC BD6084(U4200) : LCD BLT Charge Pump NUS3116(F4500) : main power path switch( battery charging circuit) MAX14528
U4300):OVP(Overvoltageprotection)IC
3.4.2 PM7540
The PM7540 device (Figure) integrates all wireless handset power management. The power management portion accepts power from all the most common sources – battery, external charger, adapter, coin cell back-up – and generates all the regulated voltages needed to power the appropriate handset electronics. It monitors and controls the power sources, detecting which sources are applied, verifying that they are within acceptable operational limits, and coordinates battery and coin cell recharging while maintaining the handset electronics supply voltages. Eight programmable output voltages are generated using low dropout voltage regulators, all derived from a common trimmed voltage reference. A dedicated controller manages the TCXO warm-up and signal buffering, and key parameters
detrimental conditions. MSM7627 device controls and statuses the PM7540 IC using Single Serial Bus Interface (SSBI) supplemented by an Interrupt Manager for time-critical information. Another dedicated IC Interface circuit monitors multiple trigger events and controls the power-on sequence.
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3. Technical Brief
Figure. PM7540 Functional Block Diagram
These
pins
are
connected
to
the
Source
(or
emitter)
and
Drain
(or
collector)
contacts
of
the
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3. Technical Brief
3.4.3. Charging control
A programmable charging block in PM7540 is used for battery charging. It is possible to set limits for the charging current. The external supply typically connects directly to pin (VCHG). The voltage on this pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is applied or not. For additional accuracy or to capture variations over time, this voltage is routed internally to the housekeeping ADC via the analog multiplexer. PM7540 circuits monitor voltages at VCHARGER and ICHARGE pins to determine which supply should be used and when to switch between the two supplies.
pass transistor respectively.
NUS3116
U8210 Charging Control block
PM7540 only include charging controller.
So it is necessary external charging path TR.
PM7540 Input Power Management
This is NUS3116.
This part also include battery side power path.
NUS3116
ging
gg g
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3. Technical Brief
Constant Current Charging
The PM7540 IC supports constant current charging of the main battery by controlling the
charger pass transistor and the battery transistor. The constant current charging continues
until the battery reaches its target voltage, 4.2V.
Constant Voltage Charging
Constant voltage charging begins when the battery voltage reaches a target voltage, 4.2V.
The end of constant voltage charging is commonly detected 10% of the full charging
current.
• Charging Method : CC & CV (Constant Current & Constant Voltage)
• Maximum Char
Voltage : 4.2V
• Maximum Charging Current : 800mA
• Nominal Battery Capacity : 1500mAh
• Charging time : Max 3 Hours
• Full charge indication current (icon stop current) : 150mA
• Cut-off voltage : 3.50V
@ Battery icon display
Battery Bar Specification unit
BAR 6 --> 5 bar 90%
BAR 5 --> 4 bar 70%
BAR 4 --> 3 bar 50%
BAR 3 --> 2 bar 30%
BAR 2 --> 1 bar 15%
BAR 1 --> 0 bar 5%
Red LED indicator 10%
Cut off 0% -
%
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3. Technical Brief
Trickle Charging
Trickle Charging of the main battery, enabled through SBI control and powered from VDD, is
provided by the PM7540 IC, The trickle charger is on-chip programmable current source
that supplies current from V
to pin (VBAT). Trickle charging can be used for lithium-ion
DD
and nickel-based batteries, with its performance specified below (3.2V). The charging
current is set to 80mA.
Parameter Min Typ Max Unit
Trickle Current 60 80 100 mA
PM7540 Input Power Management
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3. Technical Brief
3.5.2. HS-USB
The universal serial bus (USB) is an interconnection standard widely supported by the
electronic industry. The USB2.0 spec defines data rates as low-speed (1.5 Mbps), full-
speed (12Mbps) and hi-speed (480 Mbps). When two devices are connected via a USB
interface, one of the devices must act as a host, and the other device must act as a
peripheral. The host is responsible for initiating and controlling traffic on the bus. The USB
specification requires personal computers (PCs) to act as hosts, and other devices such as
printers, keyboards, mice, etc. to act as peripherals. The OTG supplement creates a new
class of devices called OTG devices. OTG devices can act as either hosts or peripherals,
depending upon how they are connected and/or used.
The MSM7627A device contains a new USB high-speed function that is based on a
embedded UTMI+ core with a UTMI+ low pin interface (ULPI) compatible port. The MSM
device’s ULPI interface connects to an external ULPI PHY chip to complete the design. The
ULPI core embedded in the MSM along with the PM7540 IC and a USB high-speed PHY IC
provide support for the high-speed interface.
3.3V LDO3.3V LDO
USB_3.3V
USB_3.3V_EN
PM7540
VCHG_VBUS
HIGH
MSM7627
SPEED
USB_D+
Figure. USB block( MSM7627, MAX14528 )
USB_D­USB_ID
Connector
icro-USB 5pin M
The
power key is controlled by PM7540
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3. Technical Brief
3.5.3. KEY
3.5.3.1 Power key
3.5.3.2 key
PM7540
.
Figure. POWER KEY
The HOT Keys (Home & menu & END) are controlled by Qwerty IC (U9100).
Figure. HOT KEY
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