LG LG-A290 User manual

Internal Use Only
Service Manual
LG-A290
Date: January, 2012 / Issue 1.0

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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Table Of Contents
1. INTRODUCTION............................................................... 3
1.1 Purpose ................................................................................................3
1.2 Regulatory Information .................................................................3
1.3 Abbreviations.....................................................................................5
2. SYSTEM SPECIFICATION .................................................7
2.1 H/W Features......................................................................................7
2.2 Technical Specification...................................................................9
3. TECHNICAL BRIEF..........................................................14
3.1 Digital Main Processor................................................................. 14
3.2 Power Management .................................................................... 19
3.3 FEM with integrated Power Amplifier Module
(SKY77550, U400).......................................................................... 24
3.4 Clocks................................................................................................. 26
3.5 RFSYS of MT6253 (U101)............................................................ 28
3.6 MEMORY(PF38F5060M0Y3DK, U100 ).................................. 30
3.7 BT & FM Module(MT6626, U401) ........................................... 34
3.8 SIM Card Interface......................................................................... 38
3.9 Micro-SD Card Interface ............................................................. 41
3.10 LCD Interface................................................................................ 44
3.11 Battery Charger Interface / MUIC......................................... 46
3.12 Keypad Interface......................................................................... 48
3.13 Audio Front-End.......................................................................... 51
3.14 Camera Interface......................................................................... 55
3.15 KEY BACLKLIGHT LED Interface ............................................ 57
3.16 Vibrator Interface ........................................................................ 58
3.17 Torch LED Interface.................................................................... 59
4. TROUBLE SHOOTING ....................................................60
4.1 RF Component .............................................................................. 60
4.2 RX Trouble ....................................................................................... 61
4.3 TX Trouble........................................................................................ 65
4.4 Power On Trouble.......................................................................... 69
4.6 Vibrator Trouble ............................................................................. 74
4.7 LCD Trouble ..................................................................................... 76
4.8 Camera Trouble.............................................................................. 79
4.9 Speaker/ Receiver Trouble......................................................... 83
4.10 3.5φ Headset Trouble................................................................ 85
4.11 Microphone Trouble.................................................................. 88
4.12 SIM1 Card Interface Trouble................................................... 90
4.13 SIM2 Card Interface Trouble.................................................. 92
4.14 SIM3 Card Interface Trouble.................................................. 94
4.15 KEY backlight Trouble............................................................... 96
4.16 Torch Trouble................................................................................ 98
4.17 Micro SD Trouble ......................................................................100
4.18 Bluetooth Trouble ....................................................................102
4.19 FM Radio Trouble ....................................................................104
5. DOWNLOAD.................................................................106
6. BLOCK DIAGRAM.........................................................119
7. Circuit Diagram ...........................................................120
8 BGA PIN MAP ................................................................124
9. PCB LAYOUT.................................................................126
10. ENGINEERING MODE ................................................128
11 RF CALIBRATION ........................................................129
11.1 Configuration of Tachyon .....................................................129
11.2 How to use Tachyon.................................................................131
12 EXPLODED VIEW & REPLACEMENT PART LIST ........133
12.1 EXPLODED VIEW........................................................................133
12.2 ReplacementParts ....................................................................134
12.3 Accessory .....................................................................................151

1. INTRODUCTION
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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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 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.

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LGE Internal Use Only Copyright © 2012 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. 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.
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1. INTRODUCTION
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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current – Constant Voltage
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milli watt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GSM Global System for Mobile Communications
IPUI International Portable User Identity
IF Intermediate Frequency
LCD Liquid Crystal Display
LDO Low Drop Output
LED Light Emitting Diode
OPLL Offset Phase Locked Loop
PAM Power Amplifier Module

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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. INTRODUCTION
PCB Printed Circuit Board
PGA Programmable Gain Amplifier
PLL Phase Locked Loop
PSTN Public Switched Telephone Network
RF Radio Frequency
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock
SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
PSRAM Pseudo SRAM
STMR Side Tone Masking Rating
TA Travel Adapter
TDD Time Division Duplex
TDMA Time Division Multiple Access
UART Universal Asynchronous Receiver/Transmitter
VCO Voltage Controlled Oscillator
VCTCXO Voltage Control Temperature Compensated Crystal Oscillator
WAP Wireless Application Protocol

2. PERFORMANCE
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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. SYSTEM SPECIFICATION
2.1 H/W Features
Item Feature Comment
Standard Battery Lithium Ion, 3.7V 1500mAh
Stand by TIME >450 hr., Min.@PP9
Stand by time >500 hr., Min.@PP5
Talk time
>6.0hr., Min.@GSM900, PL=5
>14.0 hr., Min.@GSM900, PL=13
>8 hr., Min.@DCS, PL=0
>14 hr., Min.@DCS, PL=9
Charging time Approx. 3 hours 30 min.
RX Sensitivity GSM, EGSM: -109dBm, DCS: -109dBm
TX output power GSM, EGSM: 32.3dBm(Level 5),
DCS , PCS: 29.5dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V Small
Display MAIN : TFT 176 × 220(QCIF) pixel 262K Color
Status Indicator
KEY TOTAL 22EA
Hard icons. Key Pad
Numeric(12EA : 0 ~ 9, #, *) Navigation Key OK Key(5EA)
Menu Key, Clear Key, Send Key, End Key,
SIM Switch Key(5EA)
ANT Internal
EAR Phone Jack Yes(3.5Ø)
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Loud Speaker Yes
Voice Recoding Yes

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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
Item Feature Comment
Microphone Yes
Speaker/Receiver 18 x 12 Speaker/Receiver
Travel Adapter Yes
MIDI SW MIDI (Mono SPK)
Camera 1.3M
Bluetooth / FM Radio Bluetooth version 2.1 / 76~108MHz supported

2. PERFORMANCE
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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2.2 Technical Specification
Item Description Specification
1 Frequency Band
GSM850
TX: 824 ~ 849 MHz
RX: 869 ~ 894 MHz
DCS
TX: 1710 ~ 1785 MHz
RX: 1805 ~ 1880 MHz
PCS
TX: 1850 ~ 1910 MHz
RX: 1930 ~ 1990 MHz
EGSM
TX: 880 ~ 915MHz
RX: 925 ~ 960 MHz
2 Phase Error RMS < 5 degrees
Peak < 20 degrees
3 Frequency Error < 0.1ppm
4 Power Level
GSM850 / EGSM
Level Power Toler. Level Power Toler.
5 33 dBm ±2dB 13 17 dBm ±3dB
6 31 dBm ±3dB 14 15 dBm ±3dB
7 29 dBm ±3dB 15 13 dBm ±3dB
8 27 dBm ±3dB 16 11 dBm ±5dB
9 25 dBm ±3dB 17 9 dBm ±5dB
10 23 dBm ±3dB 18 7 dBm ±5dB
11 21 dBm ±3dB 19 5 dBm ±5dB
12 19 dBm ±3dB
DCS / PCS
Level Power Toler. Level Power Toler.
0 30 dBm ±2dB 8 14 dBm ±3dB
1 28 dBm ±3dB 9 12 dBm ±4dB
2 26 dBm ±3dB 10 10 dBm ±4dB
3 24 dBm ±3dB 11 8 dBm ±4dB
4 22 dBm ±3dB 12 6 dBm ±4dB
5 20 dBm ±3dB 13 4 dBm ±4dB
6 18 dBm ±3dB 14 2 dBm ±5dB
7 16 dBm ±3dB 15 0 dBm ±5dB

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LGE Internal Use Only Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
Item Description Specification
5Output RF Spectrum
(due to modulation
GSM850 / EGSM
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600 ~ <1,200 -60
1,200 ~ <1,800 -60
1,800 ~ <3,000 -63
3,000 ~ <6,000 -65
6,000 -71
DCS/ PCS
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600 ~ <1,200 -60
1,200 ~ <1,800 -60
1,800 ~ <3,000 -65
3,000 ~ <6,000 -65
6,000 -73
6Output RF Spectrum
(due to switching transient)
GSM850 / EGSM
Offset from Carrier (kHz). Max. dBm
400 -19
600 -21
1,200 -21
1,800 -24