LG GB115 User manual

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GB115
GB115 GB115
GB115
Service Manual
Service ManualService Manual
Service Manual
LG Electronics

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Table Of Contents
1. INTRODUCTION……………….…3
1.1 Purpose……………………………..……3
1.2 Regulatory Information……………..…...3
2. PERFORMANCE………………..…5
2.1 H/W Features………………………..…..5
2.2 S/W Features………………………….…6
3. TECHNICAL BRIEF…………..….13
3.1 Digital Main Processor( PMB7890 )….……..13
3.2 Memory chip ( S71GL064NA0BFW0Z0 )….……18
3.3 Power Amplifier Module ( SKY77518 ) …...21
3.4 RF SAW (B9308)……….………………22
3.5 Audio Amplifier (TPA6205A1)……..….23
3.6 Charger IC (MP26021)……………...….24
3.7 Camera Driver (AIT701A)……...….…...26
3.8 FM Radio (Si4703)………………..…....30
3.9 LCD Interface…………………………..32
3.10 SIM Card Interface……………..….….34
3.11 KEYPAD Interface…………….…..….35
3.12 Key LED Interface………….…..…….36
3.13 Vibrator Interface…………….…….…37
3.14 Micro SD Interface….…………….….38
4. TROUBLE SHOOTING…….…….39
4.1 Power On Trouble……………………...39
4.2 SIM Card Trouble…………………..….42
4.3 Vibrator Trouble…………………….….44
4.4 Keypad Trouble………………………...46
4.5 RTC Trouble……………………………48
4.6 Key Backlight Trouble……………….…50
4.7 LCM Backlight Trouble………….…….53
4.8 LCM Trouble…………………………...55
4.9 Microphone Trouble……………………57
4.10 Receiver Trouble………………………59
4.11 Speaker Trouble………………………..61
4.12 Headphone Trouble……………………63
4.13 Charging Trouble……………………....67
4.14 FM Radio Trouble……………………..69
4.15 Camera Trouble………………………..75
4.16 Micro SD Trouble……………………..78
4.17 RF Trouble…………………………..80
5. DOWNLOAD………………………93
5.1 Download setup………………………...93
5.2 Download Process………………………95
6. BLOCK DIAGRAM……………...106
7. CIRCUIT DIAGRMA…………….107
8. BGA IN PIN Check……………….113
9. PCB LAYOUT…………………….116
10.ENGINEERING MODE…………118
11.CALIBRATION…………………..120
11.1 Test equipment setup………….…..….120
11.2 APT Technologies………………..…...120
12. Stand alone test………………..…135
12.1 Test Program Setting………………....135
12.2 TX Test …………………………..…..137
12.3 RX Test…………………………….....138
13. EXPLODED VIEW&
REPLACEMENT PART LIST…..…139
13.1 Exploded View…………………….….139
13.2 Replacement Part…………………..…142

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1. INTRODUCTION
1.1 Purpose
This manual provides information necessary to repair, 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 dose not warrant that this
product is immune from the above case but will prevent unauthorized use of common-carrier
telecommunications 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 authorized alternations or repair may affect the regulatory status of the system and
may void any remaining warranty.

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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 Devices(ESD),are indicated by the sign .
Following information is ESD handing:
. 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 packages as
described.

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2. PERFORMANCE
2.1 H/W Features
Solution EGOLD Voice v2 (ULC2+) Infineon
Type Bar type
Antenna Type Internal (dual-Band)
Main Display 1.5” 128x128 CSTN/65k
Camera Yes, VGA
Battery 950mAh Li-ion inner pack 950mAh: 55x34x50mm
FM Receiver Yes , US/Europe band support (87.5~108MHz)
Embedded FM antenna Yes Pogo pin contact FPC type FM
Antenna on Battery cover.
Loud Speaker Yes
Memory Size 64Mb+16Mb User memory at least 1MB
Memory Card
Yes, Micro SD (up to 2GB) Flip type u-SD holder under
battery
LMT (Lost Mobile Tracker) Yes LMT for: AMA
M-DOG: China