LG GT500 User manual

Service Manual Model : GT500
Internal Use Only
Service Manual
GT500
Date: June, 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......................................................8
2.4 Current Consumption.................................................16
2.5 RSSI .........................................................................16
2.6 Battery Bar................................................................16
2.7 Sound Pressure Level ................................................17
2.8 Charging...................................................................18
3. Technical Description ..................................19
3.1 Digital Baseband (DBB) & Multimedia Processor..........19
3.2 Visual part.................................................................39
3.3 Audio Part.................................................................47
3.4 GPADC (General Purpose ADC) and AUTOADC2...........54
3.5 Charger control .........................................................55
3.6 Voltage Regulation.....................................................61
3.7 RF Technical Description ............................................62
4. TROUBLE SHOOTING..................................... 73
4.1 Power ON Trouble......................................................73
4.2 USB Trouble ..............................................................74
4.3 SIM Detect Trouble ....................................................75
4.4 MicroSD card Trouble ................................................76
4.5 Key and Touch Screen Trouble....................................77
4.6 Camera Trouble.........................................................81
4.7 Main LCD Trouble ......................................................87
4.8 Keypad Backlight Trouble ...........................................90
4.9 Audio Trouble Shooting ..............................................93
4.10 Charger Trouble Shooting.......................................108
4.11 Bluetooth Trouble...................................................111
4.12 Wi-Fi Trouble.........................................................114
4.13 GPS Trouble ..........................................................116
4.14 RF Component ......................................................119
4.15 Procedure to check ...............................................120
4.16 Checking Common Power Source Block..................121
4.17 Checking VCXO Block ............................................128
4.18 Checking Front End Module Block ..........................132
4.19 Checking Front End Module Block input logic ..........133
4.20 Checking WCDMA Block ........................................144
4.21 Checking GSM Block .............................................157
5. Download ................................................... 169
5.1 Requirements..........................................................169
5.2 GT500 / GT505 Download .......................................170
6. Block Diagram ........................................... 178
7. CIRCUIT DIAGRAM...................................... 179
8. BGA Pin Map ..............................................189
9. PCB LAYOUT ...............................................195
10. CALIBRATION............................................ 203
10.1 General Description ...............................................203
10.2 Environment..........................................................203
10.3 Calibration Environment .........................................204
10.4 Program Operation ................................................205
11. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................. 211
11.1 EXPLODED VIEW ...................................................211
11.2 Replacement Parts ................................................213
11.3 Accessory .............................................................243

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

- 5 -
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 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 © 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. 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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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
Item Specification
Shape GSM850/900/1800/1900 & WCDMA Band 1, 8
Bar type - Dual Mode Handset
Size 107 x 54.5 x 11.8 mm
Weight 98g (with standard battery)
Power 1000mAh Li-ion
Over 200 Min (WCDMA, Tx=10 dBm, Voice)
Over 200 Min (GSM, Tx=Max, Voice)
Over 300 hrs (WCDMA, DRX=7)
Over 300 hrs (GSM, Paging period=5)
Antenna Intenna type
Main LCD 3"(400x240), 262K TFT Color LCD
Main LCD BL White LED Backlight
Vibrator Yes (Coin Type)
Speaker Yes
MIC Yes (SMD Type)
Receiver Yes
Earphone Jack Yes
SIM Socket Yes(SIM Block Type) : 3.0V & 1.8V
Volume Key Push Type ( + , - )
Camera Key Push Type
External Memory Micro SD Socket
I/O Connect 5 Pins
Talk Time
Standby Time

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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)
* CLA : 12~24V (DC)
2.3 Radio Performance
1) Transmitter – GSM Mode
Item Spec. Unit
Voltage 3.7 (Typ), 3.4 (Min), (Shut Down: 3.2) V
Operating Temp. -20 ~ + 60 °C
Storage Temp. -30 ~ + 85 °C
Humidity max. 85 %
Item Spec. Min Typ. Max Unit
Power Available power 100 220 240 Vac
No
9k ~ 1GHz -39dBm
1G ~ 1710MHz -33dBm
1710M ~ 1785MHz -39dBm
1785M ~ 12.75GHz -33dBm
100k ~ 880MHz -60dBm 100k ~ 880MHz -60dBm
880M ~ 915MHz -62dBm 880M ~ 915MHz -62dBm
915M ~ 1000Mz -60dBm 915M ~ 1000MHz -60dBm
1G ~ 1.71GHz -50dBm 1G ~ 1.71GHz -50dBm
1.71G ~ 1.785GHz -56dBm 1.71G ~ 1.785GHz -56dBm
1.785G ~ 12.75GHz -50dBm 1.785G ~ 12.75GHz -50dBm
Item
1
DCS/PCSGSM
Conducted
Spurious
Emission
-39dBm
-33dBm
MS allocated
Channel
100k ~ 1GHz
Idle Mode
1G ~ 12.75GHz

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
No
30M ~ 1GHz -36dBm
MS allocated 1G ~ 1710MHz -30dBm
Channel 1710M ~ 1785MHz -36dBm
Radiated 1785M ~ 4GHz -30dBm
Spurious 30M ~ 880MHz -57dBm 30M ~ 880MHz -57dBm
Emission 880M ~ 915MHz -59dBm 880M ~ 915MHz -59dBm
Idle Mode 915M ~ 1000Mz -57dBm 915M ~ 1000MHz -57dBm
1G ~ 1.71GHz -47dBm 1G ~ 1.71GHz -47dBm
1.71G ~ 1.785GHz -53dBm 1.71G ~ 1.785GHz -53dBm
1.785G ~ 4GHz -47dBm 1.785G ~ 4GHz -47dBm
2
0 ~ 100kHz +0.5dB 0 ~ 100kHz +0.5dB
200kHz -30dB 200kHz -30dB
250kHz -33dB 250kHz -31dB
Due to 400kHz -60dB 400kHz -33dB
Output RF modulation 600 ~ 1800kHz -66dB 600 ~ 1800kHz -60dB
Spectrum 1800 ~ 3000kHz -69dB 1800 ~ 6000kHz -60dB
3000 ~ 6000kHz -71dB ≥6000kHz -73dB
≥6000kHz -77dB
400kHz -19dB 400kHz -22dB
600kHz -21dB 600kHz -24dB
1200kHz -21dB 1200kHz -24dB
1800kHz -24dB 1800kHz -27dB
1
DCS/PCSGSM
-36dBm
-30dBm
30M ~ 1GHz
1G ~ 4GHz
Item
Frequency Error ±0.1ppm ±0.1ppm
3 Phase Error ±5(RMS) ±5(RMS)
±20(PEAK) ±20(PEAK)
Condition TU50: ±100Hz TU50: ±150Hz
3dB below reference sensitivity 3dB below reference sensitivity
Frequency Error Under RA250: ±200Hz RA250: ±250Hz
TU3: ±150Hz TU1.5: ±200Hz
5Due to
Switching
transient
4
Multipath and Interference HT100: ±100Hz HT100: ±250Hz

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. PERFORMANCE
No Item
800kHz
Power
control
Level
Power
(dBm)
Tolerance
(dB)
Power
control
Level
Power
(dBm)
Tolerance
(dB)
533±3030±3
631±3128±3
729±3226±3
827±3324±3
925±3422±3
10 23 ±3 5 20 ±3
11 21 ±3 6 18 ±3
12 19 ±3 7 16 ±3
13 17 ±3 8 14 ±3
14 15 ±3 9 12 ±4
15 13 ±3 10 10 ±4
16 11 ±5 11 8 ±4
17 9 ±5 12 6 ±4
18 7 ±5 13 4 ±4
19 5 ±5 14 2 ±5
15 0 ±5
9 Burst timing
GSM DCS/PCS
Frequency offset
Intermodulation product should
be Less than 55dB below the
level of Wanted signal
Mask IN
Intermodulation
attenuation –7
8Transmitter
Output Power
Mask IN

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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) Transmitter – WCDMA Mode
No Item Specification
1 Maximum Output Power Class3: +24dBm(+1/-3dB)
Class4: +21dBm(±2dB)
2 Frequency Error ±0.1ppm
3 Open Loop Power control in uplink ±9dB@normal, ±12dB@extreme
4 Inner Loop Power control in uplink
Adjust output (TPC command)
cmd 1dB 2dB 3dB
+1 +0.5/1.5 +1/3 +1.5/4.5
0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5
-1 -0.5/-1.5 -1/-3 -1.5/-4.5
group(10equal command group)
+1 +8/+12 +
5 Minimum Output Power -50dBm(3.84MHz)
6 Out-of-synchronization handling of output power
Qin/Qout:DPCCH quality levels
Toff@DPCCH/lor:-22->-28dB
Ton@DPCCH/lor:-24->-18dB
7 Transmit OFF Power -56dBm(3.84M)
8 Transmit ON/OFF Time Mask ±25us
PRACH, CPCH, uplink compressed mode
9 Change of TFC
±25us
power varies according to the data rate
DTX: DPCH off
(minimize interference between UE)
10 Power setting in uplink compressed ±3dB(after 14slots transmission gap)
11 Occupied Bandwidth(OBW) 5MHz(99%)
12 Spectrum emission Mask
-35-15*(∆f-2.5)dBc@∆f=2.5~3.5MHz, 30k
-35-1*(∆f-3.5)dBc@∆f=3.5~7.5MHz, 1M
-39-10*(∆f-7.5)dBc@∆f=7.5~8.5MHz, 1M
-49 dBc@∆f=8.5~12.5MHz, 1M