LG FM300 User manual

Internal Use Only
Service Manual
FM300
Date: January, 2011 / Issue 1.0

- 2 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information.........................................................................3
1.3 Abbreviations.............................................................................................5
2. PERFORMANCE...................................................................... 8
2.1 H/W Features..............................................................................................8
2.2 LTE Technical Specification (TS 36.101 v10.0.0)............................9
3. TECHNICAL BRIEF................................................................ 12
3.1 MAIN........................................................................................................... 12
3.2 LTE(SUB) .................................................................................................... 19
4. TROUBLE SHOOTING .......................................................... 24
4.1 Power on Trouble – 3.3V Main power........................................... 24
4.2 Power on Trouble – BCM Booting Trouble.................................. 27
4.3 Power on Trouble – 3.75V LTE power............................................ 31
4.4 SIM card Trouble.................................................................................... 35
4.5 Power LED Indication Trouble.......................................................... 41
4.6 Ethernet LED Indication Trouble..................................................... 43
4.7 RGB LED Indication Trouble .............................................................. 45
4.8 USB Connection Trouble .................................................................... 47
4.9 Ethernet Connection Trouble........................................................... 52
4.10 LTE RF Component (Primary)......................................................... 55
4.11 LTE VCXO Trouble................................................................................ 56
4.12 LTE Tx Trouble....................................................................................... 58
4.13 Power on Trouble – LTE Booting Trouble .................................. 60
4.14 Memory Trouble shooting.............................................................. 64
5. DOWNLOAD......................................................................... 67
6. BLOCK DIAGRAM................................................................. 73
7. CIRCUIT DIAGRAM .............................................................. 74
8. BGA PIN MAP ...................................................................... 85
9. PCB LAYOUT......................................................................... 86
10. CALIBRATION..................................................................... 90
10.1 LTE AUTO CALIBRATION................................................................... 90
11. STAND ALONE TEST .......................................................... 97
11.1 Introduction.......................................................................................... 97
12. EXPLODED VIEW & REPLACEMENT PART LIST ............... 99
12.1 EXPLODED VIEW.................................................................................. 99
12.2 Replacement Parts ...........................................................................101
12.3 Accessory .............................................................................................128

- 3 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
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
na thori ed se The man fact rer does not arrant that this prod ct is imm ne from the abo e case b t
u
na
u
thori
z
ed
u
se
.
The
man
u
fact
u
rer
does
not
w
arrant
that
this
prod
u
ct
is
imm
u
ne
from
the
abo
v
e
case
b
u
t
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.
1. INTRODUCTION

- 4 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
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. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from
unsuppressed engines or electric motors may cause problems.
G. 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.

- 5 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1.3 Abbreviations
1. INTRODUCTION
For the purposes of this manual, following abbreviations apply:
Automatic Power ControlAPC
Ad
j
acent Channel Selectivit
y
ACS
Adjacent Channel Leakage RatioACLR
Bit Error RatioBER
BasebandBB
Additive White Gaussian NoiseAWGN
Additional Maximum Power ReductionA-MPR
j y
Constant Current – Constant VoltageCC-CV
Base StationBS
Cyclic PrefixCP
dB relative to 1 milli wattdBm
Di it l C i ti S t
DCS
Digital to Analog ConverterDAC
Continuous WaveCW
Downlink Control InformationDCI
Electrical Erasable Programmable Read
-
Only Memory
EEPROM
Digital Signal ProcessingDSP
Di
g
it
a
l
C
ommun
i
ca
ti
on
S
ys
t
em
DCS
Downlink
DL
E-UTRA Absolute Radio Frequency Channel NumberEARFCN
Electrostatic DischargeESD
Electrical
Erasable
Programmable
Read
-
Only
Memory
EEPROM

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Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
Error Vector MagnitudeEVM
Evolved UMTS Terrestrial Radio Access NetworkEUTRAN
Evolved UMTS Terrestrial Radio AccessE-UTRA
Energy Per Resource ElementEPRE
Global System for Mobile Communications
GSM
General Purpose Interface BusGPIB
Gaussian Minimum Shift KeyingGMSK
Flexible Printed Circuit BoardFPCB
Frequency Division DuplexFDD
Low Drop Output
LDO
Liquid Crystal DisplayLCD
Intermediate FrequencyIF
International Portable User IdentityIPUI
Global
System
for
Mobile
Communications
GSM
Offset Phase Locked Loop
OPLL
Light Emitting DiodeLED
Low
Drop
Output
LDO
Modulation and Coding SchemeMCS
Orthogonal Frequency Division Multiple AccessOFDMA
Offset
Phase
Locked
Loop
OPLL
Phase Locked Loo
p
PLL
Programmable Gain AmplifierPGA
Printed Circuit BoardPCB
Power Amplifier ModulePAM
Public Switched Telephone NetworkPSTN
p

- 7 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
Radio FrequencyRF
Real Time ClockRTC
Root Mean SquareRMS
Receiving Loudness RatingRLR
Reference SignalRS
Static Random Access MemorySRAM
Sending Loudness RatingSLR
Subscriber Identity ModuleSIM
Surface Acoustic WaveSAW
Travel AdapterTA
Side Tone Masking RatingSTMR
Pseudo SRAMPSRAM
Signal-to-Noise RatioSNR
Universal Asynchronous Receiver/TransmitterUART
Time Division Multiple AccessTDMA
Time Division DuplexTDD
User EquipmentUE
Wireless Application Protocol
WAP
Voltage Control Temperature Compensated Crystal OscillatorVCTCXO
Voltage Controlled OscillatorVCO
UplinkUL

2. PERFORMANCE
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Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
2.1 H/W Features
2. PERFORMANCE
Item Feature Comment
Standard Battery No: use external power adapter
Talk Current Under 450mA: LTE power 22.5dBm
Stand by Current Under 250mA: LTE network
Ch i ti
N t l d t
Ch
arg
i
ng
ti
me
N
o: use ex
t
erna
l
power a
d
ap
t
er
RX Sensitivity LTE: -101dBm(BW10MHz)
TX output power LTE:22.5dBm (class3)
SIM card type 8pin push-push type
Display No: LED indicators only
Power Indicator
Blinking white Start up or new firmware is being
Power
Indicator
Blinking
white
:
Start
up
or
new
firmware
is
being
downloaded. Do not turn off or reboot the device
during the process.
Solid white: Normal operation
Off: Power off
Signal Indicator Red: Internet connection is not available. Weak
signal strength
ll l bl d
Ye
ll
ow: Internet connection is avai
l
a
bl
e. Me
d
ium
signal strength
Green: Internet connection is available. Strong
signal strength
ANT External
Ear phone jack No: only CPE
Speech coding No: only CPE
Vibrator No: only CPE
Loud Speaker No: only CPE
Microphone No: only CPE
Speaker/Receiver No: only CPE
T
ravel Adapter Yes: External power source
MIDI No: only CPE
2. PERFORMANCE

2. PERFORMANCE
- 9 - Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2.2 LTE Technical Specification (TS 36.101 v10.0.0)
2. PERFORMANCE
It
S ifi ti
It
em
S
pec
ifi
ca
ti
on
Transmit Frequency E-UTRA Band 20
832MHz ~ 862MHz
Maximum Output Power +23 dBm , ·2 dB (class 3)
Frequency Error |Δf| ≤ (0.1 PPM + 15 Hz)
Open Loop Power Control Normal Conditions : within ·9 dB,
Extreme Conditions : within ·12 dB
Minimum Output Power < -40 dBm
Occupied Bandwidth 10 MHz
Channel Bandwidth 10 MHz
d
Adjacent Channel Leakage
Power Ratio (ACLR)
UTRAACLR1 33
d
B
Adjacent channel center frequency offset
(in MHz) + / - 7.5 MHz
UTRAACLR2 36 dB
Adjacent channel center frequency offset
(in MHz) + / - 12.5 MHz
E-UTRAACLR 30 dB
Adjacent channel center frequency offset
(in MHz) + / - 10 MHz
E-UTRA channel Measurement bandwidth 9 MHz
UTRA 5MHz channel Measurement
bandwidth 3.84 MHz
BW Channel 10 MHz
Interference Signal Frequency Offset
10 MHz
20MHz
Transmit Intermodulation
Interference
Signal
Frequency
Offset
10
MHz
20MHz
Interference CW Signal Level - 40 dBc
Intermodulation Product -29 dBc -35 dBc
Measured Bandwidth 9 MHz 9 MHz

2. PERFORMANCE
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Only for training and service purposes
LGE Internal Use Only
2. PERFORMANCE
Item
Specification
Item
Specification
Error Vector Magnitude < 17.5 %, when Pout ≥ -40 dBm (for BPSK or QPSK)
< 12.5 %, when Pout ≥ -40 dBm (for 16QAM)
EVM equalizer Spectrum
Flatness
If FUL_measurement - FUL_low ≥ 3MHz
and
If FUL_high - FUL_measurement ≥ 3 MHz
Æ+2/-2 dB
If FUL_measurement - FUL_low < 3 MHz
or
or
If FUL_high - FUL_measurement < 3 MHz
Æ+3/-5 dB
ΔfOOB boundary between E-UTRA channel and spurious emission
domain for 10 MHz channel bandwidth = 15 MHz
Frequency Range Maximum Level Measurement
Bandwidth
Transmitter Spurious
Emission
9 kHz df < 150 kHz -36 dBm 1 kHz
150 kHz df < 30 MHz -36 dBm 10 kHz
30 MHz df < 1000 MHz -36 dBm 100 kHz
1 GHz df < 12.75 GHz -30 dBm 1 MHz