LG C3600 User manual

Table of Contents
1. INTRODUCTION .........................................................................................1
1.1 Purpose................................................................................................................ 1
1.2 Regulatory Information......................................................................................... 1
2. SYSTEM SPECIFICATION..........................................................................3
3. LG-C3600 TECHNICAL BRIEF....................................................................4
3.1 LG-C3600 Block Diagram.................................................................................... 4
3.2 RF Part................................................................................................................. 5
3.3 BaseBand Transmit Section................................................................................. 6
3.4 BaseBand Receive Section.................................................................................. 6
4. LG-C3600 TROUBLE SHOOTING..............................................................7
4.1 RF Components................................................................................................... 7
4.2 RX Trouble........................................................................................................... 8
4.2.1 Check ANT Feedback Points..................................................................... 8
4.2.2 Check Regulator Circuit............................................................................. 8
4.2.3 Check VCTCXO Circuit.............................................................................. 9
4.2.4 Check Antenna Switch & Mobile Switch....................................................10
4.2.5 Check SAW Filter......................................................................................11
4.2.6 Checking Receive IQ................................................................................12
4.3 TX Trouble ..........................................................................................................13
4.3.1 Check LDO Circuit....................................................................................13
4.3.2 Check VCTCXO Circuit.............................................................................13
4.3.3 Check Transmit IQ....................................................................................13
4.3.4 Check PAM Control Signal........................................................................14
4.3.5 Check Antenna Switch and Mobile Switch................................................15
4.4 Power On Trouble...............................................................................................15
4.5 Charging Trouble ................................................................................................17
4.6 LCD Trouble....................................................................................................... 19
4.6.1 LCD Blue Screen..................................................................................... 19
4.6.2 LCD Blank Screen or Abnormal Screen................................................... 19
4.7 Camera Trouble..................................................................................................20
4.8 Color LED Trouble ..............................................................................................21
4.9 KEYPAD Blacklight LEDS Trouble......................................................................22
4.10 SIM Trouble.......................................................................................................23
4.11 Ear Jack Trouble ...............................................................................................24
4.12 Speaker/Receiver Trouble.................................................................................26
5. DOWNLOAD AND CALIBRATION .............................................................28
6. CIRCUIT DIAGRAM & PCB LAYOUT…………………………………………29
7. EXPLODED VIEW & REPLACEMENT PART LIST………………………….36

1. INTRODUCTION
1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and
download the features of LG-C3600.
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 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 are resulted from such unauthorized use.
B. 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 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.
C. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its
authorized agent. Therefore, note that unauthorized alternations or repair may affect the
regulatory status of the system and may void any remaining warranty.
D. 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.
E. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.
Interference from unsuppressed engines or electric motors may cause problems.
F. Electrostatic Sensitive Devices
1

1. INTRODUCTION
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.
2

2. SYSTEM SPECIFICATION
2. SYSTEM SPECIFICATION
Item Target Specification
Form Factor Folder Type
Standard Battery (1000mAh , Li-ion)
Size：34(W)×50(H)×5.5(T) mm
Weight：25g
Size 88 X 44 X 23mm
Weight 88.35 Gram(with standard battery)
Standby Current Below 4.5mA under the least current consumption
(e.g. Paging Period = 9)
Talk Time Up to 3 hrs (GSM Tx Lev:5)
Standby Time Up to 200 hrs : Paging Period 9, RSSI 85dBm
Antenna Internal
LCD Main LCD：CSTN 128×160 Pixels 65K Color
Sub LCD: CSTN 96×64 Pixels 65K Color
Back Light Blue LED
PC Sync Yes
Indicator LED None
Vibrator Yes (Cylinder Type)
Buzzer Yes
C-MIC Yes
Receiver Yes
Earphone Jack Yes (Stereo)
SIM Socket Yes (SIM Block Type)
Volume Key Yes
Voice Key Yes
MP3/AAC Yes
MIDI 64 MIDI
I/O Connector 24Pin
Basic Accessory Travel Adaptor
Standard Battery (1000mAh , Li-ion)
Ear-mic
Data Cable
3

3. TECHNICAL BRIEF
3. LG-C3600 TECHNICAL BRIEF
3.1 LG-C3600 Block Diagram
Figure 3-1 LG-C3600 top level block diagram
The Figure 3-1 shows the top level block diagram of LG-C3600, it contains RF and BB part.
The following list is the detailed:
1. AD6527B : ADI digital baseband chipset
2. AD6537B : ADI analog baseband and power supply chipset
3. SI4205 : RF transmitter chipset
4. NEC9993 : NEC MP3 and Midi chipset
5. RD38F4455LLZDQ0 : 256Mb + 256Mb intel Flash memory chipset
6. CL761S : Camera module
7. Others:
A. 24 main key, 3 MP3 play key and 2 side key.
B. 128 x 160 65K CSTN –LCD module
C. Vibrator
D. Mic
E. Speaker and receiver
F. Ear-jack
G. Sim socket
H. Battery connector
4

3. TECHNICAL BRIEF
3.2 RF Part
The RF parts consist of a transmitter part, a receiver part, a frequency synthesizer part, a
voltage supply part, and a VCTCXO part. The Aero transceiver is one chip solution which
supports dual and triple-band GSM/GPRS wireless communications. This device
integrated a receiver based on a low IF(100KHz) architecture and a transmitter based on
a modulation loop architecture which contains a complete dual band transceiver with built
in VCOs. The transceiver employed a 3 wire serial interface to allow an external system
controller to write the control registers for dividers, receive path gain, power down setting,
and other controls.
Figure 3-2 Receiver Block Diagram
Figure 3-3 Frequency Synthesizer Block Diagram
Figure3-4 Transmitter Block Diagram
5

3. TECHNICAL BRIEF
3.3 BaseBand Transmit Section
i. The AD6537B transmit section is designed to support GMSK for both single slot and
multislot applications.
ii. The AD6537B transmit section consists of a digital GMSK modulator, a matched pair of
10-bit DACs and a matched pair of reconstruction filter.
Figure 3-5 AD6537B BASEBAND TRANSMIT SECTION
3.4 BaseBand Receive Section
i. This section consists of two identical ADC channels that process baseband in-phase(I)
and quadrature(Q) signals.
ii. Each channel consists a coarse switched capacitor Anti-alias filter, followed by a low
pass digital filter.
Figure 3-6 AD6537B BASEBAND RECEIVER SECTION
6

4. TROUBLE SHOOTING
4. LG-C3600 TROUBLE SHOOTING
4.1 RF Components
Figure 4-1 RF Components
Reference Description Reference Description
SW500 Mobile S/W U501 PAM
FL401 EGSM SAW Filter FL500 ANT S/W
FL402 DCS SAW Filter U503 LDO
U502 RF Main Chipset
X500 XCTCXO
ANT500
ANT501 ANT Feedback Point
Table 4-1
7

4. TROUBLE SHOOTING
4.2 RX Trouble
START
HP8922:Test M ode
62CH ,7 Level Setting(TCH0
62CH ,-6 0 d B m S ettin g (BCCH)
1 C heck A N T
Feedback Pints
2 Check Regulator
Circuit
3 CheckVCTCX O
Circuit
4 C heck A N T SW
& M o bile S W 5 Check SA W
F ilter C ircu it
6 C heck R eceiving
IQ
Redow nload SW ,Cal
4.2.1 Check ANT Feedback Points
See Figure 4-1. Check ANT500 and ANT501 Check Wether theANT Good Contacting
4.2.2 Check Regulator Circuit
Figure 4-2 Regulator Circuit
Regulator Circuit OK see
Next Page
Check VCTCXO
RF 2.8V OK? PIN6 HIGH ?
Replace the
U503
Change the
Board
YES
Check PIN5 Check PIN 1
NO NO
YES
8

4. TROUBLE SHOOTING
U503
MIC5255-2.85BM5
5
4 3
1
2
OUT
BYP EN
IN
GND
RF 2.85V
RF_LDO
C535
22n
VBAT
C529
4.7n
(1608)
C536
4.7u
CLKON
AFC
4.2.3 Check VCTCXO Circuit
Figure 4-3 VCTCXO Circuit
13Mhz Right?
2.75v Right?
Check U101
VCTCXO Circuit
no problem, check
below, or software
Replace X501
Y
Y
N
N
Chec Pin3
Figure 4-3
Check Pin 4
Figure 4-3
C539
2.2u
C528
100p
X500
26MHz
4
3
2
1
VCC
OUT
GND
VCONT
2V75_VVCXO
R515 10K
C540
0.1u
R510
100
9