1. GSM Phone
REPAIR MANUAL
MODEL : LG-600 Series

2. Table of Contents 1. INTRODUCTION .…………………………………
1.1 Purpose .…………………………………..…...
1.2 Abbreviations ………………………………...
2. TEST SETUP ………………………………..…....
2.1 Normal Setup …..……………………..…....
2.2 Standard Setup .………..……………..…....
3. ASSEMBLY INSTRUCTION ……………………
3.1 Assembly / Diassembly ……………………
3.2 Assembly / Diassembly of Front Cover
Componet …………………………………..
4. DOWNLOAD .……………………………………
4.1 Download Setup ……..…………………………
4.2 Download ……………………….……………… 3 4 6 7 11 12 14 15
5. ENGINEERING MODE ………………
5.1 BB Test ………………………………
5.2 Trace Test …………………………
5.3 S/W Version …………………………
5.4 SIM Lock ……………………………
5.5 Call Timer ……………………………
5.6 Fact. Reset …………………………
6. TROUBLE SHOOTING ………………
6.1 Power Supply…………………………
6.2 Voice ………………………………...
6.3 Display ………………………………
6.4 Rx and Tx .……………………………
6.5 The Other Function …………………
Appendix
A.1 RF Component …………………….
A.2 Receiver RF Block Diagram .…….
A.3 Transmitter RF Block Diagram ….
A.4 Rx Flow Chart & Solution ………….
A.5 Tx Flow Chart & Solution ………….
A.6 MIC Flow Chart & Solution ……….
A.7 Receive Flow Chart & Solution ….
A.8 LCD Flow Chart & Solution ………. 16
171919 19 20
202834 41 46 48

3. 1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, description and download the features of the LG-600 series, specially this book has the chip aim of our repair men to improve their ability.
Applicability
This trouble shooting is only applicable to professional engineer for repairing mobile phone.
Maintenance Limitations
Maintenance limitations on the LG-600 series must be performed only by the LGE 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.

4. 1. INTRODUCTION 1.2 Abbreviations IF Intermediate Frequency
LCD Liquid Crystal Display
PCB Printed Circuit Board
PSTN Public Switched Telephone Network
RF Radio Frequency
RTC Real Time Clock
SIM Subscriber Identity Module
SRAM Static Random Access Memory
TA Travel Adapter
TDD Time Division Duplex
TDMA Time Division Multiple Access
WAP Wireless Application Protocol
IPUI International Portable User Identity
BB Baseband
LDO Low Drop Output
LED Light Emitting Diode
CC-CV Constant Current – Constant Voltage
CLA Cigar Lighter Adapter
DAC Digital to Analog Converter
DCS Digital Communication System
DSP Digital Signal Processing
EL Electroluminescence
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GPRS General Packet Radio Service
GSM Global System for Mobile Communications
UART Universal Asynchronous Receiver/Transmitter

5. 1. INTRODUCTION
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following information is ESD handling:
l  Service personnel should ground themselves by using a wrist strap when exchange system boards.
l  When repairs are made to a system board, they should spread the floor with anti-static mat which is also grounded.
l  Use a suitable, grounded soldering iron.
l  Keep sensitive parts in these protective packages until these are used.

6. 2. TEST SETUP 2.1 Normal Setup COM1 I/O Connector COMPUTER LG-600
RS-232 CABLE
COM1
I/O Connector

7. 2. TEST SETUP 2.2 Standard Setup COM1 GPIB RF IN/OUT -S - + +S
COMPUTER
MON
UART
PHONE
POWER
DIP S/W
PIF(LG-600 JIG)
POWER SUPPLY
GSM TESTSET(8960)
LG-600
MOBILE RF CABLE
POWER CABLE
RS-232 CABLE
I/O CON. CABLE
SPECTRUM ANALYZER
HIGH FREQUENCY PROBE
OSCILLOSCOPE
PROBE
GPIB CABLE
+ -
-S S
GPIB
COM1
RF IN/OUT
I/O Connector

8. 2. TEST SETUP A. Computer B. GSM TEST_SET(8960) C. Power Supply
1. Put GPIB card to the extended slot of personal computer.
If you have a notebook PC, you need PCMCIA card for GPIB.
2. Connect the RS-232 cable between COM port of your PC and MON port or
UART port of PIF.
MON Port : Download, CAL Test (????)
UART : Auto Test or Handsfree_Set (????)
B. GSM TEST_SET(8960)
1. Connect GPIB cables (from Computer and Power Supply) to the rear panel
of 8960.
2. Connect mobile RF cable to RF In/Out port at the front panel of 8960.
C. Power Supply
1. Setup : Voltage 4.0V, max Current 3A.
2. Connect GPIB cable at the rear panel.
3. Connect power cable

9. 2. TEST SETUP D. PIF(JIG for LG 600)
1. Connect I/O connector cable for 600 to PIF phone port.
2. Connect the power cable ro PS port of PIF.
3. Connect the RS-232 cable ro PIF MON or UART.
PIF DIP Switch ON
OFF DC PS
REMOTE
H/F
DIP Switch
*H/F=Hands Free
*PS=Power Supply

10. 2. TEST SETUP D. PIF(JIG for LG 600) JTAG2 JTAG1 AUDIO MON Status MON
PHONE
UART
Status
Power
UART TA
DC IN
12V
+ PS -

11. 3. ASSEMBLY INSTRUCTION
3.1 Assembly / Disassembly

12. 3. ASSEMBLY INSTRUCTION
3.2 Assembly / Disassembly of Front Cover Components

13. 3. ASSEMBLY INSTRUCTION
3.3 Assembly / Disassembly of Folder

14. 4. DOWNLOAD 4.1 Download Setup RS-232 CABLE COM1 I/O Connector
COMPUTER
LG-600
RS-232 CABLE
COM1
I/O Connector

15. 4. DOWNLOAD 4.2 Download Caution !!! Remove Battery
Choose Correct Serial Port
Choose “Target/Connect”
Press “PWRON”
of LG-600
Download Completed
Caution !!!
Remove Battery
Erase all
Erase and Program Appli+Boot
Downloading Software

16. Enter : 2945#* 5. ENGINEERING MODE
This mode is used to certify that which part is needed to repair so simply.
This part is consist of BB test, RF test, MF test, SW version and so on.
Enter : 2945#*
About Engineering Mode
Engineering mode is designed to allow a service man/engineer to view and test the basic funtions provided by a hanset.
Access Codes
The key sequence for switching the engineering mode on is 2945#* Pressing END will switch back to non-engineering mode operation.
Key Operation
Use Up and Down key to select a menu and press ‘select’ key to progress the test. Press ‘back’ key will switch back to the original test menu.

17. 5. ENGINEERING MODE 5.1 Baseband Test [MENU 1] A. LED Test [1-2]
This menu is to test the indicator LED on top left hand corner of a handset and backlight LED in the LCD module.
• Auto Test [1-2-1]
• Indicator On [1-2-2] : Green light turns on and menu is changed to “Indicator Off”.
• Back Light On [1-2-3] : Back Light turns on and menu is changed to “Indicator Off”.
• Back Light Degree [1-2-4] : This controls brightness of Backlight. When entering into
the menu, the present backlight-value in the phone is displayed. Use Left/Right key to
adjust the level of brightness. The value of the brightness set at last will be saved.
B. LCD Test [1-3]
This menu is to test the LCD module.
• Auto Test [1-3-1] • Font [1-3-2]
• Icons [1-3-3] • Animation [1-3-4]
• LCD Parameters [1-3-5] • Reset Period [1-3-6]

18. 5. ENGINEERING MODE C. Keypad Test [1-4] D. Melody Test [1-5]
• Auto Test [1-5-1]
• Melody Pattern [1-5-2]
• Melody Volume [1-5-3]
E. Vibrator [1-6]
F. Battery Test [1-7]
G. Serial Port Test [1-8]
H. Audio Gain Test [1-9]
• Receiver [1-9-1] : Voice[ ], Keytone[ ], Echo Control[ ]
• Earmic [1-9-2] : Voice[ ], Keytone[ ], Echo Control[ ]
• Loudspeaker [1-9-3] : Voice[ ], Keytone[ ], Echo Control[ ]
• Handsfree [1-9-4] : Voice[ ], Keytone[ ], Echo Control[ ]
• Default value [1-9-5]
I. Deep Sleep Test [1-10]

19. 5. ENGINEERING MODE 5.2 Trace Test [MENU 2]
S/W Version [MENU 3] : This displays software version stored in the phone.
5.3 Eng Mode [MENU 4]
5.4 SIM Lock [MENU 5]
5.5 Call Timer [MENU 6]
A. All Calls [6-1] : This displays total conversation time. User cannot reset this value.
B. Reset settings [6-2] : This resets total conversation time to this, [00:00:00].
5.6 Fact. Reset [MENU 7]
This Factory Reset menu is to format data block in the flash memory and this procedure set up the default value in data block.
Attention
Fact. Reset (i.e.Factory Reset) should be only used during the Manufacturing process.
Servicemen should NOT progress this menu, otherwise some of valuable data such
as Setting value, RF Calibration data, etc. cannot be restored again.

20. Failure : Power-ON button is not working.
6. TROUBLE SHOOTING
Battery
6.1 Power On Trouble
Failure : Power-ON button is not working.
Solution :
- Check the voltage level
of battery.
- If voltage level < 3.32 v,
Charge the battery.
- If voltage level > 3.32 v,
Go on to the next page.
TOP

21. Failure : Power-ON button is not working.
6. TROUBLE SHOOTING
Battery
Failure : Power-ON button is not working.
Solution :
- Check the voltage level
of TP515.
- If voltage level < 3.32 v,
U501 is not working.
- If voltage level > 3.32 v,
Go on to the next page.
1) TP515 : ON_OFF
U501
U500

22. Failure : Power-ON button is not working.
6. TROUBLE SHOOTING
Voltage Regulator
Failure : Power-ON button is not working.
Solution :
If Pin 1 < 4.2 v,
Replace battery.
If Pin 5 < 2.8 v,
Replace U207.
Go on to the next page.
U207 5 1

23. Failure : Power-ON button is not working.
6. TROUBLE SHOOTING
Back battery, Switch
Failure : Power-ON button is not working.
Solution :
If Pin 2 < 2 v,
Replace Backup Battery.
If Pin 5 < 3.32 v,
Check Placement U903.
If Pin 1 < 3.32 v,
Replace U903. 5
U903 2 1

24. Failure : Charging is not working.
6. TROUBLE SHOOTING
FET
Failure : Charging is not working.
Solution :
Check the voltage level
of Q600. (Pin 4 ,5)
If not (0.65 < voltage < 3.32 v)
Replace Q600
Go on to the next page. 4 5

25. Failure : Charging is not working.
6. TROUBLE SHOOTING
Schottkey Diode
Failure : Charging is not working.
Solution :
Check the voltage level
of D601.
If voltage < 0.3 v
Replace D601
Go on to the next page.
voltage

26. Failure : Charging is not working.
6. TROUBLE SHOOTING
Resistor
Failure : Charging is not working.
Solution :
Check the voltage level
of R609.
If voltage < 0.12 v
Replace R609
Go on to the next page.
voltage

27. Failure : Charging is not working.
6. TROUBLE SHOOTING
Connector
Failure : Charging is not working.
Solution :
CN300 Cold soldering
Please re-solder again.
CN300 broken, please
Replace connector CN300.

28. Failure : Microphone voice is not working.
6. TROUBLE SHOOTING
Resistor, Coil
6.2 Voice Trouble
Failure : Microphone voice is not working.
Solution :
Check soldering
for R614, R616 .
Check F610 voltage level .
If voltage level < 2.5 v,
Please re-solder
or Replace .
Go on to the next page.
F610
R614, R616

29. Failure : Microphone voice is not working.
6. TROUBLE SHOOTING
Switch
Failure : Microphone voice is not working.
Solution :
After putting audio signal
in MIC
Any signal Detected?
U900 Pin 5,6 U901 Pin 5,6
If no signal?
Replace U900, U901.
U901
U900 5 6 5 6
5 6
U901
U900

30. Failure : Receiver is not working.
6. TROUBLE SHOOTING
Coil
Failure : Receiver is not working.
Solution :
Any signal Detected?
F605, F606
If no signal?
Replace F605, 605.
Go on to the next page.

31. Failure : Receiver is not working.
6. TROUBLE SHOOTING
Connector
Failure : Receiver is not working.
Solution :
Check CN301, CON900
Cold soldering?
please re-solder again
CN301, CON900 broken?
replace connector
CN301, CON900
Check Receiver
solering or replace

32. Failure : Hand free is not working.
6. TROUBLE SHOOTING
Connector
Failure : Hand free is not working.
Solution :
CN300 Cold soldering.
Please re-solder again.
CN300 broken, please
replace connector
CN300.
CN300

33. Failure : Melody is not working.
6. TROUBLE SHOOTING
Transistor
Failure : Melody is not working.
Solution :
Check Q602 Collector.
If voltage is not
changed in Multi Meter
(ex: +150mv, -170mv
+140mv, -130mv …)
Replace Q602.
Collector

34. Failure : LCD is not working.
6. TROUBLE SHOOTING
LCD Module
6.3 Display Trouble
Failure : LCD is not working.
Solution :
Check Connector soldering
CON902, FPC connector
Replace whole LCD module
Soldering the LCD module with care.
Go on to the next page.
Sub-LCD
Bottom
Receiver
Main-LCD
Vibrator
Top

35. Failure : LCD is not working.
6. TROUBLE SHOOTING
Voltage Regulator
Failure : LCD is not working.
Solution :
Check U305 Pin 5 voltage
level
If voltage level < 3 v ?
Replace U305.

36. Failure : Key back light is not working.
6. TROUBLE SHOOTING
Resistor
Failure : Key back light is not working.
Solution :
R601 Cold soldering.
Please re-solder again.
Go on to the next page.

37. Failure : Key back light is not working.
6. TROUBLE SHOOTING
Transistor
Failure : Key back light is not working.
Solution :
Check U600 Pin 2 voltage
level.
If voltage level < 3 v ?
Replace U600.
Go on to the next page. 2

38. Failure : Key back light is not working.
6. TROUBLE SHOOTING
LED
Failure : Key back light is not working.
Solution :
Check LED Pin 1 voltage
level ( = battery voltage)
if not, replace battery.
Replace D701~D708, one
by one. 1 D 2

39. Failure : LCD EL back light is not working.
6. TROUBLE SHOOTING
Resistor
Failure : LCD EL back light is not working.
Solution :
R906 Cold soldering.
Please re-solder again.
Go on to the next page.

40. Failure : LCD EL back light is not working.
6. TROUBLE SHOOTING
Connector
Failure : LCD EL back light is not working.
Solution :
Check CON900,CON902
cold soldering.
Please re-solder again.
And then, It’s not
working. Replace whole
LCD module
CON900
CON902

41. Failure : Rx is not working.
6. TROUBLE SHOOTING
Voltage Regulator
6.4 Rx and Tx
Failure : Rx is not working.
Solution :
Check U207 Pin 5 voltage
level
If voltage level < 2.8 v ?
Replace U207.
Go on to the next page. 5

42. Failure : Rx is not working.
6. TROUBLE SHOOTING
Switch
Failure : Rx is not working.
Solution :
Check U903 Pin 1 voltage
level
If voltage level < 2 v ?
Replace U903.
Go on to the next page. 1

43. Failure : Rx is not working.
6. TROUBLE SHOOTING
VCTCXO
Failure : Rx is not working.
Solution :
Check U212 Pin 3
(13Mhz Output)
If voltage is not
changed in Multi Meter
(ex: +100mv, 0mv
+100mv, 0mv …)
Replace U212, if the
soldering checks good.
Go on to the next page. 3

44. Failure : Rx is not working.
6. TROUBLE SHOOTING
Transistor
Failure : Rx is not working.
Solution :
Check Q200 Pin 1
(13Mhz Output)
If voltage is not
changed in Multi Meter
(ex: +100mv, 0mv
+100mv, 0mv …)
Replace Q200, if the
soldering checks good.
Go on to the next page.
Q200 1 1

45. Failure : Tx is not working.
6. TROUBLE SHOOTING
Voltage Regulator
Failure : Tx is not working.
Solution :
Check U205 Pin 5 voltage
level
If voltage level < 2.8 v ?
Replace U205.
Go on to the next page. 5

46. Failure : Vibrator is not working.
6. TROUBLE SHOOTING
Resistor
6.5 The Other Function
Failure : Vibrator is not working.
Solution :
Check the voltage level
of R610.
If voltage < 3.32 v
Replace R610
Go on to the next page.
R610
voltage

47. Failure : Vibrator is not working.
6. TROUBLE SHOOTING
Transistor
Failure : Vibrator is not working.
Solution :
Check the collector voltage level of Q601.
If voltage < 3 v
Replace Q601
And then, It’s not working. Replace Vibrator
Q601
Collector

48. RF components Appendix. U203 U208 U200 U212 U201 U204 FL1 U202
U200 : IF SAW Filter
U201 : DCS RF SAW 2nd Filter
U202 : LNA
U203 : RF Main Chip
U204 : GSM RF SAW 2nd Filter
U208 : TX VCO
U212 : VCTCXO
FL1 : RF Dual 1st Filter

49. RF components Appendix. U100 U103 U210 U209 U107 U102 U104 U101
U100 : Power AMP Module
U101 : APC IC
U102 : GSM Coupler
U103 : ANT Switch
U104 : DCS Coupler
U107 : RF Connector
U209 : Balun
U210 : LO1 VCO

50. Receiver RF Block Diagram
Appendix.
Receiver RF Block Diagram
/1440
PFD
/13 /4
/NA /5 t LF
1440MHz
SAW Filter
(B4837)
360MHz IR
IRX QR
QRX
VCTCXO
(KT16-KEU28L)
13MHz
AFC
FSYS
IFI
IFIX
RX1
RX1X
RX2
RX2X MO
MOX
LO1
LO1X
OSW
PLL_ON
MAX2652
LNAG
LNAON
BSW
"0" GSM
"1" DCS
PA_ON
RXIP
RXIN
RXQP
RXQN
1285~1361MHz
1445~1520MHz
LO VCO
(MQE956)
FAR-G6CH
B4115
SHS-L090DE
EGSM : 925.2~959.8MHz
DCS : ~1879.8MHz
SAFC1842.5
-15dBm
(11)
-60dBm
(8)
-58dBm
(7)
-72dBm
(6)
-70dBm
(5)
(1)
(2)
-55dBm
(3)
(4)
(9)
-65dBm
(10)
GSM : CH40, -60dBm
DCS : CH700, -60dBm

51. Transmitter RF Block Diagram
Appendix.
Transmitter RF Block Diagram
/1440
PFD
/13 /4
/NA /5 t LF
1440MHz
SAW Filter
(B4837)
360MHz IR
IRX QR
QRX
VCTCXO
(KT16-KEU28L)
13MHz
AFC
FSYS
IFI
IFIX
RX1
RX1X
RX2
RX2X MO
MOX
LO1
LO1X
OSW
PLL_ON
MAX2652
LNAG
LNAON
BSW
"0" GSM
"1" DCS
PA_ON
RXIP
RXIN
RXQP
RXQN
1285~1361MHz
1445~1520MHz
LO VCO
(MQE956)
FAR-G6CH
B4115
SHS-L090DE
EGSM : 925.2~959.8MHz
DCS : ~1879.8MHz
SAFC1842.5
-15dBm
(11)
-60dBm
(8)
-58dBm
(7)
-72dBm
(6)
-70dBm
(5)
(1)
(2)
-55dBm
(3)
(4)
(9)
-65dBm
(10)
GSM : CH62, DAC value 600
DCS : CH700, DAC value 700

52. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode
START
PIF Power On
RF2V8
O.K?
RF Main Chip O.K?
Ref. Clock 13MHz O.K?
Yes
U207 Check!!
Pin V
Pin V
U212 Check!!
Pin V
Pin MHz
U203, U204,U201 Check!! No
Block 2
Block 3
Block 4
Block 6
Antenna Part
RX O.K?
Goto Block 2 Test.
Goto Block 3 Test
Goto Block 4 Test
U107 & U103 Check!!
RX Path Working !
RF LNA & Filter O.K?
FL1, U202 Check!!
Goto Block 5 Test
Goto Block 6 Test

53. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 2 Test-1) U207 (RF 2.85V LDO) Check!!
Pin 3.
Pin 5.
Pin 1.

54. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 2 Test-1) U207 (RF 2.85V LDO) Check!!
2-A) Check Pin 1. Using Oscilloscope
Yes
Voltage 4.2V ? No
Check Placement of U207
VBAT Line Check Short? (Using Multi Meter)
If it has not problem
2-B) Check Pin 3. Using Oscilloscope
Yes
Pin 3. High ? No
Check U903
Goto Next Page
Replace U207
2-B Test!!
2-C) Check Pin 5. Using Oscilloscope
Yes
RF2V8 O.K?
If it has not problem No
Check Placement of U207
Check RF2.85V Line. Short?(Using Multi Meter)
U207 Working
Goto Block 3 !!

55. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 2 Test-2) U903 Check!!
Pin 5.
Pin 1.

56. Replace Backup Battery
Appendix.
Rx Flow Chart & Solution
2-A) Check Pin 2. Using Oscilloscope
Replace Backup Battery
Yes
Voltatge > 2 V ? No
2-B) Check Pin 5. Using Oscilloscope
Yes
Pin 5. High ? No
Check Placement of U903
EN Line Check Short? (Using Multi Meter)
If it has not problem
2-C) Check Pin 1. Using Oscilloscope
Yes
Pin 1. High ? No
Replace U903
Replace U500
2-B Test!!
Goto Block 2 Test 1 !!

57. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 3 Test) U212 (13MHz Oscillator) Check!!
Pin 3. Output
Pin 4. VCC
Pin 1.CTL
(15번 핀)

58. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
3-A) Check Placement of U212
3-B) Check Pin 4. Using Oscilloscope.
Yes
Voltage 2.7V ? No
U211 Pin V?
Yes
Check Short
3-B) Test!! No
Replace U211
3-C) Check Pin 3. Using Oscilloscope.
13MHz Output ? No
Pin 1. High ? No
AFC Line Short?
Yes
Yes
Yes
Replace U501 No
13MHz Line Short? No
Yes
Check Short
3-C) Test!!
Q200 Working?
Yes
Replace U212
3-C) Test!! No
Replace Q200
3-C) Test!!
U212 Working
Goto Block 4

59. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 4 Test) U203 (RF Main IC) Check!!
GSM : CH40, -60dbm
DCS : CH700, -60dbm
Pin (1)
Pin 5. (4)
Pin 38, 39. (2)
Pin 43,449. (3)

60. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
/1440
PFD
/13 /4
/NA /5 t LF
1440MHz
SAW Filter
(B4837)
360MHz IR
IRX QR
QRX
VCTCXO
(KT16-KEU28L)
13MHz
AFC
FSYS
IFI
IFIX
RX1
RX1X
RX2
RX2X MO
MOX
LO1
LO1X
OSW
PLL_ON
LNAG
LNAON
BSW
RXIP
RXIN
RXQP
RXQN
1285~1361MHz
1445~1520MHz
LO VCO
(MQE956)
B4115
SAFC1842.5
-60dBm
(4)
-58dBm
(1)
(2)
-65dBm
(3)

61. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 4 Test) U203 (RF Main IC) Check!!
GSM : CH40, -60dbm
DCS : CH700, -60dbm
/1440
PFD
/13 /4
/NA /5 t LF
1440MHz
SAW Filter
(B4837)
360MHz IR
IRX QR
QRX
VCTCXO
(KT16-KEU28L)
13MHz
AFC
FSYS
IFI
IFIX
RX1
RX1X
RX2
RX2X MO
MOX
LO1
LO1X
OSW
PLL_ON
LNAG
LNAON
BSW
RXIP
RXIN
RXQP
RXQN
1285~1361MHz
1445~1520MHz
LO VCO
(MQE956)
B4115
SAFC1842.5
-60dBm
(4)
-58dBm
(1)
(2)
-65dBm
(3)

62. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
4-A) Check Placement of U203
4-B) Check U204 Pin 4, 6, Using Spectrum Analyzer
GSM SAW Filter
Output ~ -59dbm ?
Yes No
5-A Test!!
4-C) Check U201 Pin 5, Using Spectrum Analyzer
DCS SAW Filter
Output ~ -60dbm ?
Yes No
5-A Test!!
4-D) Check Pin 38, 39, Using Spectrum Analyzer
RF Mixer
Output ~ -60dbm ?
Yes No
Replace U203
4-C) Test
4-E) Check Pin 44, 43, Using Spectrum Analyzer
IF SAW Filter
Output ~ -65dbm ?
Replace U200
4-D) Test
Yes No
U203 Working
(RF RX path OK.)

63. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
Block 5 Test) U202(LNA), FL1(Dual Band Pass Filter) Check!!
GSM : CH40, -60dbm
DCS : CH700, -60dbm
U202
Pin 7
Pin 9
Pin 5
FL1
Pin 7

64. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
5-A) Check Placement of U202, FL1
5-B) Check FL1 Pin 5,7 Using Spectrum Analyzer
Check Soldering
Replace FL1
5-B) Test!!
Yes
RF Output~ -72dbm ? No
5-C) Check U202 Pin 7,9, Using Spectrum Analyzer.
Replace U202
5-C) Test!!
RF Output
Pin 9 ~ -55dbm ?
Pin 7 ~ 58dbm ?
Yes No
Goto Block 6 !

65. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
GSM : CH40, -60dbm
DCS : CH700, -60dbm
Block 6 Test) U103 (RX/TX Switch) Check!!
Pin 9
Pin 16

66. Rx Flow Chart & Solution
Appendix.
Rx Flow Chart & Solution
6-A) Check Placement of U103
6-B) Check U107(Mobile Switch) Pin 1,2 (S/W Signal Line) Using Spectrum Analyzer
Check Soldering
Replace U107
6-B) Test!!
Yes No
RF Output ?
6-C) Check U103 Pin 9, 16, Using Spectrum Analyzer.
Replace U103
6-C) Test!!
RF Output ~ -70dbm ?
Yes No
RX Path Working !

67. PIF Power On, Test after Call 112
Appendix.
Tx Flow Chart & Solution
Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode
START
PIF Power On, Test after Call 112
TXIQ O.K.?
TX VCO O.K.?
PAM O.K.?
Yes
U203 Check!!
U208 Check!! No
Block 7
Block 8
Block 11
Goto Block 7 Test
Goto Block 8 Test
Goto Block 9 Test
U100 Check!!
Dictional Coupler
O.K.?
Goto Block 10 Test
U102, 104 Check!!
Antena Part TX O.K.?
Goto Block 11 Test
U103 Check!!
Block 9
Block 10
TX Path Working !

68. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
Block 7 Test) U203 (TXIQ) Check!!
GSM : CH62, DAC Value 560
DCS : CH700, DAC Value 560
Pin 9, 10.(TxI)
Pin 11, 12.(TxQ)

69. U501 (Nausica) is Not Working
Appendix.
Tx Flow Chart & Solution
7-A) Check Pin 9(TXIP) & 10번(TXIN), Pin 11(TXQP) & Pin 17(TXQN) Using Oscilloscope
4 Pin ALL
High Output ? No
Just Pin 1,2 or 3
High Output ?
Yes
TXIQ Line Short ?
Yes
Yes No No
Goto Block 8 !!
U501 (Nausica) is Not Working
Replace U501
Check Short
Block 7) Test!!
Reference TXIQ Signal

70. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
GSM : CH62, DAC Value 560
DCS : CH700, DAC Value 560
Block 8 Test) U208 (TX VCO) Check!!
GSM_OUT
DCS_OUT

71. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
8-A) Check Placement of U208
GSM TX BAND
DCS TX BAND
9-B) Check U208 Pin 6, Using Oscilloscope
9-B) Check U208 Pin 10, Using Oscilloscope
Goto Block 2
Check U205
Yes
2.85V ? No No
2.85V ?
Yes
U207= U205( Same Function)
9-C) Check U208 Pin 7
9-C) Check U208 Pin 7.
Yes
Low ? No
U203 Is Not Working
Replace No
High ?
Yes
9-D) Check U208 Pin 6, Using Spectrum Analyzer
9-D) Check U208 Pin 10, Using Spectrum Analyzer
Check Resistor
& Capacitor
OK?
Check Resistor
& Capacitor
OK?
Yes
TX Output ? No No No No
TX Output ?
Yes
Yes
Yes
Replace U208
9-D) Test!!
Replace U208
9-D) Test!!
Replace
9-D) Test!!
Goto Block 10 !!

72. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
Block 9 Test) U100 (PAM) Check!!
GSM : CH62, DAC Value 560
DCS : CH700, DAC Value 560

73. Check Short & Resistor Value
Appendix.
Tx Flow Chart & Solution
9-A) Check Placement of U100
GSM TX BAND
DCS TX BAND
9-B) Check Pin 4,5, Using Oscilloscope
9-B) Check Pin 4,5, Using Oscilloscope
Yes
4.2V ? No
Check Main Battery No
4.2V ?
Yes
9-C) Check Pin 6, Using Spectrum Analyzer
9-C) Check Pin 6, Using Spectrum Analyzer.
TX Output ~20dbm?
Yes No
Attenuator Check!!
Check Short & Resistor Value
TX Output ~18dbm? No
Yes
9-B) Test!!
Each Power
Level OK. ?
Yes
Yes
Each Power
Level OK. ?
Block 10 !! No No
Block 9!!

74. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
Block 10 Test) U102, 104 (Coupler) Check!!
GSM : CH62, DAC Value 560
DCS : CH700, DAC Value 560

75. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
10-A) Check Placement of U102, 104
GSM TX BAND
DCS TX BAND
10-B) Check U102 Pin 3, Using Spectrum Analyzer
10-B) Check U104 Pin 3, Using Spectrum Analyzer
RF Output ~ 20dbm?
RF Output ~ 18dbm?
Yes No
C107 Valid?
(Short & Open)
C123 Valid?
(Short & Open) No
Yes No
Yes
Yes No
10-B) Test!!
Replace U102, 104
10-B) Test!!
Goto Block 11!

76. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
GSM : CH62, DAC Value 560
DCS : CH700, DAC Value 560
Block 11 Test) U103 (RX/TX Switch) Check!!
Pin 2

77. Tx Flow Chart & Solution
Appendix.
Tx Flow Chart & Solution
11-A) Check Placement of U103
11-B) Check U107(Mobile Switch) Pin 1,2 (S/W Signal Line) Using Spectrum Analyzer
Check Soldering
Replace U107
11-B) Test!!
Yes No
RF Output ?
11-C) Check U103 Pin 2, Using Spectrum Analyzer.
Replace U103
11-C) Test!!
RF Output ~ 15dbm ?
Yes No
TX Path Working !

78. PIF Power On, Test after Call 112
Appendix.
MIC Flow Chart & Solution
Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode
START
PIF Power On, Test after Call 112
Block 12
MIC_BIAS O.K.? No
Goto Block 12 Test
F610 Check!!
Yes
Block 13
Audio Signal Level O.K.? No
Goto Block 13 Test
U900, U901 Check!!
Yes
Check MIC Soldering
MIC1 Check!!
Yes
MIC Working !

79. MIC Flow Chart & Solution
Appendix.
MIC Flow Chart & Solution
Block 12 Test) MIC1 (MIC) Check!!

80. MIC Flow Chart & Solution
Appendix.
MIC Flow Chart & Solution
12-A) Check Placement of MIC1
12-B) Check F610 Using Osciolloscope
Check Soldering
F610, R614 , R616
12-B) Test!!
Yes No
2.5 V ?
Goto Block 13!

81. MIC Flow Chart & Solution
Appendix.
MIC Flow Chart & Solution
Block 13 Test) MIC1 (MIC) Check!!

82. A few hundreds of mV Signal
Appendix.
MIC Flow Chart & Solution
13-A) Check Audio Signal Level U900 Pin 5,6 U901 Pin 5,6 After putting audio signal in MIC
A few hundreds of mV Signal
are measured ?
Check Soldering
Replace U900, U901
13-1) Test!!
Yes No
MIC Working !
Reference MIC Signal

83. PIF Power On, Test after Call 112
Appendix.
RECEIVE Flow Chart & Solution
Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode
START
PIF Power On, Test after Call 112
Block 14
Detect Signal Level.? No
Goto Block 14 Test
F605, F606 Check!!
Yes
Block 15
Check Soldering
CN301, CON900, Receiver Check!!
Yes
RECEIVER Working !

84. RECEIVE Flow Chart & Solution
Appendix.
RECEIVE Flow Chart & Solution
Block 14 Test) F605, F606 Check!!
Receiver

85. RECEIVE Flow Chart & Solution
Appendix.
RECEIVE Flow Chart & Solution
14-A) Check Placement of RECEIVER
14-B) Check F605, F606 Using Osciolloscope
Check Soldering
F605, F606
14-B) Test!!
Yes No
Signal Detect ?
Yes
Goto Block 15!
Replace
U501
Reference RECEIVER Signal

86. PIF Power On, Test after Call 112
Appendix.
LCD Flow Chart & Solution
Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode
START
PIF Power On, Test after Call 112
Contact of LCD module
with LCD connector on
PCB OK.? No
Reassemble LCD module
With LCD connector
Yes
Block 16
LCD Driver
Source Voltage 3V ? No
Goto Block 16 Test
Yes
U305 Pin 5 Check!!
Block 17
Check Soldering No
Goto Block 17 Test
Yes
CON 902 Check!!
LCD Working !

87. LCD Flow Chart & Solution
Appendix.
LCD Flow Chart & Solution
Block 16 Test) U305 Check!!

88. LCD Flow Chart & Solution
Appendix.
LCD Flow Chart & Solution
16-A) Check Placement of U305
16-B) Check U305 Pin 3 Using Osciolloscope
Check LCD_EN
Line Path
16-B) Test!!
Yes No
Pin 3 > 3V ?
Yes
Replace
U500
16-C) Check U305 Pin 5 Using Osciolloscope
Check Soldering
U305
16-C) Test!!
Yes No
Pin 3 > 3V ?
Yes
Goto Block 17!
Replace
U305

89. LCD Flow Chart & Solution
Appendix.
LCD Flow Chart & Solution
Block 17 Test) CON902 Check!!

90. LCD Flow Chart & Solution
Appendix.
LCD Flow Chart & Solution
17-B) Check CON 902 Soldering & Line Path
Replace
LCD Module
Yes
LCD Module is Working ? No
LCD Working !
Reference LCD Signal