GSM Phone REPAIR MANUAL MODEL : LG-600 Series

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 4850515267788386

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.

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

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.

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

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

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

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

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 -

3. ASSEMBLY INSTRUCTION 3.1 Assembly / Disassembly

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

3. ASSEMBLY INSTRUCTION 3.3 Assembly / Disassembly of Folder

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

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

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.

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]

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[1-9-1-1], Keytone[1-9-1-2], Echo Control[1-9-1-3] • Earmic [1-9-2] : Voice[1-9-2-1], Keytone[1-9-2-2], Echo Control[1-9-2-3] • Loudspeaker [1-9-3] : Voice[1-9-3-1], Keytone[1-9-3-2], Echo Control[1-9-3-3] • Handsfree [1-9-4] : Voice[1-9-4-1], Keytone[1-9-4-2], Echo Control[1-9-4-3] • Default value [1-9-5] I. Deep Sleep Test [1-10]

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.

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

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

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

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

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

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

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

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.

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

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

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.

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

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

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

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

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.

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.

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

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 D900-909 2

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.

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

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

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

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

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

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

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

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

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

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

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 : 1805.2~1879.8MHz 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

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 : 1805.2~1879.8MHz 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

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 1. 4.2V Pin 5. 2.8V U212 Check!! Pin 4. 2.7V Pin 3. 13MHz 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

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.

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 !!

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

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 !!

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)

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 5. 2.7 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

Rx Flow Chart & Solution Appendix. Rx Flow Chart & Solution Block 4 Test) U203 (RF Main IC) Check!! GSM : CH40, -60dbm DCS : CH700, -60dbm Pin 4 6. (1) Pin 5. (4) Pin 38, 39. (2) Pin 43,449. (3)

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)

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)

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.)

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

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 !

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

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 !

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 !

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)

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

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

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 !!

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

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!!

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

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!

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

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 !

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 !

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

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!

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

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

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 !

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

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

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 !

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

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

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

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