LG -600 Series Repair Manual
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LG -600 Series Repair Manual

LG -600 Series Repair Manual

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GSM Phone
REPAIR MANUAL
MODEL : LG-600 Series
GSM Handsets Lab.

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Summary of Contents for LG LG-600 Series

  • Page 1 GSM Phone REPAIR MANUAL MODEL : LG-600 Series GSM Handsets Lab.

  • Page 2: Table Of Contents

    Table of Contents 1. INTRODUCTION .………………………………… 5. ENGINEERING MODE ……………… 1.1 Purpose .…………………………………..…... 5.1 BB Test ……………………………… 1.2 Abbreviations ………………………………... 5.2 Trace Test ………………………… 5.3 S/W Version ………………………… 2. TEST SETUP ………………………………..…..5.4 SIM Lock …………………………… 2.1 Normal Setup …..……………………..…..5.5 Call Timer ……………………………...

  • Page 3: Introduction

    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.

  • Page 4: Abbreviations

    1. INTRODUCTION • 1.2 Abbreviations Intermediate Frequency Baseband Liquid Crystal Display Low Drop Output Printed Circuit Board Light Emitting Diode PSTN Public Switched Telephone Network CC-CV Constant Current – Constant Voltage Radio Frequency Cigar Lighter Adapter Real Time Clock Digital to Analog Converter Subscriber Identity Module Digital Communication System SRAM...
  • Page 5 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.

  • Page 6: Test Setup

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

  • Page 7: Standard Setup

    2. TEST SETUP • 2.2 Standard Setup GPIB CABLE GPIB GSM TESTSET(8960) GPIB CABLE GPIB GPIB COM1 GPIB COMPUTER POWER SUPPLY RF IN/OUT -S  -  +  +S  MOBILE RF CABLE LG-600 RS-232 CABLE I/O Connector  I/O CON. CABLE PIF(LG-600 JIG) DIP S/W UART PHONE POWER POWER CABLE PROBE +  - SPECTRUM ANALYZER OSCILLOSCOPE HIGH FREQUENCY PROBE GSM Handsets Lab.
  • Page 8 2. TEST SETUP A. Computer 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.
  • Page 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...
  • Page 10 2. TEST SETUP D. PIF(JIG for LG 600) JTAG2 JTAG1 AUDIO Status PHONE UART Power UART Status DC IN + PS - GSM Handsets Lab.

  • Page 11: Assembly Instruction

    3. ASSEMBLY INSTRUCTION • 3.1 Assembly / Disassembly GSM Handsets Lab.

  • Page 12: Assembly / Diassembly Of Front Cover Componet

    3. ASSEMBLY INSTRUCTION • 3.2 Assembly / Disassembly of Front Cover Components GSM Handsets Lab.
  • Page 13 3. ASSEMBLY INSTRUCTION • 3.3 Assembly / Disassembly of Folder GSM Handsets Lab.

  • Page 14: Download

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

  • Page 15: Download

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

  • Page 16: Engineering Mode

    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.

  • Page 17: Bb Test

    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”.
  • Page 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] •...

  • Page 19: Trace Test

    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.

  • Page 20: Trouble Shooting

    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.
  • Page 21 6. TROUBLE SHOOTING Battery Failure : Power-ON button is not working. Solution : - Check the voltage level of TP515. - If voltage level < 3.32 v, U500 U501 is not working. - If voltage level > 3.32 v, Go on to the next page. U501 1) TP515 : ON_OFF GSM Handsets Lab.
  • Page 22 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 GSM Handsets Lab.
  • Page 23 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.
  • Page 24 6. TROUBLE SHOOTING Failure : Charging is not working. Solution : - Check the voltage level of Q600. (Pin 4 ,5) - If not (0.65 < voltage < 3.32 v)  4 Replace Q600 Go on to the next page.  5 GSM Handsets Lab.
  • Page 25 6. TROUBLE SHOOTING Schottkey Diode Failure : Charging is not working. Solution : - Check the voltage level of D601.  voltage - If voltage < 0.3 v Replace D601 Go on to the next page. GSM Handsets Lab.
  • Page 26 6. TROUBLE SHOOTING Resistor Failure : Charging is not working. Solution : - Check the voltage level of R609.  voltage - If voltage < 0.12 v Replace R609 Go on to the next page. GSM Handsets Lab.
  • Page 27 6. TROUBLE SHOOTING Connector Failure : Charging is not working. Solution : - CN300 Cold soldering Please re-solder again. - CN300 broken, please Replace connector CN300. GSM Handsets Lab.

  • Page 28: Voice

    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,  F610 Please re-solder or Replace .
  • Page 29 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?  U901  U900 Replace U900, U901.  5  6  5  6  U901...
  • Page 30 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. GSM Handsets Lab.
  • Page 31 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 GSM Handsets Lab.
  • Page 32 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 GSM Handsets Lab.
  • Page 33 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 GSM Handsets Lab.

  • Page 34: Display

    6. TROUBLE SHOOTING LCD Module 6.3 Display Trouble Failure : LCD is not working. Solution : Sub-LCD - Check Connector soldering CON902, FPC connector - Replace whole LCD module - Soldering the LCD module Bottom with care. Go on to the next page. Receiver Main-LCD Vibrator...
  • Page 35 6. TROUBLE SHOOTING Voltage Regulator Failure : LCD is not working. Solution : - Check U305 Pin 5 voltage level - If voltage level < 3 v ? Replace U305. GSM Handsets Lab.
  • Page 36 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. GSM Handsets Lab.
  • Page 37 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 GSM Handsets Lab.
  • Page 38 6. TROUBLE SHOOTING 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.  D900-909 GSM Handsets Lab.
  • Page 39 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. GSM Handsets Lab.
  • Page 40 6. TROUBLE SHOOTING Connector Failure : LCD EL back light is not working. Solution : - Check CON900,CON902 cold soldering. CON900 Please re-solder again. - And then, It’s not working. Replace whole LCD module CON902 GSM Handsets Lab.

  • Page 41: Rx And Tx

    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 GSM Handsets Lab.
  • Page 42 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 GSM Handsets Lab.
  • Page 43 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 …)  3 Replace U212, if the soldering checks good. Go on to the next page.
  • Page 44 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 Q200 soldering checks good. Go on to the next page.
  • Page 45 6. TROUBLE SHOOTING Voltage Regulator Failure : Tx is not working. Solution : - Check U205 Pin 5 voltage level  5 - If voltage level < 2.8 v ? Replace U205. Go on to the next page. GSM Handsets Lab.

  • Page 46: The Other Function

    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 GSM Handsets Lab.
  • Page 47 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 GSM Handsets Lab.

  • Page 48: Appendix

    Appendix. RF components U202 U200 : IF SAW Filter U201 : DCS RF SAW 2nd Filter U204 U202 : LNA U203 : RF Main Chip U204 : GSM RF SAW 2nd Filter U201 U208 : TX VCO U203 U212 : VCTCXO U200 FL1 : RF Dual 1st Filter U208...
  • Page 49 Appendix. RF components U107 U209 U100 : Power AMP Module U101 : APC IC U102 : GSM Coupler U103 : ANT Switch U104 : DCS Coupler U102 U103 U210 U107 : RF Connector U209 : Balun U104 U210 : LO1 VCO U100 U101 GSM Handsets Lab.

  • Page 50: Receiver Rf Block Diagram

    Appendix. Receiver RF Block Diagram -72dBm -55dBm -58dBm -60dBm -65dBm (10) -70dBm MAX2652 B4115 EGSM : 925.2~959.8MHz SAW Filter RXIP (B4837) RX1X RXIN 360MHz SAFC1842.5 IFIX RXQP RX2X RXQN DCS : 1805.2~1879.8MHz FAR-G6CH LNAG LNAON -70dBm /1440 1440MHz "0" GSM "1"...

  • Page 51: Transmitter Rf Block Diagram

    Appendix. Transmitter RF Block Diagram -72dBm -55dBm -58dBm -60dBm -65dBm (10) -70dBm MAX2652 B4115 EGSM : 925.2~959.8MHz SAW Filter RXIP (B4837) RX1X RXIN 360MHz SAFC1842.5 IFIX RXQP RX2X RXQN DCS : 1805.2~1879.8MHz FAR-G6CH LNAG LNAON -70dBm /1440 1440MHz "0" GSM "1"...

  • Page 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 Block 2 RF2V8 Goto Block 2 Test O.K? U207 Check!! Pin  1.  4.2V Pin  5.  2.8V Block 3 Goto Block 3 Test Ref. Clock 13MHz O.K? U212 Check!! Pin 4.  2.7V Pin 3.  13MHz Block 4 RF Main Chip O.K? Goto Block 4 Test   U203, U204,U201 Check!!   Block 4 RF LNA & Filter O.K? Goto Block 5 Test   FL1, U202 Check!!   Block 6 Antenna Part Goto Block 6 Test  RX O.K? U107 & U103 Check!! RX Path Working ! GSM Handsets Lab.
  • Page 53 Appendix. Rx Flow Chart & Solution Block 2 Test-1)  U207 (RF 2.85V LDO) Check!! Pin 3. Pin 1. Pin 5. GSM Handsets Lab.
  • Page 54 Appendix. Rx Flow Chart & Solution Block 2 Test-1)  U207 (RF 2.85V LDO) Check!! 2-A) Check Pin 1. Using Oscilloscope Check Placement of  U207  Voltage 4.2V ?  VBAT Line Check  Short? (Using Multi Meter) If it has not  problem 2-B) Check Pin 3. Using Oscilloscope Check U903  Pin 3. High ?  Replace U207  Goto Next Page 2-B Test!! 2-C) Check Pin 5. Using Oscilloscope RF2V8 O.K?  If it has not  problem Check Placement of  U207 U207 Working Check RF2.85V Line.  Short?(Using Multi Meter) Goto Block 3 !! GSM Handsets Lab.
  • Page 55 Appendix. Rx Flow Chart & Solution Block 2 Test-2)  U903 Check!! Pin 5. Pin 1. GSM Handsets Lab.
  • Page 56 Appendix. Rx Flow Chart & Solution 2-A) Check Pin 2. Using Oscilloscope Replace Backup Battery >  Voltatge   2 V ?  2-B) Check Pin 5. Using Oscilloscope Check Placement of  U903  Pin 5. High ?  EN Line Check  Short? (Using Multi Meter) If it has not  problem 2-C) Check Pin 1. Using Oscilloscope  Pin 1. High ?  Replace U903 Replace U500  2-B Test!! Goto Block 2 Test 1 !! GSM Handsets Lab.
  • Page 57 Appendix. Rx Flow Chart & Solution Block 3 Test)  U212 (13MHz Oscillator) Check!! Pin 3.  Output Pin 4. VCC Pin 1.CTL (15 번 핀 ) GSM Handsets Lab.
  • Page 58 Appendix. Rx Flow Chart & Solution 3-A) Check Placement of  U212  3-B) Check Pin 4. Using Oscilloscope. Check Short   Voltage  2.7V ?   U211 Pin 5.  2.7 V?  3-B) Test!! Replace U211 3-C) Check Pin 3. Using Oscilloscope. 13MHz Output ?  Pin 1. High  ?  AFC Line Short?  Replace U501 13MHz Line Short?   Check  Short  3-C) Test!! Q200 Working?  Replace U212 3-C) Test!! Replace Q200  3-C) Test!! U212 Working Goto Block 4 GSM Handsets Lab.
  • Page 59 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) GSM Handsets Lab.
  • Page 60 Appendix. Rx Flow Chart & Solution -58dBm -60dBm -65dBm B4115 SAW Filter RXIP (B4837) RX1X 360MHz RXIN SAFC1842.5 IFIX RXQP RX2X RXQN LNAG LNAON /1440 1440MHz 13MHz FSYS VCTCXO (KT16-KEU28L)  -60dBm LO1X LO1X 1285~1361MHz 1445~1520MHz LO VCO PLL_ON (MQE956) GSM Handsets Lab.
  • Page 61 Appendix. Rx Flow Chart & Solution Block 4 Test)  U203 (RF Main IC) Check!! GSM : CH40, -60dbm DCS : CH700, -60dbm -58dBm -60dBm -65dBm B4115 SAW Filter RXIP (B4837) RX1X 360MHz RXIN SAFC1842.5 IFIX RXQP RX2X RXQN LNAG LNAON /1440 1440MHz 13MHz FSYS VCTCXO (KT16-KEU28L)  -60dBm LO1X LO1X 1285~1361MHz 1445~1520MHz LO VCO PLL_ON (MQE956) GSM Handsets Lab.
  • Page 62 Appendix. Rx Flow Chart & Solution 4-A) Check Placement of U203 4-B) Check U204 Pin 4, 6,  Using Spectrum Analyzer GSM SAW Filter  5-A Test!!  Output ~ -59dbm ?  4-C) Check U201 Pin 5, Using  Spectrum Analyzer DCS SAW Filter  5-A Test!!  Output ~ -60dbm ?  4-D) Check Pin 38, 39, Using  Spectrum Analyzer Replace U203  RF Mixer  4-C) Test Output ~ -60dbm ?  4-E) Check Pin 44, 43, Using  Spectrum Analyzer Replace U200 IF SAW Filter  4-D) Test  Output ~ -65dbm ?  U203 Working  (RF RX path OK.)   GSM Handsets Lab.
  • Page 63 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 Pin 7 GSM Handsets Lab.
  • Page 64 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  RF Output~ -72dbm ?   5-B) Test!! 5-C) Check U202 Pin 7,9,  Using Spectrum Analyzer. Replace U202  RF Output   5-C) Test!! Pin 9 ~ -55dbm ? Pin 7 ~ 58dbm ?  Goto  Block 6 ! GSM Handsets Lab.
  • Page 65 Appendix. Rx Flow Chart & Solution GSM : CH40, -60dbm Block 6 Test)  U103 (RX/TX Switch) Check!! DCS : CH700, -60dbm Pin 9 Pin 16 GSM Handsets Lab.
  • Page 66 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  RF Output ?   6-B) Test!! 6-C) Check U103 Pin 9, 16,  Using Spectrum Analyzer. Replace U103  RF Output ~ -70dbm ?   6-C) Test!! RX Path Working ! GSM Handsets Lab.

  • Page 67: Tx Flow Chart & Solution

    Appendix. Tx Flow Chart & Solution Setting : After Initialize Agilent 8960, Test in EGSM or DCS Mode START  PIF Power On,  Test after Call 112 Block 7 Goto Block 7 Test TXIQ O.K.? U203 Check!! Block 8 Goto Block 8  Test TX VCO O.K.? U208 Check!! Block 9 Goto Block 9 Test PAM O.K.? U100 Check!! Block 10 Dictional Coupler Goto Block 10 Test  O.K.? U102, 104 Check!! Block 11 Goto Block 11 Test Antena Part TX O.K.? U103 Check!! TX Path Working ! GSM Handsets Lab.
  • Page 68 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) GSM Handsets Lab.
  • Page 69 Appendix. Tx Flow Chart & Solution 7-A) Check Pin 9(TXIP) & 10 번 (TXIN),  Pin 11(TXQP) & Pin 17(TXQN) Using Oscilloscope  4 Pin ALL  Just Pin 1,2 or 3  TXIQ Line Short ?  High Output ?  High Output ?  U501 (Nausica) is Not Working Check Short  Goto Block 8 !! Replace U501 Block 7) Test!! Reference  TXIQ Signal GSM Handsets Lab.
  • Page 70 Appendix. Tx Flow Chart & Solution GSM : CH62, DAC Value 560 Block 8 Test)  U208 (TX VCO) Check!! DCS : CH700, DAC Value 560  GSM_OUT  DCS_OUT GSM Handsets Lab.
  • Page 71 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 2.85V ?  2.85V  ?  Check U205 U207= U205( Same Function) 9-C) Check U208 Pin 7 9-C) Check U208 Pin 7. Low ?  U203 Is Not Working High  ?  Replace 9-D) Check U208 Pin  6, Using  Spectrum Analyzer 9-D) Check U208 Pin  10, Using  Spectrum Analyzer  Check Resistor   Check Resistor  & Capacitor & Capacitor TX Output ?  TX Output ?   OK?  OK? Replace U208  Replace U208 9-D) Test!! 9-D) Test!! Replace  9-D) Test!! Goto Block 10 !! GSM Handsets Lab.
  • Page 72 Appendix. Tx Flow Chart & Solution Block 9 Test)  U100 (PAM) Check!! GSM : CH62, DAC Value 560 DCS : CH700, DAC Value 560 GSM Handsets Lab.
  • Page 73 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 4.2V ?  Check Main Battery 4.2V  ?  9-C) Check Pin 6, Using Spectrum Analyzer 9-C) Check Pin 6, Using Spectrum Analyzer. Attenuator Check!! TX Output ~20dbm?  TX Output ~18dbm?  Check Short & Resistor Value 9-B) Test!!  Each Power   Each Power  Block 10 !! Level OK. ?  Level OK. ?  Block 9!! GSM Handsets Lab.
  • Page 74 Appendix. Tx Flow Chart & Solution GSM : CH62, DAC Value 560 Block 10 Test)  U102, 104 (Coupler) Check!! DCS : CH700, DAC Value 560 GSM Handsets Lab.
  • Page 75 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 C107 Valid? C123 Valid? RF Output ~ 20dbm?  RF Output ~ 18dbm?  (Short & Open) (Short & Open) 10-B) Test!! Replace U102, 104 10-B) Test!! Goto Block 11! GSM Handsets Lab.
  • Page 76 Appendix. Tx Flow Chart & Solution GSM : CH62, DAC Value 560 Block 11 Test)  U103 (RX/TX Switch) Check!! DCS : CH700, DAC Value 560 Pin 2 GSM Handsets Lab.
  • Page 77 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  RF Output ?   11-B) Test!! 11-C) Check U103 Pin 2,  Using Spectrum Analyzer. Replace U103  RF Output ~ 15dbm ?   11-C) Test!! TX Path Working ! GSM Handsets Lab.

  • Page 78: Mic Flow Chart & Solution

    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 Goto Block 12 Test MIC_BIAS  O.K.? F610 Check!! Block 13 Goto Block 13  Test Audio Signal Level O.K.? U900, U901 Check!! Check MIC Soldering MIC1 Check!! MIC Working ! GSM Handsets Lab.
  • Page 79 Appendix. MIC Flow Chart & Solution Block 12 Test)  MIC1 (MIC) Check!! GSM Handsets Lab.
  • Page 80 Appendix. MIC Flow Chart & Solution 12-A) Check Placement of  MIC1 12-B) Check F610 Using Osciolloscope Check Soldering F610, R614 , R616  2.5 V ?   12-B) Test!! Goto Block 13! GSM Handsets Lab.
  • Page 81 Appendix. MIC Flow Chart & Solution Block 13 Test)  MIC1 (MIC) Check!! GSM Handsets Lab.
  • Page 82 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 Check Soldering A few hundreds of  mV Signal  Replace U900, U901  are measured ?   13-1) Test!! MIC Working ! Reference  MIC Signal GSM Handsets Lab.

  • Page 83: Receive Flow Chart & Solution

    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 Goto Block 14 Test Detect Signal Level.? F605, F606 Check!! Block 15 Check Soldering CN301, CON900, Receiver Check!! RECEIVER  Working ! GSM Handsets Lab.
  • Page 84 Appendix. RECEIVE Flow Chart & Solution Block 14 Test)  F605, F606 Check!! Receiver GSM Handsets Lab.
  • Page 85 Appendix. RECEIVE Flow Chart & Solution 14-A) Check Placement of  RECEIVER 14-B) Check F605, F606 Using Osciolloscope Check Soldering F605, F606  Signal Detect ?   14-B) Test!! Goto Block 15! Replace U501 Reference  RECEIVER Signal GSM Handsets Lab.

  • Page 86: Lcd Flow Chart & Solution

    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  Reassemble LCD module with LCD connector on  With LCD connector PCB OK.? Block 16 LCD Driver  Goto Block 16 Test Source Voltage  3V ? U305 Pin 5 Check!! Block 17 Goto Block 17 Test Check Soldering CON 902 Check!! LCD  Working ! GSM Handsets Lab.
  • Page 87 Appendix. LCD Flow Chart & Solution Block 16 Test)  U305 Check!! GSM Handsets Lab.
  • Page 88 Appendix. LCD Flow Chart & Solution 16-A) Check Placement of U305 16-B) Check U305 Pin 3 Using Osciolloscope Check LCD_EN  Line Path >   Pin 3  3V ?   16-B) Test!! Replace U500 16-C) Check U305 Pin  5 Using Osciolloscope Check Soldering >   Pin 3  3V ?  U305   16-C) Test!! Goto Block 17! Replace U305 GSM Handsets Lab.
  • Page 89 Appendix. LCD Flow Chart & Solution Block 17 Test)  CON902 Check!! GSM Handsets Lab.
  • Page 90 Appendix. LCD Flow Chart & Solution 17-B) Check CON 902 Soldering & Line Path  Replace LCD Module is Working ?  LCD Module LCD Working ! Reference  LCD Signal GSM Handsets Lab.

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