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LG LG-600 Series Repair Manual Download Page 75

GSM Handsets Lab. 

75

Appendix.

  

Tx Flow Chart & Solution

10-A)  Check Placement of  U102, 104

10-B) Check U102 Pin 3, Using  Spectrum Analyzer

RF Output ~ 20dbm? 

Yes

No

Yes

No

No

Yes

No

GSM TX BAND

 

DCS TX BAND

 

Replace U102, 104

10-B) Test!!

10-B) Check U104 Pin 3, Using  Spectrum Analyzer

10-B) Test!!

C107 Valid?

(Short & Open)

C123 Valid?

(Short & Open)

Goto Block 11!

RF Output ~ 18dbm? 

Yes

Summary of Contents for LG-600 Series

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

Page 2: ...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 Table of Conten...

Page 3: ...ty 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 st...

Page 4: ...ift Keying GPIB General Purpose Interface Bus GPRS General Packet Radio Service GSM Global System for Mobile Communications UART Universal Asynchronous Receiver Transmitter 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 Tra...

Page 5: ...ormation 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 ...

Page 6: ...GSM Handsets Lab 6 2 TEST SETUP 2 1 Normal Setup COMPUTER LG 600 RS 232 CABLE COM1 I O Connector ...

Page 7: ... 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 GPIB GPIB COM1 GPIB GPIB CABLE RF IN OUT I O Connector ...

Page 8: ...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 ...

Page 9: ...Switch 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 ON ON OFF DC PS REMOTE H F DIP Switch H F Hands Free PS Power Supply ...

Page 10: ...GSM Handsets Lab 10 2 TEST SETUP D PIF JIG for LG 600 JTAG1 AUDIO JTAG2 MON UART PHONE TA MON Status UART Status Power PS DC IN 12V TA ...

Page 11: ...GSM Handsets Lab 11 3 ASSEMBLY INSTRUCTION 3 1 Assembly Disassembly ...

Page 12: ...GSM Handsets Lab 12 3 ASSEMBLY INSTRUCTION 3 2 Assembly Disassembly of Front Cover Components ...

Page 13: ...GSM Handsets Lab 13 3 ASSEMBLY INSTRUCTION 3 3 Assembly Disassembly of Folder ...

Page 14: ...GSM Handsets Lab 14 4 DOWNLOAD COMPUTER LG 600 RS 232 CABLE COM1 I O Connector 4 1 Download Setup ...

Page 15: ...dsets Lab 15 4 DOWNLOAD 4 2 Download Choose Target Connect Choose Correct Serial Port Press PWRON of LG 600 Erase all Erase and Program Appli Boot Downloading Software Download Completed Caution Remove Battery ...

Page 16: ...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 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 vers...

Page 17: ...r 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...

Page 18: ...st 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 ...

Page 19: ...his 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 suc...

Page 20: ... TROUBLE SHOOTING 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 Battery ...

Page 21: ... TROUBLE SHOOTING 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 Battery ...

Page 22: ...GSM Handsets Lab 22 6 TROUBLE SHOOTING 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 1 5 U207 Voltage Regulator ...

Page 23: ...ets Lab 23 6 TROUBLE SHOOTING 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 Back battery Switch ...

Page 24: ...GSM Handsets Lab 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 Replace Q600 Go on to the next page 5 4 FET ...

Page 25: ...GSM Handsets Lab 25 6 TROUBLE SHOOTING 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 Schottkey Diode ...

Page 26: ...GSM Handsets Lab 26 6 TROUBLE SHOOTING 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 Resistor ...

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

Page 28: ...HOOTING 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 Resistor Coil ...

Page 29: ...6 TROUBLE SHOOTING 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 5 6 6 U901 U900 5 5 6 5 6 U901 U900 Switch ...

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

Page 31: ...b 31 6 TROUBLE SHOOTING 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 Connector ...

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

Page 33: ...GSM Handsets Lab 33 6 TROUBLE SHOOTING 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 Transistor ...

Page 34: ... 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 Top Bottom Vibrator Receiver Main LCD Sub LCD LCD Module ...

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

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

Page 37: ...GSM Handsets Lab 37 6 TROUBLE SHOOTING 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 Transistor ...

Page 38: ...GSM Handsets Lab 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 1 2 LED ...

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

Page 40: ...ts Lab 40 6 TROUBLE SHOOTING 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 Connector ...

Page 41: ...GSM Handsets Lab 41 6 TROUBLE SHOOTING 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 Voltage Regulator ...

Page 42: ...GSM Handsets Lab 42 6 TROUBLE SHOOTING 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 Switch ...

Page 43: ...6 TROUBLE SHOOTING 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 VCTCXO ...

Page 44: ...UBLE SHOOTING 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 1 Q200 1 Transistor ...

Page 45: ...GSM Handsets Lab 45 6 TROUBLE SHOOTING 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 Voltage Regulator ...

Page 46: ...Handsets Lab 46 6 TROUBLE SHOOTING 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 Resistor ...

Page 47: ...sets Lab 47 6 TROUBLE SHOOTING 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 Transistor ...

Page 48: ...Lab 48 Appendix RF components 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 ...

Page 49: ... Handsets Lab 49 Appendix RF components 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 ...

Page 50: ...S IFI IFIX RX1 RX1X RX2 RX2X MO MOX LO1 LO1X OSW PLL_ON MAX2652 LNAG LNAON BSW 0 GSM 1 DCS BSW PA_ON RXIP RXIN RXQP RXQN LO1X 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 70dBm 1 72dBm 2 55dBm 3 58dBm 4 60dBm 9 65dBm 10 GSM CH40 60dBm DCS CH700 60dBm ...

Page 51: ...FIX RX1 RX1X RX2 RX2X MO MOX LO1 LO1X OSW PLL_ON MAX2652 LNAG LNAON BSW 0 GSM 1 DCS BSW PA_ON RXIP RXIN RXQP RXQN LO1X 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 70dBm 1 72dBm 2 55dBm 3 58dBm 4 60dBm 9 65dBm 10 GSM CH62 DAC value 600 DCS CH700 DAC value 700 ...

Page 52: ... K Ref Clock 13MHz O K Yes 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 No Yes Block 2 Block 3 Block 4 Block 6 No Antenna Part RX O K Goto Block 2 Test Goto Block 3 Test Goto Block 4 Test No U107 U103 Check Yes RX Path Working RF LNA Filter O K FL1 U202 Check Block 4 No Goto Block 5 Test Yes Goto Block 6 Test ...

Page 53: ...GSM Handsets Lab 53 Appendix Rx Flow Chart Solution Block 2 Test 1 U207 RF 2 85V LDO Check Pin 1 Pin 3 Pin 5 ...

Page 54: ... Check Pin 5 Using Oscilloscope RF2V8 O K No Yes Check Placement of U207 VBAT Line Check Short Using Multi Meter If it has not problem Check Placement of U207 Check RF2 85V Line Short Using Multi Meter Replace U207 2 B Test U207 Working Goto Block 3 2 B Check Pin 3 Using Oscilloscope Pin 3 High Yes Check U903 Goto Next Page No If it has not problem ...

Page 55: ...GSM Handsets Lab 55 Appendix Rx Flow Chart Solution Pin 1 Pin 5 Block 2 Test 2 U903 Check ...

Page 56: ... Pin 5 High No Yes Check Placement of U903 EN Line Check Short Using Multi Meter If it has not problem Replace U500 2 B Test Goto Block 2 Test 1 2 C Check Pin 1 Using Oscilloscope Pin 1 High Yes Replace U903 No 2 A Check Pin 2 Using Oscilloscope Voltatge 2 V No Yes Replace Backup Battery ...

Page 57: ...GSM Handsets Lab 57 Appendix Rx Flow Chart Solution Block 3 Test U212 13MHz Oscillator Check Pin 1 CTL Pin 4 VCC 15 번 핀 Pin 3 Output ...

Page 58: ...ut No Yes Replace U211 Replace U212 3 C Test Pin 1 High AFC Line Short No 13MHz Line Short Yes No Yes Check Short 3 C Test Yes No U212 Working Goto Block 4 Q200 Working U211 Pin 5 2 7 V No Check Short 3 B Test 3 A Check Placement of U212 Yes Yes Replace U501 Replace Q200 3 C Test No 3 C Check Pin 3 Using Oscilloscope ...

Page 59: ...GSM Handsets Lab 59 Appendix Rx Flow Chart Solution Block 4 Test U203 RF Main IC Check Pin 4 6 1 Pin 5 4 Pin 38 39 2 Pin 43 449 3 GSM CH40 60dbm DCS CH700 60dbm ...

Page 60: ...A 5 LF 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 LO1X 1285 1361MHz 1445 1520MHz LO VCO MQE956 B4115 SAFC1842 5 60dBm 4 58dBm 1 60dBm 2 65dBm 3 ...

Page 61: ... NA 5 LF 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 LO1X 1285 1361MHz 1445 1520MHz LO VCO MQE956 B4115 SAFC1842 5 60dBm 4 58dBm 1 60dBm 2 65dBm 3 GSM CH40 60dbm DCS CH700 60dbm ...

Page 62: ...Check Placement of U203 No 4 C Check U201 Pin 5 Using Spectrum Analyzer Yes U203 Working RF RX path OK DCS SAW Filter Output 60dbm 5 A Test No Yes IF SAW Filter Output 65dbm Replace U200 4 D Test No Yes 4 D Check Pin 38 39 Using Spectrum Analyzer RF Mixer Output 60dbm Replace U203 4 C Test No Yes 4 E Check Pin 44 43 Using Spectrum Analyzer ...

Page 63: ...GSM Handsets Lab 63 Appendix Rx Flow Chart Solution Block 5 Test U202 LNA FL1 Dual Band Pass Filter Check Pin 5 Pin 7 GSM CH40 60dbm DCS CH700 60dbm FL1 U202 Pin 7 Pin 9 ...

Page 64: ... Check FL1 Pin 5 7 Using Spectrum Analyzer RF Output Pin 9 55dbm Pin 7 58dbm 5 A Check Placement of U202 FL1 No Yes Check Soldering Replace FL1 5 B Test 5 C Check U202 Pin 7 9 Using Spectrum Analyzer RF Output 72dbm No Yes Replace U202 5 C Test Goto Block 6 ...

Page 65: ...GSM Handsets Lab 65 Appendix Rx Flow Chart Solution Block 6 Test U103 RX TX Switch Check Pin 9 Pin 16 GSM CH40 60dbm DCS CH700 60dbm ...

Page 66: ...ck U107 Mobile Switch Pin 1 2 S W Signal Line Using Spectrum Analyzer RF Output 70dbm 6 A Check Placement of U103 No Yes Check Soldering Replace U107 6 B Test 6 C Check U103 Pin 9 16 Using Spectrum Analyzer RF Output No Yes Replace U103 6 C Test RX Path Working ...

Page 67: ...n Test after Call 112 TXIQ O K TX VCO O K PAM O K Yes Yes Yes U203 Check U208 Check No No 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 Yes No Goto Block 10 Test U102 104 Check Antena Part TX O K Yes No Goto Block 11 Test U103 Check Block 9 Block 10 TX Path Working ...

Page 68: ...GSM Handsets Lab 68 Appendix Tx Flow Chart Solution Block 7 Test U203 TXIQ Check Pin 9 10 TxI GSM CH62 DAC Value 560 DCS CH700 DAC Value 560 Pin 11 12 TxQ ...

Page 69: ...A Check Pin 9 TXIP 10 번 TXIN Pin 11 TXQP Pin 17 TXQN Using Oscilloscope 4 Pin ALL High Output No Just Pin 1 2 or 3 High Output TXIQ Line Short No Check Short Block 7 Test Yes Yes Yes Goto Block 8 U501 Nausica is Not Working Replace U501 Reference TXIQ Signal ...

Page 70: ...GSM Handsets Lab 70 Appendix Tx Flow Chart Solution Block 8 Test U208 TX VCO Check GSM_OUT DCS_OUT GSM CH62 DAC Value 560 DCS CH700 DAC Value 560 ...

Page 71: ...Pin 10 Using Oscilloscope Low No High Yes Yes No 9 C Check U208 Pin 7 9 D Check U208 Pin 6 Using Spectrum Analyzer 9 D Check U208 Pin 10 Using Spectrum Analyzer TX Output TX Output Yes Yes Replace 9 D Test No No Yes Yes Replace U208 9 D Test Replace U208 9 D Test No Goto Block 2 Check U205 No Goto Block 10 GSM TX BAND DCS TX BAND U203 Is Not Working Replace U207 U205 Same Function Check Resistor C...

Page 72: ...GSM Handsets Lab 72 Appendix Tx Flow Chart Solution Block 9 Test U100 PAM Check GSM CH62 DAC Value 560 DCS CH700 DAC Value 560 ...

Page 73: ...sing Spectrum Analyzer TX Output 18dbm Yes No Yes No 4 2V No 4 2V Yes Yes No 9 B Check Pin 4 5 Using Oscilloscope GSM TX BAND DCS TX BAND Check Main Battery 9 C Check Pin 6 Using Spectrum Analyzer Attenuator Check Check Short Resistor Value 9 B Test Each Power Level OK No Yes Yes No Each Power Level OK Block 10 Block 9 TX Output 20dbm ...

Page 74: ...GSM Handsets Lab 74 Appendix Tx Flow Chart Solution Block 10 Test U102 104 Coupler Check GSM CH62 DAC Value 560 DCS CH700 DAC Value 560 ...

Page 75: ...102 104 10 B Check U102 Pin 3 Using Spectrum Analyzer RF Output 20dbm Yes No Yes No No Yes No GSM TX BAND DCS TX BAND Replace U102 104 10 B Test 10 B Check U104 Pin 3 Using Spectrum Analyzer 10 B Test C107 Valid Short Open C123 Valid Short Open Goto Block 11 RF Output 18dbm Yes ...

Page 76: ...GSM Handsets Lab 76 Appendix Tx Flow Chart Solution Block 11 Test U103 RX TX Switch Check Pin 2 GSM CH62 DAC Value 560 DCS CH700 DAC Value 560 ...

Page 77: ...ck U107 Mobile Switch Pin 1 2 S W Signal Line Using Spectrum Analyzer RF Output 15dbm 11 A Check Placement of U103 No Yes Check Soldering Replace U107 11 B Test 11 C Check U103 Pin 2 Using Spectrum Analyzer RF Output No Yes Replace U103 11 C Test TX Path Working ...

Page 78: ... Initialize Agilent 8960 Test in EGSM or DCS Mode START PIF Power On Test after Call 112 MIC_BIAS O K Audio Signal Level O K Check MIC Soldering Yes Yes Yes F610 Check U900 U901 Check No No Block 12 Block 13 Goto Block 12 Test Goto Block 13 Test MIC1 Check MIC Working ...

Page 79: ...GSM Handsets Lab 79 Appendix MIC Flow Chart Solution Block 12 Test MIC1 MIC Check ...

Page 80: ...GSM Handsets Lab 80 Appendix MIC Flow Chart Solution 12 B Check F610 Using Osciolloscope 12 A Check Placement of MIC1 No Yes Check Soldering F610 R614 R616 12 B Test 2 5 V Goto Block 13 ...

Page 81: ...GSM Handsets Lab 81 Appendix MIC Flow Chart Solution Block 13 Test MIC1 MIC Check ...

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

Page 83: ...ution Setting After Initialize Agilent 8960 Test in EGSM or DCS Mode START PIF Power On Test after Call 112 Detect Signal Level Yes F605 F606 Check No Block 14 Goto Block 14 Test RECEIVER Working Check Soldering Yes CN301 CON900 Receiver Check Block 15 ...

Page 84: ...GSM Handsets Lab 84 Appendix RECEIVE Flow Chart Solution Block 14 Test F605 F606 Check Receiver ...

Page 85: ...ppendix RECEIVE Flow Chart Solution 14 B Check F605 F606 Using Osciolloscope 14 A Check Placement of RECEIVER No Yes Check Soldering F605 F606 14 B Test Signal Detect Goto Block 15 Reference RECEIVER Signal Yes Replace U501 ...

Page 86: ...r DCS Mode START PIF Power On Test after Call 112 LCD Driver Source Voltage 3V Yes U305 Pin 5 Check No Block 16 Goto Block 16 Test Contact of LCD module with LCD connector on PCB OK Yes No Reassemble LCD module With LCD connector Check Soldering Yes CON 902 Check No Goto Block 17 Test LCD Working Block 17 ...

Page 87: ...GSM Handsets Lab 87 Appendix LCD Flow Chart Solution Block 16 Test U305 Check ...

Page 88: ...6 B Check U305 Pin 3 Using Osciolloscope 16 A Check Placement of U305 No Yes Check LCD_EN Line Path 16 B Test Pin 3 3V Goto Block 17 Yes Replace U500 16 C Check U305 Pin 5 Using Osciolloscope No Yes Check Soldering U305 16 C Test Pin 3 3V Replace U305 Yes ...

Page 89: ...GSM Handsets Lab 89 Appendix LCD Flow Chart Solution Block 17 Test CON902 Check ...

Page 90: ...GSM Handsets Lab 90 Appendix LCD Flow Chart Solution 17 B Check CON 902 Soldering Line Path No Yes Replace LCD Module LCD Module is Working LCD Working Reference LCD Signal ...

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