LG L705i Service Manual

Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes 3.3.1 Transmitter The UMTS Tx path begins with differential baseband signals (I and Q) from the MSM device. These analog input signals are amplified, filtered, and applied to the quadrature up-converter mixers. The up- converter output is amplified by multiple variable gain stages that provide transmit AGC control. The AGC output is filtered and applied to the driver amplifier; this output stage includes an integrated matching inductor that simplifies the external matching n ...

Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes 3. TECHNICAL BRIEF - 43 - 3.8.6. MSM6280 microprocessor subsystem ■ Industry standard ARM926EJ-S embedded microprocessor subsystem ❑ 16 kB instruction and 16 kB data cache ❑ Instruction set compatible with ARM7TDMI® ❑ ARM version 5TEJ instructions ❑ Higher performance 5 stage pipeline, Harvard cached architecture ❑ Higher internal CPU clock rate with on-chip cache ■ Java hardware acceleration ■ Enhanced memory support Please note that NOR/PSRAM will not be s ...

4. TROUBLE SHOOTING TP*:UMTS 800 Rx PATH TP: UMTS 2100 Rx PATH LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes NO NO NO NO NO YES YES YES YES YES Set the Phone Rx is ON Check Vbias/ Vbias' Over 2V? Check bidsblock soldering Check ANT Check the FEM FL100 Check Duplexer FL103, FL106 Check RTR6275, RER6275, FL101, FL107 Check TP1 Signal exist? Check TP2/TP2' Signal exist? Check TP3/TP3' Signal exist? Check TP4/TP4' Signal exist? Rx is OKCheck other Parts Z3X-BOX.COM ...

4. TROUBLE SHOOTING TP*:UMTS 800 Rx PATH TP: UMTS 2100 Rx PATH LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes NO NO NO NO NO YES YES YES YES YES Set the Phone Rx is ON Check Vbias/ Vbias' Over 2V? Check bidsblock soldering Check ANT Check the FEM FL100 Check Duplexer FL103, FL106 Check RTR6275, RER6275, FL101, FL107 Check TP1 Signal exist? Check TP2/TP2' Signal exist? Check TP3/TP3' Signal exist? Check TP4/TP4' Signal exist? Rx is OKCheck other Parts Z3X-BOX.COM ...

3. TECHNICAL BRIEF MAIN PCB TOP LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes Reference Description Reference Description LD1,LD2 LED TP1 Hall Sensor LD1 LD2 TP1 Main TOP Z3X-BOX.COM ...

Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes 11. EXPLODED VIEW & REPLACEMENT PART LIST - 191 - Level Location No. Description Part Number Spec Color Remark 6 R115 RES,CHIP,MAKER ERHZ0003801 5.1 ohm,1/16W ,J ,1005 ,R/TP 6 R116 RES,CHIP ERHY0009502 10 ohm,1/20W(0.05W) ,J ,0603 ,R/TP 6 R117 RES,CHIP ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP 6 R118 RES,CHIP,MAKER ERHZ0000473 39 ohm,1/16W ,J ,1005 ,R/TP 6 R119 RES,CHIP ERHY0009503 100 ohm,1/20W(0.05W) ,J ,0603 ,R/TP 6 R120 RES,CHIP,MAKER ERHZ0000415 130 ohm,1/16W ,J ,1005 ,R ...