Manuals / LG Electronics / Cell Phone / Cell Phone

LG Electronics LG-C320 Main side view LED Troubleshooting, Key press +VPWR is above 3.2V? Yes

Models: LG-C320

1 174

Download 174 pages 1.25 Kb

Page 59

4. TROUBLE SHOOTING

4.6 Main side view LED Troubleshooting

MAIN Key Pad LED is on as below :

Key pressing Æ LED_CON go down low (below 0.8v) Æ MAIN Key Backlight LED On

START

Key press

+VPWR is above 3.2V?

Yes

When the LCD is on, TP1 is below 0.8v

Yes

LED ON ?

No

No

No

Check battery

Change QSC6270

Change LED

Yes

END

LGE Internal Use Only	- 60 -	Copyright © 2010 LG Electronics. Inc. All right reserved.
		Only for training and service purposes

Image 59

LG Electronics LG-C320 service manual Main side view LED Troubleshooting, Key press +VPWR is above 3.2V? Yes, LED on ?

Contents

Internal Use Only LG-C320Table Of Contents LGE Internal Use Only Regulatory Information PurposeElectrostatic Sensitive Devices PicturesInterference and Attenuation Abbreviations PLL PAMPCB PGASupporting Standard Main Parts GSM SolutionFeature Comment Product NameHW Features Stereo Headset Yes Data Cable Flash External Memory Music PlayerMP3/AAC/AAC+/WMA CdromSW Features 2M FF MMSEons Cphs ENSHW Spec GSM transceiver specification SpecificationC320 Figures General Description QSC62703G disable Base band block1 Processors and bus architecture ProcessorEBI2 Memory support and LCD interfaceQvga Main QSC6270 3G disableConnectivity QSC6270GPIOs QSC6270 3G disable has 78 configurable I/O pinsJTAG/ETM Enhanced GPS position location using gpsOne with RGR6240 ICAir interfaces Internal base band functionsCamera interface and video front-end MultimediaMobile display processor 7.2.1 MDP-to-LCD interface functional block diagram7.2.2 The LCD interface of C320 Hkadc Uart9 USB QSC6270HKADC Block diagram Valid external supply attachment and removal detection Power managementInput power management Output voltage regulation 2 Voltage regulator summary –”—“Œ›Œ‹ Charging controlˆ™Ž•Ž YlTŠˆ™Ž•Ž KEY PAD Technical Brief SUB SystemSdram EBI1 FeaturesEBI2 Features External memory interface3.1 2M Camera Camera Interface 2M CameraTechnical Brief General Description LCD Module LQ024Q3UX01 SharpPIN Description Input Signal and Power Pin Description Input PinTechnical Brief Audio Signal Processing & Interface General Description RF Part 41 Block diagram of RF partHigh-band Low-bandGSM 850 869 to 894 MHz and GSM 900 925 to 960 MHz 1 QSC GSM receiver signal paths functional diagram GSM Transmitter 1 D5008 FL101 FEM 1 Block diagram of FEM 1 Control table of FEM2 Block diagram of GSM PAM Shows the Bluetooth system architecture in the LG-C320 Bluetooth BCM2070Bluetooth ConnectionGPIO with QSC6270 ESC6270 FM Receiver TEA5991FM TEA5991 2 pin description Than 3.20V? Yes Power on TroubleshootingWhen Power key press? Yes StartTP1 Yes Change TA Is it charging properly? Charger TroubleshootingConnection OK? Change I/O connector Yes Charger Troubleshooting FlowTP1 FL401 USB Troubleshooting Flow USB TroubleshootingTP3 Check J301 Usim Detect TroubleshootingRe-insert the SIM card Work well ? Yes Change the SIM card Work well ?TP1 TP2 TP3 Camera TroubleshootingTP4 CAM70MHz Pclk CAM24MHz Mclk TP4 TP3 TP1 TP2LED on ? Main side view LED TroubleshootingCheck battery Change QSC6270 Change LED Yes Key press +VPWR is above 3.2V? YesSlide Key side view LED Troubleshooting SUB KEY B/L Change SUB PCB LCD display OK? Yes LCD TroubleshootingChange the Fpcb Move to KEY LED Troubleshooting LCD display OK? YesSlide Side view placement Above 3.0V or Linmotm Vibrator TroubleshootingVibrator is operate when DC motor driver is enabled Main to Fsubfpcb ConnectorCN803 Fsubfpcb to Main PCB ConnectorCN101Receiver Path TP1 Main to Slide Fpcb ConnectorCN801TP4Receiver PAD=CN101 TP3FB102 TP3FB101 Change the IC501 TP1C506, C507?TP3FB505 TP3FB504 TP2R505 TP2R504 TP1C507 TP1C506 Speaker/Speaker Phone path Audio Sub TP1C509 TP1C508 SystemIC501 TP2FB507 TP2FB508 TP3 TP4 TP5CN102=Speaker Pad Work well? Main microphoneMake a call MICBIASTP1C526Mainmicp TP3C263? Yes Headset microphoneInsert Headset & Make a call TP2FB503? YesHsgnd U201 X202 FL101 SW101 U101 RF ComponentGSM path RF PathGSM850/GSM900/1800/1900 Trouble Shooting of GSM PartCheck Rx Part Tx Part Setup Test Equipnment Cell power = -74dbmEgsm CH DCS1800 CH PCS1900 CH GSM850 CHCheck U201 Replace FL101 Checking Front-End Module BlockTP1 TP2 GSM Rx is OK Checking GSM Rx part17.3 Gpam Logic Control DCS/PCS =Trouble Shooting ANT Checking Bluetooth BlockBluetooth RF components RF component BT Main board bottom Reference DescriptionBluetooth Signal Path Main board bottom Bluetooth Signal PathTP4 Btantout Bluetooth Trouble shootingTP# TP1 VREGMSMP2.6V TP2 VREGMSME1.8V TP3ConnectivityANTPAD BT main clk 26MHz ClassReference Description U701 TEA5991FM module FM Signal PathChecking FM Radio Block FM Trouble shooting TP1 VREGMSMP2.6V TP2 VREGMSME1.8V TP3 Fmantin TP4 Fmoutaudio signalTP description LG-C320 DownloadLG-C320 LGE Internal Use Only 101 102 103 104 105 106 107 108 109 LG-C320 LG-C320110 LG-C320 LG-C320111 LG-C20112 Block DiagramUsbvbus 113Vbat 114Memory 115116 117 118 ESC6270 119120 WM9093121 QSC6270122 123 Circuit Diagram124 2-1ESCESC6270NET Conn 126 MCP2-12G1G DDRx16hynix127 3-2128 2-1129 6CH+4LDO,PWM130 ConnectivityANTPAD131 1-1132 1-3push1.50T133 KEY PCB134 Slide Fpcb135 Module Fpcb136 137 QSC6270 3G disableٛ- U200 bottom viewBGA Pin Map 138 H8BCS0SI0BAR-46M MCP,NAND U300 EUSY0347506139 BCM2070B2KUBXG bluetooth U700 EUSY0418701140 141 WM9093 Ultra Low Power Audio Subsystem- IC500 EUSY0403901Bump CSP package Top View 142 TEA5991FM Tuner- U701 EUSY0385901143 LD801/802 Main Key LED Can not use LEDU101 GSM PAM IC401 MuicFL101 FEM 145 C320KEYSPEY006820110TOP146 CN102 LCD Connector Can not use LCD Display, LCD Backlight147 C320FSLIDESPCY024690110TOP148 CN101 Fpcb Conn Can not use SD-card, Vibrator, Speaker149 Preparation work for setting RF cable lossProcedure Usage of Tachyon for RF Calibration and Test150 Basic Setting of Tachyon for RF Calibration & TestSystem Option Setting Log of RF Calibration and Test Contents152 Phone Test Mode153 Order154 155 156 157 Exploded View & Replacement Part List158 159 160 161 162 Mobitech Corporation 163LGC320.ABOOWA Flexible Hankook Molex164 TP TDK Korea Cooperation 165LG-C320 Boowa Main RESIN,PCRohm 166TP TDK Corporation Kyocera Corp167 AUK Corp 168ESM R/TP 3P KEC Corporaition 169FET H8BCS0SI0BAR-46M NAND/2G SDRAM/1G 1.7VTO1.9V 170IC,MCP,NAND 171 Printed Circuit Board Corp QCT Skyworks Solutions INC172 SPM0410LR5H-QB SPM0410LR5H-QB,UNIT,42ECZH0001217 173Ceratech Corporation 174Microelectronics PLC 175 Accessory