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LG Electronics LG-C320 service manual TP4Receiver PAD=CN101 TP3FB102 TP3FB101

Models: LG-C320

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Page 68

4. TROUBLE SHOOTING

TP4_Receiver PAD=CN101

TP3_FB102

TP3_FB101

RCV_P

RCV_N

	TP3	100n		1	TP4
				CN101
	FB101
	FB102	100n		2
	TP3				TP4
39pF	39pF
C101	C102	VA101	VA102	Can be Changed to TVS or ECLAMP
				Can be Changed to TVS or ECLAMP

CN103

154

253

RCV_N	TP2	LCD_MAKER_ID
3	TP2	52
RCV_P		LCD_DATA[15]
4		51
		LCD_DATA[14]
5		50

TP2

Slide FPCB to Main PCB

Connector(CN103)

127

Copyright © 2010 LG Electronics. Inc. All right reserved.	- 69 -	LGE Internal Use Only
Only for training and service purposes

Image 68

LG Electronics LG-C320 service manual TP4Receiver PAD=CN101 TP3FB102 TP3FB101

Contents

LG-C320 Internal Use OnlyTable Of Contents LGE Internal Use Only Purpose Regulatory InformationElectrostatic Sensitive Devices PicturesInterference and Attenuation Abbreviations PAM PCBPGA PLLMain Parts GSM Solution Feature CommentProduct Name Supporting StandardHW Features Music Player MP3/AAC/AAC+/WMACdrom Stereo Headset Yes Data Cable Flash External MemorySW Features MMS Eons CphsENS 2M FFGSM transceiver specification Specification HW SpecC320 Figures QSC62703G disable Base band block General DescriptionProcessor 1 Processors and bus architectureMemory support and LCD interface EBI2QSC6270 3G disable Qvga MainQSC6270 ConnectivityQSC6270 3G disable has 78 configurable I/O pins GPIOsEnhanced GPS position location using gpsOne with RGR6240 IC Air interfacesInternal base band functions JTAG/ETMMultimedia Camera interface and video front-end7.2.1 MDP-to-LCD interface functional block diagram Mobile display processor7.2.2 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 Technical Brief SUB System KEY PADEBI1 Features EBI2 FeaturesExternal memory interface SdramCamera Interface 2M Camera 3.1 2M CameraTechnical Brief LCD Module LQ024Q3UX01 Sharp General DescriptionInput Signal and Power Pin Description Input Pin PIN DescriptionTechnical Brief Audio Signal Processing & Interface 41 Block diagram of RF part General Description 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 Block diagram of FEM 1 Control table of FEM 1 D5008 FL101 FEM2 Block diagram of GSM PAM Bluetooth BCM2070 Shows the Bluetooth system architecture in the LG-C320Bluetooth ConnectionGPIO with QSC6270 ESC6270 FM Receiver TEA5991FM TEA5991 2 pin description Power on Troubleshooting When Power key press? YesStart Than 3.20V? YesTP1 Charger Troubleshooting Connection OK? Change I/O connector YesCharger Troubleshooting Flow Yes Change TA Is it charging properly?TP1 FL401 USB Troubleshooting USB Troubleshooting FlowTP3 Usim Detect Troubleshooting Re-insert the SIM card Work well ?Yes Change the SIM card Work well ? Check J301TP1 TP2 TP3 Camera TroubleshootingTP4 TP4 TP3 TP1 TP2 CAM70MHz Pclk CAM24MHz MclkMain side view LED Troubleshooting Check battery Change QSC6270 Change LED YesKey press +VPWR is above 3.2V? Yes LED on ?Slide Key side view LED Troubleshooting SUB KEY B/L LCD Troubleshooting Change the Fpcb Move to KEY LED TroubleshootingLCD display OK? Yes Change SUB PCB LCD display OK? YesSlide Side view placement Above 3.0V or Linmotm Vibrator TroubleshootingVibrator is operate when DC motor driver is enabled Fsubfpcb to Main PCB ConnectorCN101 Main to Fsubfpcb ConnectorCN803Receiver Path Main to Slide Fpcb ConnectorCN801 TP1TP4Receiver PAD=CN101 TP3FB102 TP3FB101 TP1C506, C507? Change the IC501TP3FB505 TP3FB504 TP2R505 TP2R504 TP1C507 TP1C506 Speaker/Speaker Phone path Audio Sub TP1C509 TP1C508 SystemIC501 TP2FB507 TP2FB508 TP3 TP4 TP5CN102=Speaker Pad Main microphone Make a callMICBIASTP1C526 Work well?Mainmicp Headset microphone Insert Headset & Make a callTP2FB503? Yes TP3C263? YesHsgnd RF Component U201 X202 FL101 SW101 U101RF Path GSM pathTrouble Shooting of GSM Part GSM850/GSM900/1800/1900Setup Test Equipnment Cell power = -74dbm Egsm CHDCS1800 CH PCS1900 CH GSM850 CH Check Rx Part Tx PartChecking Front-End Module Block Check U201 Replace FL101TP1 TP2 Checking GSM Rx part GSM Rx is OKDCS/PCS = 17.3 Gpam Logic ControlTrouble Shooting Checking Bluetooth Block Bluetooth RF componentsRF component BT Main board bottom Reference Description ANTBluetooth Signal Path Bluetooth Signal Path Main board bottomBluetooth Trouble shooting TP#TP1 VREGMSMP2.6V TP2 VREGMSME1.8V TP3 TP4 BtantoutConnectivityANTPAD Class BT main clk 26MHzReference 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 Download LG-C320LG-C320 LGE Internal Use Only 101 102 103 104 105 106 107 108 LG-C320 LG-C320 109LG-C320 LG-C320 110LG-C20 111Block Diagram 112113 Usbvbus114 Vbat115 Memory116 117 118 119 ESC6270WM9093 120QSC6270 121122 Circuit Diagram 1232-1ESCESC6270 124NET Conn MCP2-12G1G DDRx16hynix 1263-2 1272-1 1286CH+4LDO,PWM 129ConnectivityANTPAD 1301-1 1311-3push1.50T 132KEY PCB 133Slide Fpcb 134Module Fpcb 135136 137 QSC6270 3G disableٛ- U200 bottom viewBGA Pin Map H8BCS0SI0BAR-46M MCP,NAND U300 EUSY0347506 138BCM2070B2KUBXG bluetooth U700 EUSY0418701 139140 141 WM9093 Ultra Low Power Audio Subsystem- IC500 EUSY0403901Bump CSP package Top View TEA5991FM Tuner- U701 EUSY0385901 142LD801/802 Main Key LED Can not use LED 143U101 GSM PAM IC401 MuicFL101 FEM C320KEYSPEY006820110TOP 145CN102 LCD Connector Can not use LCD Display, LCD Backlight 146C320FSLIDESPCY024690110TOP 147CN101 Fpcb Conn Can not use SD-card, Vibrator, Speaker 148Preparation work for setting RF cable loss ProcedureUsage of Tachyon for RF Calibration and Test 149150 Basic Setting of Tachyon for RF Calibration & TestSystem Option Setting Contents Log of RF Calibration and TestPhone Test Mode 152Order 153154 155 156 Exploded View & Replacement Part List 157158 159 160 161 162 163 LGC320.ABOOWA FlexibleHankook Molex Mobitech Corporation164 165 LG-C320 Boowa MainRESIN,PC TP TDK Korea Cooperation166 TP TDK CorporationKyocera Corp Rohm167 168 AUK CorpESM R/TP 3P KEC Corporaition 169FET H8BCS0SI0BAR-46M NAND/2G SDRAM/1G 1.7VTO1.9V 170IC,MCP,NAND 171 QCT Skyworks Solutions INC 172SPM0410LR5H-QB SPM0410LR5H-QB,UNIT,42 Printed Circuit Board Corp173 ECZH0001217Ceratech Corporation 174Microelectronics PLC Accessory 175