LG Electronics LG-C320 4.19.2 FM Trouble shooting

- 97 -

Only for training and service purposes

LGE Internal Use Only

4. TROUBLE SHOOTING

START

TP1, TP2 Check the Sianal Change the main board

Yes

Change the main board

TP3 Check the Signal Change the Ear Jack

Yes

TP4 Check the Signal Change the U601

Yes

4.19.2 FM Trouble shooting

Contents

Main Table Of Contents Page 1. INTRODUCTION Introduction 1.1 Purpose 1.2 Regulatory Information A. Security B. Incidence of Harm Page 1.3 Abbreviations 1. INTRODUCTION 2. PERFORMANCE 2.1 Product Name 2.2 Supporting Standard 2.3 Main Parts : GSM Solution - 10 - 2.4 HW Features Page - 12 - 2.5 SW Features Page 2.6 HW SPEC. Page Page 3.1.1 Processor 3.1.2 Memory support (and LCD interface) QSC6270 (3G disable) Page 3.1.3 Connectivity QSC6270 Figure 3.1.4 GPIOs of C320 - 21 - Copyright 2010 LG Electronics. Inc. All right reserved. 3.1.4 GPIOs QSC6270 (3G disable has 78 configurable I/O pins 3.1.5 Air interfaces 3.1.6 Internal base band functions 3.1.7 Multimedia Page - 25 - Figure 3.1.7.2.2 The LCD interface of C320 3.1.8 UART 3.1.9 USB 3.1.10 HKADC Page 3.2 Power management 3.2.1 Input power management 3.2.2 Output voltage regulation Page 3.2.3 Charging control kGG kGuv{G 3.3 SUB SYSTEM 3.3.1 KEY PAD 3.3.2 External memory interface Page - 35 - 3.3.4 LCD Module (LQ024Q3UX01 : SHARP) Page Page 3.3.5 Audio Signal Processing & Interface 3.4 GENERAL DESCRIPTION (RF Part) 3.5 GSM MODE 3.5.1 GSM RECEIVER Page - 43 - G 3.5.2 GSM TRANSMITTER 3.6 OFF-CHIP RF COMPONENTS 3.6.1 D5008 (FL101: FEM) Page 3.7 OFF-CHIP COMPONENTS 3.7.1 Bluetooth (BCM2070) Page 3.7.2 FM Receiver (TEA5991) SYMBOL HVQFN WLCSP DESCRIPTION 4. TROUBLE SHOOTING Power ON Troubleshooting 5. Base band part 4.1 Power ON Troubleshooting Power ON Troubleshooting 4.2 Charger Troubleshooting Charger Troubleshooting Page USB Troubleshooting 4.3 USB Troubleshooting USB Initial sequence is : Isert USB Cable USB_VBUS +5V Check IC400 triggered USB IF work USB Troubleshooting USIM Troubleshooting 4.4 USIM Detect Troubleshooting USIM Troubleshooting TP1 TP3TP2 4.5 Camera Troubleshooting Camera control signals are generated by QSC6270. Page Main side view LED Troubleshooting 4.6 Main side view LED Troubleshooting Slide Key side view LED Troubleshooting 4.7 Slide Key side view LED Troubleshooting - 62 - Slide Key side view Troubleshooting WLED_VOUT SLIDE_KEY_LED LED SUB KEY B/L LCD Troubleshooting 4.8 LCD Troubleshooting LCD control signals are generated by QSC6270. The signal path is : QSC6270 CN102LCD Module Page Vibrator Troubleshooting 4.9 Vibrator Troubleshooting Vibrator is operate when DC motor driver is enabled. Page 4.10 Receiver Path Main to Slide FPCB Connector(CN801) - 68 - 1 27 TP1 - 69 - TP4_ReceiverPAD=CN101 Slide FPCB to Main PCB Connector(CN103) TP3_FB101 TP2 4.11 Headset path Page - 72 - Audio Sub system IC501TP1_C506TP1_C507 4.12 Speaker/Speaker Phone path TP1_C508 Audio Sub System(IC501) TP1_C509 TP2_FB507 TP2_FB508 TP3 - 76 - F_SUB_FPCB to Main PCB Connector(CN101) 1 10 TP4 TP5_CN102(=Speaker Pad) 4.13 Main microphone MIC501 VMIC_BIAS_P(TP1_C526) MAIN_MIC_P(TP2_C261) MIC1P PAD of QSC6270(3G disable) Page 4.14 Headset microphone Page G G G UG 4.15 RF Component 4.16 RF Path Page Page 4.17.1 Checking Front-End Module Block 4.17.1 Checking Front-End Module Block HG G G G G UUHG G G G G UG G G HG G G G G UUHG G G G G UG G G 51 51 51 51 4.17.2 Checking GSM Rx part 4.17.3 Checking GSM Tx part 4.17.3 Checking GSM Tx part Table 4.17.3 GPAM Logic Control Page 4.18 Checking Bluetooth Block 4.18.1 BLUETOOTH RF components Page 4.18.3 BLUETOOTH Trouble shooting 4.18.3 BLUETOOTH Trouble shooting Page - 95 - [BT main clk : 26MHz] {wX {wY Class 1.5 {wZ {w[G Page 4.19.2 FM Trouble shooting XUXU X {wYG {wZG {w[G TP1 TP2 TP3 TP4 Page Page Page Page Page Page Page Page Page Page 5. DOWNLOAD Page Page Page - 113 - ESC6270POWER 51#F653#KZ#Eorfn#Gldjudp#=#Srzhu#b4# POWER ESC6270 USB_VBUS _ 51#F653#KZ#Eorfn#Gldjudp#=#Srzhu#b5# VBAT VBAT RT9396 (SUB PMIC) GSM PAM (TQM7M5012) 61#F653#KZ#Eorfn#Gldjudp#=#EE MIC S QSC GPIO DC MOTOR Page - 117 - 81#F653#KZ#Eorfn#Gldjudp#=#Frqqhfwlylw|+EW2ZLIL2IP,brswlrq - 118 - 81#F653#KZ#Eorfn#Gldjudp#=#Frqqhfwlylw|+EW2IP, - 119 - 91#F653#KZ#Eorfn#Gldjudp#=#Phpru| (SIM PLUS) SDRAM HYNIX MCP (H8BCSOSIOBAR) NAND Flash (2Gbit) :1#F653#KZ#Eorfn#Gldjudp#=#Dxglr ESC6270 TEA5991 WM9093 - 121 - ;1#F653#KZ#Eorfn#Gldjudp#=#YLVXDO+#OFG#)#FDPHUD#, 5channel RT9396GQW QSC6270 Page 1-2-1-3_ESC-Quad EDGE - 123 - ANTENNA SWITCH MODULE LOGIC 2-2-2-1_ESC_ESC6270 - 124 - 2-2-2-1_ESC_ESC6270 - 125 - NET Conn MCP2-1_2G_1G DDRx16_hynix 3-3-1_6P_USIM ENSY0024301 - 126 - Page - 128 - 5-1-2-1 4-4-2-3 5-4-1-1 6CH+4LDO,PWM 6-2-2-1 - 129 - R603 WLED1 Connectivity_ANT_PAD Class 1.5 - 131 - 8-1-1-1 3-2-1-3_push_1.50T - 132 - - 133 - 16 15 14 13 12 11 10 9 87654321 L K J I H G F E D C B A KEY PCB - 134 - L K J I H G F E D C B A 12 11 10 98 7 6 5 4 3 2 1 Slide FPCB to Main PCB Slide FPCB to KEY PCB(Slide) (54Pin) SLIDE FPCB MAIN RECEIVER - 135 - SPK Common Circuit From Module FPCB to Main PCB Connector MICRO SD MODULE FPCB Page 8. BGA PIN MAP 8. BGA PIN M AP 1. BGA PIN MAP Page 8. BGA PIN MAP Page Page Page C320_MAIN_SPFY0235601_1.1_TOP - 143 - LD801/802 Main Key LED - Can not use LED U801 Hall IC - Can not use Slide Detection IC501 Audio Sub System - Can not use Sound,Headset - 144 - C320_MAIN_SPFY0235601_1.1_BOT C237 C226 21 C408 C320_KEY_SPEY0068201_10_TOP LD107/LD108/LD106/LD104/LD105/LD103 Sub Key LED - Can not use LED - 146 - CN101 CN102 C320_KEY_SPEY0068201_10_BOT C320_F_SLIDE_SPCY0246901_10_TOP 1 S 01 C320_F_SUB_SPCY0247101_10_BOT 10. RF CALIBRATION 10. RF CALIBRATION 10.1.2 Basic Setting of Tachyon for RF Calibration & Test 10. RF CALIBRATION 10.1.3 Log of RF Calibration and Test 11. TEST ALONE Phone Test Mode : LG-C320 - 153 - Phone Test Mode Scenario - 154 - - 155 - Page 12. EXPLODED VIEW & REPLACEMENT PART LIST 12.1 EXPLODED VIEW Page - 159 - 12.2 Replacement Parts <Mechanic component> - 160 - - 161 - - 162 - - 163 - 12.2 Replacement Parts <Main component> - 164 - - 165 - - 166 - - 167 - - 168 - - 169 - - 170 - - 171 - - 172 - - 173 - - 174 - 12.3 Accessory - 175 -