Trouble Shooting of Receiver Part | LG Electronics KS360 instruction

5. Trouble shooting

5.14 Trouble Shooting of Receiver Part

START

Setup Test Equipment

Cell Power : ñ74dBm

EGSM CH30

DCS CH699

VCTCXO

Check point	MobileSW&FEM
VCTCXO

PLL

Check point

PLL Control

Check point

Mobile SW & FEM

Re-Download S/W & CAL

Main PCB Bottom

LGE Internal Use Only	- 92 -	Copyright © 2008 LG Electronics. Inc. All right reserved.
		Only for training and service purposes

Image 91

LG Electronics KS360 service manual Trouble Shooting of Receiver Part, Main PCB Bottom

Contents

Internal Use Only KS360 Revised History Editor Date Issue Contents of Changes Version Kim JulPage Table Of Contents Page Regulatory Information Purpose Interference and Attenuation PicturesElectrostatic Sensitive Devices CLA APCBER CC-CV PCB LGEOpll PAM HR/EFR/FR/AMR H/W FeatureFeature Comment ANT Egsm Technical specificationGSM900/EGSM Offset from Carrier kHz Description Specification Bit Error Ratio BER Class II 2.439% @-102dBm Description Specification DCS1800/PCS1900BER Class II 2.439% @-100dBm Rx Level Report accuracy Stmr General Performance DCS1800, PCS1900 RMS EVM Offset from carrierkHz Max. dBm 400 600 200 800 Due to modulation Offset from carrierkHz KS360 series Functional Block Diagram KS360 series Component Block diagram General Description Baseband Processor BBP Introduction Block Description Resource Interconnection Description External Devices connected to memory interfaceRF Interface Device Name Maker Remark Usif Usart InterfaceADC channel UART0 Port Function Net Name Description #Keypad Gpio map Cifpclk Campclk Cifresetgpio CamrstDIFRESET1GPIO Keyint CIFD7 #I2S1 DAI-PCM I2S1CLK0 Usiftxdmtsr UartbttxUsifrxdmrst Uartbtrx Usifsclk Btvcxoen TOUT5 Touchint ResetnPoresetn / SCANOUT2 Fcdprbn Block Description Power management IC Top level block diagram of the PMU Block of PMB8888 Usage LDO 2V~3.74V 74V~3.64V 64V~3.45V 45V~3.35V Charging Remote Power On Power ON/OFF SIM Circuit SIM interface Micro SD external memory Interface SD mode Pin No Name Type Description Memory Circuit Memory Pin No Pin Name Description LCD Display MLED5 ResetLCD-ID VCC1 Pin LCD connector circuit Keypad Configuration Circuit Keypad Switching & Scanning CLR Touch KEY Technical Brief Qwerty + MultiKeypad Backlight Circuit Keypad back-light illumination Charge-Pump Circuit LCD back light illumination ISP & Camera Circuit ISPImage Signal Processor Jtag & ETM Interface Circuit Jtag & ETM interface connector Audio KS360 series Audio signal flow diagram as following diagram Microphone circuit Audio amplifier Charging IC OVP Charging circuit Bluetooth / FM Radio Circuit Diagram Bluetoothcsr Technical Brief FM Radio Bluetooth / FM Radio Block Diagram KM380 series MMI 19 18pin Multi Media Interface connectorPin Function Description Pin Multi port Circuit Diagram 18PIN IO Connector General Description PMB 8888 Function Block Diagram Gold Radio Circuit Diagram Receiver part Receiver Block Diagram of S-GOLDradio Transmitter part RF synthesizer Transmitter Architecture Block Diagram Front End Module control Dcxo Gsmin Power Amplifier ModulePin Mame Description Vbatt Main PCB Top Main PCB component placement Main PCB bottom Main PCB bottom placement MMI PAD KEY PCB Top Equipment setup Trouble shooting test setup Check Points Power on Trouble TP2 Trouble shooting 2V~3.75V Charging trouble75V~3.64V 3.64V~3.45V 3.45V~3.35V TP1 TP2 LCD display trouble Main To Fpcb Connector Signal is normal on Camera Trouble Connectors combination Fpcb status Start Speaker pin contact Audio amp soldering SUB Pmic soldering Receiver & Speaker trouble TP4 MIC Microphone trouble TP1 Ear-MIc Jack Detection trouble Vibrator trouble Connectors combination Check Vibrator Connector Combination Keypad back light trouble Signal path is connected well TR is working properly Check All of LEDs solder Check Vbat Check Battery Yes SIM & USD trouble Power is working Socket soldering Proper SIM is usedSIM Check Points Soldered well? Yes USD Check Points Power is working Socket soldering Card detect is working Check Micro SD card voltage 2V9VMMC Touch Check Points Touch trouble TP4 Qwerty Key trouble Dome switch contacts Key coder IC solderingKey Check Points Waveform of Dcxo Domeswitch Main PCB Bottom Trouble Shooting of Receiver Part Dcxo Waveform Checking Dcxo CircuitDcxo Dcxo Cicuit Egsm DCS PCS ANTSW1 Checking Mobile SW & FEMANTSW2 ANT SW1 ANT SW2 Mobile SW FEM Control Signals See RX Part 1. Checking Dcxo Circuit Trouble Shooting of Transmitter Part 8PSK Checking Transceiver Output SignalsMode Gsmk Transceiver Output Gmsk Transceiver Output 8PSK Txlb Mode Gmsk TP1 Txlb Mode 8PSK TP1 PAM Mode Operation Checking PAM Control SignalsPAM Control Signals Mode Palevel Txonpa 100 Gsmk Control Signal 8PSK Control Signal 101 Mobile SW & FEM Checking Points TX ModeChecking FEM & Mobile SW Off FEM TX Control Logic 102 TP1ANT SW1 TP2ANT SW2 Download & upgrade setup Preparation S/W download setup103 104 Download program user guide 105 Multi-Download Program SettingModel-Base 106 Circuit Diagram Hall Effect S/W 18PIN IO Connector108 109 Audio AMP SUB System & Signal Distributor Qwerty KEY 110 Backup Battery Camera ConnectorSIM Connector Camera Power 112 Bluetoothcsr 2V62VIO 113 Main To Fpcb Connector Fpcb To Slide Connector Right 114 Main Receiver 115 116 117 BGA IC pin check U102, PMB8888 118 BGA IC pin check U100, K5D1G12ACD-D075 119 BGA IC pin check U303, MAX9877 120 BGA IC pin check M600, BC5FM 121 PCB Layout 122 GSM RX 123 LD100~106 No MultiKey Backlight 124 125 LCD Connector CN100 No Power No Booting No Display 126 Touch Connector CN102 No Touch Sense CN100 Calibration Step Test Equipment Setup127 128 129 Adjust the number of times 130 131 Calibration data will be saved to the following folder 132 Normal Mode Ptest Mode 133 Stand-alone Test 134 Connected 135 Tx Test 136 Rx Test MF Test BB Test 138 139 Exploded View & Replacement Part List 140 Assy Exploded View 141 Replacement Parts Mechanic component 142 Exploded View & Replacement Part List 143 Is ordered by Sbom standard on Gcsc Main component144 145 146 ECCH0000393 147 148 149 150 151 152 153 FILTER,EMI/POWER 154 155 156 157 158 159 160 161