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

Models: KS360

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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

Page 91

Image 91

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

Contents

Internal Use Only KS360Revised History Editor Date Issue Contents of Changes Version Kim JulPage Table Of Contents Page Regulatory Information PurposeInterference and Attenuation PicturesElectrostatic Sensitive Devices CLA APCBER CC-CVPCB LGEOpll PAMHR/EFR/FR/AMR H/W FeatureFeature Comment ANTEgsm Technical specificationGSM900/EGSM Offset from Carrier kHz Description SpecificationBit 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 EVMOffset from carrierkHz Max. dBm 400 600 200 800 Due to modulation Offset from carrierkHzKS360 series Functional Block Diagram KS360 series Component Block diagramGeneral Description Baseband Processor BBP IntroductionBlock Description Resource Interconnection Description External Devices connected to memory interfaceRF Interface Device Name Maker RemarkUsif Usart InterfaceADC channel UART0Port Function Net Name Description #Keypad Gpio mapCifpclk Campclk Cifresetgpio CamrstDIFRESET1GPIO Keyint CIFD7#I2S1 DAI-PCM I2S1CLK0 Usiftxdmtsr UartbttxUsifrxdmrst Uartbtrx Usifsclk BtvcxoenTOUT5 Touchint ResetnPoresetn / SCANOUT2 FcdprbnBlock Description Power management ICTop level block diagram of the PMU Block of PMB8888 Usage LDO2V~3.74V 74V~3.64V 64V~3.45V 45V~3.35V ChargingRemote Power On Power ON/OFFSIM Circuit SIM interfaceMicro SD external memory Interface SD mode Pin No Name Type DescriptionMemory Circuit MemoryPin No Pin Name Description LCD DisplayMLED5 ResetLCD-ID VCC1Pin LCD connector circuit Keypad Configuration Circuit Keypad Switching & ScanningCLR Touch KEY Technical Brief Qwerty + MultiKeypad Backlight Circuit Keypad back-light illuminationCharge-Pump Circuit LCD back light illuminationISP & Camera Circuit ISPImage Signal ProcessorJtag & ETM Interface Circuit Jtag & ETM interface connectorAudio KS360 series Audio signal flow diagram as following diagramMicrophone circuit Audio amplifierCharging IC OVP Charging circuitBluetooth / FM Radio Circuit Diagram BluetoothcsrTechnical Brief FM Radio Bluetooth / FM Radio Block DiagramKM380 series MMI 19 18pin Multi Media Interface connectorPin Function Description Pin Multi port Circuit Diagram 18PIN IO ConnectorGeneral Description PMB 8888 Function Block DiagramGold Radio Circuit Diagram Receiver part Receiver Block Diagram of S-GOLDradioTransmitter part RF synthesizer Transmitter Architecture Block DiagramFront End Module control DcxoGsmin Power Amplifier ModulePin Mame Description VbattMain PCB Top Main PCB component placementMain PCB bottom Main PCB bottom placement MMI PAD KEY PCB Top Equipment setup Trouble shooting test setupCheck Points Power on TroubleTP2 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 ConnectorSignal is normal on Camera Trouble Connectors combination Fpcb statusStart Speaker pin contact Audio amp soldering SUB Pmic soldering Receiver & Speaker troubleTP4 MIC Microphone troubleTP1 Ear-MIc Jack Detection troubleVibrator trouble Connectors combinationCheck Vibrator Connector Combination Keypad back light trouble Signal path is connected well TR is working properlyCheck 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 workingCheck Micro SD card voltage 2V9VMMC Touch Check Points Touch troubleTP4 Qwerty Key trouble Dome switch contacts Key coder IC solderingKey Check Points Waveform of Dcxo DomeswitchMain PCB Bottom Trouble Shooting of Receiver PartDcxo Waveform Checking Dcxo CircuitDcxo Dcxo CicuitEgsm DCS PCS ANTSW1 Checking Mobile SW & FEMANTSW2 ANT SW1 ANT SW2 Mobile SW FEM Control SignalsSee RX Part 1. Checking Dcxo Circuit Trouble Shooting of Transmitter Part8PSK Checking Transceiver Output SignalsMode GsmkTransceiver Output Gmsk Transceiver Output 8PSK Txlb Mode Gmsk TP1 Txlb Mode 8PSK TP1PAM Mode Operation Checking PAM Control SignalsPAM Control Signals Mode Palevel Txonpa100 Gsmk Control Signal 8PSK Control Signal101 Mobile SW & FEM Checking Points TX ModeChecking FEM & Mobile SW Off FEM TX Control Logic102 TP1ANT SW1 TP2ANT SW2Download & upgrade setup Preparation S/W download setup103 104 Download program user guide105 Multi-Download Program SettingModel-Base106 Circuit Diagram Hall Effect S/W 18PIN IO Connector108 109 Audio AMP SUB System & Signal DistributorQwerty KEY 110Backup Battery Camera ConnectorSIM Connector Camera Power112 Bluetoothcsr 2V62VIO113 Main To Fpcb Connector Fpcb To Slide ConnectorRight 114Main Receiver 115116 117 BGA IC pin check U102, PMB8888118 BGA IC pin check U100, K5D1G12ACD-D075119 BGA IC pin check U303, MAX9877120 BGA IC pin check M600, BC5FM121 PCB Layout122 GSM RX123 LD100~106 No MultiKey Backlight124 125 LCD Connector CN100 No Power No Booting No Display126 Touch Connector CN102 No Touch Sense CN100Calibration Step Test Equipment Setup127 128 129 Adjust the number of times130 131 Calibration data will be saved to the following folder132 Normal Mode Ptest Mode133 Stand-alone Test134 Connected135 Tx Test136 Rx TestMF Test BB Test138 139 Exploded View & Replacement Part List140 Assy Exploded View141 Replacement Parts Mechanic component142 Exploded View & Replacement Part List143 Is ordered by Sbom standard on Gcsc Main component144 145 146 ECCH0000393 147148 149 150 151 152 153 FILTER,EMI/POWER154 155 156 157 158 159 160 161