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LG Electronics KS360 service manual Keypad back light trouble

Models: KS360

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5. Trouble shooting

5.10 Keypad back light trouble

Check Points

-Signal path is connected well

-TR is working properly

QWERTY_KEY BACKLIGHT

VBAT

		R310
LEWWS44-E	LD300	47
		R311
LEWWS44-E	LD301	47
		R312
LEWWS44-E	LD302	47

TP1

QWERTY_KEY_BL

VA301

ICVN0505X150FR

MULTI_KEY BACKLIGHT

VBAT

C101

100ohm

100ohm

100ohm

100ohm

100ohm

100ohm

100ohm

1u

R103

LEBB-S14E

R104

LEBB-S14E

R105

R106

LEBB-S14E

R107

LEBB-S14E

R108

LEBB-S14E

R109

LEBB-S14E

LD100

LD101

LD102

LEBBS14E- LD103

LD104

LD105

LD106

R110

TP2

Q100

SUB_KEY_BL

2SC5585

1K

R111

10K

TP1

TP2

C102

1u

LGE Internal Use Only	- 82 -	Copyright © 2008 LG Electronics. Inc. All right reserved.
		Only for training and service purposes

Image 81

LG Electronics KS360 service manual Keypad back light trouble, Signal path is connected well TR is working properly

Contents

Internal Use Only KS360Revised History Editor Date Issue Contents of Changes Version Kim JulPage Table Of Contents Page Regulatory Information PurposePictures Interference and AttenuationElectrostatic Sensitive Devices BER APCCC-CV CLAOpll LGEPAM PCBFeature Comment H/W FeatureANT HR/EFR/FR/AMRTechnical specification EgsmGSM900/EGSM Offset from Carrier kHz Description SpecificationDescription Specification DCS1800/PCS1900 Bit Error Ratio BER Class II 2.439% @-102dBmBER 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 RF Interface External Devices connected to memory interfaceDevice Name Maker Remark Resource Interconnection DescriptionADC channel Usart InterfaceUART0 UsifPort Function Net Name Description #Keypad Gpio mapDIFRESET1GPIO Keyint Cifresetgpio CamrstCIFD7 Cifpclk CampclkUsifrxdmrst Uartbtrx Usiftxdmtsr UartbttxUsifsclk Btvcxoen #I2S1 DAI-PCM I2S1CLK0Poresetn / SCANOUT2 ResetnFcdprbn TOUT5 TouchintBlock 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 DisplayLCD-ID ResetVCC1 MLED5Pin 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 Diagram19 18pin Multi Media Interface connector KM380 series MMIPin 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 DcxoPin Mame Description Power Amplifier ModuleVbatt GsminMain 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 Charging trouble 2V~3.75V75V~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 Power is working Socket soldering Proper SIM is used SIM & USD troubleSIM 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 Dome switch contacts Key coder IC soldering Qwerty Key troubleKey Check Points Waveform of Dcxo DomeswitchMain PCB Bottom Trouble Shooting of Receiver PartDcxo Checking Dcxo CircuitDcxo Cicuit Dcxo WaveformChecking Mobile SW & FEM Egsm DCS PCS ANTSW1ANTSW2 ANT SW1 ANT SW2 Mobile SW FEM Control SignalsSee RX Part 1. Checking Dcxo Circuit Trouble Shooting of Transmitter PartMode Checking Transceiver Output SignalsGsmk 8PSKTransceiver Output Gmsk Transceiver Output 8PSK Txlb Mode Gmsk TP1 Txlb Mode 8PSK TP1PAM Control Signals Checking PAM Control SignalsMode Palevel Txonpa PAM Mode Operation100 Gsmk Control Signal 8PSK Control SignalChecking FEM & Mobile SW Mobile SW & FEM Checking Points TX ModeOff FEM TX Control Logic 101102 TP1ANT SW1 TP2ANT SW2S/W download setup Download & upgrade setup Preparation103 104 Download program user guide105 Multi-Download Program SettingModel-Base106 Circuit Diagram 18PIN IO Connector Hall Effect S/W108 109 Audio AMP SUB System & Signal DistributorQwerty KEY 110SIM Connector Camera ConnectorCamera Power Backup Battery112 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 CN100Test Equipment Setup Calibration Step127 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 Main component Is ordered by Sbom standard on Gcsc144 145 146 ECCH0000393 147148 149 150 151 152 153 FILTER,EMI/POWER154 155 156 157 158 159 160 161