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LG Electronics U250 service manual 132

Models: U250

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5. DOWNLOAD

•Click on Browse… . Select the LGMDP installation directory and a list of NV Backup files(*.nv2) will be shown. These nv files were saved every time NV Backup option was selected, and the name of the nv file is determined based on the time when NV Backup was done. Choose the desired NV file to be downloaded on the handset, and click on Start.

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250

U250/KU250U250/KU250

U250/KU250U250/KU250

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LG Electronics U250 service manual 132

Contents

U250/KU250 Table Of Contents Page Regulatory Information PurposeElectrostatic Sensitive Devices PicturesInterference and Attenuation System Overview SpecificationRadio Performance Environment AccessoryTransmitter GSM Mode Usable environmentCase of DCS a 1710, B Case of PCS a 1850, B Power Tolerance Specification Transmitter Wcdma Mode3Receiver GSM Mode Receiver Wcdma Mode Level Change Current ConsumptionU250/KU250 Current Consumption Stand by Voice CallIndication Standby Battery BARCharging Test Item SpecificationSound Pressure Level General Description Block diagram of RF partTechnical Brief GSM Receiver GSM ModeAntenna Switch Module Control logic Technical Brief RTR6275 RX feature GSM Transmitter matching GSM TransmitterTransmitter Umts ModeReceiver RTR6275 IC functional block diagram Wcdma PAM U103 WS2512-TR1G LO generation and distribution circuitsOff-chip RF Components Front End Module control logic Vctcxo X100 DSA321SCE-19.2MFront-End Module U500 D5011 Usbotg Pmic Functional Block Diagram U300 PM6650-2MMSM6245 Interface PM6650 Block Diagram GSM PAM U101 SKY77318 GSM PAM SchematicUmts DuplexerFL104ACMD-7602 Umts Rx RF filter FL103 EFCH2140TDE1 Wcdma Rx SAW Filter SpecificationMSM6245 Bluetooth Baseband Bluetooth M100 LBRQ-2B43AGeneral Description Digital BasebandDBB/MSM6245RTR6275 PM6650512Mbit 76inch Block DiagramMSM6245Nand Flash ARM Microprocessor Subsystem Wcdma R99 featuresSubsystemMSM6245 Edge features GSM featuresGprs features MSM6245 microprocessor subsystem MSM6245 device audio processing featuresSupported interface features QtvTM Supported multimedia featuresVideo telephony services QvideophoneTM QcameraTMSummary of MSM6245 device features Description of RF configurations Vocoder Subsystem Mode Select and Jtag InterfacesStereo Wideband Codec USB General-Purpose Input/Output InterfaceUart 2. PM6650 Power BlockGeneral 12 PM6650 Functional Block Diagram Charging control 13 U250/KU250 Battery Bar DisplayStand By ConditionParameter Min Typ Max Unit Trickle Current 100 Trickle ChargingConstant Voltage Charging Constant Current ChargingTable#1. External memory interface External memory interfaceDQM30 512Mb64MB DATA310RTR6275WCDMATx, GSMTx/Rx 11 H/W Sub SystemRF Interface Others Table. Uart Interface MSM Sub SystemUsim Interface GPIOMap NameUSB Table. USB Signal InterfaceTable. Hkadc channel table HKADCHouse Keeping ADCTable. Key Matrix Mapping Table Key PadCamera Interface 21 Camera Socket Type ConnectorCAMDATAOUT3 Dvdd Keypad Light 22 Schematic of KEY back light circuit KEY sideDisplay & LCD FPC Interface LCD Module NM176CN1 Tovis24 Audio Interface Detailed DiagramMSM6245 Audio Signal Processing & Interface25 Audio part schematics MSM6245 Codec pinsMIC Audio AMP Audio part schematicsAudio Mode LG-U250/KU250 Main features Main FeaturesLogic Audio Bluetoot SW100 U101 U500 FL101 U100 FL104 U103 X100 Logic / Audio S300 U301RF Component Trouble ShootingUmts Signal Pathumts RF Signal Pathgsm RF Test Point of the VC-TCXO Block Schematic of the VC-TCXO BlockChecking VC-TCXO Block Check C312 of Pmic U300 Check R213 of MSM U201 Test Point of the Front-End Module Block Schematic of the Front-End Module BlockChecking Front-End Module Block Logic Table of the FEM Checking Tx level For testing, Max power of UMT 2100 is neededChecking Umts Block Trouble Shooting Checking Umts PAM Control Block PAM control signal TP2 TP4 Checking RF Rx LevelTrouble Shooting Checking GSM Block Checking RF Tx level Schematic of RF Tx levelTrouble Shooting TP1 TP4 TP2TP3 Checking PAM BlockTP1. DCS RX Input Checking RF Rx BlockTrouble Shooting Bluetooth Checking Bluetooth BlockChange the Main board Signals exits?Change the M100 Signals exits? StartPower on Troubleshooting Vregmsmc Vregmsme Vregmsmp Charger Charger TroubleshootingChange TA Or USB Cable Change the board Charger Troubleshooting FlowConnection OK? Charging part Main PCB Front Q302Q301 Q400 pin 4 is 5V? Check Q300 pin USB TroubleshootingGo to power on trouble shooting Cable is inserted? Insert cableEnd SIM Detect TroubleshootingStart Re-insert the SIM card YesUsim Yes Check the Cammclk Camera TroubleshootingStart Yes Camera is OK?Change the Main board 103 Yes104 C350 C447 U501U303C348 C349 Figure.Keypad backlight LED part 105 Keypad Backlight Troubleshooting106 Main LCD Troubleshooting107 Receiver Path108 109 Headset path110 111 Speaker phone path112 113 Main microphone114 115 Headset microphone116 117 VibratorWork well? Yes End 118 Introduction Downloading ProcedureU250/KU250 Download 120 Connecting to PC121 Keep All ContentsEraseEFS 122 Choosing image files123 124 125 Downloading126 127 128 Tools129 Troubleshooting Download Errors130 131 NV Restore Error132 133 Port numberGSM & Umts RF Block U250/KU250 RF Functional Block Diagram 134RF Block Component 135 RTR6275 & MSM6245 Interface Diagram 136 Interface Diagram1 RTR6275 & MSM6245 Interface Diagram Memory Interface Memory Interface Diagram 137USB, UART, SIM, Jtag Interface 138 3 USB,UART,SIM,JTAG Interface139 Main RF signal Control signal140 Placement Top Side141 Bottom Side142 143 Circuit DiagramNand & LCD 144EBI2WEN Nandready Nandale Nandcle Resoutn EBI2OEN 145146 LCD Connector147 148 149 Configuration of HOT KimchiConfiguration of directory 150 MSVCP60D.DLL MSVCRTD.DLL 151152 How to use HOT KimchiProcedure 153 154 Test Program Setting155 Wcdma Test Mode156 GSM Test Mode157 Exploded View & Replacement Part List158 159 Replacement Parts Mechanic component160 161 Replacement Parts Main component162 163 164 165 166 DUPLEXER,IMT 167168 169 170 RES,ARRAY,R 171Vctcxo 172173 174 Accessory