Instruction/ maintenance manual of the product U250 LG Electronics
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Date: June, 2007 / Issue 1.0 Service Manual Model : U250/KU250 Service Manual U250/KU250.
- 3 - 1. INTRODUCTION .............................. 5 1.1 Purpose................................................... 5 1.2 Regulatory Information............................ 5 2. PERFORMANCE ...............................7 2.1 System Overview ......
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- 5 - 1.1 Purpose This manual provides the information necessary to repair, calibration, description and download the features of this model. 1.2 Regulatory Information A.
E. Notice of Radiated Emissions This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory agencies. In accordance with these agencies, you may be required to provide information such as the following to the end user.
2. PERFORMANCE - 7 - 2.1 System Overview 2. PERFORMANCE Item Specification Shape GSM900/1800/1900 and WCDMA2100 - Bar type Handset Size 110.9 X 46.7 X 15.
2.2 Usable environment 1) Environment 2) Environment (Accessory) * CLA : 12 ~ 24 V(DC) 2.3 Radio Performance 1) T ransmitter - GSM Mode * In case of DCS : [A] -> 1710, [B] -> 1785 * In case of PCS : [A] -> 1850, [B] -> 1910 2. PERFORMANCE - 8 - Item Specification Voltage 3.
2. PERFORMANCE - 9 - * In case of DCS : [A] -> 1710, [B] -> 1785 * In case of PCS : [A] -> 1850, [B] -> 1910 No Item GSM DCS & PCS 30M ~ 1GHz -36dBm 30M~1GHz -36dBm MS allocated 1G~[A].
2. PERFORMANCE - 10 - No Item GSM DCS & PCS Frequency offset 800kHz 7 Intermodulation attenuation – Intermodulation product should be Less than 55dB below the level of Wanted signal Power contro.
2. PERFORMANCE - 11 - 2) T ransmitter - WCDMA Mode No Item Specification 1 Maximum Output Power Class 3 : +24dBm(+1/-3dB) 2F requency Error ±0.1ppm 3 Open Loop Power control in uplink ±9dB@normal, ±12dB@extreme Adjust output(TPC command) cmd 1dB 2dB 3dB +1 +0.
3)Receiver - GSM Mode 2. PERFORMANCE - 12 - No Item Specification 13 Adjacent Channel Leakage Ratio(ACLR) 33dB@5MHz, ACP>-50dBm 43dB@10MHz, ACP>-50dBm -36dBm@f=9~150KHz, 1K BW -36dBm@f=50KHz~30MHz, 10K BW -36dBm@f=30MHz~1000MHz, 100K BW 14 Spurious Emissions -30dBm@f=1~12.
2. PERFORMANCE - 13 - 4) Receiver - WCDMA Mode No Item Specification 1 Reference Sensitivity Level -106.7 dBm(3.84 MHz) -25dBm(3.84MHz) 2M aximum Input Level -44dBm/3.84MHz(DPCH_Ec) UE@+20dBm output power(Class3) 3 Adjacent Channel Selectivity (ACS) 33dB UE@+20dBm output power(Class3) -56dBm/3.
2. PERFORMANCE - 14 - 2.4 Current Consumption 1) U250/KU250 Current Consumption (Stand by and Voice Call Test Condition : Bluetooth off, LCD backlight off,Neighbor Cell off) (VT Test Condition : Speaker off, LCD backlight On) 2.5 RSSI BAR Stand by Voice Call VT WCDMA Under 2.
2.6 Battery BAR 2. PERFORMANCE - 15 - Indication Standby Bar 4 Over 3.83 ± 0.05V Bar 4 → 3 3.82 ± 0.05V Bar 3 → 2 3.73 ± 0.05V Bar 2 → 1 3.68 ± 0.05V Bar 1 → Empty 3.58 ± 0.05V Low Voltage, 3.58± 0.05V (Stand-by) / 3.58 ± 0.05V (Talk) Warning message+ Blinking [Interval : 3min(Stand-by) / 1min(Talk)] Power Off 3.
2. PERFORMANCE - 16 - 2.7 Sound Pressure Level 2.8 Charging • Charging Method : CC & CV (Constant Current and Constant Voltage) • Maximum Charging Voltage : 4.
3. TECHNICAL BRIEF - 17 - 3.1 General Description The U250/KU250 supports UMTS-2100, GSM-900, DCS-1800, and PCS-1900 based GSM/GPRS/UMTS. All receivers and the UMTS transmitter use the radio One 1 Zero-IF architecture to eliminate intermediate frequencies, directly converting signals between RF and baseband.
A generic, high-level functional block diagram of U250/KU250 is shown in Figure 1-1. One antenna collects base station forward link signals and radiates handset reverse link signals. The antenna connects with receive and transmit paths through a FEM(Front End Module).
3. TECHNICAL BRIEF - 19 - 3.2 GSM Mode 3.2.1 GSM Receiver The Dual-mode U250/KU250’s receiver functions are split among the three RFIC’s as follows: • GSM-900, DCS-1800, and PCS-1900 UMTS-2100 modes use the RTR6275 IC only.
The GSM900, DCS, and PCS receiver inputs of RTR6275 are connected directly to the transceiver front-end circuits(filters and antenna switch module). The GSM900, DCS, and PCS receiver inputs use differential configurations to improve common-mode rejection and second-order non-linearity performance.
3. TECHNICAL BRIEF - 21 - [Fig 1.2] RTR6275 RX feature.
3.2.2 GSM T ransmitter The RTR6275 transmitter outputs(DA_HB2_OUT and DA_LB1_OUT)include on-chip output matching inductors. The 50ohm output impedance is achieved by adding a series capacitor at the output pins.
3. TECHNICAL BRIEF - 23 - 3.3 UMTS Mode 3.3.1 Receiver The UMTS duplexer receiver output is routed to LNA circuits within the RTR6275 device. The UMTS Rx input is provided with an on-chip LNA that amplifies the signal before a second stage filter that provides differential downconverter.
3. TECHNICAL BRIEF - 24 - [Figure 1.4] RTR6275 IC functional block diagram WCDMA_2100_ TX WCDMA_2100_ RX.
3.4 LO generation and distribution circuits The integrated LO generation and distribution circuits are driven by internal VCOs to support various modes to yield highly flexible quadrature LO outputs t.
3.5.2 VCTCXO (X100 : DSA321SCE-19.2M) The Voltage Controlled Temperature Compensated Crystal Oscillator (VCTCXO) provides the reference frequency for all RFIC synthesizers as well as clock generation functions within the MSM6245 IC. The oscillator frequency is controlled by the MSM6245 IC.
3. TECHNICAL BRIEF - 27 - 3.5.4 PMIC Functional Block Diagram (U300 : PM6650-2M) • Input power management - Valid external supply attachment and removal detection - Supports unregulated (closed-loop.
• Integrated handset-level user interfaces - Four programmable current sinks recommended as keypad backlight, LCD backlight, camera flash, and general-purpose drivers - Vibration motor driver programmable from 1.
3. TECHNICAL BRIEF - 29 - [Figure1.7] PM6650 Block Diagram.
3.5.5 GSM P AM (U101 : SKY77318) The SKY77318 is an extremely small (6 x 6 mm), GSM PAM for handset applications. This module has been optimized for excellent efficiency and Pout while maintaining high GSM/GPRS efficiency. The small size and high performance is achieved with high-reliability GaAs HBT technology.
3. TECHNICAL BRIEF - 31 - 3.5.6 UMTS Duplexer(FL104:ACMD-7602) A UMTS duplexer splits a single operating band into receive and transmit paths. Important performance requirements include; • Insertion loss. this component is also in the receive and transmit paths ; In the U250/KU250 typical losses : UMTS2100_ Tx = 1.
3.5.7 UMTS Rx RF filter (FL103 : EFCH2140TDE1) • Frequency range : 2110 ~ 2170MHz An RF filter is located between the UMTS LNA and mixer. Insertion loss is important, but not as critical as losses before the LNA.
3. TECHNICAL BRIEF - 33 - 3.5.8 Bluetooth (M100 : LBRQ-2B43A) The MSM6245 includes BT baseband embedded BT 1.1 compliant baseband core, so the other bluetooth components are an bluetooth RF module and Antenna. Figure1.9 shows the bluetooth system architecture in the U250/KU250.
3.6 Digital Baseband(DBB/MSM6245) 3.6.1 General Description A. Features(MSM6245) • Support for multimode operation - tri-band WCDMA (UMTS), quad-band GSM/GPRS/EDGE • Support for WCDMA (UMTS) uplin.
3. TECHNICAL BRIEF - 35 - Front E nd Module Duplexer RTR6275 WCDMA PAM MSM6245 WCDMA TX SAW WCDMA RX SAW PM6650 -2M GSM PAM GSM TX SAW COUPLER VCTCXO Bluetooth RF Module U-SIM 1.
3. TECHNICAL BRIEF - 36 - 3.7 Block Diagram(MSM6245) MSM6245 CONNECTIVITY CAMERA PROCESSING (Def ault 8bit Interface) GRAPHICS VIDEO AUDIO DUAL MEMORY BUS Modem QDSP 4000 PLL QD SP 4000 ARM 926ejs With Jazelle UMTS, WCDMA BT 1.2 pro cessor Rx ADC Tx DAC MP3, AAC, EVRC, QCELP AMR, CMX, MI DI EBI 1 EBI 2 Open GL ES 3D, 2D MPEG-4 H.
3. TECHNICAL BRIEF - 37 - 3.8 Subsystem(MSM6245) 3.8.1. ARM Microprocessor Subsystem The MSM6245 device uses an embedded ARM926EJ-S microprocessor. This microprocessor, through the system software, controls most of the functionality for the MSM, including control of the external peripherals such as the keypad, LCD, RAM, ROM, and EEPROM devices.
3. TECHNICAL BRIEF - 38 - 3.8.3. GSM features The following GSM modes and data rates are supported by the MSM6245 device hardware. Support modes conform to release '99 specifications of the sub-feature. ■ Voice features ❏ FR ❏ EFR ❏ AMR ❏ HR ❏ A5/1, A5/2, and A5/3 ciphering ■ Circuit-switched data features ❏ 9.
3. TECHNICAL BRIEF - 39 - 3.8.6. MSM6245 device audio processing features ■ Integrated wideband stereo CODEC ❏ 16-bit DAC with typical 88 dB dynamic range ❏ Supports sampling rates up to 48 kHz .
3. TECHNICAL BRIEF - 40 - 3.8.9. Supported multimedia features ■ Provide additional general purpose MIPS by using: ❏ Two QDSP4000s ❏ Dedicated hardware accelerators and compression engines ■ I.
3. TECHNICAL BRIEF - 41 - ■ PNG decoder ■ Pitch bend range support ■ LED/vibrate support ■ Scalable Vector Graphics (SVG- Tiny 1.1 + SVG Tiny 1.2) ■ MLZ decoder ■ Integrated PNG/SAF A.T. Note: 1. At this time, only 32-bit SDRAM is supported on the MSM6245 device.
3. TECHNICAL BRIEF - 42 - Table 1-2 Description of RF configurations.
3. TECHNICAL BRIEF - 43 - 3.8.10. Stereo Wideband CODEC The MSM6245 device integrates a wideband voice/audio CODEC into the mobile station modem (MSM). The CODEC supports two differential microphone inputs, one differential earphone output, one single-ended earphone output, and a differential analog auxiliary interface.
3. TECHNICAL BRIEF - 44 - 3.8.14. General-Purpose Input/Output Interface The MSM62450 device has general-purpose bidirectional input/output pins. Some of the GPIO pins have alternate functions supported on them.
3. TECHNICAL BRIEF - 45 - 3.9 Power Block 3.9.1. General MSM6245, included RF, is fully covered by PM6650(Qualcomm PMIC). PM6650 cover the power of MSM6245, MSM memory, RF block, Bluetooth, USIM and TCXO. Major power components are : 3.9.2. PM6650 The PM6650 device (Figure 1-1) integrates all wireless handset power management.
3. TECHNICAL BRIEF - 46 - Figure 1.12 PM6650 Functional Block Diagram.
3. TECHNICAL BRIEF - 47 - 3.9.3. Charging control A programmable charging block in PM6650 is used for battery charging. It is possible to set limits for the charging current.
T rickle Charging Trickle Charging of the main battery, enabled through SBI control and powered from V DD , is provided by the PM6650 IC, The trickle charger is on-chip programmable current source that supplies current from V DD to pin (VBAT).
3. TECHNICAL BRIEF - 49 - Constant Current Charging The PM6650 IC supports constant current charging of the main battery by controlling the charger pass transistor and the battery transistor. The constant current charging continues until the battery reaches its target voltage, 4.
3.10 External memory interface The MSM6245 device was designed to provide two distinct memory interfaces. EBI1 was targeted for supporting high speed synchronous memory devices. EBI2 was targeted towards supporting slower asynchronous devices such as LCD, NAND flash, SDRAM, etc.
3. TECHNICAL BRIEF - 51 - MSM6245 SDRAM 512Mb NAND 512Mb (64MB) DATA[31:0] ADDRESS[14 : 0] WE* CS* CAS* RAS* CLK_EN CLK DQM[3:0] NAND_CS* NAND_RE* NAND_WE* NAND_CLE NAND_WP* NAND_ALE NAND_READY DATA[7:0] EBI1 EBI2 Figure 1.
3.1 1 H/W Sub System 3.1 1.1. RF Interface A. RTR6275(WCDMA_Tx, GSM_Tx/Rx) MSM6245 controls RF part(RTR6275) using these signals. • SBST : SSBI I/F signals for control Sub-chipset • PA_ON1 : Power.
3. TECHNICAL BRIEF - 53 - B. the others • TRK_LO_ADJ : TCXO(19.2M) Control • PA_ON : WCDMA(2100) TX Power Amp Enable • ANT_SEL[0-2] : Ant Switch Module Mode Selection(WCDMA,GSM Tx/Rx,DCS-PCS Tx/.
3.1 1.2. MSM Sub System 3.11.2.1. USIM Interface SIM interface scheme is shown in Figure. And, there control signals are followed • USIM_CLK : USIM Clock • USIM_Reset : USIM Reset • USIM_Data : USIM Data T/Rx 3.11.2.2. UART Interface UART signals are connected to MSM GPIO through IO connector with 115200 bps speed.
3. TECHNICAL BRIEF - 55 - 3.11.2.3. USB The MSM6245 device contains a Universal Serial Bus (USB) interface to provide an efficient interconnect between the mobile phone and a personal computer (PC). The USB interface of the MSM6245 was designed to comply with the definition of a peripheral as specified in USB Specification, Revision 1.
3.1 1.3 HKADC(House Keeping ADC) The MSM6245 device has an on-chip 8-bit analog-to-digital converter (HKADC) which is tended to digitize DC signals corresponding to analog parameters such as battery voltage, temperature, and RF power levels. The MSM6245 device has six analog input pins which are multiplexed to the input of the internal HKADC.
3. TECHNICAL BRIEF - 57 - 3.1 1.4. Key Pad There are 23 main key buttons in Figure. Shows the Keypad circuit. ‘END’ Key is connected to PMIC(PM6650).
3.1 1.5 Camera Interface U250/KU250 Installed a 1.3M Pixel and 0.3Mega Camera. Below figure shows the camera socket type connector and camera I/F signal. 3. TECHNICAL BRIEF - 58 - Figure 1.21 Camera Socket Type Connector VT_CAMERA_CONNECTOR REV_1.0 REV_1.
3. TECHNICAL BRIEF - 59 - The MEGA Camera module is connected to socket type connector with 24 pin (F95M08). Its interface is dedicated camera interface port in MSM6245.
3. TECHNICAL BRIEF - 60 - The VGA Camera module is connected to socket type connector with 20 pin (CLE9120-2761E). Its interface is dedicated camera interface port in MSM6245. The camera port supply 24.576MHz master clock to camera module and receive 12.
3. TECHNICAL BRIEF - 61 - 3.1 1.6 Keypad Light There are 8 Blue LEDs in Main key backlight circuit, which are driven by KYDB_BACKLIGHT line from PM6650.
3. TECHNICAL BRIEF - 62 - 3.1 1.7. LCD Module (NM176CN1 : T ovis) - The NM176CN1 model is a Color TFT Main supplied by Tovis. This LCD Module has a 1.76 inch diagonally measured active display area with 176(RGB)X220 resolution. each pixel is divided into Red, Green and Blue sub-pixels and dots which are arranged in vertical stripes.
3. TECHNICAL BRIEF - 63 - 3.1 1.8.1. Audio Signal Processing & Interface Audio signal processing is divided uplink path and downlink path. The uplink path amplifies the audio signal from MIC and converts this analog signal to digital signal and then transmits it to DBB Chip (MSM6245).
3. TECHNICAL BRIEF - 64 - MSM6245 CODEC pins MSM pin W18 (CODEC VSS) AUDIO Place near Near to MSM 10% C201 47p F25 SDCC_DAT1_GPIO99 SDCC_DAT2_GPIO100 M25 M26 AF20 MIC1N AE20 MIC1P MIC2N AF21 AF22 MIC2.
3. TECHNICAL BRIEF - 65 - REV_B AUDIO SELECT_SPK&RCV R422 10 R421 10 VA412 EVL14K02200 VA414 EVL14K02200 3 COM1 9 COM2 6 GND IN1 4 IN2 8 5 NC1 NC2 7 NO1 2 NO2 10 1 VCC U401 NLAS5223BMNR2G 0.
3. TECHNICAL BRIEF - 66 - Audio part schematics REV_C : 20K --> 3K Audio AMP REV_E : For Antenna Radiation 5.6K R430 C423 C428 1u 0.1u R427 1K R429 1K C431 NA C422 0.1u 2 4 INM INP 3 OUTA 5 8 OUTB VM 7 VP 6 1 _SD NCP2890DMR2 U402 BYPASS 5600p C426 RCVP 10u C425 C429 1000p R428 5.
3. TECHNICAL BRIEF - 67 - 3.1 1.8.2. Audio Mode There are three audio modes (Voice call, speaker phone, MIDI/MP3). Audio & Sound Main Component There are 6 main components in U250/KU250.
3. TECHNICAL BRIEF - 68 - 3.12 Main Features 1. LG-U250/KU250 Main features - Bar Type - WCDMA(2100) + GSM Tri-Band (900/1800/1900) - Color LCD (Main:262K TFT, 1.
3. TECHNICAL BRIEF - 69 - 2. U250/KU250 Main Component Main board (Bottom) Main board (Top) Logic /A udio RF Bluetoot h Logic.
3. TECHNICAL BRIEF - 70 - RF U101 X100 SW100 FL101 U103 U100 FL104 U500 Reference Description Reference Description SW100 Ant. Switch module FL104 W2100 Duplex U500 Front End module U103 WCDMA PAM U10.
3. TECHNICAL BRIEF - 71 - Logic / Audio Reference Description Reference Description BAT300 Backup Battery CN401 MMI connector (18pin) U303 1.3M Cam. LDO CN403 1.
3. TECHNICAL BRIEF - 72 - Logic U201 U301 U300 J300 CN400 S300 Reference Description Reference Description U201 MSM6245_A U300 PMIC U301 Memory MCP J300 U-SIM socket CN400 Main To LCD Connector S300 T.
4. TROUBLE SHOOTING - 73 - 4.1 RF Component 4. TROUBLE SHOOTING LGMC.
4. TROUBLE SHOOTING - 74 - Block Diagram Block Ref. Name UMTS Part Name Function Comment.
4. TROUBLE SHOOTING - 75 - 4.2 SIGNAL P A TH_UMTS RF Common Tx/Rx UMTX 2100 Tx/Rx UMTX 2100 Tx UMTX 2100 Rx Tx I/Q LO RX I/Q.
4.3 SIGNAL P A TH_GSM RF 4. TROUBLE SHOOTING - 76 - Common Tx/Rx GSM9 00 Tx PCS Rx Tx I/Q LO RX I/Q DCS/PCS Tx EGSM900 RX DCS RX.
4. TROUBLE SHOOTING - 77 - 4.4 Checking VC-TCXO Block The reference frequency (19.2MHz) from X100 (VC-TCXO) is used in UMTS TX part, GSM part and BB part. TCXO 24 VCC 5 TC7SH04FU U104 GND 3 100p C185 0.1u C181 R124 100ohm 1000p C182 R128 100K C183 0.01u 1000p C186 DSA321SCE-19.
4. TROUBLE SHOOTING - 78 - Check C312 of PMIC (U30 0) Check R213 o f MSM (U20 1) T.
4. TROUBLE SHOOTING - 79 - 4.5 Checking Front-End Module Block Rev.D Rev.B Rev.C R101 1K R100 1K L108 15nH C117 10p C110 33p 21 14 GSM18001900_TX GSM1800_RX1 1 GSM1800_RX2 2 GSM1900_RX1 3 4 GSM1900_RX.
4. TROUBLE SHOOTING - 80 - Logic T able of the FEM TP 1 VREG RF SMPS GSM 1800 / GSM1900 RX GSM 900 RX GSM 900 TX / WCDMA GSM 1800 / GSM 1900 TX.
4. TROUBLE SHOOTING - 81 - 4.6 Checking UMTS Block 4.6.1 Checking Tx level TP1 TP2 TP3 TP4 Rev.D 1p C437 ANT101 NA L101 56p C101 ANT G1 G2 RF SW100 KMS-507 100nH L102 ANT102 C450 22p 11 U500 C102 NA 20dB Rev_1.
4. TROUBLE SHOOTING - 82 -.
4. TROUBLE SHOOTING - 83 - 4.6.2 Checking UMTS P AM Control Block • P AM control signal 1. PWR_DET : UMTS Tx Power Detected value (Check R120) 2. TX_AGC_ADJ : UMTS RTR6275 Tx Amp Gain Control 3. VREG_TCXO_2.85V : UMTS PAM enable (C170) (about 2.85V) 4.
4. TROUBLE SHOOTING - 84 - 4.6.3 Checking RF Rx Level TP1 TP2 TP4 TP3 Vbias RD 1p C437 ANT101 NA L101 56p C101 ANT G1 G2 RF SW100 KMS-507 100nH L102 ANT102 C450 22p U500 C102 NA Rev.D 20dB Rev_1.0 Rev.B Rev.D Rev_1.0 Rev.D Rev.D WCDMA 7dB L410 4.7nH 0.
4. TROUBLE SHOOTING - 85 -.
4. TROUBLE SHOOTING - 86 - 4.7 Checking GSM Block 1 3 2.
4. TROUBLE SHOOTING - 87 - 4.7.1 Checking RF Tx level 4.7.2 Schematic of RF Tx level TP1 TP2 TP3 Rev.D Rev.D Rev.C R101 1K 10nH L116 R100 1K 100p C438 C124 100p 5.6p C441 L108 15nH 1.5nH L403 L115 18nH 100ohm R107 C123 0.01u C117 10p 56p C101 68p C139 C137 NA ANT G1 G2 RF SW100 KMS-507 C134 0.
4.7.3 Checking RF Tx level 4. TROUBLE SHOOTING - 88 -.
4. TROUBLE SHOOTING - 89 - 4.7.4 Checking P AM Block TP1. GSM_P A_RAMP : Power Amp Gain Control. typically , 0.2V < Vramp < 1.6V TP2. GSM_P A_EN : Power Amp Enable (Power ON : higher than 1.25V , Power OFF : lower than 0.4V) TP3. GSM_P A_BAND : Power Amp Band Selection Control (GSM Mode : -0.
4.7.5 Checking RF Rx Block Schematic of GSM900/DCS/PCS Rx Block 4. TROUBLE SHOOTING - 90 - TP1. DCS RX INPUT TP2. PCS RX INPUT TP3. GSM RX INPUT TP1 TP2 TP3 Rev.C Rev.D EGSM DCS Rev.C PCS R101 1K NA C191 C442 5.6p 10nH 5p L116 R100 1K C440 L406 2.7nH C124 100p NA C120 0.
4. TROUBLE SHOOTING - 91 -.
4.8 Checking Bluetooth Block T est Point of the Bluetooth Block T est Point of the Bluetooth Block Schematic of the Bluetooth Block 4. TROUBLE SHOOTING - 92 - TP1.
4. TROUBLE SHOOTING - 93 - Start TP1,TP2 Si gnals exit s? TP3 Is clock ok? 19.2 M TP4 Si gnals exit s? Change the Main board Change the M100 NO YES YES YES NO Change the X100 NO Change the Main board.
4.9 Power ON T roubleshooting Power On sequence of U250/KU250 is : PWR key press → PM_ON_SW_N go to low, PM6650 KPDPWR_N (pin24) → PM6650 Power Up → VREG_MSMC_1.2V, VREG_MSME_1.8V, VREG_MSMP_2.7V, VREG_MSMA_2.6V, VREG_TCXO_2.85V power up and system reset assert to MSM6245 → Phone booting and PS_HOLD assert to PMIC 4.
4. TROUBLE SHOOTING - 95 - VREG_MSMP VREG_MSMA VREG_MSME VREG_MSMC X300 : 32.768Khz R306 : 19.2Mhz [U250/KU250 Main PCB BOTTOM].
4. TROUBLE SHOOTING - 96 - 4.10 Charger T roubleshooting Charging Procedure - Connect TA or USB Cable - Control the charging current by PM6650 IC - Charging current flows into the battery Troubleshoot.
4. TROUBLE SHOOTING - 97 - [ Charger Troubleshooting Flow ] Start Check the pin and battery Connect terminals of I/O connector Connection OK? Change I/O connector Is the TA (or USB Cable) voltage 5.
4. TROUBLE SHOOTING - 98 - R313 Q 301 Q 302 Q 300 [ Charging part ( Main PCB Front ) ].
4. TROUBLE SHOOTING - 99 - 4. BB T rouble Shooting 4.1 1 USB T roubleshooting USB Initial sequence of U250/KU250 is : USB connected to U250/KU250 power on → USB_VBUS(Q300) go to 5V → USB_D+ go to 3.3V → USB_DAT is triggered → USB work. Start Q400 pi n 4 is 5 V? USB_D+ i s 3.
4. TROUBLE SHOOTING - 100 - 4.12 SIM Detect T roubleshooting USIM Initial sequence of U250/KU250 is : USIM_CLK,USIM_RST,USIM_DATA triggered → VREG_UIM_2.
4. TROUBLE SHOOTING - 101 - 1 VREG_USI M_2.85V 2 USIM_P_RST_ N USIM_P_CLK 3 7 USIM_P_DAT A 1 2 3 7 6 5 USIM VA302 EVLC18S02003 VA301 EVL14K02200 C353 0.1u smd_1005h_5_r C352 smd_1005h_5_r 33p R317 15K EVLC18S02003 VA300 6 CLK 3 5 GND1 GND2 9 10 GND3 GND4 12 11 GND5 IO 7 2 RST 4 RSV1 8 RSV2 1 VCC VPP J300 HSSC-8P-18 L302 56nH VREG_USIM_2.
4. TROUBLE SHOOTING - 102 - 4.13 Camera T roubleshooting Camera control signals are generated by MSM6245. 4.13.1 MEGA CAMERA Start Yes NO END Ca mera is OK? Check the camera connector and reconnect th.
4. TROUBLE SHOOTING - 103 - 4.13.2 VGA CAMERA Start Yes NO END Ca mera is OK? Check the camera connector and reconnect the camera Change the Ma in board Ca mera is OK Check the CAM_MCLK Change the cam.
4. TROUBLE SHOOTING - 104 - C349 U303 U501 C348 C347 C350 C447 CAMERA LDO REV_D 6 BGND 2 GND NC 5 STBY 1 3 VIN VOUT 4 BH15LB1WHFV U501 1u C348 1u C447 C349 1u 1u C350 NC2 6 9 PGND VIN 18 VOUT1 VOUT2 7 RT9011-MGPQW U303 2 EN1 3 EN2 5 GND NC1 4 1u C347 VREG_CAM_DVDD_1.
4. TROUBLE SHOOTING - 105 - 4.14 Keypad Backlight T roubleshooting Key Pad Back Light is on as below : Key pressing → KYBD_BACKLIGHT go to 0V → MAIN Key Backlight LED On Figure.Keypad backlight LED part Start Change the Main boa rd Check battery NO Yes Yes Key press Change the Main boa rd Yes NO +VPWR is abo ve 3.
4. TROUBLE SHOOTING - 106 - 4.15 Main LCD T roubleshooting Main LCD control signals are generated by MSM6245. The signal path is : MSM6245 → CN400 → LCD Module Start GO to power on trouble s hooti.
4. TROUBLE SHOOTING - 107 - 4.16 Receiver Path MSM6245 EAR1ON/EAR1OP → R421,R422 → Analog Switch(U401) → Receiver Start Connect the phone to network Equipment and setu p call Setup 1KHz tone out.
4. TROUBLE SHOOTING - 108 - R422 R421 U401.
4. TROUBLE SHOOTING - 109 - 4.17 Headset path MSM6245 HPH_R, HPH_L → C402/C401 → R407/R406 → CN401 (MMI Connector) Start Connect the phone to network equipment and s etup call.
4. TROUBLE SHOOTING - 110 - C401 C402 R406 C407 CN401.
4. TROUBLE SHOOTING - 111 - 4.18 Speaker phone path MSM6245 LINE_P,LINE_N → R429/R427, C423/C422, R431/R426 → Audio AMP(U402) → Analog Switch(U401) → Speaker Start Connect the phone to network equipment and s etup call Setup 1KHz tone out Sine wave appear s at R 429/R427 and C 423/C422 Ch ange the Main b oard NO SPK_AMP_EN is 2.
4. TROUBLE SHOOTING - 112 - Analog Switch Audio Amp SPK+.
4. TROUBLE SHOOTING - 113 - 4.19 Main microphone MIC400 → MIC1P, MIC1N (MSM6245) Start MI C_BIAS(C416) is 1.8V Change main board NO M ake a call Change the MIC NO YES Ch ange the Main b oard M ake s.
4. TROUBLE SHOOTING - 114 - MIC400 C417 R424.
4. TROUBLE SHOOTING - 115 - 4.20 Headset microphone Headset → C210/C211 → MIC2P, MIC2N (MSM6245) Start H OOK _KEY is detected? Yes END M ake a call Change the MAIN board MICBIAS is biased by 1.
4. TROUBLE SHOOTING - 116 - Ear_Sense_N MIC Input.
4. TROUBLE SHOOTING - 117 - 4.21 V ibrator The Vibrator is connected between +VPWR and VIB_DRV_N (PM6650 25 pin). The Vibrator motor driver is an SBI-programmable voltage out that is reference to +VPWR.
4. TROUBLE SHOOTING - 118 - +VPW R MOTOR_PWR-.
5. DOWNLOAD - 119 - 5.1 U250/KU250 DOWNLOAD 5.1.1 Introduction LGMDP is a LGE application that allow users to download images from PC to handset. LGMDP is a download tool with capabilities to upload image files to the handset. LGMDP is designed to be simple to use and easy enough for the beginner to upload executable images to the handset.
5. DOWNLOAD - 120 - 5.1.2.1 Connecting to PC • Click on the Select Port and then Select Port window will be pop up. Check if state shows Enable for the port to be connected for downloading images. Then click on the Connect button. (The port number(COM7) shall be different from that of the port number in the snapshot.
5. DOWNLOAD - 121 - 1) Image Folder indicates loot path where all image files are placed. To change location of the default image path, select Browse… button. The edit box shows the file path where images are located. Please note that all images should be located in a selected folder.
5.1.2.2 Choosing image files • Select the image folder, where all the image files are located, by clicking on the Browse…. (The folder name shall be different from that of the folder name in the snapshot. The folder name indicates the path where the image files are located.
5. DOWNLOAD - 123 - • Select the path on the Image Folder by clicking on the Browse..., then the LGMDP will automatically load images accordingly. Also you can select images by manually. For instance, select the path of AMSS Modem Image file by clicking on the Browse… button.
• If NV restore is failed, then the NV Data(*.nv2) is erased permanently. In this case, choose the desired NV file to be downloaded on the handset. To enable this simply check the box or select the NV file from the LGMDP installation directory by clicking on the Browse… button.
5. DOWNLOAD - 125 - • This message box informs that a new file for NV backup will be created in the displayed file name in the LGMDP installation directory. • Backing up NV data and backed up NV data will be stored in the LGMDP installation directory.
5. DOWNLOAD - 126 - • Rebooting the handset and re-establishing the connection • Restoring NV data which backed up in the Backing up process. User can also restore NV data using NV Default image selection.
5. DOWNLOAD - 127 - • Downloading Media image in progress • Downloading Module image in progress • Downloading process has completed successfully U250/KU250 U250/KU250 U250/KU250.
5. DOWNLOAD - 128 - 5.1.2.4 T ools • Device Manager allows to monitor current hardware that is installed on your PC. Device Manager is designed to monitor USB connectivity and check where the COM has been installed . Select Device Manager from the Tools of the file menu.
5. DOWNLOAD - 129 - 5.1.3 T roubleshooting Download Errors 1) When the phone does not work after downloading has been completed. 2) Media Erasing Error 3) NV Restore Error 5.1.3.1 When the phone does not work • Reboot the phone in the emergency mode (Simultaneously press 2, 5, and PWR red keys) and then try to download all the images up to AMSS.
5. DOWNLOAD - 130 - • The below dialog shows parameters of Select Port when phone is booted in Emergency mode. Click on the Connect button to continue. • Choose Image file after clicking on the Browse… button. Make sure that you have chosen the right image file.
5. DOWNLOAD - 131 - 5.1.3.2 NV Restore Error • Snapshot showing the NV Restore error. Next slide shows the remedial procedure to adopt. • Connect the handset and Press the Connect button in the Select Port window. (Enable state in the window indicates that the Phone has been detected and is ready to download.
5. DOWNLOAD - 132 - • 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.
5. DOWNLOAD - 133 - 5.1.4 Caution 1) Multi-downloading using the USB hub is not recommendable. 2) If you see the message ‘cal mode’ after ‘completing download’, you must do NV restore and image (media and module) download. 3) The NV data saved at LGMDP folder as following format.
6. BLOCK DIAGRAM - 134 - 6.1 GSM & UMTS RF Block 6. BLOCK DIAGRAM [Fig 2.1] U250/KU250 RF Functional Block Diagram.
6. BLOCK DIAGRAM - 135 - [Table 2.1] RF Block Component.
6. BLOCK DIAGRAM - 136 - 6.2 Interface Diagram 6.2.1 RTR6275 & MSM6245 Interface Diagram [Fig 2.2] RTR6275 & MSM6245 Interface Diagram.
6. BLOCK DIAGRAM - 137 - 6.2.2 Memory Interface [Fig 2.3] Memory Interface Diagram ADDRESS[14:0].
6. BLOCK DIAGRAM - 138 - 6.2.3 USB,UART ,SIM,JT AG Interface [Fig 2.4] USB, UART, SIM, JTAG Interface.
6. BLOCK DIAGRAM - 139 - Main RF signal Control signal Control signal Description Comment UM TS P A _CTL signal PA _ R 0 UMTS Tx High/Low Power Control GSM P A_CTL signal GS M_ PA _B AND DCS or PCS /G.
6. BLOCK DIAGRAM - 140 - 6.2.4 Placement *T op Side LGMC.
6. BLOCK DIAGRAM - 141 - *Bottom Side LGMC.
- 142 -.
- 143 - LGMC Sign & Name Sheets Checked Sheet/ Approved Rev.D 1 2 GSM 1800/GSM 1900 TX HIGH F E LOW Rev.D Date BLUETOOTH REV_1.2 Rev.D 5 GSM_PA_BAND D 14 MODE F DRAWING GSM/EDGE 9 20dB 8.86dB D C Designer 4 GSM 1800/GSM 1900 RX TCXO VTUNE-Connected directly to GND A 6 LG Electronics Inc.
- 144 - LGMC VBAT PWR URXD UTXD 3G 2.5G GND RX TX UFLS ON_SW 150K : 470K : 1.97V Sheets 16-bit, NAND, Trusted Native, ARM JTAG MSM pin W18 DRAWING NAME A KEYPAD Designer 10 E 6 BOOT_MODE3 BOOT_MODE2 BOOT_MODE1 150K : 300K : 1.73V PMIC_AUXIN[1] 9 Checked (CODEC VSS) 14 D12(VDDA1) and F12(DAC_REF) NO.
- 145 - LGMC NAME VDD_RF : 0.1uF A 3 2 6 1608 4 13 VDD_ANA : 0.1uF 7 VDD_MSMC : 4.7uF E 9 MCP(512Mb NAND + 512Mb 1 piece SDRAM) 5 15 Draw the Artwork_line thickly !!!!! REV_B 1 C 1608 --->> USB_VBUS , FLASH_DRV_N , KPD_DRV_N , KEY_ON_SW_N , MOT_PWR- LCD LDO D VDD_MAIN : 0.
- 146 - LGMC D REV_B : EDTY0008606 --> EDTY0008601 LG Electronics Inc. VT_CAMERA_CONNECTOR REV_B F Sheet/ 2 5 1 B E MIC Sign & Name 15 DRAWING 7 HOT3 A 7 D MODEL 4 REV_1.
- 147 - LGMC 8. PCB LA YOUT U250/KU250.
- 148 - LGMC 8. PCB LA YOUT U250/KU250.
9. Calibration & RF Auto T est Program (Hot Kimchi) - 149 - 9. Calibration & RF Auto T est Program (Hot Kimchi) 9.1 Configuration of HOT KIMCHI 9.1.1 Configuration of directory Cm_Grut Debug Common d ll_serialat Log LG_CL_009.dll Auto Cal CalAuto : Dir ectory : File C: At_Serial_Cmd.
9. Calibration & RF Auto T est Program (Hot Kimchi) - 150 - Hot_Kimchi M odel Debug KU250 : Dir ectory : File image Log Log AutoSetup_110.xml Cal_Setup_Test.xml Ezlooks.xml LG_RfCal_Q3G6280N _Polar_006.d ll Procedure_KU250_103.xml script_auto_001.
9. Calibration & RF Auto T est Program (Hot Kimchi) - 151 - Result UI Auto image : Dir ectory : File Cal CalAuto result.bmp LG_UI_Ad6500_002.dll KU250 KU250 KU250 LG_UI_EmKU250_001.dll LG_UI_Qu6250_003.dll LG_UI_Qu6275_004.dll dll,ocx MFCO42D.DLL MSVCP60D.
9. Calibration & RF Auto T est Program (Hot Kimchi) - 152 - 9.2 How to use HOT KIMCHI * Procedure 1. Click “Logic Operation” of “SETTING” menu bar 2.
9. Calibration & RF Auto T est Program (Hot Kimchi) - 153 - * Procedure 4. Select the model name “U250/KU250” 5. Click “Start” button KU 250 Select "U250/KU250" Click "Star .
10. Factory T est Mode - 154 - 10.1. T est Program Setting 1) Open “LG FTM GUI” 2) Click “Options >> Port Settings” 3) Select Com Port and click “OK” 10.
10. Factory T est Mode - 155 - 10.2. WCDMA T est Mode 1) Click “T ools >> FTM GUI WCDMA” 2) Select “FTM” Mode 3) Select RF Frequencies, insert “9750” in “Uplink chan” and push “Enter”. Then “2140” is written at Rx UHF automatically .
10. Factory T est Mode - 156 - 10.3. GSM T est Mode 1) T o switch GSM Mode, Select Mode -> GSM mode at menu commands 2) Select RF Mode, Click “GSM” or “GSM1800” or “GSM1900” 3) Write wanted channel. W e usually set “1” 4) For Deciding to “P A DAC V alue”, insert 14300 as a maximum value 5) Click “Tx On” or “Tx Off”.
- 157 - 1 2 3 4 5 6 7 8 12 13 15 16 17 18 19 20 22 28 29 30 31 32 35 34 33 36 23 24 25 26 27 37 14 11 10 9 1 1. EXPLODED VIEW & REPLACEMENT P ART LIST 1 1.
- 158 -.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 159 - 1 1.2 Replacement Parts <Mechanic component> Note: This Chapter is used for reference, Part order is ordered by SBOM standard on GCSC Level Location No.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 160 - Level Location No. Description Part Number Spec Color Remark 4 MTAB01 TAPE,PROTECTION MTAB0178301 COMPLEX, (empty), , , , , Without Color 32 4 MTAD00 TAPE,WINDOW MTAD0065901 COMPLEX, (empty), 0.2, , , , Without Color 30 4 MWAE00 WINDOW,CAMERA MWAE0024501 COMPLEX, (empty), 1.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 161 - Level Location No. Description Part Number Spec Color Remark 3 GMEY00 SCREW MACHINE,BIND GMEY0011201 1.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 162 - Level Location No. Description Part Number Spec Color Remark 6 C123 CAP,CERAMIC,CHIP ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP 6 C124 CAP,CHIP,MA.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 163 - Level Location No. Description Part Number Spec Color Remark 6 C173 CAP,CERAMIC,CHIP ECCH0000198 2.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 164 - Level Location No. Description Part Number Spec Color Remark 6 C222 CAP,CERAMIC,CHIP ECCH0000143 1 nF,50V,K,X7R,HD,1005,R/TP 6 C223 CAP,CERAMIC,.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 165 - Level Location No. Description Part Number Spec Color Remark 6 C319 CAP,CHIP,MAKER ECZH0004402 0.1 uF,16V ,Z ,NP0 ,TC ,1005 ,R/TP 6 C320 CAP,CHIP,MAKER ECZH0004402 0.1 uF,16V ,Z ,NP0 ,TC ,1005 ,R/TP 6 C321 CAP,CHIP,MAKER ECZH0004402 0.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 166 - Level Location No. Description Part Number Spec Color Remark 6 C357 CAP,CHIP,MAKER ECZH0001215 1 uF,10V ,K ,X5R ,TC ,1005 ,R/TP 6 C358 CAP,CERAMIC,CHIP ECCH0000393 22 uF,6.3V ,M ,X5R ,HD ,2012 ,R/TP 6 C389 CAP,CERAMIC,CHIP ECCH0006201 4.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 167 - Level Location No. Description Part Number Spec Color Remark 6 C436 CAP,CERAMIC,CHIP ECCH0005604 10 uF,6.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 168 - Level Location No. Description Part Number Spec Color Remark 6 FL405 FILTER,EMI/POWER SFEY0007103 SMD ,18 V, ,SMD ,4ch. R-Varistor Array(50Ohm,15pF), Pb-free 6 FL406 FILTER,EMI/POWER SFEY0007103 SMD ,18 V, ,SMD ,4ch.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 169 - Level Location No. Description Part Number Spec Color Remark 6 Q301 TR,FET,P-CHANNEL EQFP0004701 TSOP6 ,1.5 W,20 V,-5 A,R/TP ,P-CHANNEL 20-V(D-S) MOSFET, Pb free 6 Q302 TR,BJT,PNP EQBP0009901 TSMT6 ,0.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 170 - Level Location No. Description Part Number Spec Color Remark 6 R214 RES,CHIP,MAKER ERHZ0000443 2200 ohm,1/16W ,J ,1005 ,R/TP 6 R215 RES,CHIP,MAK.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 171 - Level Location No. Description Part Number Spec Color Remark 6 R429 RES,CHIP,MAKER ERHZ0000404 1 Kohm,1/16W ,J ,1005 ,R/TP 6 R430 RES,CHIP,MAKER ERHZ0000499 5600 ohm,1/16W ,J ,1005 ,R/TP 6 R431 RES,CHIP,MAKER ERHZ0000438 20 Kohm,1/16W ,J ,1005 ,R/TP 6 R433 RES,CHIP ERHY0013101 2.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 172 - Level Location No. Description Part Number Spec Color Remark 6 VA302 VARISTOR SEVY0004001 18 V, ,SMD ,3pF, 1005 6 VA303 VARISTOR SEVY0004001 18 .
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 173 - Level Location No. Description Part Number Spec Color Remark 6 R417 RES,CHIP ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP 6 R418 RES,CHIP ERHY000330.
11 . EXPLODED VIEW & REPLACEMENT P ART LIST - 174 - 1 1.3 Accessory Note: This Chapter is used for reference, Part order is ordered by SBOM standard on GCSC Level Location No. Description Part Number Spec Color Remark 3 SBPL00 BATTERY PACK,LI-ION SBPL0090501 3.
Note.
Note.
An important point after buying a device LG Electronics U250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought LG Electronics U250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data LG Electronics U250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, LG Electronics U250 you will learn all the available features of the product, as well as information on its operation. The information that you get LG Electronics U250 will certainly help you make a decision on the purchase.
If you already are a holder of LG Electronics U250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime LG Electronics U250.
However, one of the most important roles played by the user manual is to help in solving problems with LG Electronics U250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device LG Electronics U250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
