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LG U890 Service Manual

LG U890 Manual Online:

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LG U890 User Manual
LG U890 User Guide
LG U890 Online Manual

Text of LG U890 User Guide:

  • LG U890, - 150 - 1 B UP END DRAWING RIGHT LG Electronics Inc. HOT5 4 KEY Rev_1.1 9 FOLDER_SENSE EL OFF EL ON 2 Designer 3 Sign & Name LCD BACKLIGHT & FLASH LED NAME HOT4 ON_SW Checked MENU OK Approved 8 EL DRIVER IC 13 5 DRAWING SEARCH VOLUME_SIDE_KEY 8 4 A E SND C MODEL DateSection LGIC(42)-A-5505-10:01 10 Sheet/ 9 LEFT 6 D D B LG Electronics Inc. 76 0 BACKDN 5 KIM.D.K 2005 12/10 MUSE II 6/6 KEY & LCD CONN HIGH Sheets CAMERA_SIDE_KEY 3 NO. CLR 52 LCD_CONNECTOR 1 C LOW 2 7 4 A L600 56nH 65 R603 200 100K R604 UPLEFT C604 1u 6800p C610 0.1u C603 470uH L601 HOT3 EVLC14S02050VA603 PRSB6.8C D605 R606 100K 1u C601 0HOT4 89 6 7 8 9 7 37 38 39 4 40 41 42 43 44 45 46 47 48 49 5 50 22

  • LG U890, 5. DOWNLOAD - 123 - • The status Ready is displayed when the application is ready for downloading. While the images are transmitted from PC to the handset, a progressive bar (Red box) indicating the degree of transmission of data is displayed.

  • LG U890, 4. TROUBLE SHOOTING - 98 - 4.10 SIM Detect Trouble USB Initial sequence of U890 is : VREG_USIM_2.85V(C432 of PM6650-2) go to 3.0V -> USIM_CLK,USIM_RST,USIM_DATA triggered -> USIM IF work(Schematic and place are refer to SIM technical brief) Start Work well? VREG_USIM_2.85V is 3.0V? USIM_P_CLK is run? Change the Main board End Check J300, TP206,TP207, VREG_USIM_2.85V Yes No YES NO Re-insert the SIM card Change SIM card Work well? End Yes No USIM_P_DATA (J300 Pin 6) VREG_USIM_2.85V(J300 Pin 1) USIM_P_CLK (J300 Pin 3) USIM_P_RST (J300 Pin 2)

  • LG U890, 10. EXPLODED VIEW & REPLACEMENT PART LIST - 183 - Level Location No. Description Part Number Specification Color Remark 6 L130 INDUCTOR,CHIP ELCH0005009 100 nH,J ,1005 ,R/TP , 6 L131 INDUCTOR,CHIP ELCH0005002 2.7 nH,S ,1005 ,R/TP , 6 L300 INDUCTOR,CHIP ELCH0001550 56 nH,J ,1608 ,R/TP , 6 L400 INDUCTOR,CHIP ELCH0003813 47 nH,J ,1005 ,R/TP ,COIL TYPE 6 L401 INDUCTOR,SMD,POWER ELCP0008001 4.7 uH,M ,2.5*2.0*1.0 ,R/TP , 6 L402 INDUCTOR,SMD,POWER ELCP0008001 4.7 uH,M ,2.5*2.0*1.0 ,R/TP , 6 L403 INDUCTOR,SMD,POWER ELCP0008001 4.7 uH,M ,2.5*2.0*1.0 ,R/TP

  • LG U890, 4. TROUBLE SHOOTING - 117 - 4.19 Charger Trouble Shooting Charging Current Flow Charging Procedure - Connecting TA or USB Cable - Control the charging current by PM6050 IC using USB_CNT_N or CHG_CNT_N signal - Charging Current flows into the battery by control BATT_FET_N Check Point - Connection of TA or USB Cable - Charging current path - Battery Trouble Shooting Setup - Connect TA or USB Cable and battery to the phone Trouble Shooting Procedure - Check the charger connector - Check the charging current Path - Check the battery D2 D3 D4 G S Q402 SI3493DV-E3 D1 Q400 QST4 3 B 1 C1 C2 2 564 R406 0.1 B 3C1 12 C2 564 QST4 Q401 +5V_PWR USB_CNT_N CHG_CNT_N VBATT +VPWR USB_VBUS ICHARGE B

  • LG U890, 3. TECHNICAL BRIEF - 41 - 3.10 H/W Sub System 3.10.1 RF Interface A. RTR6250(WCDMA_Tx, GSM_Tx/Rx) MSM6250A controls RF part(RTR6250) using these signals. • SBST,SBDT,SBCK : SBI I/F signals for control Sub-chipset • PAON : Power AMP on RF part • RX_I/Q,TX_I/Q : I/Q for T/Rx of RF • TX_AGC_ADJ : control the gain of the Tx signal prior to the power amplifier Figure. Schematic of RF Interface of MSM6250A 33n C247 R216 51K R21851K TP203 C2480.1u R217 10K TP202 0.01u C246 Y25 Q_IM_CH0 Y26 Q_IP_CH0 W21 I_IP_CH0 W26 I_IP_CH1(Reserved) V21 I_IM_CH0 V25 I_IM_CH1(Reserved) U21 Q_IM_CH1(Reser

  • 3. TECHNICAL BRIEF - 62 - Handset main MIC BLK Audio Amp for loud Speaker MIC 3 G3 5 OUT 1 4 PWR U503 SP0102BE3 2 G1 G2 0 R509 47p C525 10u C523 C53110p C529 22n C528 22n C53033p MICBIAS MIC1N MIC1P Audio AMP C539 0.1u 20K R516 C536 22n BYPASS B3 GND IN+ A1 IN- C1 SD_MODE B2C2 SD_SEL B1 VDD A3 VO1 C3 VO2 LM4898ITLX-NOPBU504 A2 R517 20K 22nC537 C540 82p C538 1u 100KR512 C535

  • LG U890, 4. TROUBLE SHOOTING - 89 - 4.6.4 Checking PAM Block PAM Control Signal TP1. GSM_PA_RAMP : Power Amp Gain Control. typically, 0.5V < Vapc < 2.6V, TP2. GSM_PA_EN : Power Amp Enable (Power ON : higher than 2.5V , Power OFF : lower than 0.7V) TP3. GSM_PA_BAND : Power Amp Band Selection Control (GSM Mode : lower than 0.7V , DCS/PCS Mode : higher than 2.5V) TP4. +VPWR : PAM Supply Voltage Vcc higher than 3.28V TP1 TP2 TP3 TP4 Test Point (RF Tx Level) R102 0 6.8nH L119 R114 100 C117 10u L118 NA 15p C148 15p C149 C123 0.01u C116 33p C122 0.01u C121 10u 6 GND1 7 GND2 GND3 8 9 GND4 GND5 10 12 GND6 GND7 13 14 GND8 16 GND9 GSM_IN 4 GSM_OUT 11 PGND 21 RSVD_GND

  • 2.2 Usable environment 1) Environment 2) Environment (Accessory) * CLA : 12 ~ 24 V(DC) 2.3 Radio Performance 1) Transmitter - GSM Mode * In case of DCS : [A] -> 1710, [B] -> 1785 * In case of PCS : [A] -> 1850, [B] -> 1910 2. PERFORMANCE - 8 - Item Specification Voltage 4.0 V(Typ), 3.38 V(Min), [Shut Down : 3.28 V] Operation Temp -20 ~ +60 °C Storage Temp -20 ~ +70 °C Humidity 85 %

  • 3. TECHNICAL BRIEF - 51 - 3.10.4 Key Pad There are 26 buttons and 3 side keys in Figure. Shows the Keypad circuit. ‘END’ Key is connected On_SW to PMIC(PM6650-2) and MSM(GPIO76). Table Key Matrix Mapping Table COL0 COL1 COL2 COL3 COL4 COL5 ROW0 HOT1 (VT) HOT2 (H3G) HOT3 (MENU) CLR (Clear) FUNC_1 Side key (camera) ROW1 1 2 3 LEFT UP Side key (Down) ROW2 4 5 6 OK RI

  • LG U890, 3. TECHNICAL BRIEF - 67 - 3.12.3 Main Bottom Side Audio AMPU504PMIC(PM6650)U401 24pin connector for SUB PCBCN5001G NAND + 512M SDRAMU300 SPK & RCV Select ICU505Sleep crystal(32.768KHz)X400 MSM6250U201Inverter for bufferingU402 50pin connector for LCD Module CN602EL Driver ICU602 High freq. Noise filtering EMI filter FL60024pin camera connectorCN501 Camera direction detection ICU501Camera Dual LDO(2.7V/1.8V)U500 DescriptionReferenceDescriptionReference U501 CN501 U500 U401 U300 U602 X400 U402 Q403,Q404 U403 Q400 CN502 FL600 CN60

  • 5. DOWNLOAD - 121 - 5.2.1 Connecting to PC • Choose desired country and then click on the OK button. Once the desired country is selected, the selected country name will be displayed at the bottom of left corner screen. For instance, if the selected country is “Italy”, then LGMDP will operate based on the Italy Setting Values. In this case. the figure shown in the below will be disp

  • LG U890, 4. TROUBLE SHOOTING - 85 - 4.6.1 Checking VCO Block TP4 TP5TP6 TP1 TP2 TP3 Test Point (TXVCO Level) (2012) (PPS) 0.1u C150 24 R109 R121 51 220R118 0.01u C145 22n C128 R112 100 C133 82p 51 R116 100R113 FB100 1 OUT_GSM 9 SW1 11 SW2 3 VBVC 10 MQW5V0C869M GND1 2 GND2 4 GND3 6 7 GND4 GND5 8 GND6 12 13 GND7 GND8 14 5 OUT_DCSPCS U103 C151 100p L121 10nH 15 R111 C127 1000p 270 R120 150R117 VDD_M 15p C139 VDDA11 39 41 VDDA12 SBCK TX_MOD_CP 40 42 TX_VCO_FB C147 10u 0.1u C137 R106 82 10u L120 9.1nH C135 200 R119 R110 47 0.1u C144 C13633p 1000p C125 15p C138 C126 120p VREG_RFTX_2.85V VREG_MSMP_2.7V GSM_TX_VCO_0_EN_N GSM_TX_VCO_1_EN_N VREG_RFTX_2.

  • LG U890, • 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. The current security status will be displayed under Security column. Make sure that the selected country is valid. If the selected country is invalid, select the country name again. Integrity is automatically checked for the following country. Italy, United Kingdom, Hong Kong, and Austria. Integrity + Ciphering is checked for Australia, Sweden, and Denmark. Then click on the Connect button. (The port number(COM4) shall be different from that of the port number in the snapshot.) 5. DOWNLOAD - 12

  • LG U890, 10. EXPLODED VIEW & REPLACEMENT PART LIST - 181 - Level Location No. Description Part Number Specification Color Remark 6 C83 CAP,CERAMIC,CHIP ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP 6 C84 CAP,CHIP,MAKER ECZH0001121 470 pF,50V ,K ,X7R ,HD ,1005 ,R/TP 6 C85 CAP,CERAMIC,CHIP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP 6 C86 CAP,CERAMIC,CHIP ECCH0000128 100 pF,50V,J,NP0,TC,1005,R/TP 6 CN500 CONNECTOR,BOARD TO BOARD ENBY0021001 24 PIN,0.4 mm,ETC , ,H=2.5 6 CN501 CONNECTOR,BOARD TO BOARD ENBY0020401 24 PIN,0.4 mm,ETC , ,H=0.9, Socket 6 CN502 CONNECTOR,I/O ENRY0004

  • LG U890, 4. TROUBLE SHOOTING - 100 - 4.12 Camera Trouble Camera control signals are generated by MSM6250A and directly connected with MSM6250A. Start Check VREG_CAM_2.7V, VREG_CAM_1.8V Yes NO ENDCamera is OK? Check the camera conn. and reconnect the camera Change the U500 Camera is OK? Check the DSP_CLK Change the camera Yes Yes NO NO NO END Yes (FB500) Change the Main board Change the Main board FB500 Camera connector CAM_1.8V CAM_2.7V U501(Dual LDO for Camera)

  • LG U890, 4. TROUBLE SHOOTING - 74 - Check TP1 VCC of VCXO VCC 2.8V Check TP2 TRK_LO_ADJ 3V Volta g e0V Check TP3,4,5 With Oscilloscope 3V Volta g e0V VCXO is OK Check other part Check PMIC Yes Yes Yes No No No ≥ ≥ ≥ ≥≥ Check MSM Check soldering and components

  • LG U890, 9. CALIBRATION - 162 - 9.1.4 Example for setting file Ex1) Service center, Oversea factory, repair [ezlooks]=[off] [batcal]=[off] [svc]=[off] [standalone]=[off] [tescom]=[off] [process]=[auto] Ex2) Domestic factory [ezlooks]=[on] [batcal]=[off] [svc]=[off] [standalone]=[off] [tescom]=[off] [process]=[auto] *.If Tescom S/B is used, it should be [tescom]=[on]. AUTO Process Ex1) Service center [ezlooks]=[off] [batcal]=[off] [svc]=[on] [standalone]=[off] [tescom]=[off] [process]=[cal] Ex2) Oversea factory or repair [ezlooks]=[off] [batcal]=[on] [svc]=[off] [standalone]=[on] [tescom]=[off] [process]

  • LG U890, 4. TROUBLE SHOOTING - 77 - 4.5. Checking WCDMA Block START 1. Check VCXO 19.2MH z 2. Check ANT. SW Module ANT_SEL0, 1, 2 3. Check RF Tx Level 4. Check PAM Block 5. Check RF Rx Level 6. Re-download SW & CAL. 3. 4. 5. 1. 2.

  • LG U890, 5. DOWNLOAD - 134 - 5.3 Troubleshooting Download Errors 1) When the phone does not work after downloading has been completed. 2) Media Erasing Error 3) NV Restore Error 5.3.1 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 again including AMSS modem, Media, and Module image. • The phone supports a special mode called emergency mode. In this mode, minimum units for downloading is running so that users can download the images again in case of emergency situation. (AMSS modem, Media, and Module images can not be running

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