LG DP270B Service Manual Download | Manualshive

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3-2

LCD PART

1) Power measuring

Measure each power after power supply.
C902(-) : -10V, C901(+) : +15V, C916(+) : +7.5V, C918(+) : +5VD, C914 : 3.3V

2) VCOM waveform adjustment

Adjust the VCOM level while changing the VR901 as below waveform by using the scope in the
C921.

Vcom Waveform

0.17V

3.72V

68.22

µ

s

3.89V

GND

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Summary of Contents for DP270B

Page 1: ...D SERVICE MANUAL MODEL DP271 DP271B LPA 837 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL DP271 DP271B LPA 837 SERVICE MANUAL P NO AFN33673330 APRIL 2007 http biz lgservice com ...

Page 2: ...CONTENTS SECTION 1 SUMMARY SECTION 2 EXPLODED VIEWS SECTION 3 ELECTRICAL SECTION 4 REPLACEMENT PARTS LIST ...

Page 3: ...MMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES SPECIFICATIONS 1 5 ...

Page 4: ...ized line plug has not been defeated 3 Soldering must be inspected to discover possible cold solder joints solder splashes or sharp solder points Be certain to remove all loose foreign particles 4 Check for physical evidence of damage or deterioration to parts and components for frayed leads or damaged insulation including the AC cord and replace if necessary 5 No lead or component should touch a ...

Page 5: ... include Metal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following technique...

Page 6: ...Dynamic range audio More than 85dB Harmonic distortion audio 0 08 Operatingconditions audio Temperature 41 F to 95 F Operation status Horizontal CONNECTORS Video input output VIDEO IN OUT ø2 6x7 8 10 0 10BC 28 0 10BC 3F L 1200MM Audio input output 2 0Vrms 1 KHZ 0 dB ø3 5m X 1 AUDIO IN OUT analog audio Earphone terminal ø3 5mm stereo mini jack X 1 LIQUID CRYSTAL DISPLAY Panel size 7inches 16 9 Proj...

Page 7: ...2 1 SECTION 2 EXPLODED VIEWS CONTENTS EXPLODED VIEWS 2 2 1 CABINET AND MAIN FRAME SECTION 2 2 3 PACKING ACCESSORY SECTION 2 3 ...

Page 8: ...5 A00 455 A53 296 295 298 297 451 279 278 284 285 CABLE1 453 262 267 251 252 253 272 277 A51 261 264 277 A46A A45A FRONT BOARD LCD BOARD KEY BOARD MAIN BOARD 283 809 A42 A46 CABLE2 CABLE3 453 266 EXPLODED VIEWS 1 CABINET AND MAIN FRAME SECTION ...

Page 9: ...2 3 2 PACKING ACCESSORY SECTION 808 BATTERY 802A BOX INNER 834 CABLE CIJAR JACK 806 PLUG ASS Y 833 ADAPTER 900 REMOTE CONTROL 801 OWNER S MANUAL 804 PACKING SHEET 803 PACKING 802 BOX CARTON ...

Page 10: ...PTICAL AND COAXIAL OUTPUT ASPDIF 3 24 8 MT1389 VIDEO OUTPUT WAVEFORM 3 24 9 AUDIO OUTPUT FROM AUDIO DAC 3 25 WIRING CONNECTION DIAGRAMS 3 26 1 WIRING CONNECTION DIAGRAM 1 3 26 2 WIRING CONNECTION DIAGRAM 2 3 27 BLOCK DIAGRAMS 3 28 1 OVERALL BLOCK DIAGRAM 3 28 2 POWER BLOCK DIAGRAM 3 29 3 SERVO BLOCK DIAGRAM 3 30 4 SYSTEM BLOCK DIAGRAM 3 31 5 AV BLOCK DIAGRAM 3 32 CIRCUIT DIAGRAMS 3 33 1 MPEG CIRCU...

Page 11: ...ach power after power supply C902 10V C901 15V C916 7 5V C918 5VD C914 3 3V 2 VCOM waveform adjustment Adjust the VCOM level while changing the VR901 as below waveform by using the scope in the C921 Vcom Waveform 0 17V 3 72V 68 22µs 3 89V GND ...

Page 12: ... Appear shadow form interference in black background IC U1 normal operate IC U1 Check and Replace YES NO 5V normal IC U901 Check and Replace YES YES NO 7 5V 15V 10V normal D907 D901 D902 NO Main B D on located RGB signal output Check and Replace MPEG1389 Pin 184 185 187 YES NO IC U902 and Replace VCOM signal 4 5V NO ...

Page 13: ... Normal condition MAIN B D Check YES NO TFT LCD pressure voltage 15V 14V 5V Power source and D901 D902 U901 Check YES NO TFT LCD normal Replace YES NO Color adjusting normal Readjust as adjustement standard YES Each connector Replace and Reassemble YES NO Replace END NO ...

Page 14: ...414A IC VOLTAGE SUPPLY SMOTHLY LCD POWER BLOCK VGH 15V VGL 1 0V 7 5V 5V MP1540 IC R G B Circuit BLOCK ROUT GOUT BOUT VCOM VGH VGL STVR STVL CKV UND OEV VCOMO LNR MOD OEH STHL STHR CPH3 CPH2 CPH1 89P_ R 89P_ G 89P_ B LCD PANEL SPEAK SP L SP L SP R SP R BACKLIGHT BAT_ OUT PWRCTL_ LCD MP2359 IC INVERTER POWER BLOCK Connector Main interface BLOCK DIAGRAM ...

Page 15: ...3 6 MEMO ...

Page 16: ...LNR VCOMO OEV CKV UND STVR STVL STVR STVL CKV OEV UND OEH LNR STHL STHR CPH1 VCOMO BAT_OUT PWRCTL_LCD 89P_R 89P_G 89P_B 3 3V BAT_OUT 3 3V 2 3 4 8 SP_L 5 SP_L 5 SP_R 5 SP_R 5 GND 2 3 4 5 6 8 STVR 2 STVL 2 CKV 2 OEV 2 UND 2 LNR 2 STHL 2 STHR 2 CPH1 2 VCOMO 2 BAT_OUT 4 6 PWRCTL_LCD 2 89P_R 2 89P_G 2 89P_B 2 OEH 2 TP702 TP702 TP704 TP704 TP701 TP701 J701 CON20 J701 CON20 1 2 3 4 5 6 7 8 9 10 11 12 13 ...

Page 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...

Page 18: ...O YES 1 POWER DC DC CONVERTER CIRCUIT Is ADAPTOR out 9 5V Replace D606 NO NO YES YES Is D606 OK Replace U202 Replace U401 Replace JK902 No 3 3V No 5V No LCD power No 18V YES YES Is U202 3 3V OK NO Replace U401 Is U401 3 3V OK YES No power on by BATTERY A Replace BATTERY NO YES Is BATTERY OK YES A ...

Page 19: ...dio jack mode S W NO YES YES Is Q501 and Q503 OK Speakers NO YES YES Is speakers OK Replace B AUDIO OUT ABNORMAL D AUDIO IN SPEAKER ABNORMAL Video in abnormal Refer to LCD part Replace U501 IC Check Video jack mode NO YES YES Is U501 OK Check R203 R202 C202 YES YES E VIDEO IN ABNORMAL Video out abnormal Check Video jack mode YES YES Check Video signals from MPEG YES Check IC U501 YES Check LC filt...

Page 20: ...O part YES NO MAIN ELECTRICAL TROUBLESHOOTING GUIDE Picture abnormal Check the disc YES YES Refer to SERVO part YES Check MPEG_CLK Signal of MPEG part YES Check MPEG IC U201 YES Replace B D F PICTURE ABNORMAL H OPEN CLOSE ABNORMAL Disc error Check Disc YES YES Refer to SERVO part YES YES If OK YES If OK YES If OK If OK Replace B D G DISC ERROR ...

Page 21: ...PEG data signal normal NO YES Check CD DVD DSP output signal Check MPEG Decoder input signal NO Is error signal normal YES OK Check CD DVD DSP output signal Check MPEG Decoder input signal NO Does the Video of the video CD play properly Is MPEG data signal normal NO Check clock signal NO Does the audio sound output normally Does the audio signal output from MPEG decoder NO Check clock signal NO Is...

Page 22: ...d MT1389 Put Disc in NO Check the related circuit on MT1389 RFL signal NO Disc ID is correct Proper RFL signal on MT1389 NO YES YES YES Check the cable connection between spindle and main PCBA Check DMSO related circuit on MT1389 NO Does spindle rotate Proper DMSO signal on MT1389 NO YES Replace IC U201 YES D YES ...

Page 23: ...EO sugnal NO Proper FEO signal on MT1389 YES YES Check cable connection on pick up head Check the related circuit on MT1389 NO Track on OK Proper FEO signal on MT1389 NO Disc is play NO YES Check the TRSO connection on MT1389 and motor dirver NO Properly TRSO signal on MT1389 YES Check the tracking control amp circuit on motor driver T T output properly YES Check RF signal waveform YES YES E D YES...

Page 24: ... when disc playback Proper Aout_L Aout_R signal on MTK1389 NO Check the related circuit of Audio DAC NO YES YES Check communi cation lines on MT1389 NO Normal IR VFD Front pannel key functions Commu nications between IR VFD Front pannel key MT1389 Front µ com is normally NO NO YES Check the cable connection on Front pannel TEST END YES E YES ...

Page 25: ...L TROUBLESHOOTING GUIDE Is U603 OK No turn on Red LED Is 8 4V of J602_Pin 1 OK YES Replace IC U603 NO Is L601 OK Replace L601 YES NO Is IC U601 OK Replace IC U601 YES NO Is L602 OK Replace L602 YES NO NO CHARGEING CIRCUIT ...

Page 26: ...WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1379 main clock is at 27MHz X201 FIG 1 1 2 SDRAM CLOCK 1 MT1389 main clock is at 27MHz R308 FIG 2 1 U301 PIN38 DCLK 125MHz Vp p 3 7V ...

Page 27: ...3 20 3 DISC TYPE JUDGEMENT WAVEFORM FIG 3 1 FIG 3 2 F U401 PIN8 F U401 PIN8 FE U201 PIN26 FE U201 PIN26 RFL U201 PIN21 RFL U201 PIN21 ...

Page 28: ...3 21 FIG 3 3 FIG 3 4 F U401 PIN8 F U401 PIN8 FE U201 PIN26 FE U201 PIN26 RFL U201 PIN21 RFL U201 PIN21 ...

Page 29: ...3 22 4 FOCUS ON WAVEFORM 5 SPINDLE CONTROL WAVEFORM NO DISC CONDITION FIG 4 1 FIG 5 1 FOSO U401 PIN11 DMSO U401 PIN12 F U401 PIN8 SP U401 PIN15 F U401 PIN9 SP U401 PIN14 ...

Page 30: ...3 23 6 TRACKING CONTROL RELATED SIGNAL SYSTEM CHECKING FIG 6 1 FIG 6 2 TE U201 PIN27 TE U201 PIN27 TRSO U401 PIN23 TRSO U401 PIN23 T U401 PIN18 T U401 PIN17 T U401 PIN18 T U401 PIN17 ...

Page 31: ...3 24 7 MT1389 AUDIO OPTICAL AND COAXIAL OUTPUT ASPDIF FIG 7 1 FIG 8 1 U201 PIN208 ASDIF Vpp 2 5V U501 PIN14 8 MT1389 VIDEO OUTPUT WAVEFORM 1 Full colorbar signal CVBS ...

Page 32: ...3 25 FIG 9 1 JK601 PIN4 5 MR 1kHz 0dB 9 AUDIO OUTPUT FROM AUDIO DAC 1 Audio L R 2 Audio related Signal ASDAT0 IC301 PIN3 ABCK IC301 PIN4 ALRCK IC5301 PIN5 ASDATA3 FIG 9 2 ...

Page 33: ...3 26 WIRING CONNECTION DIAGRAMS 1 WIRING CONNECTION DIAGRAM 1 MAIN PCB LCD PCB MAIN PCB MAIN PCB ...

Page 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...

Page 35: ...OA V20 M DISC SPINDLE MOTOR DECK MECHANISM PICK UP SLED MOTOR M F F T T SP SP A B C D E F RFO MDI1 2 LIMIT NJM4580M A 5V PT2303 A 5V SP_L R SP_L R OP OP TROPEN M5V ASPDIF CM1117 VCOMO CPH1 2 3 MOD 89P_R G B STHL R STVL R OEH V LNR UND CKV PWRCTL_LCD AV IN OUT SPK H P COAXIAL BH1418FV FM 3 3V FM_SCS SCLK SDO 16KBit EEPROM 3 3V SCL SDA BATTERY SI4335 DC_IN DC DC BLOCK1 DC DC BLOCK2 3 3V M5V 2F2301P ...

Page 36: ...r CT CT L LCD Grid Reg 5VA 5VA 5V 5V 3 3 3 3V 1 8 1 8V S W S W DVB DVB 3 3 3V 3V SW SW TU TU DV DVD D5V D5V Voltage Inverter 5V 5V Sta Standb ndby Sta Standb ndby Sta Standb ndby LCD Panel Video Audio System Servo 5VA 5VA 5V 5V 3 3 3 3V 1 8 1 8V 5V 5V 3 3 3 3V LCD Vcc 7 5 7 5V 15V 15V 10 10V D5V D5V 7 5 7 5V 15V 15V 10 10V D5V D5V 5VA 5VA S W DVB DVB 5V 5V SW SW TU TU DV DVD D5V D5V 5V 5V 3 3 3 3V...

Page 37: ...DVD A B C D RF CD A B C D E F RF PICK UP X501 IC201 MTK1389P P DVDPLAYER ONE CHIP FMSO DMSO FOSO TRSO STBY V1P4 FO FO TR TR 27MHz X TAL CDLD LD01 DVDLD LD02 IOA LIMIT ALPC MDI1 MDI2 Spi Spindle dle Mo Moter SL SL Steppi Steppi ng ng Mo Moter OP OP OPO SP SP ...

Page 38: ...7 A0 A19 AA20 AA21 PCE PRD PWR 27MHz A 5V SDI 5VA REMOCON RECEIVER KEY1 LCD MODE DISPLAY SETUP MENU UP DOWN LEFT RIGHT ENTER Power Charge LED KEY2 AD_K2 3 3V 3 3V 2 20 8 8Mbit 2 21 8 16Mbit 2 22 8 32Mbit 2 14 2 8 16 64Mbit 1 8V 3 3V MT1389P MPEG POWER PLAY PAUSE REW FF STOP COLOR BRIGHT AV IN OUT LCD OPEN AD_K1 IR RED GREEN 16KBit EEPROM 3 3V SDA SCL M_RESET System AV Part ...

Page 39: ... 3V CVBS AUDIO PT2303 SPK SPK A 5V SP_L L H P JACK SP_L R A_MUTE_SW NJM4580M OP AMP A 5V AV IN OUT ASPDIF COAXIAL JACK SP_MUTE BH1418FV FM 3 3V ML_OUT MR_OUT FM_SCS SCLK SDO VOLUME System AV Part 2F2301P 3 3V 3 3V AV_JACK_IN FSAV330 A 5V CVBS_IN VIDEO_IO_CTL VIDEO ADC AV OUT PATH AV IN PATH ...

Page 40: ...203 AAT4610 NC VOUT 1 VIN 5 GND 2 SET 3 ON 4 L201 FB L201 FB C214 1000pF C214 1000pF L212 FB L212 FB C206 20pF C206 20pF R203 18 R203 18 CE205 47uF 6 3V CE205 47uF 6 3V R214 100K R214 100K L210 FB L210 FB C252 0 1uF C252 0 1uF C271 0 1uF C271 0 1uF R231 2 2K R231 2 2K R215 560 R215 560 TP210 TP210 R204 100K R204 100K C283 1uF C283 1uF C239 1uF C239 1uF R223 0 R223 0 C234 1uF C234 1uF C263 0 1uF C2...

Page 41: ...A20 10 OE 28 BYTE 47 A18 16 D0 29 D1 31 D2 33 D3 35 A9 7 CE 26 D4 38 D5 40 D6 42 D7 44 D8 30 D9 32 WP ACC 14 D11 36 D12 39 D13 41 D14 43 D15 45 VCC 37 GND1 27 WE 11 A19 9 D10 34 GND2 46 A10 6 A12 4 A11 5 A13 3 A14 2 A15 1 A16 48 A17 17 RESET 12 U301 HY57V641620ETP 7 C U301 HY57V641620ETP 7 C VCC 1 DQ0 2 DQ1 4 VSSQ 12 DQ2 5 DQ3 7 VCCQ 9 DQ4 8 DQ5 10 VSSQ 46 DQ6 11 DQ7 13 DQML 15 WE 16 CAS 17 RAS 18...

Page 42: ...2 6 8K R422 6 8K CE414 47uF 6 3V CE414 47uF 6 3V R424 4 7 R424 4 7 C409 0 1uF C409 0 1uF U402 TPS60400 U402 TPS60400 OUT 1 Cfly 5 IN 2 Cfly 3 GND 4 L416 10uH L416 10uH C413 0 1uF C413 0 1uF L405 FB L405 FB R436 10 R436 10 R404 680K R404 680K TP402 TP402 C416 68pF C416 68pF D401 1N5819 D401 1N5819 R416 100 R416 100 R420 680K R420 680K Q409 SMBT3904 Q409 SMBT3904 C421 0 1uF C421 0 1uF R432 10K R432 ...

Page 43: ... 30 9K R509 30 9K C528 1uF 50V C528 1uF 50V C509 22pF C509 22pF C502 100pF C502 100pF Q505 SMBT3904 Q505 SMBT3904 1 3 2 C504 56pF C504 56pF R523 10K R523 10K R525 1 2K R525 1 2K C505 100pF C505 100pF R502 10K R502 10K C520 1uF 50V C520 1uF 50V Q510 BAT54S NC Q510 BAT54S NC VR501 VOLUME VR501 VOLUME 1 1 2 2 3 3 4 4 5 5 6 6 7 7 R556 4 7K R556 4 7K R541 220 R541 220 R532 10K R532 10K CE503 10uF 16V C...

Page 44: ...GT6319 U603 GT6319 CMSDA 3 RST 9 GND 10 CMCLK 4 VCC 19 VREF 22 OSC 20 GRN 2 RED 1 PR_CTL2 21 PIE 23 NC2 5 PR_CTL 8 PWM 7 MCS 6 MCLK 24 MSDO 25 MSDI 26 NC1 27 IR_DA 28 AD_BATU 11 AD_CHG1 12 AD_BATT 13 AD_K1 14 NC4 18 NC3 17 AD_PR 16 AD_K2 15 TP610 TP610 C623 100pF C623 100pF R603 1K R603 1K CE604 220uF 16V CE604 220uF 16V TP617 TP617 R648 NC R648 NC C614 0 1uF C614 0 1uF C602 20pF C602 20pF R658 20...

Page 45: ...7K R809 47K L805 56nH 0603 L805 56nH 0603 Q804 SMBT3906 Q804 SMBT3906 C821 10uF 10V 1206 C821 10uF 10V 1206 R802 10K R802 10K R823 10K R823 10K R820 0 R820 0 C807 0 1uF C807 0 1uF C814 10uF 10V 1206 C814 10uF 10V 1206 R824 20K R824 20K C813 10uF 10V 1206 C813 10uF 10V 1206 R817 3 3K R817 3 3K C832 0 1uF C832 0 1uF C831 0 1uF C831 0 1uF C803 10uF 10V 1206 C803 10uF 10V 1206 R826 10K R826 10K R806 0...

Page 46: ... R944 10K R944 10K C911 0 1uF C911 0 1uF U901 78L05 U901 78L05 GND 2 VOUT 1 VIN 3 Q905 SMBT3904 Q905 SMBT3904 1 3 2 R908 10K R908 10K C906 0 1uF C906 0 1uF C952 0 1uF C952 0 1uF L908 FB 1206 L908 FB 1206 R939 20k R939 20k L903 1 8uH L903 1 8uH R933 270 R933 270 R903 6 8K R903 6 8K C960 0 1uF C960 0 1uF TP908 TP908 C920 10uF 16V C920 10uF 16V BOTTOM JK904 HEADER 26 SMD0 5 BOTTOM BOTTOM JK904 HEADER...

Page 47: ... 2K 1 R7A7 15K 1 R7A7 15K 1 SW7A4 MENU SW7A4 MENU 1 2 R7A3 2K 1 R7A3 2K 1 SW7A8 RIGHT SW7A8 RIGHT 1 2 R7B0 8 2K 1 R7B0 8 2K 1 SW7B3 ENTER SW7B3 ENTER 1 2 SW7A7 LEFT SW7A7 LEFT 1 2 SW7A1 LCD_MODE SW7A1 LCD_MODE 1 2 R7A6 8 2K 1 R7A6 8 2K 1 R7A8 39K 1 R7A8 39K 1 J7A1 CON3 J7A1 CON3 1 2 3 SW7B1 OPPOSITION SW7B1 OPPOSITION 1 2 SW7A3 SETUP SW7A3 SETUP 1 2 R7A4 3K 1 R7A4 3K 1 Document Number 10 MENU KEY ...

Page 48: ...3 STOP 1 2 SW7C2 PLAY PAUSE SW7C2 PLAY PAUSE 1 2 R7C1 1 2K 1 R7C1 1 2K 1 R7C3 2K 1 R7C3 2K 1 R7C4 3K 1 R7C4 3K 1 R7C2 1 5K 1 R7C2 1 5K 1 Document Number 11 FRONT KEY LG MALATA Monday January 15 2007 Document Number 11 FRONT KEY LG MALATA Monday January 15 2007 Document Number 11 FRONT KEY LG MALATA Monday January 15 2007 9 FRONT KEY CIRCUIT DIAGRAM ...

Page 49: ...3 2 156 0 0 157 0 0 158 0 0 159 0 0 160 1 7 1 7 161 0 0 162 0 0 163 0 0 164 0 0 165 0 0 166 0 0 167 0 0 168 0 0 169 0 0 170 3 2 3 2 171 0 0 172 0 0 173 3 2 3 2 174 1 8 1 7 175 3 2 3 2 176 3 2 3 2 177 3 2 3 2 178 0 0 179 0 0 180 3 2 3 2 181 0 0 182 0 0 183 2 6 2 6 184 1 4 1 4 185 1 4 1 4 186 0 0 187 1 4 1 4 188 3 2 3 2 189 0 0 190 3 2 3 2 191 1 2 1 2 192 0 0 193 1 2 1 2 194 1 2 1 2 195 3 2 3 2 196 ...

Page 50: ... Base 0 0 MODE PIN NO STOP PLAY Q505 Emitter 0 0 Collector 0 0 Base 0 0 Q506 Emitter 0 0 Collector 0 0 Base 0 0 Q507 Emitter 0 0 Collector 0 0 Base 0 0 Q508 Emitter 0 0 Collector 5 5 Base 0 0 Q510 Emitter 5 5 Collector 1 2 1 2 Base 0 0 Q512 Emitter 5 5 Collector 0 0 Base 5 5 Q514 Emitter 0 0 Collector 0 0 Base 0 0 Q601 Emitter 10 10 Collector 10 10 Base 10 10 Q602 Emitter 10 10 Collector 0 0 Base ...

Page 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...

Page 52: ...3 57 3 58 MAIN P C BOARD BOTTOM VIEW ...

Page 53: ...3 59 3 60 2 KEY MENU P C BOARD TOP VIEW BOTTOM VIEW 3 KEY FRONT P C BOARD TOP VIEW BOTTOM VIEW ...

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