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LG T710B, Руководство по обслуживанию

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LG T710B Скачать руководство пользователя страница 32

Blank pedestal is on 

Pin 19, 20 and 21 of IC302

Is V_FLB and DC_bias on

G1 Pin at CRT socket?

G2 voltage is right?

22. Visible Retrace

Check white balance adjustment.

NO

NO

NO

Done.

Check G2 control volume and FBT.

Check IC302
and related components.

Check Q799 
and related components.

YES

YES

YES

- 32 -

Degaussing circuit is right?

Purity is right?

23. Purity Failure

Degaussing

YES

NO

Replace CRT and verify purity.

Done.

Refer to 6 NO Degaussing.

NO

YES

Содержание T710B

Страница 1: ...E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MENU SELECT Brightview MODEL T710BH T710BHL AL E CHASSIS NO CA 136 T710SH T710BHL AL M Issue Date 2004 7 T710B T710BL AL E T710S T710BL AL M ...

Страница 2: ...243 8 mm 12 80 x 9 60 Preset Image Size 310x 230 mm 12 20 x 9 06 4 2 Display Color Full Colors 4 3 Display Resolution 1280 x 1024 60Hz Max Non Interlace 4 4 Video Bandwidth 110 MHz 5 ENVIRONMENT 5 1 Operating Temperature 0 C 40 C Ambient 5 2 Relative Humidity 10 80 Non condensing 5 3 Altitude 5 000 m 6 DIMENSIONS with TILT SWIVEL Width 400 mm 15 75 inch Depth 411 mm 16 18 inch Height 401 mm 15 79 ...

Страница 3: ...joints frayed leads damaged insulation solder splashes or the sharp points Be sure to remove all foreign materials IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system but care should be taken to avoid damage and scratching during installation Use only same type display tubes X RADIATION The only potential source of X radiation is the picture tube H...

Страница 4: ...st receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices ...

Страница 5: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Страница 6: ...onnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on t...

Страница 7: ...1 1 14 2 70 0 57 V 85 07 11 755 11 178 0 577 0 056 0 503 0 018 H 68 677 14 561 10 836 3 725 1 016 2 201 0 508 V 85 00 11 764 11 182 0 582 0 044 0 524 0 014 Mode H V Sort 1 2 3 4 640x480 75Hz 800x600 85Hz 1024x768 85Hz 800x600 75Hz Dot Clock MHz Horizontal Frequency kHz Vertical Frequency Hz Horizontal etc µs Vertical etc ms Sync Polarity Frequency Total Period A Video Active Time B Sync Duration E...

Страница 8: ...remove the Tilt Swivel by pulling it upward 3 Pressing the latch b Back cover by pushing it upward 4 Release the latch c See Tip Spec 5 Slide the Back Cover away from the Front Cabinet of the monitor Tip C B A Tip Spec A Width 5 0 15 0mm B Depth 0 6 0 9mm C Height 12 0mm a Back Cover Cabinet c ...

Страница 9: ...WIRING DIAGRAM 9 P501 P201 P405 P301 P302 G2 P702 P701 T1 P402 P902 S S Signal Cable AC Socket FBT ...

Страница 10: ...ircuit Dynamic FOCUS Circuit Brightness Control 160V 40V 13V D D Feed Back 13V SCL SDA H Sync V Sync PWM Control Signal 13V 50V DY CDT Heater 6 3V I 2 C Screen H V R G B Bias H Drive B Drive B 13V DPM Control Circuit 5V 6 3V 8V 80V Voltage feedback Degaussing Coil Dynamic Focus Static Focus TILT Coil 50V 80V 5V G2 G1 Auto Beam Limit DC DC Converter FBT T701 Regulation Circuit 13V SMPS T901 5V BRIG...

Страница 11: ...hannel is controlled by MICOM through IIC The cut off circuit compensate different voltage of each channel between the cathode and the G1 of the CDT 1 The AC line voltage is rectified by the bridge diode D900 2 The control IC IC901 starts switching and generates switch pulse in the primary turn of the SMPS transformer T901 3 The switching pulses of the primary turns are induced to the secondary tu...

Страница 12: ...signal from 0 0 7 V to 0 4 V It is operated by taking the clamp R G B drive and contrast signal from the MICOM IC401 16 Video Output Amp Circuit This circuit amplifies the video signal which comes from the video pre amp circuit and amplified it to applied the CDT cathode ...

Страница 13: ...x position 1 Adjustment for B Voltage 1 Display cross hatch pattern at Mode 4 2 Check D961 cathode voltage within 50V 1V 2 Adjustment for High Voltage 1 Display cross hatch pattern at Mode 4 2 Enter the SVC SUB menu as the following instruction 3 Adjust H Voltage to 25 8kV 0 1 kV by adjust 1 P value 2 Adjustment by Service Hot key How to enter SVC HOT KEY 1 Press Menu and OSD window will appear 2 ...

Страница 14: ...0 Contrast Maximum Brightness Maximum Color temperature 9300K 11 1 Adjustment of cut off Adjustment of back raster 11 1 a Before adjustment press Menu and Degauss to remove Enter hot key mode Adjust Brightness and Contrast to Max in OSD window 1 Adjust cut off back raster first Enter DEGAUSS in the Menu and modify the following data Modify RCUT to Min Modify GCUT To Min Adjust to BCUT Data 127 7F ...

Страница 15: ...85Hz 69kHz 85Hz Display image White flat field Luminance Cut off point at the center of the display area Note Color purity adjustments should only be attempted by qualified personnel PROCEDURE For trained and experienced service technicians only Use the following procedure to correct minor color purity problems 1 Make sure the display is not affected by external magnetic fields 2 Very carefully br...

Страница 16: ...t above from number 6 to 16 20 COMMAND PRESET EXIT Y Yes command 2 Adjustment for White Balance and Luminance 1 Set the White Balance Meter 2 Press the DEGAUSSING on the OSD menu for demagnetization of the CDT 3 Display color 0 0 pattern at Mode 4 4 COMMAND PRESET START Y Yes command 5 Set Bightness and Contrast to max position 6 COLOR ADJ LUMINANCE command of the alignment program 7 COLOR ADJ BIA...

Страница 17: ...00 36 E6 10 00 00 1E 00 00 00 FD 00 32 A0 1E 50 47 0B 00 0A 20 20 20 20 20 20 00 00 00 FC 00 54 60 37 31 30 42 48 0A 20 20 20 20 20 20 00 00 00 FC 70 00 0A 20 20 20 20 20 20 20 20 20 20 20 20 00 18 220 IBM Compatible PC PAR ALLE L POR T Power inlet required Power LE D S T S witch Power S elect S witch 110V 220V C ontrol Line N o t u s e d R S 2 3 2 C P A R A L L E L V S Y N C P O W E R S T VGS MON...

Страница 18: ...D941 D942 D906 CHECK FUSE OK F901 18 TROUBLESHOOTING GUIDE 1 NO POWER NO POWER POWER INDICATOR OFF NO NO NO NO TROUBLE IN Q951 Q952 Q941 Q942 TROUBLE IN FUSE F901 SMPS Switch ON OFF Waveforms TROUBLE IN BRIDGE DIODE D900 TROUBLE IN IC901 Q901 TROUBLE IN D971 D961 D951 D904 D941 D942 D906 YES YES YES YES Q901 Drain IC901 6 2 1 ...

Страница 19: ...LE IN IC302 P301 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES 19 CHECK IC302 PIN 5 6 7 CHECK IC302 PIN 1 24 23 19 20 21 PIN 18 5V CHECK IC303 PIN 1 2 3 PIN8 8V PIN 4 80V CHECK R G B CATHODE VOLTAGE IC302 5 6 7 IC302 23 IC302 19 20 21 IC302 1 IC302 24 CDT RK GK BK Waveforms 28 27 30 31 26 27 28 29 30 31 29 ...

Страница 20: ...8 PIN20 PIN21 CHECK POWER INDICATOR GREEN or FLASH 20 3 NO RASTER FLASH NO NO NO TROUBLE IN IC401 MICOM TROUBLE IN P302 SIGNAL CABLE ROTATE SCREEN CONTROL KNOB TO CLOCKWISE or COUNTER CLOCKWIES TROUBLE IN PRIMARY CIRCUIT OF T901 TROUBLE IN CDT SOCKET BOARD GREEN YES YES YES NO VIDEO POWER INDICATOR GREEN or FLASH IC401 18 IC401 20 IC401 21 14 7 5 5 14 7 Waveforms ...

Страница 21: ...WTOOTH WAVE CHECK IC601 Pin 3 13V 21 4 NO VERTICAL DEFLECTION NO V DEFLECTION ONE HORIZONTAL LINE NO NO NO TROUBLE IN IC601 V CIRCUIT TROUBLE IN T901 13V Line Waveforms TROUBLE IN T701 40V line TROUBLE IN IC401 YES YES YES IC401 33 IC401 34 9 8 8 9 ...

Страница 22: ...YNC SIGNAL NO NO NO TROUBLE IN T901 or PC CHECK PC PC IS NOT GOING INTO DPM MODE TROUBLE IN X401 IC401 TROUBLE IN IC401 TROUBLE IN IC401 NO TROUBLE IN Q941 Q951 NO H V SYNC SIGNAL YES YES YES YES DPMS TABLE NORMAR ON ON NORMAL GREEN STAND BY OFF ON OFF 0V FLASH SUSPEND ON OFF OFF 0V FLASH OFF OFF OFF OFF 0V FLASH H V SYNC VIDEO LED MODE ITEM C401 45 IC401 46 CHECK IC401 PIN 16 5V HIGH 4 3 Waveform...

Страница 23: ...VOLTAGE 0 5V CHECK P902 CHECK RL901 CHECK IC401 PIN 4 5V 6 NO DEGAUSSING NO DEGAUSSING NO NO NO NO TROUBLE IN TH901 DEGAUSSING COIL TROUBLE IN IC401 MICOM TROUBLE IN D953 TROUBLE IN P902 TROUBLE IN RL901 YES YES YES YES 23 ...

Страница 24: ...O NO NO NO 1 Check IC401 Pins 39 40 41 2 Replace IC401 Check Q720 50V LINE D710 Check Q704 Check 13V line Check and replace T703 and Q706 Check DY connector connection YES YES YES IC401 18 Q706 Base Q706 Collector Q719 Drain Q705 Drain 5 18 19 21 20 Waveforms 8 Invariable H_Size NO Check and replace IC401 Check if DC voltage of IC401 PIN 35 wave is Variable 6 IC401 35 6 ...

Страница 25: ...ROUBLE IN IC401 MICOM TROUBLE IN Q711 Q716 TROUBLE IN L703 TROUBLE IN C722 C723 C726 C729 NO NO NO YES YES YES Cs SIGNAL TABLE HORIZONTAL FREQUENCY fH 30K 33 9K 34K 38 9K 39K 43 9K 44K 48 9K 49K 51 9K 52K 57 9K 58K 61 9K 62K 65 9K 66K 71K Cs1 L L H H H H H H H Cs3 L L L L L L L H H Cs2 L H L L H H H H H ...

Страница 26: ...eform Q706 Collector is right 26 10 Abnormal H_Size NO NO Repeat the troubleshooting Guide of H_deflection failure Check D D converter circuit Check IC401 B control circuit YES 11 Side Pin or Trap Failure NO 12 Para or Pin Balance Failure Replace IC401 Check and replace IC401 Q706 Collector IC401 35 21 6 21 6 Waveforms ...

Страница 27: ...401 Pin 26 output duty varies with different DAC values 13 Tilt Failure Check tilt connector connection Check and replace CRT NO NO Check and replace IC401 Check Q503 Q501 Q502 YES YES 14 V Size or Pos Variation Failure Check and replace IC401 and IC601 NO Check some parts around IC401 YES 27 IC401 33 IC401 34 Waveforms ...

Страница 28: ...ion failure YES YES 16 ABL Failure YES NO Check and replace CRT Input full white pattern to monitor Check P302 D801 R801 803 R798 Check and replace IC302 Check and replace T701 NO YES 28 Q719 Drain Q706 Collector IC302 Pin22 input exists and varies with different patterns T701 Pin 6 Voltage exists 18 18 Waveforms 21 21 YES waveform is right Q719 drain ...

Страница 29: ...Pin 24 output are right Q710 and parts around are right 17 Focus Failure NO NO NO Check the connection between FBT Pin 12 CRT Socket PCB Check and replace IC401 Waveforms Replace failed part Replace failed part YES YES YES 29 IC401 24 FBT 12 22 23 ...

Страница 30: ... are right IC401 Pin 45 and 46 inputs are right IC401 Pin 16 input is over 4 2V 18 Micom Failure 19 OSD Failure NO NO NO NO Done Change IC302 Check Q903 D908 ZD902 Check X401 Check and replace R451 C408 Replace IC401 YES YES YES YES 30 IC401 45 IC401 46 Waveforms ...

Страница 31: ...d replace IC401 Check and replace function key YES 21 Missing Color NO Change the CRT Check signal generator and signal cable NO Refer to 2 No Charcter NO Check and replace IC303 and IC304 NO Check C341 C346 and G2 wire Check around FBT circuits also YES YES YES YES 31 Proper AC voltage are on all cathodes Proper DC voltage are on all cathodes G2 voltage is right ...

Страница 32: ...ible Retrace Check white balance adjustment NO NO NO Done Check G2 control volume and FBT Check IC302 and related components Check Q799 and related components YES YES YES 32 Degaussing circuit is right Purity is right 23 Purity Failure Degaussing YES NO Replace CRT and verify purity Done Refer to 6 NO Degaussing NO YES ...

Страница 33: ...Done Change CRT and readjust convergence Yes Done No 25 Poor Focus Adjust focus VR Check focus leads from FBT to CRT Socket Check the CRT Socket YES Aging monitor and check for focus change NO Refer to 18 Dynamic Focus Failure NO Replace the CRT and verify focus YES 33 Dynamic focus circuit is right ...

Страница 34: ...EXPLODED VIEW 34 10 13 12 13 11 2 11 1 4 3 7 B A 2 6 6 5 9 8 a b c b 1 M EN U SE LE CT Br igh tvi ew ...

Страница 35: ... DM PWB PCB AS S E MBLY S UB T710BK CONTR OL TOTAL BR AND LGE NT PWB PCB AS S E MBLY S UB T710BHJ CONTR OL TOTAL BR AND CA 131 For Is rael ME TAL S HIE LD BOTTOM CB553 0 8T R E AR HOLE DE LE TE ME TAL S HIE LD BOTTOM C CKD For Is rael BR ACKE T CN771C S UPPOR TE R BOT R IGHT BR ACKE T CN771C S UPPOR TE R BOT LE FT S CR E W PTP 4 20BP MS WR FZMY BR ACKE T CB777H HOLDE R FBT MAIN TOTAL AS S E MBLY T...

Страница 36: ...CQ1031N409 0 01U 100V J POLY TP C417 0CK1040K945 0 1UF 50V Z F TR C419 0CQ2221N409 2200PF 100V J PE TP C420 0CQ6831N509 0 068U 100V K POLY TP C421 0CK1020K515 1000PF 50V K B TR C422 0CK2220K515 2200P 50V K B TS C423 0CK2220K515 2200P 50V K B TS C424 0CE475CK638 Ò4 7UF SHL SD 50V M FM5 TP 5Ó C426 0CK4710K515 470PF 50V K B TR C427 0CK4710K515 470PF 50V K B TR C501 0CE106CF638 Ò10UF SHL SD 16V M FM5 ...

Страница 37: ...34 100V 75VA 2000MA 4NSEC 0 025UA D703 0DRGF00120A MUR460 15MM GULF BK DO201AD 600V 4A 150A 45NSSEC 10UA D704 0DRFC00300A FFPF04U150S FAIR CHILD BK TO220F 1500V 4A 40A 150NSSEC 7UA D705 0DRTW00089A SRT14 1021 TIWAN SEMI TP NON 40V 1A 25A SEC 0 5MA D706 0DRFC00300A FFPF04U150S FAIR CHILD BK TO220F 1500V 4A 40A 150NSSEC 7UA D710 0DR400409AC UF4004 GULF TP DO41 400V 1A 30A 50NSEC 10UA D712 0DR100009C...

Страница 38: ...9AA KTC3198 Y KTC1815 TP KEC TO92 NPN Q716 0TR319809AA KTC3198 Y KTC1815 TP KEC TO92 NPN Q719 0TFFC10012A FQPF10N20C FAIRCHILD ST TO220F 200V 9 5A Q720 0TR390409CA FAIRCHILD 2N3904 TA TP TO 92 60V 0 2A Q799 0TRKE90019A MPSA92 KEC TP TO92 300V 500MA Q901 0TF760000AD SSS7N60B FAIRCHILD ST TO220F 650V 7A Q903 0TR100809AA KSC1008C Y TP SAMSUNG TO92 NPN Q941 0TR319809AA KTC3198 Y KTC1815 TP KEC TO92 NP...

Страница 39: ...W 5 TA52 R739 0RD2701Q609 2 70K 1 4W 3 5 TA52 R740 0RD0271A609 2 7 OHM 1 2 W 7 0 5 TA52 R744 0RD1001A609 1K OHM 1 2 W 7 0 5 TA52 R745 0RD4702Q609 47K 1 4W 3 5 TA52 R746 0RD2201Q609 2 20K 1 4W 3 5 TA52 R747 0RD3001Q609 3K 1 4W 3 5 TA52 R748 0RD4702Q609 47K 1 4W 3 5 TA52 R749 0RD2201Q609 2 20K 1 4W 3 5 TA52 R750 0RD3001Q609 3K 1 4W 3 5 TA52 R751 0RD0222A609 22 OHM 1 2 W 7 0 5 TA52 R752 0RD2201Q609 2...

Страница 40: ... 12V DC 1MA VERTICAL 7MMÓ T701 6174T11004F Ò1063A F700BK 71K JUNGWOO 17ÓÓÓ TH901 6322B00002D MZ72 4 5RN290V GAOLI 4 5OHM 30 20 2PIN BOX TH902 6322A00003C 8 D2 10 SEMITEC 8OHM 15 D 11 5 X401 6212AA2003E HC 49U SOUTH STAR 48MHZ 20 PPM 22PF BULK F1 430 858C AFC 520 BAE EUN TA F2 430 858C AFC 520 BAE EUN TA F901 0FZZTTH001B ÒTIME LAG HBC 5A 250V 215 005 LITTELFUSEÓ FB301 6210TCZ001J BAS3550T0 125 022J...

Страница 41: ... 20 01 21 22 01 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 10 Q901 Drain IC 801 8 IC 601 6 IC 601 8 Q833 Drain Q832 Drain Q801 B as e Q801 C ollector IC 802 3 Q704 G ate IC 305 5 6 7 IC 302 1 IC 302 24 IC 302 23 IC 302 19 20 21 C DT R K G K B K IC 901 6 IC 401 8 IC 401 9 IC 801 6 IC 801 11 IC 801 13 IC 801 12 IC 801 15 ＷＦ ２９ ＷＦ ２８ ＷＦ ２７ ＷＦ ２６ ＷＦ ３０ ＷＦ ３０ ＷＦ ７ ＷＦ １４ ＷＦ ５ ＷＦ ２２ ＷＦ ４ ＷＦ ３ ＷＦ １０ ...

Страница 42: ... 44 45 PRINTED CIRCUIT BOARD 3 MAIN BOARD Component Side 4 MAIN BOARD Solder Side 1 CONTROL BOARD Component Side 2 CONTROL BOARD Solder Side ...

Страница 43: ...Jul 2004 P NO 3828TSL105C Printed in China ...

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