LG Flatron 774FT, Service Manual

Page 1: ...tp biz LGservice com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CA 113 MODEL 774FT ID LABEL FB774G EL Same looking with New Chassis Issue Date MAY 2002 ...

Page 2: ...25 4 x 244 1mm 12 91 x 9 61 Preset Image Size 310 x 230 mm 12 20 x 9 06 4 2 Display Color Full Colors 4 3 Display Resolution 1280 x 1024 60Hz Non Interlace 4 4 Video Bandwidth 110MHz 5 ENVIRONMENT 5 1 Operating Temperature 10 C 35 C Ambient 5 2 Relative Humidity 10 90 Non condensing 5 3 Altitude 5 000m 6 DIMENSIONS with TILT SWIVEL Width 415 0mm 16 34 inch Depth 439 0mm 17 28 inch Height 435 0mm 1...

Page 3: ... Soldering must be inspected for the cold solder 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 pote...

Page 4: ...5 14 561 11 764 Video Active Time A 20 32 12 802 16 16 12 798 14 22 11 178 10 836 11 182 Blanking Time B 6 35 0 533 5 17 0 533 4 41 0 577 3 725 0 582 Sync Duration D 2 03 0 080 1 62 0 064 1 14 0 056 1 016 0 044 Back Porch C 0 51 0 026 0 32 0 021 0 57 0 018 0 508 0 014 Front Porch F 3 81 0 427 3 23 0 448 2 70 0 503 2 201 0 524 Resolution 640 X 480 75Hz 800 X 600 75Hz 800X 600 85Hz 1024 X 768 85Hz 4...

Page 5: ...creen display 4 OSD Select Adjustment Use for selecting highlighting an OSD icon and adjusting level of the selected menu 5 OSD Button This button to enter or exit the on screen display See Front Control Panel Signal Cable AC Power Socket Buttons OSD Button Power Button Power Indicator Shortcut Keys Brightness and Contrast can be adjusted directly without entering the On Screen Display OSD system ...

Page 6: ...l 4 Accept the changes by pressing the SET button 5 Exit the OSD by pressing the OSD Button 6 BRIGHTNESS CONTRAST 100 100 BRIGHTNESS CONTRAST 100 100 OSD SET SET OSD BRIGHTNESS CONTRAST 100 100 COLOR PRESET TEMP RED GREEN BLUE 6500K 9300K Birghtness To adjust the screen brightness level Contrast To adjust the image contrast level 6500K 9300K To appear the display s color temperature 6500K Slightly...

Page 7: ...rference Horizontal Scan Line with the periodical dot screen It is normally OFF H 0 V 0 The moire adjustments may affect the focus of the screen Moire adjustments may shake slightly while the moire reduction function is on Purity Use to adjust the overall purity of the image if the appears uneven Tilt To correct the image rotation Side Pincushion To correct bowing in or out of the image Side Pincu...

Page 8: ...AY Protection Circuit FBT T701 Dynamic Focus Circuit Auto Beam Limit Vertical Blanking Brightness Control 160V 40V 15V D D Feed Back 15V MICOM IC401 SCL SDA H V Sync PWM Control 12V 15V 175V DY CDT Heater 6 3V I 2 C I 2 C I 2 C H V Sync G1 Screen Dynamic Focus Static Focus H V R G B Bias R G B Contrast H DRV B DRV B 15V COIL DEGAUSSING COIL I 2 C Brightness Contrast H V Position H V Size Tilt SPCC...

Page 9: ...d resolution 3 The Micom sets operating mode and offers the controlled data H Size H Position V Size 4 The controlled data of each mode is stored in itself 5 User can adjust screen condition by each OSD functio tHhe data of the adjusted condition is stored in EEPROM IC402 6 Horizontal and Vertical Oscillation This circuit generates the horizontal pulse and the vertical pulse by takijg the H and V ...

Page 10: ...deflection yoke of the CRT 16 Video Pre AMP Circuit This circuit amplifies the analog vdeo signal from 0 0 7V to 0 4V It is operated by taking the clamp R G B drive and contrast signal from the MICOM IC401 17 Video Output AMP Circuit This circuit amplifies the video signal which comes from tehe video pre amp circuit and amplifies it to applied the CRT cathode ...

Page 11: ...est condition 8 DIST ADJ BALANCE command 9 Adjust parallelogram as arrow keys to be the best condition 10 Adjust balance of pin balance as arrow keys to be the best condition 11 DIST ADJ Æ FOS ADJ command 12 Adjust V SIZE as arrow keys to 200 4mm 13 Adjust V POSITION as arrow keys to center of the screen 14 Adjust H SIZE as arrow keys to 270 4mm 15 Adjust H POSITION as arrow keys to center of the ...

Page 12: ...inance 23 After push the ENTER key and COMMAND PRESET EXIT Y Yes command 24 Exit the program 4 Input EDID Data 1 Display color 15 0 cross hatch pattern at Mode 4 2 EEPROM Æ Write EDID command and confirm EDID Write OK message of monitor 3 Exit from the alignment program 4 Power switch OFF ON for EDID data save 5 Adjustment for Focus 1 Set the Brighteness and Contrast to max position 2 Display H ch...

Page 13: ...01 TROUBLE IN IC901 TROUBLE IN D941 D942 D951 D961 D962 D971 TROUBLE IN Q903 Q952 Q951 Q942 Q941 CHECK FUSE OK CHECK C908 VOLTAGE AC120V 170VDC AC220V 310VDC NO YES YES YES YES NO NO NO CHECK IC901 PIN 5 WAVEFORM SQUARE WAVE COMES OUT CHECK D941 D942 D951 D961 D962 D971 VOLTAGE 1 NO POWER ...

Page 14: ... PIN 1 2 3 CHECK IC303 PIN 4 80V 8 12V TROUBLE IN P302 5V LINE TROUBLE IN PC SIGNAL P301 SIGNAL CABLE TROUBLE IN IC302 TROUBLE IN P302 12V LINE 80V LINE TROUBLE IN IC303 NO YES NO NO YES YES YES YES NO NO CHECK R G B CATHODE VOLTAGE TROUBLE IN R341 R343 R331 R333 L311 L313 D307 D315 TROUBLE IN CRT SOCKET YES NO ...

Page 15: ... INDICATOR GREEN or ORANGE CHECK D712 ANODE 157V CHECK G1 VOLTAGE 55 150V TROUBLE IN D712 TROUBLE IN CDT TROUBLE IN Q799 DPM MODE NO H and or V SYNC ORANGE NO GREEN YES YES NO 3 NO RASTER CHECK CDT HEAT VOLTAGE 6 3V TROUBLE IN D941 Q942 Q941 NO ...

Page 16: ...E VERTICAL LINE CHECK Q706 CHECK B VOLTAGE 50V CHECK T701 FBT PIN 2 31KHZ 60V 69KHZ 140V CHECK Q701 COLLECTOR WAVEFORM TROUBLE IN Q706 TROUBLE IN 50V LINE TROUBLE IN Q719 Q720 D710 TROUBLE IN Q701 TROUBLE IN T701 P701 NO NO YES YES YES YES NO NO 0V T ...

Page 17: ... TROUBLE IN IC401 MICOM TROUBLE IN Q711 Q716 Q734 Q736 Q738 TROUBLE IN RL701 NO NO YES YES Cs SIGNAL TABLE HORIZONTAK FREQUENCY fH 66K 39K 63K 66K 57K 63K 49K 57K 46K 49K 43K 46K 36K 43K 33K 36K 30K 33K Cs0 H H H H L L L L L Cs1 H H L L H L H H L Cs2 H L H L H H H H L Cs3 H H H H H H L L L Cs4 H H H H H H H L L ...

Page 18: ...TION NO V DEFLECTION ONE HORIZONTAL LINE CHECK IC601 PIN 2 15V CHECK IC601 PIN 4 12V CHECK IC601 PIN 1 TROUBLE IN Q601 Q602 Q603 15V LINE TROUBLE IN SMPS D937 TROUBLE IN IC701 TROUBLE IN IC601 V CIRCUIT NO NO YES YES YES NO 3V ...

Page 19: ...01 PIN8 V FBP T701 40V LINE TROUBLE IN IC302 IC301 TROUBLE IN IC301 IC302 NO YES DC 5V YES YES YES NO NO NO Pin 5 5V Pin 10 5V H V 5V H V CHECK IC301 B CHECK IC301 PIN 12 WAVEFORM ENTER BUTTON MUST BE PRESSED 7 TROUBLE IN OSD CHECK IC301 PIN 5 10 WAVEFORM CHECK IC311 PIN 13 14 15 ...

Page 20: ...T GOING INTO DPM OFF MODE TROUBLE IN X401 TROUBLE IN IC401 MICOM TROUBLE IN Q41 Q942 Q951 Q952 TROUBLE IN PC DPM MODE FAILURE INPUT H V SYNC SIGNAL NO H V SYNC NO DPM MODE NO NO NO DPMF 0V DPM TABLE Mode Item NORMAL STAND BY SUSPEND OFF DPMS H L L L LED GREEN ORANGE ORANGE ORANGE DPMF H H H L YES SEE DPM TABLE YES YES 5V 6MHz 8 TROUBLE IN DPM ...

Page 21: ...TOR VOLTAGE CHECK P902 CHECK RL901 TROUBLE IN IC401 MICOM TROUBLE IN Q953 TROUBLE IN P902 TROUBLE IN RL901 TROUBLE IN TH901 DEGAUSSING COIL NO DEGAUSSING DC 15V NO NO NO NO YES YES YES YES DEGAUSS ON THE OSD MENU MUST BE PRESSED 9 NO DEGAUSSING ...

Page 22: ... NO TILT NO ROTATION TROUBLE IN IC401 MICOM TROUBLE IN 15V LINE 6 3V LINE TROUBLE IN Q501 Q503 TROUBLE IN P501 TILT COIL NO YES YES YES CHECK 15V LINE AND 6 3V LINE CHECK Q503 COLLECTOR VOLTAGE NO NO CHECK IC401 PIN 21 WAVE FORM ...

Page 23: ...PRINTED CIRCUIT BOARD 23 1 MAIN BOARD Component Side ...

Page 24: ... 24 2 MAIN BOARD Solder Side ...

Page 25: ... 25 3 CONTROL BOARD Component Side 4 CONTROL BOARD Solder Side ...

Page 26: ...EXPLODED VIEW 26 2 5 6 9 10 11 3 8 1 4 7 A B C D ...

Page 27: ...T 037 M41QBF423X 31NPLD LG PHILIPS DISPLY 70KHZ 29 1MM KFB774F 025 CKD KFB774B TO42B36 B CKD PHP 5 20 FZMY GW18 NEW TYPE CET D COIL 0 5 130TS 1410 WITH PURITY FB770G FB774G CONTROL TOTAL BRAND CA 113 NT FB774B SCREW LEFT RIGHT PTP 4 10 MSWR FZMY FB774B BACK SIGNAL CAP PTP 4 10 MSWR FZMY FB774G KLCNET BRAND CA 113 TOTAL VIDEO F CHASSIS NT LOCAL BASE FB774G FB774G KLCNET BRAND CA 113 TOTAL Q ty 1 1 ...

Page 28: ...D 100V M FM5 TP 5 C329 181 288B MKT 100V 104JTR PHS26104 C330 181 288B MKT 100V 104JTR PHS26104 C331 181 288G MKT 100V 334JTR PHS26334 C332 181 288G MKT 100V 334JTR PHS26334 C333 181 288G MKT 100V 334JTR PHS26334 C334 181 288B MKT 100V 104JTR PHS26104 C335 181 288B MKT 100V 104JTR PHS26104 C336 181 288E MKT 100V 474JTR PHS 26474 C339 0CK4710W515 470P 500V K B TS C340 0CK1040K945 0 1UF 50V Z F TR C...

Page 29: ... 0CKZTTA003A SC E 222M 10 0FF7 250V TP7 5 SAMWHA Y2 C905 0CE476EK638 47UF KMG 50V M FM5 TP 5 C906 0CK1520K515 1500P 50V K B TS C908 181 124R 220UF SMG 25 4 40 400V M VNSN BULK C909 181 304T 273J 19 5 14 0 8 5 10 0 400V J PU FM10 C910 0CK33101515 330P 1KV K B TS C911 0CQ1021N419 1000P 100V J POLY NI TP C912 0CKZTTA003D SC SAMWHA 250V 1000F M TAPING 7 5 Y2 C913 0CKZTTA003D SC SAMWHA 250V 1000F M TAP...

Page 30: ...10A 60A 0 6U D710 0DR320400AA S3L20U 4004P15 BK SHINDENGEN NON 200V 3A 60A 35NSE D711 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 25NA 20V D712 0DR100009CA RGP10G TP GULF SEMICONDUCTOR LTD DO41 400V 1A 30A 100UA D714 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 25NA 20V D715 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 25NA 20V D716 0DR140059DA 1N4005TB52 TP LITEON DO41 600V 1A 40A SEC 5UA D717 0DR1400...

Page 31: ...524808B S524A60X81 DCB0 SAMSUNG ELECTRONICS 8DIP ST 8K EEPROM IC403 0IKE704200H KIA7042AP TO 92 TP 4 2 VOLT DETECTOR IC601 0IPH486600C TDA4866J 9P ST VERTICAL OUTPUT IC IC701 0IPRPPH005A TDA4841PS PHILIPS 32P SDIP ST IIC BUS H V SYNC PROCESSOR IC901 0IPMGSK005A STR G8656D LF1140 SANKEN 5P BK SWITCHING REGULATOR HYBRID IC Q204 0TR102009AJ KRC102S NPN SOT 23 TP KEC Q205 0TR102009AJ KRC102S NPN SOT 2...

Page 32: ...9 3 30K 1 4W 3 5 TA52 R305 0RD5601Q609 5 60K 1 4W 3 5 TA52 R306 0RD5601Q609 5 60K 1 4W 3 5 TA52 R307 0RD1004Q609 1M OHM 1 4 W 3 4 5 TA52 R310 0RD1001Q609 1K 1 4W 3 5 TA52 R312 0RD1001Q609 1K 1 4W 3 5 TA52 R314 0RD1000Q609 100 1 4W 3 5 TA52 R315 0RD1000Q609 100 1 4W 3 5 TA52 R316 0RD1000Q609 100 1 4W 3 5 TA52 R317 0RD1000Q609 100 1 4W 3 5 TA52 R318 0RD1000Q609 100 1 4W 3 5 TA52 R319 0RD4701Q609 4 7...

Page 33: ... 4W 3 5 TA52 R735 0RD1001Q609 1K 1 4W 3 5 TA52 R736 0RX1501J609 1 5KOHM 1 W 5 TA52 R737 0RN0560H609 0 56 1 2W 5 TA52 R738 0RN0560H609 0 56 1 2W 5 TA52 R740 0RD0271A609 2 7 OHM 1 2 W 7 0 5 TA52 R741 0RD1000Q609 100 1 4W 3 5 TA52 R742 0RD4702Q609 47K 1 4W 3 5 TA52 R743 0RD2201Q509 2 2K OHM 1 4 W 3 4 2 TA52 R744 0RD2200A609 220 OHM 1 2 W 7 0 5 TA52 R745 0RD4702Q609 47K 1 4W 3 5 TA52 R746 0RD2201Q609 ...

Page 34: ...1 6170TMZ132A EER3541 150UH V 16PIN EB770G SI SC NY JS STRG8654D TH901 6322TB4R51A J503P61D4R5Q270S JAHWA 4 5 ohm 30 20 264V TH902 6322TA080BA SCK 084 THINKING 8 ohm 15 264V X401 6202TTB003B HC 49 U HARMONY RADIAL 12MHZ 30PPM 22PF BK L901 6200TLS004B SQE2424 15MH 0 55MM 70T CB775C GM P301 6602T20009E SMAW200 06 YEONHO 2 0MM LOCK R A P302 6631T20008Q 14P H B 340MM UL1061 AWG 26 TWI CB777G P303 366 ...

Page 35: ...nfiguration 1 9 1 2 3 4 5 6 7 8 9 V 3 GND IN V 3 OUT V 2 OUT V 1 OUT V 2 IN V 1 IN VCC VBB LM2469 Monolothic Triple 9nS high Gain CRT Driver Connection Diagram 1 9 M24C08 Serial I2C BUS EEPROM SYMBOL E0 E2 SDA SCL WC Vcc Vss DESCRIPTION Chip Enable Input Serial Data Address Input Output Serial Clock Write Control Supply Voltage Ground 1 PSDIP8 BN 0 25mm Frame 8 1 1 SO8 MN 150mil Width TSSOP8 DW 16...

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Page 37: ...MAY 2002 P NO 3828TSL065R Printed in Korea ...