LG Flatron 774FT Service Manual
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LG Flatron 774FT Service Manual

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COLOR MONITOR

SERVICE MANUAL

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

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Summary of Contents for LG Flatron 774FT

  • Page 1: Color Monitor

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

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 TROUBLESHOOTING GUIDE ......13 SAFETY PRECAUTIONS ........3 PRINTED CIRCUIT BOARD........23 TIMING CHART ............4 EXPLODED VIEW........... 26 OPERATING INSTRUCTIONS ........ 5 REPLACEMENT PARTS LIST ....... 28 BLOCK DIAGRAM ........... 8 PIN CONFIGURATION........... 35 DESCRIPTION OF BLOCK DIAGRAM.....9 SCHEMATIC DIAGRAM .........

  • Page 3: Safety Precautions

    27kV. The following steps describe modify the original design without obtaining written how to measure the high voltage and how to prevent X- permission from LG or you will void the original parts and radiation. labor guarantee.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC Sync Video Blanking Back Front Frequency Sync Total MODE Resolution Active Sort Polarity Porch(F) Time(B) Duration(D) Porch(C) Period(E) Time(A) 640 X 480 6.35 0.51 3.81 37.50 20.32 2.03 26.67 75Hz 0.533 0.427 74.99 0.080 0.026 13.335 12.802 800 X 600 5.17...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW See Front Control Panel AC Power Socket Signal Cable Front Control Panel OSD Button Buttons SET Button Power Button Power Indicator <Shortcut Keys> • Brightness and Contrast can be adjusted directly without entering the On Screen Display (OSD) system.
  • Page 6 On-Screen-Display (OSD) Control Listed below are icons, icon names, and icon descriptions of the OSD menu. To adjust an image size, position, and operating parameters are quick and easy with the On-Screen- BRIGHTNESS CONTRAST Display control system, using the OSD button and the Adjustment control button.
  • Page 7 SIZE Video Level To select voltage level of the video card output - It is input level of the monitor. Most video cards are 0.7V. SIZE Language To choose the language in which the control names are displayed. OSD Menus are available in five languages. OSD TIME This item lets you adjust the OSD display time Vertical Size...

  • Page 8: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 8 -...

  • Page 9: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM vertical pulse by takijg the H and V sync signal. 1. Line Filter & Associated Circuit This circuit consists pof the TDA4841(IC701) and the This is used for suppressing noise of power input line associate circuit. flowing into the monitor and/or some noise generated in the monitor flowing out through the power input line.
  • Page 10 15.Image Rotation(Tilt)Circuit 17.Video Output AMP Circuit This circuit corrects the tilts of the screen by supplying This circuit amplifies the video signal which comes from the image rotation signal to the tilt which is attached tehe video pre-amp circuit and amplifies it to applied near the deflection yoke of the CRT.

  • Page 11: Adjustment

    ADJUSTMENT GENERAL INFORMATION condition. 10) Adjust balance of pin-balance as arrow keys to be All adjustment are thoroughly checked and corrected when the best condition. the monitor leaves the factory, but sometimes several 11) DIST.ADJ Æ FOS.ADJ command. adjustments may be required. ±...
  • Page 12 White Balance Meter with PC arrow keys. 4. Input EDID Data. 17-2)Display color 15,0 window pattern (70x70mm) at 1) Display color 15,0 cross hatch pattern at Mode 4. mode 4. 2) EEPROM Æ Write EDID command and confirm ± 1FL . 18) Adjust SUB-CONTRAST command to 50 "EDID Write OK "message of monitor.

  • Page 13: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE FUSE OK? (F901) CHECK C908 VOLTAGE? TROUBLE IN (AC120V: 170VDC, D900 AC220V: 310VDC) CHECK IC901 PIN 5 TROUBLE IN WAVEFORM (SQUARE WAVE IC901 COMES OUT?) CHECK TROUBLE IN D941, D942, D951, D941, D942, D951,...
  • Page 14 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 PIN 9 (5V) ? P302 5V LINE TROUBLE IN CHECK PC SIGNAL, IC302 PIN 5,6,7 ? P301 SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 18,19,20 ? IC302 CHECK TROUBLE IN IC303 PIN 4 (80V) P302 12V LINE/80V LINE 8 (12V) ? CHECK...
  • Page 15 3. NO RASTER NO VIDEO (POWER INDICATOR ON) CHECK ORANGE DPM MODE POWER INDICATOR (NO H and/or V SYNC) GREEN or ORANGE? GREEN CHECK TROUBLE IN D712 ANODE D712 (-157V)? CHECK TROUBLE IN G1 VOLTAGE? Q799 (-55~-150V) CHECK TROUBLE IN CDT HEAT VOLTAGE? D941,Q942,Q941 (6.3V)
  • Page 16 4. NO HORIZONTAL DEFLECTION NO H-DEFLECTION (ONE VERTICAL LINE) TROUBLE IN CHECK Q706? Q706 CHECK TROUBLE IN B + VOLTAGE 50V LINE (50V)? CHECK T701(FBT) PIN 2 TROUBLE IN (31KHZ 60V, Q719,Q720,D710 69KHZ 140V) ? CHECK TROUBLE IN Q701 COLLECTOR Q701 WAVEFORM? TROUBLE IN...
  • Page 17 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK IC401 TROUBLE IN PIN 17, 18, 19, IC401 (MICOM) 20, 21? CHECK TROUBLE IN Q711~Q716, Q711 ~ Q716, Q734~Q736, Q734~Q736, Q738 Q738? Cs SIGNAL TABLE TROUBLE IN RL701 HORIZONTAK FREQUENCY(fH) 66K ~ 39K 63K ~ 66K 57K ~ 63K 49K ~ 57K...
  • Page 18 6. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 2 Q601, Q602, Q603 (15V)? 15V LINE CHECK TROUBLE IN IC601 PIN 4 SMPS, D937 (-12V)? CHECK TROUBLE IN IC601 PIN 1 ? IC701 TROUBLE IN IC601, V-CIRCUIT - 18 -...
  • Page 19 7. TROUBLE IN OSD NO OSD (ENTER BUTTON MUST BE PRESSED.) CHECK TROUBLE IN IC301 B + ? 5V LINE DC 5V CHECK TROUBLE IN IC301 PIN 5, 10 IC601 PIN8 (V-FBP), WAVEFORM? T701 40V LINE Pin 10 Pin 5 CHECK TROUBLE IN IC301 PIN 12...
  • Page 20 8. TROUBLE IN DPM (NO DPM MODE.) DPM MODE FAILURE CHECK CHECK PC, IC401 (MICOM) INPUT H/V SYNC SIGNAL (PC IS NOT GOING INTO PIN 30,31 (H/V INPUT) DPM OFF MODE) SIGNAL? NO H/V SYNC CHECK TROUBLE IN IC401 PIN 13 X401 WAVEFORM? 6MHz...
  • Page 21 9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 19 IC401 (MICOM) (0V)? CHECK TROUBLE IN Q953 COLLECTOR Q953 VOLTAGE? DC 15V CHECK TROUBLE IN P902? P902 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901,...
  • Page 22 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN IC401 PIN 21 IC401 ( MI COM) WAVE FORM ? CHECK TROUBLE IN 15V LINE AND 6.3V LINE ? 15V LINE, 6.3V LINE CHECK TROUBLE IN Q503 COLLECTOR Q501~Q503 VOLTAGE ? TROUBLE IN...

  • Page 23: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) - 23 -...
  • Page 24 2. MAIN BOARD (Solder Side) - 24 -...
  • Page 25 3. CONTROL BOARD (Component Side) 4. CONTROL BOARD (Solder Side) - 25 -...
  • Page 26 - 26 -...

  • Page 27: Exploded View

    EXPLODED VIEW PARTS LIST Ref. No. Part No. Description Ref No. Q'ty 3091TKC039S FB774F BRAND NT 037 2423GC3E41M M41QBF423X 31NPLD LG-PHILIPS DISPLY 70KHZ 29.1MM 3809TKC023C KFB774F 025 CKD 3043TKK052C KFB774B TO42B36 B-CKD 339-002H PHP+5*20(FZMY)+GW18 NEW TYPE 6140TC2014B -CET D-COIL,0.5*130TS,1410,WITH PURITY,FB770G...

  • Page 28: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark AL ALTERNATIVE PARTS MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28 LOC NO PART NO. DESCRIPTION/SPECIFICATON *S *AL LOC. NO.
  • Page 29 MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28 PART NO. DESCRIPTION/SPECIFICATON LOC NO *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C721-1 181-477W 473J 19.5*15.0*8.5*7.5 250V J PU TP7.5 C941 0CE108EF630 1000UF KMG 16V M FM5 BULK C722 181-303W 0.2UF D 250V J PP NI FM20...
  • Page 30 MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28 PART NO. DESCRIPTION/SPECIFICATON LOC NO *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D205 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 200MW D712 0DR100009CA RGP10G TP GULF SEMICONDUCTOR LTD. 5.6V 5MA .PF...
  • Page 31 Q701 0TR200009AB KTC200-Y TP KEC TO92 NPN FB922 6210TCE003H BAS3510T BO SUNG 3510MM AXIAL52MM Q706 0TR558900BA “2SC5589(LG,W/M) BK TOSHIBA TO3P H- FB951 6210TCE003J BAS2550T BO SUNG 2550MM AXIAL52MM OUT TR 1500V 23A” L501 6210TCE003K BAS3550T BO SUNG 3550MM AXIAL52MM Q707...
  • Page 32 MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28 PART NO. DESCRIPTION/SPECIFICATON LOC NO *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RD0471Q609 4.70 1/4W(3 5% TA52 R317 0RD1000Q609 100 1/4W(3 5% TA52 0RD0242Q609 24 1/4W(3 5% TA52 R318...
  • Page 33 MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28 PART NO. DESCRIPTION/SPECIFICATON LOC NO *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R508 0RD4702Q609 47K 1/4W(3 5% TA52 R741 0RD1000Q609 100 1/4W(3 5% TA52 R509 0RD1502Q609 15K 1/4W(3 5% TA52...
  • Page 34 MODEL :FLATRON 774FT DATE:2002.05.28 MODEL: FLATRON 774FT DATE: 2002.05.28. LOC NO PART NO. DESCRIPTION/SPECIFICATON *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R906 0RD6200Q609 620 1/4W(3 5% TA52 4014TZZ001A 1.8*3.7 HANKOOK FBT R908 0RN0220H609 0.22 1/2W 5% TA52 4014TZZ001A 1.8*3.7 HANKOOK FBT...

  • Page 35: Pin Configuration

    PIN CONFIGURATION TDA4866J Current Driven Vertical Deflection Booster SYMBOL OUTB TDA4866J OUTB OUTA V FB GUARD OUTA FEEDB GUARD FEEDB Pin Configuration M24C08 Serial I C BUS EEPROM SYMBOL DESCRIPTION PSDIP8 (BN) 0.25mm Frame E0-E2 Chip Enable Input Serial Data Address Input/Output Serial Clock Write Control SO8 (MN)
  • Page 37 MAY. 2002 P/NO : 3828TSL065R Printed in Korea...

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