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LG Flatron F775FT Service Manual
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LG Flatron F775FT Service Manual

Color monitor
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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-124
FACTORY MODEL: FB775H
MODEL:
*(
) ID LABEL Model No.
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
F775FT(FB775H-EL)

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Summary of Contents for LG Flatron F775FT

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-124 FACTORY MODEL: FB775H MODEL: F775FT(FB775H-EL) ) ID LABEL Model No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....9 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............11 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......13 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW........... 23 CONTROL LOCATION ..........6 REPLACEMENT PARTS LIST ....... 25 WIRING DIAGRAM ..........

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS SAFETY-RELATED COMPONENT WARNING! X-RADIATION There are special components used in this color monitor The only potential source of X-radiation is the picture tube. which are important for safety. These parts are marked However, when the high voltage circuitry is operating on the schematic diagram and the replacement properly there is no possibility of an X-radiation problem.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Sync Duration Front Porch Blanking Time Back Porch Mode Resolution Frequency Time (B) Polarity Sort –...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW Power Button AC Power Socket See Front Control Panel Signal Cable Front Control Panel 3. SET Button 1. Power ON/OFF Button This button to enter a selection in the on screen display. This button is used to turn the monitor ON and OFF. 4.

  • Page 6: Control Location

    CONTROL LOCATIONS VR901: B Adjustment (50V Line) - 6 -...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM Anode Cap DY-Pin Degaussibg Coil P801 P902 P702 P201- (Control PCB) P502 P405 P501 P402 - 7 -...

  • Page 8: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen(G2) - 8 -...

  • Page 9: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 6. Horizontal and Vertical Oscillation. This is used for suppressing noise of power input line This circuit generates the horizontal pulse and the vertical flowing into the monitor and/or some noise generated in pulse by taking the H and V sync signal.
  • Page 10 15. Image Rotation (Tilt) Circuit. 17. Video Output Amp Circuit. This circuit corrects the tilt of the screen by supplying the This circuit amplifies the video signal which comes from image rotation signal to the tilt coil which is attached near the video pre-amp circuit and amplified it to applied the the deflection yoke of the CRT.

  • Page 11: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 10) Adjust balance of pin-balance as arrow keys to be when the monitor leaves the factory, but sometimes the best condition. 11) DIST. ADJ. → FOS. ADJ command. several adjustments may be required. Adjustment should be following procedure and after 12) Adjust V-SIZE as arrow keys to 230 ±...
  • Page 12 4. Input EDID Data. 17-1) Adjust R-DRIVE and G-DRIVE command to white 1) Display color 15,0 cross hatch pattern at Mode 4. ± 0.003 and y=0.298 ± 0.003 on the balance x=0.283 2) EEPROM → Write EDID command and confirm White Balance Meter with PC arrow keys.

  • 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: 160VDC, D900 AC220V: 304VDC) CHECK Q901 PIN 6 TROUBLE IN WAVEFORM (SQUARE WAVE Q901 COMES OUT?) CHECK TROUBLE IN D941, D942, D951, D941, D942,...
  • Page 14 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 P302 5V LINE PIN 7(5V) ? TROUBLE IN CHECK PC SIGNAL, IC302 PIN 1, 3, 5? P301 SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 14, 16, 18 ? IC302 CHECK TROUBLE IN IC303 PIN 7 (105V) P303 12V LINE/ PIN 3 (13V) ?
  • Page 15 3. NO RASTER NO VIDEO (POWER INDICATOR ON) CHECK AMBER DPM MODE POWER INDICATOR (NO H and/or V SYNC) GREEN or AMBER? GREEN CHECK TROUBLE IN D712 ANODE D712 (-160V)? CHECK TROUBLE IN G1 VOLTAGE? Q799 (-55V~ -15V) CHECK TROUBLE IN CDT HEAT D941, Q942, Q941 VOLTAGE? (6.3V)
  • Page 16 4. NO HORIZONTAL DEFLECTION NO H-DEFLECTION (ONE VERTICAL LINE) CHECK TROUBLE IN Q706? Q706 CHECK TROUBLE IN B + VOLTAGE 50V LINE (50V)? CHECK T701(FBT) PIN 2 TROUBLE IN (31KHZ 60V, Q719, Q703, D704, D710 69KHZ 140V) ? CHECK TROUBLE IN Q705 COLLECTOR Q705 WAVEFORM?
  • Page 17 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 5, 6, 7 ? CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) 30K ~ 33.9K TROUBLE IN 34K ~ 38.9K C722, C723, C726, C729 39K ~ 44.9K...
  • Page 18 6. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 2 D610 13V+ LINE (13V+)? CHECK TROUBLE IN IC701 PIN 23? IC701 TROUBLE IN IC601, V-CIRCUIT - 18 -...
  • Page 19 7. TROUBLE IN OSD (ENTER BUTTON MUST BE PRESSED.) NO OSD CHECK TROUBLE IN IC301 B + 5V LINE (5V) ? DC 5V CHECK TROUBLE IN IC301 PIN 5, 10 IC601 PIN1 (V-FBP), WAVEFORM? T701 40V LINE (H-FBP) Pin 10 Pin 5 CHECK TROUBLE IN...
  • Page 20 8. TROUBLE IN DPM (NO OFF MODE.) OFF 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? H/V SYNC CHECK TROUBLE IN IC401 PIN 13 X401 WAVEFORM? 24MHz...
  • Page 21 9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 1 IC401 (MICOM) (0V)? CHECK TROUBLE IN Q953 COLLECTOR Q953 (15V) VOLTAGE? DC 15V CHECK TROUBLE IN P902 ? P902 CHECK TROUBLE IN RL901? RL901 TROUBLE IN...
  • Page 22 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN IC401 PIN21 IC401 ( MI COM) WAVE FORM ? CHECK 13V LINE TROUBLE IN 15V LINE, 6.3V LINE AND 6.3V LINE ? CHECK TROUBLE IN Q503 EMITTER Q501~Q503 VOLTAGE ? TROUBLE IN...
  • Page 23 - 23 -...

  • Page 24: Exploded View

    Description 3091TKC071K CABINET ASSEMBLY, FB775G BRAND 035 CKD 6318L17013A CDT(CIRC), M41QBF423X 41NPLD LG-PHILIPS 70KHZ 29.1MM FLATRON TCO -For Northern Hemisphere 6318L17013B CDT(CIRC), M41QBF423X 41QPLD LG-PHILIPS 70KHZ 29.1MM FLATRON TCO -For Equatorial 3809TKC032A BACK COVER ASSEMBLY, FB795C 031 C-CORE SLIM -For Europe, ASIA...

  • Page 25: 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 DATE: 2003. 01 . 13. DATE: 2003. 01 . 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 26 DATE: 2003. 01 . 13. DATE: 2003. 01 . 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D309 0DS124409AA 1SS244 TP ROHM KOREA C750 0CK1040K945 0.1UF 50V Z F TR C751 181-288J MKT 100V 563JTR PHS26563...
  • Page 27 DATE: 2003. 01 . 13. DATE: 2003. 01 . 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D971 0DR100009DA RGP10J TP GULF SEMICONDUCTOR L705 6140TBZ026C DR15*18-C9.8 100UH 0.1*30MM 4 ZD201 0DZ560009AG GDZJ5.6B TP GRANDE DO-34 500M...
  • Page 28 DATE: 2003. 01 . 13. DATE: 2003. 01 . 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R434 0RD1000Q609 100 1/4W(3 5% TA52 R304 0RD3001Q609 3K 1/4W(3 5% TA52 R305 0RD1001Q609 1K 1/4W(3 5% TA52...
  • Page 29 DATE: 2003. 01 . 13. DATE: 2003. 01 . 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R803 0RD2001Q609 2K 1/4W(3 5% TA52 R727-1 0RX0242K665 24 OHM 2 W 5% SF R728 0RD1001Q609 1K 1/4W(3 5% TA52...
  • Page 30 SKHV10911A LGEC NON 12 20 HOR SW206 140-058D SKHV10911A LGEC NON 12 20 HOR SW207 140-058D SKHV10911A LGEC NON 12 20 HOR T701 6174T11004A “1055A, CB777H LG-PHILIPS 17””/” T702 6170TCZ013A EI2218 26UH D/FOCUS,FB775G T703 6170TCZ001D EI2218 4.0MH H-DRIVE,EB770G T901 6170TMZ138A...

  • Page 31: Pin Configuration

    PIN CONFIGURATION LOW-COST I 2 C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITORS STV6888 - 31 -...
  • Page 32 STV6888 Block Diagram - 32 -...
  • Page 33 STV9211 Pin Configuration Pin Description - 33 -...
  • Page 34 BLOCK DIAGRAM STV9211 - 34 -...
  • Page 35 STV9556 Pin Configuration OUT1 OUT2 OUT3 GNDP GNDS GNDA BLOCK DIAGRAM - 35 -...

  • Page 36: Schematic Diagram

    SCHEMATIC DIAGRAM NOTICE Since this is a basic schematic diagram. DDC-SDA IIC-SDA The value of components and some partial connection are IIC-SCL DDC-SCL sucject to be changed for improvement without notice. 1050V - 36 - - 37 -...
  • Page 37 PRINTED CIRCUIT BOARD 2. CONTROL BOARD (Solder Side) 1. CONTROL BOARD (Component Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) - 37 - - 38 -...
  • Page 38 Jan. 2003 P/NO : 3828TSL091K Printed in Korea...

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