LG CB777H-ML Service Manual
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LG CB777H-ML Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CA-119
FACTORY MODEL: CB777H
MODEL: StudioWorks 700S
StudioWorks 700B
*(
) ID LABEL Model No.
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MENU
SELECT
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
(CB777H-ML), (CB777H-SL)
(CB777H-EL)
*Same looking with new chassis.
Issue Date; 2002. 10.

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  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-119 FACTORY MODEL: CB777H MODEL: StudioWorks 700S (CB777H-ML), (CB777H-SL) StudioWorks 700B (CB777H-EL) ) ID LABEL Model No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MENU SELECT *Same looking with new chassis.

  • Page 2: Table Of Contents

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

  • 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 Resolution Mode Frequency Time (B) Polarity Sort –...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW ID Label MENU SELECT Power ON/OFF Button See Front Control Panel AC Power Socket Signal Connector Front Control Panel MENU SELECT Button 1. Power ON/OFF Button Use these buttons to choose or adjust items in the on Use this button to turn the monitor ON or OFF.

  • Page 6: Wiring Diagram

    WIRING DIAGRAM P201 P402 P405 P501 P701 S + S P702 Socket P902 Signal Cable P302 P301 - 6 -...

  • Page 7: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL & BACK COVER REMOVAL 1) Set the monitor face downward. 2) Pull the latch (a), carefully remove the Tilt/Swivel by pulling it upward. 3) Pressing the latch (b), Back cover by pushing it upward. 4) Release the latch (c). 5) Slide the Back Cover away from the Front Cabinet of the monitor.

  • 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 7) Adjust tilt as arrow keys to be the best condition. All adjustment are thoroughly checked and corrected 8) DIST. ADJ. → BALANCE command. when the monitor leaves the factory, but sometimes several adjustments may be required. 9) Adjust parallelogram as arrow keys to be the best Adjustment should be following procedure and after condition.
  • Page 12 14) Set Brightness and Contrast to Max position. 5. Input EDID Data. 1) Display color 15,0 cross hatch pattern at Mode 4. 15) Set SUB-CONTRAST 200(C8) (decimal) position. 2) EEPROM → Write EDID command and confirm 16) Set B-DRIVE to 150(96) at DRIVE of the alignment “EDID Write OK!!”...

  • 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 TROUBLE IN Q901 PIN 6 Q901 WAVEFORM CHECK TROUBLE IN D941, D942, D941, D942, D951, D951, D961, D971 D961, D971...
  • 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, Q704, 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 ~ 43.9K...
  • 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 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

    SOCKET(CIRC), POWER, BAE EUN AC UNIVERSAL 3PIN BLACK -For World wide: (CB777H-ML) 6620TKB002A 6620TKB002B SOCKET(CIRC), POWER, SA-4S HUA JIE AC UNIVERSAL 3PIN BLACK -For Europe, U.K:(CB777H-EL), USA, Canada:(CB777H-ML), Mexico: (CB777H-SL) 6850TA9009A CABLE, D-SUB, UL2990-9C(5.8) AT 1560MM GRAY(85964) EB770H DM 6850TA9009B CABLE, D-SUB, UL2990-9C(5.8) AT 1560MM GRAY(85964) EB770H GM...

  • 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: 2002. 9. 27. DATE: 2002. 9. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 26 DATE: 2002. 9. 27. DATE: 2002. 9. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C904 0CKZTTA003A SC E 222M 10.0FF7 250V TP7 D718 0DR140059DA 1N4005TB52 TP LITEON DO41 C905 0CKZTTA003A SC E 222M 10.0FF7 250V TP7...
  • Page 27 DATE: 2002. 9. 27. DATE: 2002. 9. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION FB701 6210TCE003L BAS3580T BO SUNG 3580MM AX R209 0RD9100Q609 910 1/4W(3 5% TA52 FB703 6210TCE003B BRS3580B BO SUNG 3580MM RA R210...
  • Page 28 DATE: 2002. 9. 27. DATE: 2002. 9. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R433 0RD1000Q609 100 1/4W(3 5% TA52 R743 0RD4701Q609 4.70K 1/4W(3 5% TA52 R434 0RD1000Q609 100 1/4W(3 5% TA52 R744 0RD2700A609...
  • Page 29 DATE: 2002. 9. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R918 0RD1001Q609 1K 1/4W(3 5% TA52 R923 0RD1003Q609 100K 1/4W(3 5% TA52 R925 0RB0180K607 0.18OHM 2 W 5% TA62 R926 0RD4301Q609 4.30K 1/4W(3 5% TA52 R927 0RD2002Q609 20K 1/4W(3 5% TA52 R928 0RD1800Q609...

  • Page 30: Pin Configuration

    PIN CONFIGURATION LOW-COST I 2 C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITORS STV6888 - 30 -...
  • Page 31 STV6888 Block Diagram - 31 -...
  • Page 32 STV9211 Pin Configuration Pin Description - 32 -...
  • Page 33 BLOCK DIAGRAM STV9211 - 33 -...
  • Page 34 STV9556 Pin Configuration OUT1 OUT2 OUT3 GNDP GNDS GNDA BLOCK DIAGRAM - 38 -...

  • Page 35: Schematic Diagram

    SCHEMATIC DIAGRAM DDC-SDA IIC-SDA DDC-SCL IIC-SCL - 34 - - 35 -...

  • Page 36: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) - 36 - - 37 -...
  • Page 37 Oct. 2002 P/NO : 3828TSL091D Printed in Korea...

This manual is also suitable for:

Studioworks 700bStudioworks 700sCb777h-slCb777h-el

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