LG CB777G Service Manual

Chassis no. : ca-109

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-109

FACTORY MODEL: CB777G

MODEL: StudioWorks 700S

StudioWorks 700B

) ID LABEL Model No.

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

SELECT

Website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

(CB777G-NA),

StudioWorks 700E

(CB777G-EA)

(CB777G-AA)

Table of Contents

Summary of Contents for LG CB777G

Page 1: Color Monitor
Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-109 FACTORY MODEL: CB777G MODEL: StudioWorks 700S (CB777G-NA), StudioWorks 700E (CB777G-AA) StudioWorks 700B (CB777G-EA) ) 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 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 Blanking Time Back Porch Front Porch Mode Resolution Frequency Time (A) Sort Polarity –...
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 P702 P701 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) COIL COIL TILT DEGAUSSING - 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
± 0.005 on the White Balance 0.005 and y=0.298 1) Display cross hatch pattern at Mode 1. Meter with PC arrow keys. 2) Run alignment program for CB777G on the IBM ± 0.1FL of the 9) Adjust SUB-Brightness command to 0.4 compatible PC.
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 Max 127(7F) (decimal) position. 2) EEPROM Write EDID command and confirm 16) Set B-DRIVE to 100(64) 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 IC901 PIN 6 TROUBLE IN WAVEFORM (SQUARE WAVE IC901 COMES OUT?) CHECK TROUBLE IN D941, D942, D951, D961, D941, D942, D951,...
Page 14 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 P302 5V LINE PIN 9(5V) ? TROUBLE IN CHECK PC SIGNAL, IC302 PIN 5, 6, 7? P301 SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 20, 19, 18 ? IC302 CHECK TROUBLE IN IC303 PIN 4 (80V) P303 12V LINE/ PIN 8 (12V) ?
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 (-157V)? CHECK TROUBLE IN G1 VOLTAGE? Q799 (-55V~-150V) CHECK TROUBLE IN CDT HEAT D941, Q942, Q941 VOLTAGE? (6.3V)
Page 16: Vertical
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, Q720, D710 69KHZ 140V) ? CHECK TROUBLE IN Q701 COLLECTOR Q701 WAVEFORM?
Page 17: Horizontal
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) TROUBLE IN 30K ~ 33.9K C722, C723, C726, C729 34K ~ 38.9K 39K ~ 44.9K...
Page 18: Vertical
6. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 3 R603 15V LINE (15V)? TROUBLE IN CHECK HIGH-VOLTAGE OUT IC601 PIN 7 CIRCUIT(FBT), (40V)? D721, R606 CHECK TROUBLE IN IC701 PIN 12, 13? 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 PIN8 (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 31, 32 (H/V INPUT) DPM OFF MODE) SIGNAL? H/V SYNC CHECK TROUBLE IN IC401 PIN 13 X401 WAVEFORM? 24MHz...
Page 21: No Degaussing
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...
Page 22 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN IC401 PIN21 IC401 ( MI COM) WAVE FORM ? CHECK 15V 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 Parts List
6850TA9004A CABLE, D-SUB, UL 2990-9C(7.5) AT 1560MM GLAY CB777G DM 6871TST284C PWB(PCB) ASSEMBLY, SUB, CB777G CONTROL TOTAL BRAND LGEDI -S/W 700S(CB777G-NA), for Israel: S/W 700B (CB777G-EA) 6871TST284B PWB(PCB) ASSEMBLY, SUB, CB777G CONTROL TOTAL BRAND CA-109 -S/W 700B(CB777G-EA), S/W 700E(CB777G-AA) PWB(PCB) ASSEMBLY, SUB, CB777G CONTROL TOTAL BRAND CA-109 -For China:S/W 700S(CB777G-NA) 6871TST284D PWB(PCB) ASSEMBLY, SUB, CB777G.KQLBMS CONTROL TOTAL BRAND CA-112 -For Brazil: S/W 700S(CB777G-NA)
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. 01. 23. DATE: 2002. 01. 23. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
Page 26 DATE: 2002. 01. 23. DATE: 2002. 01. 23. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C750 0CK1040K945 0.1UF 50V Z F TR D701 0DS141489AB 1N4148 TP GRANDE DO-34 500M C751 181-288N MKT 100V 103JTR PHS86103...
Page 27: Vertical
DATE: 2002. 01. 23. DATE: 2002. 01. 23. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC304 0IPRPNS005A LM2480NA NATIONAL SEMICONDU Q715 0TR319809AA KTC3198-Y(KTC1815) TP KEC T IC401 0IZZTSZ169A SS 42PIN ST G-CHASSIS 6KEY Q716 0TR319809AA KTC3198-Y(KTC1815) TP KEC T...
Page 28 DATE: 2002. 01. 23. DATE: 2002. 01. 23. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R344 0RD0332Q609 33 1/4W(3 5% TA52 R711 0RD1000Q609 100 1/4W(3 5% TA52 R345 0RD0332Q609 33 1/4W(3 5% TA52 R712 0RD1001Q609...
Page 29 680 1/4W(3 5% TA52 SW207 140-058D SKHV10911A LGEC NON 12 20 H R793 0RD4702Q609 47K 1/4W(3 5% TA52 T701 6174T11003E “1054A,CB777G LG-PHILIPS 17””” R797 0RD1501Q609 1.50K 1/4W(3 5% TA52 T702 6170TCZ006A EE2218 2.3 MH D/FOCUS(CB775 R798 0RD2001Q609 2K 1/4W(3 5% TA52...
Page 30: 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 31 TDA4857 Autosync Deflection Controller HFLB FOCUS XRAY HSMOD HPLL2 BSENS HCAP HREF BDRV HBUF PGND HPLL1 HDRV SGND TDA4857 XSEL VCAP VREF EWDRV VAGC VOUT2 VSMOD VOUT1 VSYNC HSYNC CLBL HUNLOCK Pin Configuration SYMBOL DESCRIPTION SYMBOL DESCRIPTION Horizontal Flyback Input H-Synchronization Unlock/Protection/V-Blanking Output HFLB HUNLOCK...
Page 32: Schematic Diagram
SCHEMATIC DIAGRAM IIC-SDA IIC-SCL DDC-SDA DDC-SCL NOTICE Since this is a basic schematic diagram. The value of components and some partial connection are sucject to be changed for improvement without notice. - 32 - - 33 -...
Page 33: 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) - 34 - - 35 -...
Page 34 Feb. 2002 P/NO : 3828TSL080A Printed in Korea...

This manual is also suitable for:

Studioworks 700s Studioworks 700e Cb777g-aa Studioworks 700b Cb777g-ea Cb777g-na ... Show all