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LG EV700 Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-65
MODEL: EV700, CG771B
ID LABEL: EV700A
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG EV700

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-65 MODEL: EV700, CG771B ID LABEL: EV700A CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....12 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............14 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......16 OPERATING INSTRUCTIONS ........ 5 PRINTED CIRCUIT BOARD........26 CONTROL LOCATIONS ......... 7 EXPLODED VIEW........... 30 WIRING DIAGRAM ..........8 REPLACEMENT PARTS LIST .......

  • 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 parts properly there is no possibility of an X-radiation problem.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9 – – Sync Polarity – – Frequency 31.469 37.500 31.470 37.879 46.875 48.363 60.023 63.981 68.677...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW ID Label AC Power Socket Signal Cable Power (DPMS) Indicator Power ON/OFF Button Front Control Panel 2. Power (DPMS) Indicator 3. OSD Select/Adjustment 1. Power ON/OFF Button 1. Power ON/OFF Button 3. OSD Select/Adjustment This button is used to turn the monitor ON and OFF.
  • Page 6 On Screen Display (OSD) Control Icon Description To adjust an image size, position, and operating Mode Recall: To recall factory preset mode. parameters are quick and easy with the On Screen Display control system, using the OSD Select/Adjustment knob. A Advanced Option: There are four kinds of options.

  • Page 7: Control Locations

    CONTROL LOCATIONS CONTROL MAIN Ref. No. Control Function Ref. No. Control Function SW201 POWER SWITCH VR701 HIGHT-VOLTAGE ADJUSTMENT B + ADJUSTMENT VR201 OSD SELECT/ADJUSTMENT VR901 VR101 TCO ADJUSTMENT - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM CONTROL P201 P101 P102 P401 P501 P902 P903 P402 P703 P702 Socket Signal Cable P302 P301 P304 P303 - 8 -...

  • Page 9: Disassembly

    DISASSEMBLY 3. TOTAL CHASSIS ASSEMBLY REMOVAL 1. TILT/SWIVEL REMOVAL 1) Disconnect P902 (Degaussing pin), P701, P601 1) Set the monitor face downward. (DY pin), and P501(Tilt pin). 2) Pressing the latch (a), carefully remove the 2) Remove two screws (a) from the Total Chassis Tilt/Swivel by pulling it upward.
  • Page 10 5. BOTTOM BRACKET REMOVAL 6. MAIN BOARD ASSEMBLY REMOVAL 1) Remove three screws (a). 1) Remove three screws (a). 2) Remove four screws (b). 2) Remove three screws (b). 3) Remove the Bottom Bracket. 3) Release two latches (c) from the Main Board Assembly.

  • Page 11: Block Diagram

    Sense <OSD DISPLAY> Heater ( 6.3V ) CONTRAST Signal H-Sync Sig BRIGHTNESS Cable VIDEO VIDEO V-Sync Sig H-SIZE PRE-AMP MAIN AMP H-POSITION C DATA(SDA) (IC302) (IC303) V-SIZE C CLOCK(SCL) V-POSITION S-PCC 125V TRAP MICOM OSD IC 8V REG. CUT OFF DEGAUSS (IC401) (IC303)

  • Page 12: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 5. Micom(Microprocessor) Circuit. This is used for suppressing noise of power input line The operating procedure of Micom(Microprocessor) and flowing into the monitor and/or some noise generated in its associated circuit is as follows: this monitor flowing out through the power input line.
  • Page 13 11. High Voltage Output & FBT(Flyback Transformer). 16. Image Rotation (Tilt) Circuit. The high voltage output circuit is used for generating This circuit corrects the tilt of the screen by supplying the pulse to the primary coil of the FBT(Flyback Transformer image rotation signal to the tilt coil which is attached near (T701)).

  • Page 14: Adjustment

    12) DRIVE ADJ command. 1) Display cross hatch pattern at Mode 1. 13) Set B-DRIVE to 155(170, LGE CDT) (decimal) at 2) Run alignment program for EV700 on the IBM DRIVE of the alignment program. compatible PC. - 14 -...
  • Page 15 14) Adjust R-DRIVE and G-DRIVE command to white 18) Adjust ABL to 41 ± 1FL of the luminance. ± 0.003 and y=0.311 ± 0.003 on the balance x=0.281 19) Exit from the program. White Balance Meter with PC arrow keys. 5.

  • Page 16: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE FUSE OK? (F901) CHECK C907 VOLTAGE? TROUBLE IN (AC120V: 170VDC, D901, D902, D903, D904 AC220V: 310VDC) CHECK IC901 PIN 3 TROUBLE IN WAVEFORM (SQUARE WAVE IC901, IC902 COMES OUT?) CHECK TROUBLE IN...
  • Page 17 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 PIN 7, 15, 18, P302 12V LINE, IC304 21(8V) ? TROUBLE IN CHECK PC SIGNAL, IC302 PIN 6, 8, 10 ? P301 SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 16, 19, 22 ? IC302 CHECK TROUBLE IN...
  • Page 18 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 (-120V)? CHECK TROUBLE IN G1 VOLTAGE? Q801~Q806 (-10~20V) TROUBLE IN D926, Q925 (6.3V) - 18 -...
  • Page 19 4. NO HORIZONTAL DEFLECTION NO H-DEFLECTION (ONE VERTICAL LINE) CHECK TROUBLE IN Q706? Q706 CHECK B + VOLTAGE TROUBLE IN 160V LINE (160V)? CHECK TROUBLE IN T701(FBT) PIN 3 Q717, Q718, Q719, (31KHZ 70V, D707 69KHZ 140V) ? CHECK TROUBLE IN Q705 COLLECTOR Q705 WAVEFORM?
  • Page 20 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK IC401 TROUBLE IN PIN 18, 19, 20? IC401 (MICOM) CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(f TROUBLE IN 30K ~ 38.9K L720, R744 39K ~ 47.4K 47.5K ~ 61.9K 62K ~ 70K...

  • Page 21: No Vertical Deflection

    6. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 3 R603, Q601~Q603, (15V)? 15V LINE CHECK TROUBLE IN IC601 PIN 7 HIGH-VOLTAGE OUT (40V)? CIRCUIT, D713 CHECK TROUBLE IN IC701 PIN 12, 13? IC701 TROUBLE IN IC601, V-CIRCUIT - 21 -...
  • Page 22 7. TROUBLE IN OSD (ENTER BUTTON MUST BE PRESSED.) NO OSD 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 IC311 PIN 12...
  • Page 23 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 1, 42 (H/V INPUT) DPM OFF MODE) SIGNAL? NO H/V SYNC CHECK TROUBLE IN IC401 PIN 6 X401 WAVEFORM? 6MHz...

  • Page 24: No Degaussing

    9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 22 IC401 (MICOM) (0V)? CHECK Q921 COLLECTOR TROUBLE IN VOLTAGE? Q921 DC 5V (15V) CHECK TROUBLE IN P902, P903? P902, P903 CHECK TROUBLE IN RL901? RL901...
  • Page 25 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN Q504 IC401 ( MI COM) WAVE FORM ? CHECK TROUBLE IN 15V LINE AND 15V LINE, 6.3V LINE 6.3V LINE ? CHECK TROUBLE IN Q503 EMITTER Q501~Q503 VOLTAGE ? TROUBLE IN P501, TILT COIL...

  • Page 26: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) - 26 -...
  • Page 27 2. MAIN BOARD (Solder Side) - 27 -...
  • Page 28 3. VIDEO BOARD (Component Side) 4. VIDEO BOARD (Solder Side) - 28 -...
  • Page 29 5. CONTROL BOARD (Component Side) 6. CONTROL BOARD (Solder Side) - 29 -...

  • Page 30: Exploded View

    EXPLODED VIEW...

  • Page 31: Exploded View Parts List

    PCB ASS'Y, VIDEO BOARD, TOSHIBA CDT 3313T17033B CHASSIS ASS'Y, MAIN TOTAL, Northern Hemisphere 3313T17033F CHASSIS ASS'Y, MAIN TOTAL, Southern Hemisphere 3313T17033C CHASSIS ASS'Y, MAIN TOTAL, Northern TOSHIBA CDT * Remark ‘L’ are local sourcing parts in factory of the LG Electronics Inc. - 31 -...

  • Page 32: 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: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK...
  • Page 33 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C706 181-288B CAPACITOR, POLYESTER, MKT 100V 104JTR PHS26104 C707 0CZZTFT002B CAPACITOR, ECQV1H154JZ3 154J 50V TP5.0 MATSUSHITA C707 181-288Q CAPACITOR, POLYESTER, MKT 100V 154JTR PHS26154 C708 0CE108CH618 CAPACITOR, AL.ELECTROLYTIC, 1000UF SHL 25V M FL TP5...
  • Page 34 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C749 0CK56101515 CAPACITOR, CERAMIC (HIGH DIELECTRIC), 560P 1KV K B TS C750 0CE2256K618 CAPACITOR, AL.ELECTROLYTIC, 2.2U SMS 50V M FM5 TP5 C751 0CE1066F618 CAPACITOR, AL.ELECTROLYTIC, 10UF SMS 16V M FL TP5...
  • Page 35 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK D702 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A D703 0DR400500AA DIODE, RECTIFIER, SB40-05J BK SANYO TO-220ML 50V 4A D704 0DD300000AB DIODE, RECTIFIER, FMP-3FU BK SANKEN TO3PF 1500V 5A...
  • Page 36 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK D911 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A D919 0DR140059DA DIODE, RECTIFIER, 1N4005TB52 TP LITEON DO41 600V 1A 40A D919 0DD400509AA DIODE, RECTIFIER, 1N4005 GP TP G.I DO204AL 600V 1A 30A...
  • Page 37 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK IC923 0ISS780500F IC, SAMSUNG ELECTRONICS, KA7805 IC925 0ISS781200F IC, SAMSUNG ELECTRONICS, KA7812 COILs & COREs FB401 125-155J CORE (CIRC), BEAD, BFS2550A0FG SAMWHA 2.5*5.0MM FB401 6210TCT003J CORE (CIRC), BEAD, HF55 TDK-K 2.6*6.0MM AXIAL52MM...
  • Page 38 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK Q708 0TR564009AB TRANSISTOR, KSB564AC-YTA TP SANSUNG TO92 PNP Q708 0TR127009AA TRANSISTOR, KTA1270-Y(KTA562TM) TP KEC TO92 PNP Q709 0TR141300AB TRANSISTOR, KTD1413 BK KEC TO220IS NPN Q710...
  • Page 39 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK Q805 0TR102409AB TRANSISTOR, KTA1024-Y(KTA949) TP KEC TO92L PNP Q806 0TR945009AA TRANSISTOR, KSC945C-Y TP SAMSUNG TO92 NPN EPI. Q806 0TR319809AA TRANSISTOR, KTC3198-Y(KTC1815) TP KEC TO92 NPN...
  • Page 40 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R410 0RD1801Q609 RESISTOR, FIXED CARBON FILM, 1.80K 1/4W(3 5% TA52 R411 0RD4701Q609 RESISTOR, FIXED CARBON FILM, 4.70K 1/4W(3 5% TA52 R412 0RD1500Q609 RESISTOR, FIXED CARBON FILM, 150 1/4W(3 5% TA52...
  • Page 41 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R709 0RD2202Q609 RESISTOR, FIXED CARBON FILM, 22K 1/4W(3 5% TA52 R710 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52 R711 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52...
  • Page 42 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R758 0RD5601Q609 RESISTOR, FIXED CARBON FILM, 5.60K 1/4W(3 5% TA52 R759 0RN0270H609 RESISTOR, FIXED METAL FILM, 0.27 1/2W 5 TA52 R760 0RD5601Q609 RESISTOR, FIXED CARBON FILM, 5.60K 1/4W(3 5% TA52...
  • Page 43 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R809 0RD1003Q609 RESISTOR, FIXED CARBON FILM, 100K 1/4W(3 5% TA52 R810 0RD1502Q609 RESISTOR, FIXED CARBON FILM, 15K 1/4W(3 5% TA52 R811 0RD1503Q609 RESISTOR, FIXED CARBON FILM, 150K 1/4W(3 5% TA52...
  • Page 44 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R939 0RD0472Q609 RESISTOR, FIXED CARBON FILM, 47 1/4W(3 5% TA52 R941 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R942 0RD0472A609 RESISTOR, FIXED CARBON FILM, 47 OHM 1/2 W (7.0) 5% TA52...
  • Page 45 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C316 0CH3104K946 CAPACITOR, CHIP[CERAMIC LD-LESS HD], 100000PF 50V Z C317 0CH3104K946 CAPACITOR, CHIP[CERAMIC LD-LESS HD], 100000PF 50V Z C318 0CE476CN618 CAPACITOR, AL.ELECTROLYTIC, 47UF SHL 100V M FL TP5...
  • Page 46 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK D305 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A D306 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A D307 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A...
  • Page 47 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK FB311 6210TCT003G CORE (CIRC), BEAD, ZBF505S-02TA-K TDK-K 3.5*5.0MM FB312 125-155J CORE (CIRC), BEAD, BFS2550A0FG SAMWHA 2.5*5.0MM FB312 6210TCT003J CORE (CIRC), BEAD, HF55 TDK-K 2.6*6.0MM AXIAL52MM...
  • Page 48 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R313 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52 R314 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R315 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52...
  • Page 49 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R361 0RH5600D622 RESISTOR, CHIP, 560 1/10W 5 D.R/TP R362 0RH5101D622 RESISTOR, CHIP, 5.1K 1/10W 5 D.R/TP R363 0RH2702D622 RESISTOR, CHIP, 27K 1/10W 5 D.R/TP R364...
  • Page 50 MODEL: EV700 DATE: 1999. 3. 16. AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK MISCELLANEOUS 2423GC0B88G CDT SET,ITC, M41LFQ803X 46SLAA, SOUTHERN HEMISPHER 2423GC0B89Z CDT SET, ITC, M41LFQ803X 46NLAA, NORTHERN HEMISPHERE 6318TT1705B CDT(CIRC), M41LLJ107XX517(F5), TOSHIBA 70KHZ C/EARTH 6868T17003C CDT EARTH, CB770 TIN WIRE BRAID(128)

  • Page 51: Pin Configuration

    PIN CONFIGURATION TDA4856 Autosync Deflection Controller HFLB FOCUS XRAY HSMOD HPLL2 BSENS HCAP HREF BDRV HBUF PGND HPLL1 SGND HDRY TDA4856 VCAP XSEL VREF EWDRV VAGC VOUT2 VSMOD VOUT1 ASCOR VSYNC HSYNC CLBL HUNLOCK Pin Configuration SYMBOL DESCRIPTION SYMBOL DESCRIPTION Horizontal Flyback Input H-Synchronization Unlock/Protection/V-Blanking Output HFLB...
  • Page 52 EHT compensation via vertical size EHT compensation 1.2V via horizontal size 22 kΩ VSMOD HSMOD EWDRV VERTICAL EW-OUTPUT OUT2 V-SYNC INPUT V-OUTPUT EHT COMPENSATION V-SYNC V-sync OSCILLATOR AND POLARITY H-PINCUSHION INTEGRATOR H-SIZE AND V-SIZE V-LINEARITY AND AGC CORRECTION (TTL level) H-CORNER OUT1 V-LINEARITY BALANCE...

  • Page 53: Pin Configuration

    LSC4543 CMOS Graphic Monitor On-Screen Display SS(A) VCO(PCI) RP(NC) DD(A) HFLB(NC) FBKG VSYNC (MOSI) (SCK) Pin Configuration BLOCK DIAGRAM HORD VERO DISPLAY MEMORY OSD_EN SHADOW BSEN CONTROL X32B REGISTERS VPOL HPOL SDA(M0SI) and DATA DATA WADDR SCL(SCK) DATA RECEIVER MANAGEMENT MBUS/SPI WCOLOR CONTROL...
  • Page 54 TDA4866 Current Driven Vertical Deflection Booster SYMBOL DESCRIPTION Input A Input B Supply Voltage OUTB TDA4866 OUTB Output B OUTA Ground (Mounting Base) GUARD OUTA Output A FEEDB Flyback Supply Voltage GUARD Guard Output Pin Configuration FEEDB Feedback Input GUARD BLOCK DIAGRAM Output TDA4866...
  • Page 55 KA7805 (KA7808, KA7812) Positive Voltage Regulator 5V (8V, 12V) BLOCK DIAGRAM SERIES INPUT OUTPUT PASS ELEMENT CURRENT GENERATOR PROTECTION STARTING REFERENCE ERROR CIRCUIT VOLTAGE AMPLIFIER 1: Input THERMAL 2: GND PROTECTION 3: Output AT24C08 2-Wire Serial CMOS EEPROM PIN NAME FUNCTION A0 to A2 Address Inputs...
  • Page 56 TYPE PARTS TYPE PARTS KTA1270 2N3904 KTC200-Y KTC3198 KTC3202 KSB564AC KTA1024 KTA1275 KTC3206 KTC3207 KTD1413 BU2527AX DTC114E FS12KMA 1: GND 2: OUT 3: IN KSA1013 KIA431 Programmable Shunt Regulator) Cathode 1: REFERENCE 2: ANODE 2.5V Reference 3: CATHODE Anode (A) - 56 -...

  • Page 58: Schematic Diagram

    Mar. 1999 P/NO : 3828TSO011C Printed in Korea...

This manual is also suitable for:

Cg771b

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