LG StudioWorks 575N Service Manual
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LG StudioWorks 575N Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-79
MODEL:
StudioWorks 575N, 575E, CB575C
ID LABEL: CB575C-NA (MPR-II), CB575C-EA (TCO-99)
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
Same looking with New Chassis
Issue Date: AUGUST 2000
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Summary of Contents for LG StudioWorks 575N

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-79 MODEL: StudioWorks 575N, 575E, CB575C ID LABEL: CB575C-NA (MPR-II), CB575C-EA (TCO-99) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Same looking with New Chassis Issue Date: AUGUST 2000...
  • Page 2 The Discrimination of Same Model Name *CA-65 LG Electronics Inc. StudioWorks 575N LG Twin Towers, 20, Yoido-Dong, Youngdungpo-Gu, Seoul, 150-721, Korea. Model No: CB575BN MODEL NO. : CB575BN POWER : AC100-240V Manufactured: Before August 2000 50/60Hz 1.5A LISTED 59B9 SERIAL NO.

  • Page 3: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....13 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............15 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......17 OPERATING INSTRUCTIONS ........ 5 PRINTED CIRCUIT BOARD........27 CONTROL LOCATIONS ......... 8 EXPLODED VIEW........... 31 WIRING DIAGRAM ..........9 REPLACEMENT PARTS LIST .......

  • Page 4: Safety Precautions

    24kV. 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 5: Timing Chart

    TIMING CHART VIDEO SYNC FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 — — Sync Polarity Frequency 53.674 63.981 68.677 46.875 37.50 31.469 Total Period 18.631 15.630 14.561 21.333 26.667 31.780 µs 14.222 11.852...

  • Page 6: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW ID Label See Front Control Panel Power ON/OFF Button AC Power Socket Signal Connector 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.
  • Page 7 On-Screen-Display (OSD) Control To adjust an image size, position, and operating Listed below are icons, icon names, and icon descriptions parameters are quick and easy with the On-Screen- of the OSD menu. Display control system, using the ENTER button and the OSD SET button.
  • Page 8 SETUP POSITION S E T U P S E T U P P O SI T I ON PO SIT I O N R G B V I E D O L E V E L 0 . 7 V V I E D O L E V E L 0 .7 V D D C O P T I O N...

  • Page 9: Control Locations

    CONTROL LOCATIONS CONTROL MAIN Ref. No. Control Function Control Function Ref. No. SW207 POWER BUTTON OSD SELECT/ADJUSTMENT(UP) SW203 SW205 OSD SELECT/ADJUSTMENT(DOWN) OSD BUTTON SW201 B + ADJUSTMENT SW206 OSD SELECT/ADJUSTMENT(RIGHT) VR901 SW204 SET BUTTON TCO ADJUSTMENT VR151 SW202 OSD SELECT/ADJUSTMENT(LEFT) TCO ADJUSTMENT VR152 - 8 -...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM P201 P501 P401 P151 P701 P702 P902 P402 Socket Signal Cable P301 P302 EARTH - 9 -...

  • Page 11: Disassembly

    DISASSEMBLY 2. BACK COVER REMOVAL 1. TILT/SWIVEL REMOVAL 1) Remove two screw caps (a). 1) Set the monitor face downward. 2) Remove four screws (b). 2) Pressing the latch (a), carefully remove 3) Remove signal cable cap (c). the Tilt/Swivel by pulling it upward. 4) Slide the Back Cover away from the Front Cabinet of the monitor.
  • Page 12 6. BOTTOM BRACKET REMOVAL 4. CONTROL PCB ASSEMBLY REMOVAL 1) Remove six screws (a). 1) Remove two screws (a). 2) Remove the Bottom Bracket. 2) Remove the Control PCB Assembly from the Front Cabinet. 5. VIDEO PCB ASSEMBLY REMOVAL 1) Disconnect P301, P302 from the Video PCB. 2) Remove four screws (a).

  • Page 13: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 12 -...

  • Page 14: 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 15 14. H & V Blanking and Brightness Control. 16. Video Pre-Amp Circuit. Blanking circuit eliminates retrace line by supplying This circuit amplifies the analog video signal from 0-0.7V negative pulse to the G1 of the CRT. And Brightness to 0-4V. It is operated by taking the clamp, R, G, B drive circuit is used for control of the screen brightness by and contrast signal from the Micom(IC401).

  • Page 16: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 8) Adjust balance of side-pincushion as arrow keys to be the best condition. when the monitor leaves the factory, but sometimes 9) DIST. ADJ. → BALANCE command. several adjustments may be required. 10) Adjust parallelogram as arrow keys to be the best Adjustment should be following procedure and after condition.
  • Page 17 14) Adjust R-DRIVE and B-DRIVE command to white ± 1FL of the luminance. 18) Adjust ABL to 34 balance x=0.283 ± 0.003 and y=0.298 ± 0.003 on the 19) Exit from the program. White Balance Meter with PC arrow keys. ±...

  • Page 18: 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, D901, D902, D903, D904 AC220V: 304VDC) CHECK IC901 PIN 6 TROUBLE IN WAVEFORM (SQUARE WAVE IC901 COMES OUT?) CHECK TROUBLE IN...
  • Page 19 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 P302 6.3V LINE PIN 20(6.3V) ? 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 4 (105V) P303 15V LINE/ PIN 8 (15V) ?
  • Page 20 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? Q704 (-35~-15V) CHECK TROUBLE IN CDT HEAT D941, Q942, Q941 VOLTAGE? (6.3V)
  • Page 21 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 70V, Q719, Q720, D710 69KHZ 143V) ? CHECK TROUBLE IN Q705 COLLECTOR Q705 WAVEFORM?
  • Page 22 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 22, 23, 24 ? CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAK FREQUENCY(fH) TROUBLE IN 29K ~ 35.9K C722, C723, C726, C729 36K ~ 38.9K 39K ~ 48.9K...
  • Page 23 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 - 22 -...
  • Page 24 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 (H-FBP) Pin 10 Pin 5 CHECK TROUBLE IN IC311 PIN 12...
  • Page 25 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? H/V SYNC CHECK TROUBLE IN IC401 PIN 6 X401 WAVEFORM? 6MHz...
  • Page 26 9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 31 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 27 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN Q504(COLLECTOR) IC401 ( MI COM) WAVE FORM ? CHECK TROUBLE IN 15V LINE 15V LINE, 6.3V LINE AND 6.3V LINE ? CHECK TROUBLE IN Q503 EMITTER Q501~Q503 VOLTAGE ? TROUBLE IN P501, TILT COIL, D501...

  • Page 28: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) - 27 -...
  • Page 29 2. MAIN BOARD (Solder Side) - 28 -...
  • Page 30 3. VIDEO BOARD (Component Side) 4. VIDEO BOARD (Solder Side) - 29 -...
  • Page 31 5. CONTROL BOARD (Component Side) 6. CONTROL BOARD (Solder Side) - 30 -...
  • Page 32 - 31 -...

  • Page 33: Exploded View

    MAIN TOTAL ASS’Y(TCO-99) FOR 575E 3313T15063D VIDEO PCB ASS’Y 6871TVT175C MAIN PCB ASS’Y(MPR-II) FOR 575N 6871TMT175C MAIN PCB ASS’Y(TCO-99) FOR 575E 6871TMT175D * Remark ‘L’ are local sourcing parts in Indonesia factory(LGEDI) of the LG Electronics Inc. - 32 -...
  • Page 34 COMPARISON TABLE StudioWorks 575E (TCO-99) StudioWorks 575N (MPR-II) Description Description LOC.No Part No. Part No. CDT, M36LBL803X 49NLAA 2423GB0A33A 2423GB0A8BG CDT, M36LBL803X 49NLLD 3091TKB026U CABINET ASS’Y 3091TKB026E CABINET ASS’Y MAIN TOTAL ASS’Y 3313T15063D 3313T15063C MAIN TOTAL ASS’Y BACK COVER ASS’Y...

  • Page 35: 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: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK...
  • Page 36 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C703 0CZZTFT001Z CAPACITOR, ECQB1H104JM3 104J 50V TP5.0 MATSUSHITA C704 0CZZTFT001F CAPACITOR, ECQB1H332JM3 332J 50V TP5.0 MATSUSHITA C705 0CE476CF638 CAPACITOR, AL.ELECTROLYTIC, 47UF SHL,SD 16V M FM5 TP 5...
  • Page 37 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C943 0CK3310W515 CAPACITOR, CERAMIC (HIGH DIELECTRIC), 330P 500V K B TS C944 0CKZTTA003A CAPACITOR, CERAMIC (HIGH DIELECTRIC), SC E 222M 10.0FF7 250V TP7.5 C951 0CE108CH630 CAPACITOR, AL.ELECTROLYTIC, 1000UF SHL 25V M FM5 BULK...
  • Page 38 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK D941 0DD150009CB DIODE, RECTIFIER, RGP15D TP G.I DO204AC 200V 1.5A 50A 150NS 5UA D951 0DR302800AA DIODE, RECTIFIER, GUF30F(28A-M) BK GULF SEMICONDUCTOR LTD. D952 0DS113309AA DIODE, SWITCHING, 1SS133 TP ROHM KOREA DO34 90V 0.4A 0.6A 4.0N...
  • Page 39 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK FB403 6210TCE003J CORE (CIRC), BEAD, BAS2550T BO SUNG 2550MM AXIAL52MM FB501 6210TCE003B CORE (CIRC), BEAD, BRS3580B BO SUNG 3580MM RADIAL FB502 6210TCE003B CORE (CIRC), BEAD, BRS3580B BO SUNG 3580MM RADIAL...
  • Page 40 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R204 0RD8200Q609 RESISTOR, FIXED CARBON FILM, 820 1/4W(3 5% TA52 R205 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R206 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52...
  • Page 41 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R421 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R422 0RD4701Q609 RESISTOR, FIXED CARBON FILM, 4.70K 1/4W(3 5% TA52 R424 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52...
  • Page 42 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R750 0RD3001Q609 RESISTOR, FIXED CARBON FILM, 3K 1/4W(3 5% TA52 R751 0RD1004Q609 RESISTOR, FIXED CARBON FILM, 1M OHM 1/4 W (3.4) 5% TA52 R752 0RD2201Q609 RESISTOR, FIXED CARBON FILM, 2.20K 1/4W(3 5% TA52...
  • Page 43 MODEL: StudioWorks 575N/575E DATE: 2000. 8. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R916 0RD1002Q609 RESISTOR, FIXED CARBON FILM, 10K 1/4W(3 5% TA52 R918 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R919 0RD1501Q609 RESISTOR, FIXED CARBON FILM, 1.50K 1/4W(3 5% TA52...

  • Page 44: 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 DESCRIPTION DESCRIPTION SYMBOL SYMBOL Horizontal Flyback Input H-Synchronization Unlock/Protection/V-Blanking Output HFLB...
  • Page 45 BLOCK DIAGRAM FOR TDA4856 - 44 -...
  • Page 46 M24C08 8K SERIAL I C BUS EEPROM PIN NAME FUNCTION E0-E2 Chip Enable Inputs Serial Data Address Input/Output Serial Clock Write Control Supply Voltage M2404C08 Ground Pin Configuration KA3842B Current-Mode PWM Controller BLOCK DIAGRAM SET/ RESET U.V.L.O. INTERNAL LOGLC BIAS PWR VC 1/2 V C.S.
  • Page 47 TDA4866 Current Driven Vertical Deflection Booster SYMBOL OUTB TDA4866 OUTB OUTA GUARD OUTA FEEDB GUARD Pin Configuration FEEDB BLOCK DIAGRAM GUARD Output TDA4866 GUARD FLYBACK CIRCUIT GENERATOR OUTA AMPLIFLER A vertical deflection FEEDB coil INPUT STAGE PROTECTION OUTB AMPLIFLER B from e.g.
  • Page 48 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 THERMAL 1: Input PROTECTION 2: GND 3: Output TT2062 Very-High Definition CRT Display Horizontal Deflection Output Absolute Maximum Ratings at Ta=25°C Parameter Symbol...
  • Page 49 TYPE PARTS TYPE PARTS KTA1275 2N3904 KTC3206 KTD1413 IRFS630A KSB564AC KTC200-Y KTC3198 KIA7042AP DTC114E 1: GND 1: Vcc 2: OUT 2: GND 3: IN 3: OUT - 48 -...
  • Page 50 PACKING AND ACCESSORIES Power Cord Owner’s Manual Top Packing Bottom Packing - 49 -...

  • Page 51: Schematic Diagram

    3.40V 85.2V 50.4V 15.6V 1.88V...
  • Page 52 Jul. 2000 P/NO : 3828TSL047A Printed in Korea...

This manual is also suitable for:

Cb575c-naCb575c-eaStudioworks 575eStudioworks cb575c

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