LG CS990D-EP Service Manual
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LG CS990D-EP Service Manual

LG CS990D-EP Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-84
FACTORY MODEL: CS990D
MODEL: (CS990D-EP)
*(
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
) ID LABEL Model No.

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Summary of Contents for LG CS990D-EP

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-84 FACTORY MODEL: CS990D MODEL: (CS990D-EP) ) 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....15 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............17 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......19 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW........... 27 CONTROL LOCATIONS ......... 9 REPLACEMENT PARTS LIST ....... 29 WIRING DIAGRAM ..........

  • Page 3: Safety Precautions

    26kV. 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 4: Timing Chart

    TIMING CHART VIDEO SYNC FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 VESA Sync Polarity – Frequency 43.269 53.674 68.677 91.146 93.750 µs Total Period 23.112 18.631 14.561 10.971 10.666 µs Video Active Time 17.778 14.222 10.836...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW ID Label Power ON/OFF Button AC Power Socket See Front Control Panel D-Sub Signal Connector Power (DPMS) Indicator Front Control Panel Power Indicator ENTER Button EXIT Button Power Button OSD Select/Adjustment Brightness Contrast 1. Power ON/OFF Button Contrast Control This button is used to turn the monitor ON and OFF.
  • Page 6 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-Display of the OSD menu. control system, using the ENTER ( ) button and the OSD Select/Adjustment ( ) button.
  • Page 7 TRAPEZOID V MOIRE Reduce vertical moire when interference patterns of To correct geometric distortion. dark steady wary lines appear on your screen. The moire adjustments may affect the focus of the 4 3 . 2 k H z / 8 5 H z screen.
  • Page 8 RECALL DEGAUSS To manually demagnetize the screen which may You can use this function when you want to go back show some image or color incorrectly. to the screen display of the time you purchased the product after adjusting to modify it in the Preset Mode.

  • Page 9: Control Locations

    CONTROL LOCATIONS MAIN CONTROL Ref. No. Control Function Ref. No. Control Function SW201 POWER BUTTON SW202 OSD BUTTON VR202 CONTRAST ADJUSTMENT SW203 OSD EXIT BUTTON B + ADJUSTMENT VR201 BRIGHTNESS ADJUSTMENT VR901 SW205 OSD SELECT/ADJUSTMENT RIGHT VR701 HIGH-VOLTAGE ADJUSTMENT SW204 OSD SELECT/ADJUSTMENT LEFT - 9 -...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM DY Assembly Screw Anode Cap DY-Pin P305 P301 P302 P308 P303 P304 Degaussing Coil CDT Earth P701 P901 P801 P702-1 P702 P401 P902 P402 P203 P202 P201 - 10 -...

  • Page 11: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL REMOVAL 1) Set the monitor face downward. 2) Remove two screws (a). 3) Pressing the latch (b), carefully remove the Tilt/Swivel by pulling it upward. 2. BACK COVER REMOVAL 1) Remove two screw caps (a). 2) Remove four screws (b). 3) Slide the Back Cover away from the Front Cabinet of the monitor.
  • Page 12 4. TOTAL CHASSIS ASSEMBLY REMOVAL 1) Disconnect P901 (Degaussing pin), P701 (DY pin) and P402, P801 from the Main PCB. 2) Disconnect CDT Earth Pin, P303, P304 from the Video PCB. 3) Disconnect Pin (c) from the DY Assembly screw. 4) Carefully separate the CDT Board Assembly from the CDT neck.
  • Page 13 6. BOTTOM BRACKET REMOVAL 5. CONTROL PCB ASSEMBLY REMOVAL 1) Remove two screws (a). 1) Remove three screws (a). 2) Remove two screws (b). 2) Remove the Control PCB Assembly 3) Remove screw (c) and Metal Fix. from the Front Cabinet. 4) Remove the Bottom Bracket.

  • Page 14: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 14 -...

  • Page 15: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 5. X-ray Protection. This is used for suppressing noise of power input line This circuit detects the rectified DC voltage comes flowing into the monitor and/or some noise generated from the FBT pin 4. If the high voltage of the FBT in this monitor flowing out through the power input line.
  • Page 16 11. D/D Drive & Convert Circuit. 19. Image Rotation (Tilt) Circuit. This circuit is used for supplying B + voltage to This circuit corrects the tilt of the screen by supplying horizontal deflection output transistor (Q709). This the image rotation signal to the tilt coil which is circuit makes to add side-pincushion correcting signal attached to the CDT near the deflection.

  • Page 17: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 6) Adjust H-POSITION as arrow keys to center of the when the monitor leaves the factory, but sometimes screen. several adjustments may be required. 7) Adjust H-SIZE as arrow keys to 350 ± 2mm. Adjustment should be following procedure and after 8) Adjust V-POSITION as arrow keys to center of the warming up for a minimum of 30 minutes.
  • Page 18 16) Adjust SUB-CONTRAST command to 47 ± 1FL of 6. Adjustment for Focus. the color 15,0 window pattern (70x70mm) 1) Display H character in full screen at Mode 4. luminance at Mode 4. 2) Adjust two Focus control on the FBT that focus 17) Display color 15,0 full white patten at Mode 4.

  • Page 19: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) CHECK TROUBLE IN C907 (+) VOLTAGE? IC901 (310VDC) CHECK D902, D903, D904 TROUBLE IN VOLTAGE? D902, D903, D904 - 19 -...
  • Page 20 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 PIN 3, 8, 12 (12V), P302, PIN 17 (5V)? 5V, 12V LINE TROUBLE IN CHECK IC302 PIN 2, 6, 11 ? PC SIGNAL, SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 29, 32, 35 ? IC302 CHECK TROUBLE IN...
  • Page 21 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or ORANGE) CHECK ORANGE POWER INDICATOR TROUBLE IN GREEN or ORANGE ? P402 SIGNAL CABLE GREEN MIN. ROTATE SCREEN CHECK (Counter-clockwise) CONTROL KNOB TO SCREEN CONTROL CLOCKWISE KNOB OF FBT CHECK VOLTAGE AT D912 CATHODE (190V) TROUBLE IN PRIMARY D909 CATHODE (80V)
  • Page 22 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 2 T901 PIN 15 (15V) ? CHECK TROUBLE IN IC601 PIN 4 T901 PIN 17 (-12V)? CHECK TROUBLE IN IC701 PIN 12 IC701 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT - 22 -...
  • Page 23 5. TROUBLE IN DPM STAND-BY/SUSPEND/ OFF MODE FAILURE CHECK CHECK PC, IC401 (MICOM) NO H / V SYNC SIGNAL (PC IS NOT GOING INTO PIN 42, 1 (H/V INPUT) DPM MODE) SIGNAL? INPUT H/V SYNC CHECK TROUBLE IN IC401 PIN 6, 7 X401, IC401 WAVEFORM? CHECK...
  • Page 24 6. NO DEGAUSSING BUTTON MUST BE PRESSED.) NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 14 IC401 (MICOM) (5V)? CHECK TROUBLE IN Q908 COLLECTOR D914 VOLTAGE (0.5V)? CHECK TROUBLE IN P901? P901 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901, DEGAUSSING COIL - 24 -...
  • Page 25 7. NO TILT (ROTATION ) NO TILT (ROTATION) CHECK TROUBLE IN C335 VOLTAGE D913 (12V) ? CHECK TROUBLE IN Q315 ? Q315 CHECK TROUBLE IN IC301 ? IC301 (OSD IC) TROUBLE IN P303, TILT COIL CONNECTOR, TILT COIL - 25 -...
  • Page 26 8. TROUBLE IN OSD NO OSD CHECK TROUBLE IN IC301 PIN 4, 17 P302 (5V) ? CHECK IC301 PIN 5 TROUBLE IN (NEGATIVE H-PULSE P302 COMES IN ?) CHECK IC301 PIN 18 TROUBLE IN (NEGATIVE V-PULSE P302 COMES IN?) CHECK IC301 PIN 13, 14, 15 TROUBLE IN (IS THERE ANY SIGNAL...

  • Page 27: Exploded View

    EXPLODED VIEW...

  • Page 28: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Ref. No. Part No. Description 3091TKC060A CABINET ASS’Y, CS990D BRAND TKC018A 85964 2423GG2E91R CDT SET, M46QCG903X 02NPLD 6868T19001F CDT EARTH, CB995D TIN WIRE BRAID(128) 339-002H SCREW ASS’Y, PHP+5*20(FZMY)+GW18 NEW TYPE 4951TKS045C METAL ASS’Y, FRAME(CG991C) 6140TC2006A COIL,DEGAUSSING FRAME SIDE CG991 6174T11002C FBT (FLY BACK TRANSFORMER), Y268069(HFL1127RD) HITACHI 19"...

  • Page 29: 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: CS990D-EP DATE: 2000. 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK CAPACITORs...
  • Page 30 MODEL: CS990D DATE: 2000. 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C360 0CH3104K946 CAPACITOR, CHIP, [CERAMIC LD-LESS HD], 100000PF 50V Z F 2012 R/TP C361 0CK3320W515 CAPACITOR, CERAMIC, (HIGH DIELECTRIC), 3300P 500V K B C362 0CH3104K946 CAPACITOR, CHIP, [CERAMIC LD-LESS HD], 100000PF 50V Z F 2012 R/TP C363 0CE226EN638 CAPACITOR, AL.ELECTROLYTIC, 22UF KMG 100V M FM5 TP 5...
  • Page 31 MODEL: CS990D DATE: 2000. 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C714 181-477U CAPACITOR, POLYPROPYLENE, 333J 19.5*13.0*7.5*7.5 250V J PU TP7.5 C715 0CE476CR618 CAPACITOR, AL.ELECTROLYTIC, 47UF SHL,SD 250V M FL TP 5 C718 181-303B CAPACITOR, POLYPROPYLENE, 124J 20.5*19.0*11.0*10.0 250V J PU FM10 C719 181-305N CAPACITOR, POLYPROPYLENE, 105J 26.0*22.5*14.0*15.0 250V J MPP FM15...
  • Page 32 MODEL: CS990D DATE: 2000. 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK C912 0CE107BK638 CAPACITOR, AL.ELECTROLYTIC, 100UF KME 50V M FM5 TP5 C913 0CE227CR650 CAPACITOR, AL.ELECTROLYTIC, 220UF SHL 250V M FM7.5 BULK C914 0CE107CP630 CAPACITOR, AL.ELECTROLYTIC, 100UF SHL 160V M FM5 BULK C915 181-308V CAPACITOR, POLYPROPYLENE, 393J 20.0*21.0*13.5*10.0 630V J PU FM10...
  • Page 33 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK D719 0DD245620AA DIODE, RECTIFIER, 2NH45(LC6-20) BK TOSHIBA DO201AD 1000V 2A 50A 75 D720 0DD245620AA DIODE, RECTIFIER, 2NH45(LC6-20) BK TOSHIBA DO201AD 1000V 2A 50A 75 D721 0DD400709CB DIODE, RECTIFIER, UF4007 TP G.I DO204AL 1000V 1A 30A 75NS 10UA D722 0DD400709CB...
  • Page 34 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK IC302 0IMI527430B IC, MITSUBISHI, M52743BSP 36P,SDIP BK 3CH VIDEO PREAMP IC303 0INS240200C IC, NATIONAL SEMICONDUCTOR, LM2402T 11P BK MONO. TRIPLE 3.5NSEC IC401 0IZZTSZ105A IC, DRAWING, MC68HC08BD48 42 PIN BK . IC402 0IAL240800A IC, ATMEL, AT24C08 8D EEPROM(8K,IIC)
  • Page 35 TRANSISTOR, KSB564AC-YTA TP SANSUNG TO92 PNP Q707 0TR216101AA TRANSISTOR, KTD2161-Y ST KEC TO220AB NPN TR Q708 0TR558900BA TRANSISTOR, 2SC5589(LG,W/M) BK TOSHIBA TO3P H-OUT TR 1500V 23A Q711 0TR200009AB TRANSISTOR, KTC200-Y TP KEC TO92 NPN Q718 0TF640000CA FET, IRFS640A BK SAMSUNG 200V 9A TO220F...
  • Page 36 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R314 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R315 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52 R316 0RH3300D622 RESISTOR, CHIP, 330 1/10W 5 D.R/TP R317 0RH3300D622 RESISTOR, CHIP, 330 1/10W 5 D.R/TP...
  • Page 37 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R389 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R390 0RD1001Q609 RESISTOR, FIXED CARBON FILM, 1K 1/4W(3 5% TA52 R391 0RN0560H609 RESISTOR, FIXED METAL FILM, 56 1/2W 5 TA52 R392 0RX1302J609 RESISTOR, SMALL FIX METAL FILM OXIDE, 13KOHM 1 W 5% TA52...
  • Page 38 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R712 0RD1000Q609 RESISTOR, FIXED CARBON FILM, 100 1/4W(3 5% TA52 R713 0RD0471Q609 RESISTOR, FIXED CARBON FILM, 4.70 1/4W(3 5% TA52 R714 0RD5601Q609 RESISTOR, FIXED CARBON FILM, 5.60K 1/4W(3 5% TA52 R715 0RD3301Q609 RESISTOR, FIXED CARBON FILM, 3.30K 1/4W(3 5% TA52...
  • Page 39 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK R810 971-0054 WIRE, JUMP, TIN 50MM TAPING R811 0RD9100Q609 RESISTOR, FIXED CARBON FILM, 910 1/4W(3 5% TA52 R812 0RX1503K607 RESISTOR, SMALL FIX METAL FILM OXIDE, 150K OHM 2 W 5% TA62 R813 0RD4302Q609 RESISTOR, FIXED CARBON FILM, 43K 1/4W(3 5% TA52...
  • Page 40 MODEL: CS990D DATE: 200 12. 19. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION REMARK SC901 6200TJB003B FILTER, (CIRC),EMI, BNS-02AA2LR-3 BAE EUN CB995C SG301 6918TAT005E SPARK GAP, AXIAL, MTAS-201M GIGA AXIAL TAPING SG302 6918TAT005E SPARK GAP, AXIAL, MTAS-201M GIGA AXIAL TAPING SG303 6918TAT005E SPARK GAP, AXIAL, MTAS-201M GIGA AXIAL TAPING...

  • Page 41: 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 42 M52743BSP C Bus Controlled 3-Channel Video Preamplifier PIN CONFIGURATION (TOP VIEW) OSD BLK IN OUTPUT(R) INPUT(R) EXT FEED BACK(R) OSD IN(R) GND2 OUTPUT(G) GND 1(R) INPUT(G) EXT FEED BACK(G) INPUT(SOG) MAIN BRIGHTNESS OUTPUT(B) M52743BSP OSD IN(G) EXT FEED BACK(B) GND 1(G) RETRACE BLK IN INPUT(B) D/A OUT 1...
  • Page 43 KA358 Dual Operational Amplifier KA431/A BLOCK DIAGRAM AT24C08 8D EEPROM AT24C08 Pin Configuration - 43 -...
  • Page 44 KA7812, 7805 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 TDA8172 Vertical Deflection Output Circuit NON-INVERTING INPUT OUTPUT STAGE SUPPLY OUYPUT GROUND FLYBACK GENERATOR...
  • Page 45 TYPE PARTS TYPE PARTS 2SC4633 IRFS640A IRFS630A KSB564AC 2N3904 KTA1270 KTC3198 KTC3202 KTC200-Y KTA1275 KTC3206 KTC3207 KSA1013 - 45 -...

  • Page 46: Schematic Diagram

    - 46 - - 47 -...

  • Page 47: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) 2. MAIN BOARD (Solder Side) 3. VIDEO BOARD (Component Side) 4. VIDEO BOARD (Solder Side) 5. CONTROL BOARD (Component Side) 6. CONTROL BOARD (Solder Side)
  • Page 48 PACKING AND ACCESSORIES Owner's Manual Signal Cable Power Cord Top Packing Bottom Packing i d e - 50 -...
  • Page 49 Jan. 2001 P/NO : 3828TSL038M Printed in Korea...

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