Table of Contents
Related Manuals for LG EB990G-EL
Summary of Contents for LG EB990G-EL
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Page 1: Color Monitor
COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-111 FACTORY MODEL: EB990G MODEL: StudioWorks E900B (EB990G-EL) StudioWorks E900B (EB990G-ES) E900B (EB990G-EL) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MENU SELECT... -
Page 2: Table Of Contents
CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....10 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............12 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......14 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW..........21 CONTROL LOCATIONS ......... 6 REPLACEMENT PARTS LIST ......23 WIRING DIAGRAM .......... -
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 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 MENU SELECT Power ON/OFF Button AC Power Socket See Front Control Panel Signal Connector Front Control Panel MENU Button SELECT Button Power (DPMS) Indicator MENU SELECT Power Button Buttons 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: Control Locations
VR801 : High Voltage Adjustment (27kV) VR901: B Adjustment (190V Line) -
Page 7: Wiring Diagram
Anode Cap DY-Pin DY Assembly Screw P701 P901 P201- P702 (Control PCB) P401 P451 P402... -
Page 8: 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 9: Block Diagram
SIGNAL INPUT TRANS (T903) -
Page 10: 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 reaches up to about 30kV (abnormal state), H.V control (IC802) detects. - Page 11 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 (Q801). 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.
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Page 12: Adjustment
ADJUSTMENT GENERAL INFORMATION 3) EEPROM → ALL CLEAR → Y(Yes) command. All adjustment are thoroughly checked and corrected <Caution> Do not run this procedure unless the when the monitor leaves the factory, but sometimes EEPROM is changed. All data in EEPROM (mode several adjustments may be required. - Page 13 ± 0.1FL of 5. Input EDID Data. 11) Adjust SUB-Brightness command to 0.4 1) Display color 15,0 cross hatch pattern at Mode 4. the raster luminance. 2) EEPROM → Write EDID command and confirm 12) Display color 15,0 box pattern(70x70mm) at mode “EDID Write OK!!”...
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Page 14: Troubleshooting Guide
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) CHECK TROUBLE IN D901 BRIDGE DIODE BRIDGE DIODE? (D901) CHECK C905(+) VOLTAGE TROUBLE IN 145VDC at 110V input IC901 310VDC at 220V input CHECK TROUBLE IN D924, D926, D923,... - Page 15 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5, 6, 7 ? PC SIGNAL CHECK TROUBLE IN IC302 PIN 18, 19, 20, IC302, P302 PIN 9 (5V) ? CHECK IC303 PIN 1, 3, 5 TROUBLE IN PIN10 (12V), IC303 PIN 6 (80V) ?
- Page 16 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or AMBER) CHECK AMBER POWER INDICATOR TROUBLE IN GREEN or AMBER ? P302 SIGNAL CABLE GREEN MIN. ROTATE SCREEN CHECK (Counter-clockwise) CONTROL KNOB TO SCREEN CONTROL CLOCKWISE KNOB OF FBT CHECK VOLTAGE AT D924/D926 CATHODE (190V) TROUBLE IN PRIMARY D923 CATHODE (80V)
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Page 17: No Vertical Deflection
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 7 T701 PIN 4, D704 (40V)? CHECK TROUBLE IN IC701 PIN 13 IC701 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT... - Page 18 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 40, 41 (H/V INPUT) DPM MODE) SIGNAL? INPUT H/V SYNC CHECK TROUBLE IN IC401 PIN 9, 8 X401, IC401 WAVEFORM? CHECK...
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Page 19: No Degaussing
6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 6 IC401 (MICOM) (5V)? CHECK TROUBLE IN Q920 COLLECTOR D925 VOLTAGE (0.5V)? CHECK TROUBLE IN P901? P901 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901, DEGAUSSING COIL... - Page 20 7. TROUBLE IN OSD NO OSD CHECK TROUBLE IN IC301 PIN 4 P302 (5V) ? CHECK IC301 PIN 5 TROUBLE IN (NEGATIVE H-PULSE P302 COMES IN ?) CHECK IC301 PIN 10 TROUBLE IN (V-PULSE COMES IN?) P302 CHECK IC301 PIN 13, 14, 15 TROUBLE IN (IS THERE ANY SIGNAL IC301, IC401...
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Page 21: Exploded View
EXPLODED VIEW... -
Page 22: Exploded View Parts List
MAIN TOTAL ASSEMBLY EB990G BRAND CA-111 FOR EUROPE (EB990G-ES) 6871TVT283A PWB(PCB) ASSEMBLY,VIDEO, EB990G VIDEO TOTAL BRAND CA-111 6871TMT299F PWB(PCB) ASSEMBLY,MAIN, EB990G ALEUE BRAND CA-111 TOTAL FOR EUROPE (EB990G-EL) 6871TMT299C PWB(PCB) ASSEMBLY,MAIN, EB990G ALMXE BRAND CA-111 TOTAL FOR MEXICO (EB990G-EL) 6871TMT299E PWB(PCB) ASSEMBLY,MAIN, EB990G ALUKE BRAND CA-111 TOTAL FOR U.K (EB990G-EL) -
Page 23: 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. 5. 21. DATE: 2002. 5. 21. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. - Page 24 DATE: 2002. 5. 21. DATE: 2002. 5. 21. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs C818 181-288J MKT 100V 563JTR PHS26563 C819 181-477U 333J 19.5*13.0*7.5*7.5 250V J D201 0DL305029BA LTL-305DJ-0C2 TP LITEON GREEN/ C821...
- Page 25 COILs & COREs Q725-R 0TRFC10001A FAIRCHILD KSC5042F-YDTU ST TO2 Q771 0TR920009AB KSP92 TP SAMSUNG TO92 HIGH VOL L304 0LA1000K119 100UH K 2.3*3.4 TP Q801 0TR558900BA 2SC5589(LG,W/M) BK TOSHIBA TO3 L305 0LA0390K119 0.39UH K 2.3*3.4 TP Q802 0TR471009AA KSD471AC-Y TP SAMSUNG TO92 NP...
- Page 26 DATE: 2002. 5. 21. DATE: 2002. 5. 21. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q803 0TR564009AB KSB564AC-YTA TP SANSUNG TO92 P R326 0RD1000Q609 100 1/4W(3 5% TA52 Q806 0TR471009AA KSD471AC-Y TP SAMSUNG TO92 NP R327...
- Page 27 820KOHM 1/4 W (3.4) 5% TA52 R808 0RD1001Q609 1K 1/4W(3 5% TA52 R916 0RD8203Q609 820KOHM 1/4 W (3.4) 5% TA52 R809 0RN3902F409 39K 1/6W 1% TA52 (EB990G-EL) R917 0RD1000Q609 100 1/4W(3 5% TA52 R809 0RN5102F409 51K OHM 1/6 W 1.00% TA52 (EB990G-ES) R918 0RD1003Q609...
- Page 28 DATE: 2002. 5. 21. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R920 0RD0332Q609 33 1/4W(3 5% TA52 R921 0RD0332Q609 33 1/4W(3 5% TA52 R922 0RD5101Q609 5.10K 1/4W(3 5% TA52 R925 0RD1001Q609 1K 1/4W(3 5% TA52 R926 0RD4701Q609 4.70K 1/4W(3 5% TA52 R928 0RX0331K607 3.3 OHM 2 W 5% TA62...
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Page 29: Pin Configuration
PIN CONFIGURATION TDA4866J Current Driven Vertical Deflection Booster SYMBOL OUTB TDA4866J OUTB OUTA V FB GUARD OUTA FEEDB GUARD FEEDB M62501P /FP Teerminal Number and The facillty PIN CONFIGURATION(TOP VIEW) PIN NO. Symbol Functional Description PWM output terminal PWM OUT Power supply terminal Trigger Input terminal PWM OUT... - Page 31 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side)