LG Flatron F720P Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Monitor
  5. FLATRON F720P
  6. Service manual

LG Flatron F720P Service Manual

Hide thumbs Also See for Flatron F720P:
Table of Contents

Advertisement

Quick Links

COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-127
MODEL:
(
) **Same model for SVC
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
F720P
(F720PK-AL**Q)
*Same looking with new chassis.
Issue Date; 2003. 12.

Advertisement

Table of Contents
loading

Related Manuals for LG Flatron F720P

Summary of Contents for LG Flatron F720P

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-127 MODEL: F720P (F720PK-AL**Q) ) **Same model for SVC CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *Same looking with new chassis. Issue Date; 2003. 12.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....11 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............13 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......15 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW..........21 CONTROL LOCATIONS ......... 7 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

    OPERAT ING INST RUCT IONS F RONT V IEW REA R V IEW AC Power Socket Power B utton See F ront Control Panel D-Sub Signal Connector F ront Control Panel Power Button Button Use these buttons to choose or adjust items in This button is used to turn the monitor ON and the on s creen dis play.
  • Page 6 Universal Serial Bus Making use of USB (Universal Serial Bus)* USB(Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your computer. By using the USB, you will be able to connect your mouse, keyboard, printer, and other peripherals to your monitor instead of having to connect them to your computer.

  • Page 7: Control Locations

    CONT ROL LOCAT IONS V R 801 : High Voltage Adjustment (26kV) V R 901 Adjus tment (190V Line) - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM P250 P201 P402 P401 P801 P902 P901 P702 Socket Signal Cable P302 P301 P303 - 8 -...

  • Page 9: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL & BACK COVER REMOVAL 1) Set the monitor face downward. 2) Carefully remove the Tilt/Swivel by pulling it upward. 3) Pressing the latch (a), Back cover by pushing it upward. (See Figure. 1) 4) Release the latch (c). (See Figure. 2 and Tip Spec.) 5) Slide the Back Cover away from the Front Cabinet of the monitor.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: 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 12 12. High Voltage Output & FBT (Flyback Transformer). 18. Static Convergence Control Circuit. The high voltage output circuit is used for generating This circuit corrects the convergence of the screen by pulse wave to the primary coil of the FBT (Flyback supplying the convergence signal to the 4H (STC) coil Transformer (T701)).

  • Page 13: Adjustment

    ADJUSTMENT GENERAL INFORMATION 3) EEPROM → ALL CLEAR → Y(Yes) command. All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes <Caution> Do not run this procedure unless the several adjustments may be required. EEPROM is changed. All data in EEPROM (mode Adjustment should be following procedure and after data and color data) will be erased.
  • Page 14 11) Display color 15,0 box pattern(70x70mm) at mode 4. 6. Adjustment for Focus. 12) DRIVE ADJ command. 1) Display H character in full screen at Mode 4. 13) Set B-DRIVE to 85 at DRIVE of the alignment 2) Adjust two Focus control on the FBT that focus program.

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) (F901) CHECK TROUBLE IN D901 BRIDGE DIODE BRIDGE DIODE? (D901) CHECK C905(+) VOLTAGE TROUBLE IN 145VDC at 110V input 310VDC at 220V input IC901 CHECK TROUBLE IN...
  • Page 16 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5, 6, 7 ? PC SIGNAL CHECK TROUBLE IN IC302 PIN 19, 20, 21 IC302, P302 PIN 10 (5V) ? CHECK IC303 PIN 1, 3, 5 TROUBLE IN PIN10 (12V), IC303 PIN 6 (80V) ?
  • Page 17 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN-Worldwide / BLUE-Russia or AMBER) CHECK AMBER POWER INDICATOR TROUBLE IN GREEN / BLUE P302 SIGNAL CABLE or AMBER ? GREEN / BLUE CHECK ROTATE SCREEN SCREEN CONTROL CONTROL KNOB TO KNOB OF FBT CLOCKWISE or COUNTER CLOCKWIES CHECK...
  • Page 18 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 3 T901 15V LINE (15V) ? CHECK TROUBLE IN IC601 PIN 7 T701 47V LINE (47V)? CHECK TROUBLE IN IC801 PIN 12 IC801 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT - 18 -...
  • Page 19 5. TROUBLE IN DPM STAND-BY/SUSPEND/ DPMS OFF MODE FAILURE CHECK CHECK PC, IC401 (MICOM) INPUT H/V SYNC SIGNAL (PC IS NOT GOING INTO PIN 40, 41 (H/V INPUT) DPM MODE) SIGNAL? NO H/V SYNC SIGNAL CHECK TROUBLE IN IC401 PIN 9, 8 X401, IC401 WAVEFORM? CHECK...
  • Page 20 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 - 20 -...
  • Page 21 - 21 -...

  • Page 22: Exploded View

    3091TKC 3091TKC114E CABINET ASSEMBLY, F720 BRAND C088 F720PK FLATRON 6318L17020A 6318L17020A CDT(CIRC), M41QEU423X01NDDH LG-PHILIPS 95KHZ 29.1MM FLATRON TCO RTC CDT(CIRC), M41QEU423X01NDDH LG-PHILIPS 95KHZ 29.1MM FLATRON TCO RTC 3809TKC042N BACK COVER ASSEMBLY, F720PK 041NT 3043TKK103H TILT SWIVEL ASSEMBLY, F720 FLATRON 058 060...

  • 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 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON CAPACITOR C602...
  • Page 24 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO C843 0CQ3321N419 3300P 100V J POLY NI TP DIODEs C844 0CBZTTA002A 2000PF D 2.5KV J M/PP NI TP7.5 . C845 181-288B MKT 100V 104JTR PHS26104 D201 0DLTX0039AA TIANXING TL-50194-5W-C-TA(TIN) TP...
  • Page 25 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO 25NA(20V) D914 0DS141489AB 1N4148 TP GRANDE DO-34 500MW 1 D738 0DS141489AB 1N4148 TP GRANDE DO-34 500MW 1 25NA(20V) 25NA(20V) D920 0DRSD00079A D2L20U SHINDENGEN TP DO-204AC 200V D740 0DS141489AB 1N4148 TP GRANDE DO-34 500MW 1...
  • Page 26 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO FB304 6210TCZ001J BAS3550T0(125-022J) BO SUNG IC903 0ISS780500F KA7805 RH3.5*5.0*0.8TMM AXIAL52MM IC905 0ISS781200K KA78R12-STU TO220(4L) BK L/DROP 12V FB305 6210TCE003J BAS2550T BO SUNG 2550MM AXIAL52MM REGULATOR FB306 6210TCE003A...
  • Page 27 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO RESISTORs R434 0RN1002F409 10K 1/6W 1 TA52 R201 0RD1001Q609 1K 1/4W(3 5% TA52 R440 0RD1000Q609 100 1/4W(3 5% TA52 R202 0RD1600Q609 160 1/4W(3 5% TA52 R443 0RD1001Q609 1K 1/4W(3 5% TA52...
  • Page 28 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO R745 0RD0472Q609 47 1/4W(3 5% TA52 R875 0RX0242K607 24 OHM 2 W 5.00% TA62 R746 0RX1503L607 150K OHM 3 W 5% TA62 R876 0RD3002Q509 30000 OHM 1/4 W (3.4) 2% TA52 R747 0RX1503L607...
  • Page 29 MODEL: F720PK DATE:2004.03.01 MODEL: F720PK DATE:2004.03.01 LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON SG303 6918TAT007A KSA-201-MA Y&Y UNICTRON AXIAL TAPING SG304 6918TAT007A KSA-201-MA Y&Y UNICTRON AXIAL TAPING SG305 6918TRT004B SG5-152-CB Y&Y UNICTRON RADIAL TAPING SG701 6918TRT004B SG5-152-CB Y&Y UNICTRON RADIAL TAPING SW201 6600R00001A...

  • Page 30: Pin Configuration

    PIN CONFIGURATION 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 CAGC This pin is used to set oscillating frequency VREF CAGC This pin is used for AGC setting Output terminal of error signal...

  • Page 31: Schematic Diagram

    SCHEMATIC DIAGRAM -32- -31-...

  • Page 32: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 5. USB BOARD (Component Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) 6. USB BOARD (Solder Side) - 33- - 34 -...
  • Page 33 Mar. 2004 P/NO : 3828TSL086N Printed in China...

Table of Contents