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LG Flatron F700P Service Manual
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LG Flatron F700P Service Manual

Color monitor
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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-114 (FB790G-UL)
FACTORY MODEL: FB790G
MODEL:
monitor-man-uk
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
F700P

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Summary of Contents for LG Flatron F700P

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-114 (FB790G-UL) FACTORY MODEL: FB790G MODEL: F700P monitor-man-uk CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • 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..........22 CONTROL LOCATIONS ......... 7 REPLACEMENT PARTS LIST ......24 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 VESA Sync Polarity – Frequency 43.269 53.674 68.677 91.146 µs Total Period 23.112 18.631 14.561 10.971 µs Video Active Time 17.778 14.222 10.836 8.127 µs Blanking Time...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW USB port AC Power Socket See Front Control Panel Power Button D-Sub Signal Connector Front Control Panel 1. Power Button Button Use these buttons to choose or adjust items in This button is used to turn the monitor ON and the on screen display.
  • 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

    CONTROL LOCATIONS VR801 : High Voltage Adjustment (26kV) VR901 : B Adjustment (192V Line) - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM P201 P401 P402 P801 P453 P451 P901 P702 P910 Socket P502 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

    SIGNAL INPUT TRANS (T903)

  • 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 100 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 18, 19, 20, IC302, P302 PIN 6 (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 or AMBER) CHECK AMBER POWER INDICATOR TROUBLE IN GREEN or AMBER ? P302 SIGNAL CABLE GREEN CHECK ROTATE SCREEN SCREEN CONTROL CONTROL KNOB TO KNOB OF FBT CLOCKWISE or COUNTER CLOCKWIES CHECK VOLTAGE AT D924/D926 CATHODE (192V) TROUBLE IN PRIMARY...
  • Page 18 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 2 T901 15V LINE (15V) ? CHECK TROUBLE IN IC601 PIN 4 T901 -12V LINE (-12V)? 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) 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...
  • 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 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 18 TROUBLE IN (V-PULSE COMES IN?) P302 CHECK IC301 PIN 13, 14, 15 TROUBLE IN (IS THERE ANY SIGNAL IC301, IC401...

  • Page 22: Exploded View

    EXPLODED VIEW...

  • Page 23: Exploded View Parts List

    Ref. No. Part No. Description 3091TKC074B CABINET ASSEMBLY, FB790G BRAND 068 2423GC3E41W CDT(CIRC), M41QBF423X 15NPLD LG-PHILIPS Displays 95KHZ 29.1 mm 3809TKC042E BACK COVER ASSEMBLY, FB790G 041 PFC,USB 3809TKC042B BACK COVER ASSEMBLY, FB790G 3808TKC041A 96KHZ (NON PFC) 3043TKK085A TILT SWIVEL ASSEMBLY, 2ND FLATRON 3042TKT060A (17")

  • Page 24: 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. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 25 DATE: 2002. 5. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C708 0CE476CQ618 47U SHL 200V M FL TP5 C858 181-303A 104J 20.5*18.5*10.5*10.0 250V C709 181-477A 102J 19.5*12.0*7.0*7.5 250V J C859...
  • Page 26 DATE: 2002. 5. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D308 0DS124409AA 1SS244 TP ROHM KOREA D773 0DS141489AB 1N4148 TP GRANDE DO-34 500MW 1 D309 0DS124409AA 1SS244 TP ROHM KOREA...
  • Page 27 DR10*10 4.7UH 0.16MM 322.5T Q771 0TR920009AB KSP92 TP SAMSUNG TO92 HIGH VOL L901 6140TBZ032B EE42SI PFC 49MH 0.42MM 230 +/- Q801 0TR558900BA 2SC5589(LG,W/M) BK TOSHIBA TO3 L910 150-985F DR10*10 10UH 0.5MM 14.5T (PFC) Q802 0TR471009AA KSD471AC-Y TP SAMSUNG TO92 NP FB201 125-155J BFS2550A0FG SAMWHA 2.5*5.0MM A...
  • Page 28 DATE: 2002. 5. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q843 0TR114009AB DTC114ES TP ROHM-K SPT NPN R335 0RD1000Q609 100 1/4W(3 5% TA52 Q844 0TR114009AB DTC114ES TP ROHM-K SPT NPN R336...
  • Page 29 DATE: 2002. 5. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R502 0RH1502D622 15K 1/10W 5 D.R/TP R714 0RD1001Q609 1K 1/4W(3 5% TA52 R503 0RH1502D622 15K 1/10W 5 D.R/TP R716 0RD1004Q609...
  • Page 30 DATE: 2002. 5. 14. DATE: 2002. 5. 14. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R837 0RN1202F409 12K 1/6W 1% TA52 R951 0RD1101A609 1.1K OHM 1/2 W (7.0) 5% TA52 R838 0RD0101Q609 1 1/4W(3 5% TA52...

  • Page 31: 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 32: Schematic Diagram

    DDC SCL DDC SDA...
  • Page 33 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side)

This manual is also suitable for:

Flatron f700p fb790g-ulFb790g-ul

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