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LG FLATRON F720B Service Manual
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LG FLATRON F720B Service Manual

LG FLATRON F720B Service Manual

Color monitor
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Service Guide Specification
Service Guide Specification
1.
Model Description
MODEL
F720BL
SUFFIX
KLEUED
2.
Printing Specification
1. Trim Size (Format) :
2. Printing Colors
• Cover :
LG COLOR
• Inside :
Black
3. Stock (Paper)
Snow white paper 150 g/   
• Cover :
Snow white paper 100 g/   
• Inside :
4. Printing Method :
5. Bindery :
Saddle stitch
6. Language :
7. Number of pages :
3.
Special Instructions
4.
Changes
8
7
6
5
4
3
2
1
REV.
% %
% %
% %
% %
MM/DD/YY
NO.
All manuals and user guides at all-guides.com
BRAND
Product Name
215mm x 280 mm
English
45
CHANGE NO.
LG
FLATRON F720B
CHANGE
9 9 9 9 9 9 9 9
FAN.Y.Y
YEO.H.M
2004.08.07
2004.08.07
Part No.
3828TSL105D
CONTENTS

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  • Page 1 2004.08.07 2004.08.07 MODEL F720BL BRAND Part No. 3828TSL105D SUFFIX KLEUED Product Name FLATRON F720B Printing Specification 1. Trim Size (Format) : 215mm x 280 mm 2. Printing Colors • Cover : LG COLOR • Inside : Black 3. Stock (Paper) Snow white paper 150 g/    •...
  • Page 2 All manuals and user guides at all-guides.com Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-136 MODEL: F720B (F720BL-AL**E) ) **Same model for SVC CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *Same looking with new chassis. Issue Date;...

  • Page 3: Table Of Contents

    All manuals and user guides at all-guides.com CONTENTS SPECIFICATIONS ........... 2 BLOCK DIAGRAM ..........16 SAFETY PRECAUTIONS ........3 DESCRIPTION OF BLOCK DIAGRA ....17 SERVICING PRECAUTIONS ........4 TROUBLESHOOTING GUIDE ......19 TIMING CHART ............7 EXPLODED VIEW..........35 DISASSEMBLY ............

  • Page 4: Safety Precautions

    All manuals and user guides at all-guides.com 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 5: Servicing Precautions

    All manuals and user guides at all-guides.com SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in service manual and its supplements and addenda, read this service manual. and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication.
  • Page 6 All manuals and user guides at all-guides.com General Soldering Guidelines Replacement 1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad and solder it.
  • Page 7 All manuals and user guides at all-guides.com Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins.

  • Page 8: Timing Chart

    All manuals and user guides at all-guides.com TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Blanking Time Sync Duration Front Porch Back Porch Resolution Mode Frequency...

  • Page 9: Disassembly

    All manuals and user guides at all-guides.com DISASSEMBLY 1. Carefully place the monitor on a soft cushion 4. Separate the back cover from the latch at the and stand it upright with the cabinet facing bottom of the cabinet using the jig as shown in downward.

  • Page 10: Adjustment

    All manuals and user guides at all-guides.com ADJUSTMENT 1. Preparation for Service Adjustment 2. Adjustment by Service Hot key How to enter SVC HOT KEY GENERAL INFORMATION 1. Press Menu and OSD window will appear. 2. While OSD window is displayed, is seen on the All adjustment are thoroughly checked and corrected left bottom of OSD window.
  • Page 11 All manuals and user guides at all-guides.com 4. Distortion 10. Parallelogram Scanning frequency : All Mode (Mode 1~4) Display image : Crosshatch pattern Horizontal : 10 Row Vertical : 8 Row 11. Adjustment of white balance (Adjustment of chromaticity diagram) *(Adjustment of white balance must be made after entering Hot Key Mode and DEGAUSS.) 2.0mm,...
  • Page 12 All manuals and user guides at all-guides.com 11-2. Adjustment of White Balance PROCEDURE After finishing adjustment of cut off (back raster), For trained and experienced service technicians only. approve "Color(15.0) Full white pattern". Use the following procedure to correct minor color Adjust BDRV Data = 90, SCON=127.
  • Page 13 All manuals and user guides at all-guides.com 3. Adjustment Using Service software Program 2. Adjustment for White Balance and Luminance. (Adjustment Program) 1) Set the White Balance Meter. 2) Press the DEGAUSSING on the OSD menu for 1. Adjustment for Factory Mode (Preset Mode). demagnetization of the CDT.
  • Page 14 All manuals and user guides at all-guides.com - Adjustment and EDID Data Down in GCSC Windows EDID V1.0 User Manual 2. EDID Read & Write 1) Run WinEDID.exe Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup Windows 2000, XP =>...
  • Page 15 All manuals and user guides at all-guides.com EDID DATA EDIT Item Hexadecimal Content Manufacturer ID 1E6D Product ID 177 20 4344 Year 2004 Version Revision Model name F720B 4637303042 Special 0x00 0x01 0x02 0x0 3 0x04 0x05 0x06 0x07 0x0 8 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 6D # 44 0x01...

  • Page 16: Wiring Diagram

    All manuals and user guides at all-guides.com WIRING DIAGRAM P201 P405 P501 P701 S + S P702 P402 Socket P902 Signal Cable P302 P301 - 15 -...

  • Page 17: Block Diagram

    All manuals and user guides at all-guides.com BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 16 -...

  • Page 18: Description Of Block Diagra

    All manuals and user guides at all-guides.com DESCRIPTION OF BLOCK DIAGRAM 1. SMPS(Switching Mode Power Supply) 5. D/D Converter Circuit. When you turn on the power switch, the operating To obtain constant high voltage, this circuit supplies procedure is as follows: controlled DC voltage for FBT and horizontal deflection 1) The AC line voltage is rectified by the bridge diode circuit according to the horizontal sync frequency.
  • Page 19 All manuals and user guides at all-guides.com 15. Video Pre -Amp Circuit. 14. Video Processor Circuit. This circuit amplifies the analog video signal from Video processor circuit consists of the video drive 0~0.7 V to 0~4 V. It is operated by taking the clamp, output block.

  • Page 20: Troubleshooting Guide

    All manuals and user guides at all-guides.com TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) TROUBLE CHECK IN FUSE (F901) FUSE OK?(F901) SMPS Switch (ON, OFF) CHECK TROUBLE IN D900 BRIDGE DIODE? BRIDGE DIODE (D900) CHECK C908(+) VOLTAGE TROUBLE IN 145VDC at 110V input IC901, Q901...
  • Page 21 All manuals and user guides at all-guides.com 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5,6,7 PC SIGNAL CHECK TROUBLE IN IC302 PIN 1, 24, 23, 19, 20, 21 IC302, P301 PIN 18 (5V) ? CHECK IC303 PIN 1, 2, 3 TROUBLE IN...
  • Page 22 All manuals and user guides at all-guides.com 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or FLASH) CHECK FLASH TROUBLE IN POWER INDICATOR P302 SIGNAL CABLE GREEN or FLASH ? GREEN CHECK ROTATE SCREEN CONTROL SCREEN CONTROL KNOB TO CLOCKWISE KNOB OF FBT or COUNTER CLOCKWIES CHECK...
  • Page 23 All manuals and user guides at all-guides.com 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 3 (13V) ? T901 13V Line CHECK TROUBLE IN IC601 PIN 7 (45V)? T701 40V line CHECK TROUBLE IN IC401 PIN 33, 34 IC401 (SAWTOOTH WAVE)?
  • Page 24 All manuals and user guides at all-guides.com 5. TROUBLE IN DPM Stand-by/SUSPEND/ DPMS OFF MODE FAILURE CHECK CHECK PC, INPUT H/V SYNC SIGNAL IC401 (MICOM) (PC IS NOT GOING INTO DPM PIN 52, 53 (H/V INPUT) MODE) SIGNAL? NO H/V SYNC SIGNAL CHECK TROUBLE IN IC401 PIN 45, 46...
  • Page 25 All manuals and user guides at all-guides.com 6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 4 (5V)? IC401 (MICOM) CHECK TROUBLE IN Q953 COLLECTOR D953 VOLTAGE (0.5V)? CHECK TROUBLE IN P902? P902 TROUBLE IN CHECK RL901 RL901? TROUBLE IN TH901, DEGAUSSING COIL - 24 -...
  • Page 26 All manuals and user guides at all-guides.com 7. H_Deflection Failure 1. Check IC401 Pins 39,40,41 IC401 Pin 18 waveform is right? 2. Replace IC401. Q719 drain Check Q720,50V LINE waveform is right? D710 Q705 drain Check Q704 waveform is right? Check 13V line.
  • Page 27 All manuals and user guides at all-guides.com 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 11,12,13 ? CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) 30K ~ 33.9K TROUBLE IN 34K ~ 38.9K...
  • Page 28 All manuals and user guides at all-guides.com 11. Abnormal H_Size The Voltage Repeat the troubleshooting waveform Q706 Collector Guide of H_deflection failure. is right? T701 pin 2 voltage Check D/D converter circuit is change with H frequency? Check IC401 B+ control circuit. 12.
  • Page 29 All manuals and user guides at all-guides.com 14. Tilt Failure Check tilt connector connection IC401 Pin 26 output duty varies with Check and replace IC401. different DAC values? Q501 Emitter output varies Check Q503,Q501,Q502. with different DAC values? Check and replace CRT. 15.
  • Page 30 All manuals and user guides at all-guides.com 16. High Voltage Failure Q719 drain Check Q719,Q720 waveform is right? Check 50V line Repeat the troubleshooting Q706 collecter waveform Guide of H_deflection failure. is right? Replace T701 Waveforms Q719, Drain Q706,Collector 17. ABL Failure Input full white pattern to monitor.

  • Page 31: Schematic Diagram

    All manuals and user guides at all-guides.com 18. Focus Failure IC401 Pin 24 Check and replace IC401. output are right? Q710 and parts around Replace failed part. are right? Some parts around T701 Replace failed part. are right? Check the connection between FBT Pin 12, CRT Socket PCB.
  • Page 32 All manuals and user guides at all-guides.com 19. Micom Failure IC401 Pin 16 input is over Check Q903,D908,ZD902 4.2V? IC401 Pin 45 and 46 Check X401 inputs are right? Check and replace IC401 Pin 23 input is R451,C408 High Active? All in/output values are Replace IC401.
  • Page 33 All manuals and user guides at all-guides.com 21. User Control Failure Check connector Ass’y. IC401 Pins 27 and 28 Check and replace function key. inputs are right at each function? Check and replace IC401. Done. 22. Missing Color Proper Video levels are Check signal generator and on P301 Pin 1, 3 and 5.
  • Page 34 All manuals and user guides at all-guides.com 23. Visible Retrace Check white balance adjustment. G2 voltage is right? Check G2 control volume and FBT. Blank pedestal is on Check IC302 Pin 19, 20 and 21 of IC302 and related components. Check Q799 Is V_FLB and DC_bias on and related components.
  • Page 35 All manuals and user guides at all-guides.com 25. Misconvergence Degauss the CDT Adjust Pole4,Pole6 Done to improve the misconvergence Change CRT and readjust convergence. Done. 26. Poor Focus Adjust focus VR. Aging monitor and Improved focus? check for focus change. Check focus leads from FBT to CRT Socket.

  • Page 36: Exploded View

    All manuals and user guides at all-guides.com - 35 -...
  • Page 37 (For USA & Russia )CABINET ASSEMBLY, F720 BRAND 088 NT FLATRON (For China & TCO03 )CABINET ASSEMBLY,F720BK BRAND C088 PC+ABS KUMI F720B+TCO99+080 3091TKC114F 6318L17021A CDT(CIRC), M41QEU423X51NDDH LG-PHILIPS DISPLAYS 70KHZ 29.1MM FLATRON TCO RTC 3809TKC042P BACK COVER ASSEMBLY, F720BK 041 NT 3043TKK103H For USA &...

  • Page 38: Replacement Parts List

    All manuals and user guides at all-guides.com 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 :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 LOC NO PART NO.
  • Page 39 All manuals and user guides at all-guides.com MODEL :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO C911 0CE475CK638 “4.7UF SHL,SD 50V M FM5 TP 5” D501 0DSPT00029A 1N4148M PCTRONIX TP DO34 100V 75VA C912 0CK3310K515 330P 50V K B TS...
  • Page 40 All manuals and user guides at all-guides.com MODEL :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO BK NON 600V 3A 60A 30NSEC 20UA Q720 0TR390409CA FAIRCHILD 2N3904(TA) TP TO-92 60V 0.2A D971 0DD400709CC UF4007-1021 TIWAN SEMI TP DO204AL Q799 0TRKE90019A...
  • Page 41 All manuals and user guides at all-guides.com MODEL :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO R416 0RN1501F409 1.5K 1/6W 1 TA52 R745 0RD4702Q609 47K 1/4W(3 5% TA52 R417 0RD1000Q609 100 1/4W(3 5% TA52 R746 0RD2201Q609 2.20K 1/4W(3 5% TA52...
  • Page 42 All manuals and user guides at all-guides.com MODEL :F720BL DATE:2004.08.07 MODEL :F7 DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO STRAIGHT SC901 6620TKB002B SA-4S HUA JIE AC UNIVERSAL 3PIN BLACK SG305 6918TRT005A “SSG-102-A0,1KV SMART RADIAL TAPING” SG701 6918TRT005A “SSG-102-A0,1KV SMART RADIAL TAPING”...
  • Page 43 All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM WF29 WF31 WF28 WF27 WF30 WF26 WF15 WF16 WF11 WF17 WF10 WF18 WF23 WF21 WF 7 WF14 WF20 WF22 WF19 C401, #45 IC401, #46 IC401, #18 IC401, #35 IC401, #33 IC401, #34 Q901, Drain IC901, #6 IC401, #21...
  • Page 44 All manuals and user guides at all-guides.com...
  • Page 45 All manuals and user guides at all-guides.com Dec. 2003 P/NO : 3828TSL105D Printed in China...

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