LG FLATRON F720BL-AL E Series Service Manual

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Service Guide Specification

Model Description

MODEL

F720BL

SUFFIX

KLEUED

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 :

6. Language :

7. Number of pages :

Special Instructions

Changes

REV.

MM/DD/YY

NO.

BRAND

Product Name

215mm x 280 mm

Saddle stitch

English

% %

CHANGE NO.

FLATRON F720B

CHANGE

9 9 9 9 9 9 9 9

FAN.Y.Y

YEO.H.M

2004.08.07

Part No.

3828TSL105D

CONTENTS

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Summary of Contents for LG FLATRON F720BL-AL E Series

Page 1 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/ • Cover : Snow white paper 100 g/ •...
Page 2 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; 2003. 12 .
Page 3: Table Of Contents
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 ............8 REPLACEMENT PARTS LIST ......37 ADJUSTMENT ............
Page 4: 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 5: Servicing Precautions
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 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 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. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off"...
Page 8: Timing Chart
TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Sync Duration Front Porch Blanking Time Back Porch Resolution Mode Frequency Time (B) Polarity Sort –...
Page 9: Disassembly
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. the figure. 2.
Page 10: Adjustment
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 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, 2.0mm...
Page 12 11-2. Adjustment of White Balance PROCEDURE For trained and experienced service technicians only. After finishing adjustment of cut off (back raster), approve "Color(15.0) Full white pattern". Use the following procedure to correct minor color Adjust BDRV Data = 90, SCON=127. purity problems: Adjust RDRV and GDRV to set chromaticity diagram at : 1.
Page 13 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. 3) Display color 0,0 pattern at Mode 4.
Page 14 - 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 => Need to Port Setup. This program is available to LCD Monitor only.
Page 15 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 # 43 * 01...
Page 16: Wiring Diagram
WIRING DIAGRAM P201 P405 P501 P701 S + S P702 P402 Socket P902 Signal Cable P302 P301 - 15 -...
Page 17: Block Diagram
BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 16 -...
Page 18: Description Of Block Diagra
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 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. The video drive IC(IC302) receives the R,G,B drive and contrast signal from the MICOM video signal from PC.
Page 20: Troubleshooting Guide
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 310VDC at 220V input IC901, Q901 CHECK...
Page 21 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 PIN8 (8V), IC303 PIN 4 (80V) ?
Page 22 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 VOLTAGE AT D961 CATHODE (50V) TROUBLE IN PRIMARY...
Page 23 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)? TROUBLE IN IC601, V-CIRCUIT Waveforms...
Page 24 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 X401, IC401 WAVEFORM? CHECK...
Page 25 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 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. Check and replace T703 Q706 base, collector and Q706.Check DY connector waveforms are right?
Page 27 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 C722, C723, C726, C729 39K ~ 43.9K 44K ~ 48.9K...
Page 28 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. Side Pin or Trap Failure Check if AC Voltage of IC401 Pin 35 Check and replace IC401.
Page 29 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. V Size or Pos. Variation Failure IC401 Pin 33, 34 Check some parts around IC401.
Page 30 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. IC302 Pin22 Check and replace IC302 input exists and varies...
Page 31: Schematic Diagram
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. Waveforms IC401, #24 FBT, #12...
Page 32 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. right? Done.
Page 33 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. signal cable.
Page 34 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 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. Check the CRT Socket.
Page 36: Exploded View
- 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
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 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO CAPACITORS C421 0CK1020K515...
Page 39 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 2000MA 4NSEC 0.025UA C913 0CE476CK638...
Page 40 MODEL :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO 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 MPSA92 KEC TP TO92 -300V -500MA 1000V 1A 30A 75NSEC 10UA Q821...
Page 41 MODEL :F720BL DATE:2004.08.07 MODEL :F720BL DATE:2004.08.07 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO 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 R419 0RN4702F409 47K 1/6W 1% TA52...
Page 42 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” SW201 6600R00001A “JTP1280F6 JEIL 12V DC 1MA VERTICAL,7MM”...
Page 43 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, #35 IC401, #33 IC401, #34 IC401, #18 IC401, #21 Q901, Drain IC901, #6 IC401, #20 Q719, Drain Q705, Drain...
Page 45 Dec. 2003 P/NO : 3828TSL105D Printed in China...

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LG FLATRON F720BL-AL E Series Service Manual

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