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LG Flatron T710BH Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CA-136
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MENU
SELECT
Brightview
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
T710BH
(T710BHL-AL**E)
T710SH
(T710BHL-AL**M)
T710B
(T710BL-AL**E)
T710S
(T710BL-AL**M)
Issue Date; 2004. 7.

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  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-136 MODEL: T710BH (T710BHL-AL**E) T710SH (T710BHL-AL**M) T710B (T710BL-AL**E) T710S (T710BL-AL**M) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MENU SELECT Brightview Issue Date; 2004. 7.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....11 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............12 TROUBLESHOOTING GUIDE ......13 SERVICE PRECAUTION.......... 4 EXPLODED VIEW........... 34 TIMING CHART ............7 WIRING DIAGRAM ..........8 REPLACEMENT PARTS LIST ....... 36 DISASSEMBLY ............9 SCHEMATIC 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: 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 5 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 6 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 7: 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 Mode Resolution Frequency Time (B) Sort Polarity –...
  • Page 8 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 (b), Back cover by pushing it upward. 4) Release the latch (c). (See Tip Spec.) 5) Slide the Back Cover away from the Front Cabinet of the monitor.

  • Page 9: Wiring Diagram

    WIRING DIAGRAM P201 P405 P501 P701 P702 S + S P402 Socket P902 Signal Cable P302 P301 - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. SMPS(Switching Mode Power Supply) 6. X-RAY Protection Circuit When you turn on the power switch, the operating When the high Voltage reaches to 29kV in an abnormal case, fprocedure is as follows: the high voltage detector circuit, R818,D721,C739-1 R416, C409 start operation to shut down high voltage circuit.
  • Page 12 15. Video Pre-Amp Circuit. 16. Video Output Amp Circuit. This circuit amplifies the analog video signal from 0~0.7 V This circuit amplifies the video signal which comes from the to 0~4 V. It is operated by taking the clamp, R,G,B drive video pre-amp circuit and amplified it to applied the CDT and contrast signal from the MICOM (IC401) cathode...

  • Page 13: 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 14 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 15 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. purity problems: Adjust RDRV and GDRV to set chromaticity diagram at : x: 0.283 0.005...
  • Page 16 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 17 4. EDID Data Edit Using Service software Program 4.1 Read and Modify EDID Data 1) Connector the monitor and adjust device as Figure1 2) Display color 15,0 cross hatch pattern at Mode 4. 3) Use EDIT – MODEL SEL. command to select the right model info file. 4) Use EDIT –...

  • Page 18: 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 19 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 20 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 21: No Vertical Deflection

    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 22 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 23: No Degaussing

    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 - 23 -...
  • Page 24 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 25: Trouble In H-Linearity

    9. 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 26 10. 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. 11. Side Pin or Trap Failure Check if AC Voltage of IC401 Pin 35 Check and replace IC401.
  • Page 27 13. 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. 14. V Size or Pos. Variation Failure IC401 Pin 33, 34 Check some parts around IC401.

  • Page 28: High Voltage Failure

    15. 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 16. ABL Failure Input full white pattern to monitor. IC302 Pin22 Check and replace IC302 input exists and varies...
  • Page 29 17. 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 30: Micom Failure

    18. 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 31: Missing Color

    20. 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. 21. Missing Color Proper Video levels are Check signal generator and on P301 Pin 1, 3 and 5. signal cable.

  • Page 32: Purity Failure

    22. 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 33: Poor Focus

    24. Misconvergence Degauss the CDT Adjust Pole4,Pole6 Done to improve the misconvergence Change CRT and readjust convergence. Done. 25. 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 34 - 34 -...

  • Page 35: Exploded View

    C AB LE ,D-S UB , UL20276-9C (5.8MM) AT 1560MM G R AY (85964) T 710B J DM 6850T A9012A P WB (P C B ) AS S E MB LY ,S UB , T 710B K C ONT R OL T OT AL B R AND LG E NT 6871T S T 463B...

  • Page 36: 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:2004.08.08 DATE:2004.08.08 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO CAPACITORs C422 0CK2220K515 2200P 50V K B C423 0CK2220K515...
  • Page 37 DATE:2004.08.08 DATE:2004.08.08 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO C912 0CK3310K515 330P 50V K B TS 1500V 4A 40A 150NSSEC 7UA C913 0CE476CK638 Ò47UF SHL,SD 50V M FM5 TP 5Ó D705 0DRTW00089A SRT14(1021) TIWAN SEMI TP NON 40V 1A C914 0CZZTFT001P ECQB1H153JM3 153J 50V TP5.0...
  • Page 38 DATE:2004.08.08 DATE:2004.08.08 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO 5.6BV 5MA PF Q719 0TFFC10012A FQPF10N20C FAIRCHILD ST TO220F ZD405 0DZPT56009A UZ-5.6BSB PCTRONIX TP52 DO34 500MW 200V 9.5A 5.6BV 5MA PF Q720 0TR390409CA FAIRCHILD 2N3904(TA) TP TO-92 ZD406 0DZPT56009A UZ-5.6BSB PCTRONIX TP52 DO34 500MW 60V 0.2A...
  • Page 39 DATE:2004.08.08 DATE:2004.08.08 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO R414 0RD1602Q609 16K 1/4W(3 5% TA52 R739 0RD2701Q609 2.70K 1/4W(3 5% TA52 R415 0RD1000Q609 100 1/4W(3 5% TA52 R740 0RD0271A609 2.7 OHM 1/2 W (7.0) 5% TA52 R416 0RN1501F409 1.5K 1/6W 1 TA52 R744...
  • Page 40 DATE:2004.08.08 DATE:2004.08.08 LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON SG305 6918TRT005A ÒSSG-102-A0,1KV SMART RADIAL TAPINGÓ SG701 6918TRT005A ÒSSG-102-A0,1KV SMART RADIAL TAPINGÓ SW201 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL,7MMÓ SW202 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL,7MMÓ SW203 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA...

  • Page 42: Printed Circuit Board

    PRINTED CIRCUIT BOARD 2. CONTROL BOARD (Solder Side) 1. CONTROL BOARD (Component Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) - 44 - - 45 -...
  • Page 43 Jul. 2004 P/NO : 3828TSL105C Printed in China...

This manual is also suitable for:

T710shT710bhl-al**mT710bhl-al**eT710bl-al**eFlatron t710sT710b ... Show all

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