LG FLATRON T930BUL-KL E Series Service Manual
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LG FLATRON T930BUL-KL E Series Service Manual

LG FLATRON T930BUL-KL E Series Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CA-137
MODEL:
(
) **Same model for Service
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
T930BU
(T930BUL-KL***E*)
*Same looking with new chassis

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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-137 MODEL: T930BU (T930BUL-KL***E*) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *Same looking with new chassis...
  • Page 2 NORMAL SLEEP POWER OFF 56 8 Operating Humidity Less than m(RELIABILITY) Less than3000m(FOS) 7.44 5.67 21.2 43.35 4.82...

  • 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 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 8 DIS A S S E MB LY 1. T IL T /S WIV E L & B A C K C OV E R R E MOV A L 1) S et the monitor face downward. 2) C arefully remove the T ilt/S wivel by pulling it upward. 3) Remove the screw (b), B ack cover by pus hing it upward.
  • Page 9 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 10 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.) 2.5mm, 2.5mm...
  • Page 11 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 to BDRV Data = 92(5C). purity problems: Adjust RDRV and GDRV to set chromaticity diagram at : x: 0.283 0.003...
  • Page 12 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 13 - 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 14 EDID DATA EDIT Item Content Hexadecimal Manufacturer ID 1E 6D Product ID 19126 4A B6 Year 2005 Version Revision EDID Data Edit Using Service software Program 2 Write EDID Data. 1 Read and Modify EDID Data 1) Connector the monitor and adjust device as Figure1 1) Display color 15,0 cross hatch pattern at Mode 4.

  • Page 15: Wiring Diagram

    WIRING DIAGRAM P201 P551 P401 P701 P402 P901 P702 Socket Signal Cable P302 P301 P303 - 15 -...

  • Page 16: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 16 -...

  • Page 17: 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 30kV in an abnormal procedure is as follows: case, the high voltage detector circuit, R818,D721,C739, 1) The AC line voltage is rectified by the bridge diode R416, R417,C409 start operation to shut down high D901.
  • Page 18 15. Video Processor Circuit. 18. Moire Reduction Circuit This circuit reduce interference between the periodical Video processor circuit consists of the video drive display pattern and the CDT's slot (or dot). output block. The video drive IC(IC302) receives the The positions of every other one dot video signal video signal from PC.

  • Page 19: 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 Q905 OK? Q905 CHECK TROUBLE IN D901 BRIDGE DIODE? BRIDGE DIODE (D901) CHECK C905(+) VOLTAGE TROUBLE IN 145VDC at 110V input IC901, Q901 310VDC at 220V input...
  • Page 20 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 5,6,7 Pin PC SIGNAL CHECK TROUBLE IN IC302 1,19, 20, 21,23,24 IC302, P302 PIN 10 (5V) ? CHECK IC303 PIN 1, 3, 5 TROUBLE IN PIN8 (12V), IC303 PIN 4 (80V) ? CHECK TROUBLE IN...
  • Page 21 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or AMBER) CHECK AMBER TROUBLE IN POWER INDICATOR P302 SIGNAL CABLE GREEN or AMBER ? GREEN CHECK ROTATE SCREEN CONTROL SCREEN CONTROL KNOB TO CLOCKWISE KNOB OF FBT or COUNTER CLOCKWIES CHECK VOLTAGE AT D924 CATHODE (80V) TROUBLE IN PRIMARY...

  • Page 22: No Vertical Deflection

    4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 3 (15V) ? T901 15V Line CHECK TROUBLE IN IC601 PIN 7 (40V)? T701 40V line CHECK TROUBLE IN IC601 PIN 1,2 IC401 OR R444,R445 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT Waveforms...
  • Page 23 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 WAVEFORM? CHECK...
  • Page 24 6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 4 (5V)? IC401 (MICOM) CHECK TROUBLE IN Q953 COLLECTOR D952 VOLTAGE (0.5V)? CHECK TROUBLE IN P902? P902 TROUBLE IN CHECK RL901 RL901? TROUBLE IN TH901, DEGAUSSING COIL - 24 -...
  • Page 25 7. H_Deflection Failure IC401 Pin 18 Replace IC401 waveform is right? 1. check 15V LINE Q720 Collector waveform 2. Replace Q720 is right? Q719 drain Replace Q719 waveform is right? Q705 drain Check and Replace Q705 waveforms are right? Check and replace Q706, R730 Q706 base, collector R734 and D709.Check DY waveforms are right?
  • Page 26 9. S Correction Failure Check S1 ~ S4 signal. Refer to the S-corrction table page? S1~S4 signals are right at Check and replace IC401. each frequency block? Check and replace C723, C726,C729,C737 Q721 Q711 ~ Q713, Q714~Q717 10. H_Lin. Failure IC401 PIN6 Volt Check Replace IC401.
  • Page 27 11. Side Pin or Trap Para.Pin Banlance Failure Check EW waveform(IC401 pin35) Replace IC401. Variable Check Q703 and 12V line. Check Q703 Collection waveform variable Replace R727 or C719 Waveforms Q703, Drain - 27 -...
  • Page 28 12. Tilt Failure Check tilt connector connection IC401 Pin 31 output duty varies with Check and replace IC401. different DAC values? Q551 Check and replace Q551 collect values? Q552,Q553 Check and replace Q552,Q553 emit values? Check and replace CRT. 13. V Size or Pos. Variation Failure IC401 Pin 33,34 Check some parts around IC401.
  • Page 29 14. ABL Failure Input full white pattern to monitor. IC401 Pin5 Check and replace IC401 input exists and varies When adjust ABL? Q787 C Voltage, Check Q787 and around varies. IC302 22 Pin Voltage varies? Check 15V Line Check D801 R803 Check IC302 15.
  • Page 30 16. Micom Failure IC401 Pin 16 input is over Check IC903. 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 18. 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. 19. Missing Color Proper Video levels are Check signal generator and on P301 Pin 1, 3 and 5. signal cable.
  • Page 32 20. 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 P302 Assy, Is V_FLB and DC_bias on G1 Pin at CRT socket? Done.
  • Page 33 22. 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. Refer to 15 Dynamic Dynamic focus circuit is Focus Failure. right? Replace the CRT and verify focus. 23.
  • Page 34 - 34 -...

  • Page 35: Exploded View Parts List

    CABINET ASSEMBLY, T930BUL BRAND C105 TCO03 SILVER VERSION 3091TKC140A 3091TKC140B CABINET ASSEMBLY, T930BUL BRAND C105 TCO03 SILVER VERSION 6318L19014C CDT(CIRC) M46QEF903X28(T)SDDP LG-PHILIPS DISPLAYS 85KHZ 29.1MM FCDT(S) 6318L19014A CDT(CIRC) M46QEF903X25(T)NNTP LG-PHILIPS DISPLAYS 85KHZ 29.1MM FCDT 6318L19014B CDT(CIRC) M46QEF903X27(T)QDDP LG-PHILIPS DISPLAYS 85KHZ 29.1MM FCDT(EQ)

  • Page 36: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE : S SAFETY Mark AL ALTERNATIVE PARTS MODEL :T930BUL DATE:2005.02.21 MODEL :T930BUL DATE:2005.02.21 PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO PART NO.
  • Page 37 MODEL :T930BUL DATE:2005.02.21 MODEL :T930BUL DATE:2005.02.21 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO C 7 4 9 0 C E 1 0 6 C Q 6 1 8 10UF SHL 200V M FL TP5 D 4 0 3 0 D S 1 4 1 4 8 9 A B 1N4148 TP GRANDE DO-34 500MW 1 C 7 5 0...
  • Page 38 150A 50NSSEC 10.0UA I C 3 0 1 0 I C T M L G 0 1 5 A "LGDP4301 LG IC 24P,PDIP ST BRIGHT D 9 2 3 0 D R V H 0 0 0 9 1 A GURF5H60 VISHAY ST ITO220 600V 5A W I N D O W "...
  • Page 39 MODEL :T930BUL DATE:2005.02.21 MODEL :T930BUL DATE:2005.02.21 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO Q 7 1 8 0 T R 3 2 0 5 0 9 A B KTC3205-Y(KTC2236A) TP KEC TO92L R 3 5 2 0 R D 1 0 0 0 Q 6 0 9 100 1/4W(3 5% TA52 N P N R 3 5 3...
  • Page 40 MODEL :T930BUL DATE:2005.02.21 MODEL :T930BUL DATE:2005.02.21 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO R 5 5 4 0 R D 1 2 0 2 Q 6 0 9 12K 1/4W(3 5% TA52 R 7 9 9 0 R D 1 5 0 2 Q 6 0 9 15K 1/4W(3 5% TA52 R 5 5 6 0 R D 0 1 0 2 A 6 0 9...
  • Page 41 MODEL :T930BUL DATE:2005.02.21 MODEL :T930BUL DATE:2005.02.21 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO T A P I N G S G 3 0 3 6 9 1 8 T A T 0 0 7 A KSA-201-MA Y&Y UNICTRON AXIAL T A P I N G S G 3 0 5 6 9 1 8 T R T 0 0 4 B...
  • Page 42 SCHEMATIC DIAGRAM IC401, #45,46 IC302, #19, 20, 21 IC401, #18 Q720 Collector IC601, #1 IC601, #2 Q901, Drain IC901, #6 IC302,#5,6,7 IC302, #1 IC302, #23 FBT, FOCUS Q706, Base Q706, Collector Q705, Drain CDT, RK, GK, BK IC302, #24 Q703, Drain Q719, Drain - 43 - - 42 -...
  • Page 43 PRINTED CIRCUIT BOARD 5.VIDEO BOARD(component side) 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 6.VIDEO BOARD(solder side) Side) - 44 - - 45 -...
  • Page 44 Dec. 2004 P/NO : 3828TSL109H Printed in China...

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