1. Manuals
  2. Brands
  3. LG Manuals
  4. Monitor
  5. T910B
  6. Service manual

LG T910B Service Manual

Hide thumbs Also See for T910B:
Table of Contents

Advertisement

Quick Links

See also: User Manual

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.
MENU
SELECT
Brightview
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
T910B
(T910BM-KL***E*)
*Same looking with new chassis

Advertisement

Table of Contents
loading

Related Manuals for LG T910B

Summary of Contents for LG T910B

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-137 MODEL: T910B (T910BM-KL***E*) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MENU SELECT Brightview *Same looking with new chassis...
  • Page 2 MODE VIDEO POWER CONSUMPTION LED COLOR NORMAL less than 103W GREEN less than 4W AMBER less than 2W Less than domestic Less than3000m(china) 448.0 7.64 58.0 398.0 15.67 21.2...

  • 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 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 9 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 10 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 11 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 12 - 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 13 EDID DATA EDIT Item Content Hexadecimal Manufacturer ID 1E6D Product ID 19053 4A6D Year 2005 Version Revision EDID Data Edit Using Service software Program 1 Read and Modify EDID Data 2 Write EDID Data. 1) Connector the monitor and adjust device as Figure1 1) Display color 15,0 cross hatch pattern at Mode 4.

  • Page 14: Wiring Diagram

    WIRING DIAGRAM P201 P551 P401 P701 P402 P901 P702 Socket Signal Cable P302 P301 P303 - 14 -...

  • Page 15: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen - 15 -...

  • Page 16: 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 17 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 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 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 19 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 20 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 21: 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 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 WAVEFORM? CHECK...
  • Page 23 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 - 23 -...
  • Page 24 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 25 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 26 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 - 26 -...
  • Page 27 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 28 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 29 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 30 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 31 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 32: Poor Focus

    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 33 - 33 -...

  • Page 34: Exploded View Parts List

    3091TKC112M CABINET ASSEMBLY, T910BK BRAND TKC080 DOW TCO 3091TKC112B CABINET ASSEMBLY, T910BK BRAND TKC080 DOW TCO CDT(CIRC) M46QEF903X25(T)NNTP LG-PHILIPS DISPLAYS 85KHZ 29.1MM TINT FCDT 6318L19014A 6318L19014B CDT(CIRC) M46QEF903X27(T)QDDP LG-PHILIPS DISPLAYS 85KHZ 29.1MM TINT FCDT(EQ) CDT(CIRC) M46QEF903X28(T)SDDP LG-PHILIPS DISPLAYS 85KHZ 29.1MM TINT FCDT(S)

  • Page 35: 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: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO CAPACITORs...
  • Page 36 MODEL: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO C790 0CN1040K949 "0.1UF D 50V 80%,-20% F(Y5V) TA52" D316 0DR140059DA "1N4005TB52 TP LITEON DO41 600V 1A C803 181-288B MKT 100V 104JTR PHS26104 40A ,SEC 5UA" C807 181-288B MKT 100V 104JTR PHS26104...
  • Page 37 MODEL: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO D903 0DR100009CA RGP10G TP GULF SEMICONDUCTOR LTD. FB505 6210TCE003A BRD3510B BO SUNG 3510MM RADIAL DO41 400V 1A 30A - 100UA FB507 6210TCE003B BRS3580B BO SUNG 3580MM RADIAL D904 0DR100009DA RGP10J TP GULF SEMICONDUCTOR LTD.
  • Page 38 MODEL: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON Q721 0TFAU10002A STK630F AUK KOREA ST TO220F 200V 9A R406 0RD2201Q609 2.20K 1/4W(3 5% TA52 Q731 0TR534309AA 2SC5343Y TP AUK - - R407 0RD4701Q609 4.70K 1/4W(3 5% TA52 Q787 0TRAU80033A...
  • Page 39 MODEL: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 PART NO. DESCRIPTION/SPECIFICATON PART NO. DESCRIPTION/SPECIFICATON LOC NO LOC NO R702 0RD6800Q609 680 1/4W(3 5% TA52 R903 0RD0512Q609 51 1/4W(3 5% TA52 R703 0RD1002A609 10K OHM 1/2 W(7.0) 5.00% TA52 R905 0RX7502K607 75K OHM 2 W 5.00% TA62 R704 0RD1002Q609 10K OHM 1/4 W(3.4) 5.00% TA52...
  • Page 40 MODEL: T910BM DATE:2005.09.06 MODEL: T910BM DATE:2005.09.06 LOC NO PART NO. DESCRIPTION/SPECIFICATON LOC NO PART NO. DESCRIPTION/SPECIFICATON SW204 140-058D SKHV10911A LGEC NON 12 20 HORIZENTAL 160 SW205 140-058D SKHV10911A LGEC NON 12 20 HORIZENTAL 160 SW206 140-058D SKHV10911A LGEC NON 12 20 HORIZENTAL 160 SW250 6600M000051...
  • Page 41 WF11 WF13 WF12 WF10 WF14 WF16 WF15 WF18 WF19 IC401, #45,46 IC401, #18 IC302, #19, 20, 21 Q720 Collector IC601, #1 IC601, #2 Q901, Drain IC901, #6 IC302,#5,6,7 IC302, #1 IC302, #23 CDT, RK, GK, BK IC302, #24 FBT, FO Q706, Base Q706, Collector Q705, Drain...
  • Page 42 PRINTED CIRCUIT BOARD 5.VIDEO BOARD(component side) 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 6.VIDEO BOARD(solder side) Side) - 43 - - 4 4 -...
  • Page 43 Sep. 2005 P/NO : 38289S0019B Printed in China...

Table of Contents