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Kortek KT-2914F Service Manual

Kortek color crt monitor service manual
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COLOR CRT MONITOR
DOC. NO
KT-XX14X-SM
DATE
2004 .02. 02
REV. NO
0
REV. DATE
-
SERVICE
MANUAL
KT-2914F / KT-2914DF
KT-2114F / KT-2114DF
KORTEK CORPORATION

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Summary of Contents for Kortek KT-2914F

  • Page 1: Service Manual

    COLOR CRT MONITOR DOC. NO KT-XX14X-SM DATE 2004 .02. 02 REV. NO REV. DATE SERVICE MANUAL KT-2914F / KT-2914DF KT-2114F / KT-2114DF KORTEK CORPORATION...

  • Page 2: Table Of Contents

    CONTENTS 1. PRECAUTIONS -------------------------------------------------- 3 2. PRODUCT SPECIFICATION -------------------------------- 6 3. OPERATING INSTRUCTION -------------------------------- 9 4. ADJUSTMENTS ------------------------------------------------ 11 5. TROUBLE SHOOTING GUIDE ---------------------------- 19 6. PART LIST ------------------------------------------------------- 29 7. BLOCK DIAGRAM -------------------------------------------- 34 8. CONNECTING DIAGRAM ----------------------------------- 35 9.

  • Page 3: Precautions

    1.Precautions 1-1. Safety precautions Warnings : Service should not be attempted by anyone unfamiliar with the necessary on this Monitor. The followings are the necessary precautions to be observed before servicing. 1) For continued safety, do not attempt to modify the circuit board. 2) Disconnect the AC power before servicing.
  • Page 4 1-1-2. Fire and Shock Hazard Before returning the monitor to the user,perform the following safety checks: 1) Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor.

  • Page 5: Servicing Precautions

    1-1-3. Product safety notices: Some electrical and mechanical parts have special safety related characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher volt- age,wattage,etc. Parts that have special safety characteristics are identified by ¡â...

  • Page 6: Product Specification

    2. Product Specifications 2-1 SPECIFICATION KT-2914F KT-2914DF KT-2114DF KT-2114F Tube 29"No rmal flat 29"Dyna flat 21"Dyna flat 21"No rmal flat Tube Size(Diagonal) 730 mm(2 9") 730 mm(2 9") 550 mm(2 1") 550 mm(2 1") Viewabl e S ize (Dia gonal ) 605 mm(2 7")
  • Page 7 2-2 D-SUB SIGNAL CABLE SPECIFICATION * VGA/SVGA SIGNAL CABLE PIN CONNECTION (15 PIN D-SUB MINIATURE SIGNAL CONNECTOR WITH CABLE ; PCB CKT NO.: CN404 ) CONNECTION REMARK D-SUB 15PIN IBM PC WIRE COLOR 6P CONN 6P CONN RED COAX-IN 6P CONN-6 GREEN GREEN COAX-IN 6P CONN-5...

  • Page 8: Vertical

    2-3 TIMING CHART HORIZONTAL VERTICAL VIDEO SYNC A : LINE TIME TOTAL B :HORIZONTAL SYNC WIDTH C : BACK PORCH D : ACTIVE TIME E : FRONT PORCH O : FRAME TIME TOTAL P : VERTICAL SYNC WIDTH Q : BACK PORCH R : ACTIVE TIME S : FRONT PORCH SVGA...

  • Page 9: Operating Instruction

    3. Operating Instruction 3-1 SET ASS'Y 3.2 MAIN PCB ASS'Y...
  • Page 10 3-3. Function of Control DOWN MENU (SELECT) EXIT (DEGAUSSING) Control Function The light of power LED changes according to each state. ¡Ý on mode : Green LED. (Power Indicator) ¡Ý power saving mode : green LED blinking. When you press this button, the MENU appears.The MENU will disappear in 10 seconds if you don't operate any button.

  • Page 11: Adjustments

    4.Adjustments 4-1. Adjustment Control 4-1-1. Before making Adjustments 1) Orientation When servicing, always face the monitor to east. 2) Warm-up time The monitor must be on for 30 minutes before starting alignment. Warm-up time is especially critical in color temperature and white balance adjustments.
  • Page 12 4-2. Display Control Adjustment Click on the "MENU" button (OSD MENU). This menu is user's OSD manual.(user's manual) ¢Å BRIGHTNESS 31.4KHz 60Hz 1) Click on the "MENU" button. 2) Click on the "UP"or "DOWN" and move any function control. 3) Press the "MENU(SELECT)" button. 4) "UP"...
  • Page 13 b) Vertical size adjustment adjustment : use to "V-SIZE", 400¡¾3mm c) Horizontal position adjustment adjustment : use to "H-POS" d) Vertical position adjustment 4-2-2 Trapezoid adjustment frequency : all mode signal pattern : cross hatch £üA-B£ü< 2.5mm 4-2-3 Pin balance adjustment frequency : all mode signal pattern : cross hatch £üD1£ü,£üD2£ü¡Â1mm...
  • Page 14 4-2-5 Side pin-cushion adjustment frequency : all mode signal pattern : cross hatch brightness : MIN (cut-off) contrast : MAX £üC1£ü,£üC2£ü¡Â2.0mm, £üD1£ü,£üD2£ü¡Â2.0mm 4-2-6 Tilt adjustment frequency : all mode signal pattern : cross hatch brightness : MIN (cut-off) contrast : MAX 4-2-7 Degaussing adjustment Don't adjust the degaussing.
  • Page 15 4-3 Color adjustment 4-3-1 color temperature ¡Ø Set condition - measuring instrument : color analyzer (CA-100) - frequency : 640 * 480 (60Hz) - display pattern : full white , one square(20% window) - brightness : cut off - contrast : MAX ¡Ø...
  • Page 16 1. Select factory mode. 2. Select COLOR TEMP with UP,DOWN key. 3. Select 9300K. 4. Select B-G with UP,DOWN adjust y=0.311 and do the next selection with EXIT key. 6. Select R-G with UP,DOWN adjust x=0.281 and do the next selection with EXIT key.
  • Page 17 4. Select B-G with UP,DOWN adjust y=0.329 and do the next selection with EXIT key. 6. Select R-G with UP,DOWN adjust x=0.313 and do the next selection with EXIT key. 4-3-4 brightness uniformity adjustment ¡Ø set condition - frequency : 640 * 480 (60Hz) - display pattern : 9 ball pattern - brightness : MIN (cut off) - contrast : MAX...
  • Page 18 set condition - direction : east - frequency : included timing chart - display pattern : full white - brightness : MIN (cut off) - display center Most suitable x=0.640 ¡¾ 0.015 y=0.323 ¡¾ 0.015 GREEN x=0.295 ¡¾ 0.015 y=0.594 ¡¾ 0.015 BLUE x=0.142 ¡¾...

  • Page 19: Troubleshooting Guide

    5. TROUBLESHOOTING GUIDE 5-1. Troubleshooting Guide. NOTES ; 1. If picture does not appear, fully rotate the brightness and contrast controls clockwise. 2. Check the following circuits. No raster appear : power circuit. Horizontal output circuit. High voltage control circuit and output circuit. High voltage develops but no raster appears : Video output circuit.
  • Page 20 5-2-3 Degaussing failure Check degauss Connector(CN102) Check output voltage at pin 12 of IC502 Replace IC502 (Normal : 0V, Degaussing: 5V) Does DC voltage right? Check and replace Q101,D101,RL101,R101 5-2-3 Purity failure Degaussing Purity is O.K Done Degaussing circuit Refer to 5-2-2 is right? Replace CRT and verify purity...
  • Page 21 5-2-4 Rotation Failure Check tilt connection (CN402) IC 502 pin 35 output varies with different values? Check and replace IC502 (DC 0V ¡- 5V) Q403,Q401,Q402 Check and replace varies with different values? Q403,Q401,Q402 Check and replace R-COIL of the CPT 5-2-5 Misconvergence Failure Try readjusting convergence Is the convergence...
  • Page 22 5-2-6 H-Linearity Failure Check pin 36 of IC502 output varies with different value? Check and replace IC502 (DC 0V ¡- 5V) Check Q702,Q701 output Check and replace varies with different value? Q702,Q701 Check L304 output varies with different value? L304 5-2-7 High Voltage Failure Does 900Vp-p fly back pulse Check and replace...
  • Page 23 5-2-8 User control Failure Others Check the voltage at pin 21 of IC502 Normal : 5V Push the EXIT Key : 0.5V Push the SEL Key : 1.5V Push the UP Key : 3.5V Push the DOWN Key : 2.5V Check and replace R406,R408,R409,R410 5-2-10 Dynamic Focus Failure or poor Focus...
  • Page 24 5-2-10 Visible Retrace Check Screen control voltage Is Screen voltage (550 ¡¾ 50V) right? and FBT Does Q201 collector pulse Check 80V Line (35Vp-p) exist? Does Q201 base drive Check The G1 wave form exist? Check and replace IC201 Q201 COLLECTOR 5-2-11 ACL Failure Input full white pattern to monitor Check the voltage at pin 2 of IC502?

  • Page 25: Micom Failure

    5-2-12 Micom Failure Does 5V appear Pin6 of IC502? X501 IC502 Pin8 and pin8 wave Check and replace form are right? X501,C512,C513 IC502 Pin 5 is over than Check and replace R507 4.5Volt ? All input/output value Check and replace IC502 are right? Done 5-2-13 No Raster...

  • Page 26: No Video

    5-2-14 No Video Check signal cable and connector IC802 Pin5,Pin8,Pin10 video Check R,G,B Cable input are right? conector Check and replace IC802 Pin21,Pin24,Pin26 IC802 video output are right? Q802R,G,B Check Q803 and video output are right? 12V,80V Line R,G,B cathode wave Check R806R,G,B and forms are right? Q801R,G,B...
  • Page 27 5-2-15 Abnormal & Invariable H-size IC 301 Pin24 output Check and replace IC301 parabola level variable? and 12V,80V Line? Does T303 Pin8 pulse Check and replace T303? is appear?? Check some parts around T702 are they OK? Check and replace Q710? IC301 24pin 5-2-16 OSD failure...
  • Page 28 5-2-17 V-deflection failure Does 12V DC appear at Pin2 of IC201? Refer to No power supply Does -12V DC appear at Pin5 of IC201? IC 301 Pin 13,Pin 23 Check and replace IC301? output exist? IC 502 Pin 33 output Check and replace IC502? exist? Check and replace IC201?

  • Page 29: Part List

    6. PART LIST 6-1. KT-1982F PART PIST 10 2 -2 9 1 4 11 0 1 0 K T -29 1 4 F,K O R T E K M A INP C BAS S 'Y M A INM A N U A L 10 9 -1 3 1 5 30 P 2 0 1 9 N 2 0 F E T 1 P C SQ 7 0 8...
  • Page 33 30 7 -1 2 2 9 14 1 0 0 K T -29 1 4 ,K O R TE K S -M A N U A LT AC TA S S 'Y 1 P C ST A C TS WP C B 32 1 -1 1 1 0 00 J 4 A 1 /6 W1 0 0 O H M R E S .

  • Page 34: Block Diagram

    7. BLOCK DIAGRAM SWITCHING INLET VIDEO AMP R,G,B IC ( 6S1265R) 6.3V SWITCHING SOCKET VIDEO INPUT ( KA2506 ) OUTPUT MODE POWER PROCESSOR BRIDGE -14V LINE ( WT6802 ) CUT-OFF DIODE FILTER SUPPLY CONTROL 130V FEEDBACK I©÷ C I©÷C CONTROL DEGAUSSING 250V I©÷...

  • Page 35: Connecting Diagram

    8. CONNECTING DIAGRAM * CN407 & CN409orCN406= GGA/EGA * CN405 & CN404= VGA/SVGA 15PIN VGA SIGNAL IN CN407 CN404 CN405 ¨Ø CN406 5PIN,6PIN SIGNAL INPUT CN401 CN801 CN409 ¨Ø ¨Ø PIN NO. CN4 06 CN409 ¨ç R-IN R-IN ¨è G-IN G-IN ¨é...

  • Page 36: Schematic

    9. SCHEMATIC R102 TH101 180K,1W 9OHM Q101 130V 12V 5 V 6.3V CN411 CN801 5V 6 .3V 12V L801 130V R101 KSC1008 R103 CN411 1 47,1/4W R802 DEGAUSS R104 R105 220K R106 130V 6.8K C103 SDA SCL L802 C801 100U,16V CN102 D101 Q801...

  • Page 37: Print Circuit Board

    10. PRINT CIRCUIT BOARD 10-1 MAIN 247mm 247mm...
  • Page 38 10-2 VIDEO 98mm 128mm 25mm 150mm...

This manual is also suitable for:

Kt-2914dfKt-2114fKt-2114df

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