Kortek KT-1782DF Service Manual Download Page 24 | Manualshive

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NO

YES

Input full white pattern to monitor

Check the voltage at pin 2 of IC501?

(PWM WAVE FORM)

Check replace IC501

Q707 base input exists?

Check replace

Q707, 12V

Check and replace pin

12 of the IC802?

NO

YES

YES

5-1-12 ACL Failure

Is G2 voltage (580

±

50V) right?

Check G2 control

voltage

and FBT

Does Q201 collector pulse

(35Vp-p) exist?

Check 80V Line and D719,C726

Does Q201 base drive

wave form exist?

Check The G1

Check and replace IC201

NO

YES

NO

YES

NO

YES

5-1-11 Visible Retrace

Q201 COLLECTOR

G1

IC501 2pin PWM

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Summary of Contents for KT-1782DF

Page 1: ...SERVICE MANUAL COLOR CRT MONITOR KT 1982F KT 1982DF KT 1782F KT 1782DF KT 2182F KORTEK CORPORATION DOC NO KT XX82X SM DATE 2004 02 02 REV NO 0 REV DATE ...

Page 2: ...TIONS 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 SCHEMATIC 36 10 PRINT CIRCUIT BOARD 38 CONTENTS ...

Page 3: ...tage can produce potentially hazardous X Ray RADIA TION To avoid such hazards the high voltage must be above the specified limit The nominal value of the High voltage of this Monitor is 26KV 0 3KV at zero beam current minimum brightness under a 120V AC power source The High Voltage must not under any circumstances exceed 29KV Each time a monitor requires servicing the High Voltage should be checke...

Page 4: ...Watt resistor paralleled by a 0 15Uf capacitor in serial with an exposed metal chassis part and a known earth ground such as an electrical conductor and electrical ground connected to a earth ground c Use a SSVM or VOM with 1000 ohms per volt or sensitivity to measure the AC voltage drop across the resistor d Connect the resistor to an exposed metal part having a return path to the chassis metal c...

Page 5: ...the wrong direction may cause excessive X ray emissions WARNING 3 An electrolytic capacitor installed with the wrong polarity might explode 1 Servicing precautions are printed on the chassis and should be followed closely 2 Always unplug the units AC power cord from the AC power source before attempting to a remove or reinstall any component or assembly b disconnect PCB plugs or connectors c conne...

Page 6: ...V 60 50 3Hz Power Consumption Nomal Operation Input Current at 120V Input Current at 240V 100 Watts Operating 1 5Amps rms Turn on 30Amps Peak Operating 0 8Amps rms Turn on 60Amps Peak Linearity Cross Pattern Horizontal 5 Vertical 5 Environment Temperature Humidity Operating 0 to 40 Storage 40 to 60 Operating 10 to 85 Storage 5 to 95 KT 1982F KT 1982DF KT 1782F KT 1782DF KT 2182F Tube 19 Normal fla...

Page 7: ...UB SIGNAL CABLE SPECIFICATION PIN NO PIN NAME 1 RED 2 GREEN 3 BLUE 4 GND 5 GND DDC 6 R GND 7 G GND 8 B GND 9 N C 10 SELF RASTER 11 GND 12 SDA DDC 13 H SYNC 14 V SYNC 15 SCL DDC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ...

Page 8: ...0 508 0 119 0 635 POL NEG NEG POS POS POS POS POS NEG POS NEG NEG POS NEG POS V f Hz 70 087 59 940 86 906 72 809 60 317 75Hz 72 188 60 00 85 061 70 00 60 00 84 997 75 025 100 00 O mS 14 268 16 683 11 50 13 735 16 58 13 333 13 853 16 667 11 756 14 272 16 640 11 765 13 329 10 000 P mS 0 064 0 064 0 113 0 079 0 11 0 064 0 125 0 124 0 056 0 106 0 047 0 044 0 038 0 037 Q mS 1 080 1 048 0 563 0 740 0 61...

Page 9: ... 9 3 1 FRONT FRAME 3 2 MAIN PCB ASS Y 3 Operating Instruction KORTEK STANDARD FRAME X FRAM MAIN PCB SOCKET PCB CONTROL PCB ...

Page 10: ... the MENU disappears This button is used to select the control item on the MENU In MENU the control item could be selected and unselected by this button EXIT This button is used to exit the value of any selected control UP This button is used to increase the value of any selected control This button is used to locate to the next control item for select DOWN This button is used to decrease the valu...

Page 11: ...hout signal Adjustment 26KV 0 3KV PROCEDURE Disconnect the AC line cord from the power source Connect positive end of High Voltage probe to anode cap of CRT negative end of to GND main chassis First of all Disconnect AC cord and than disconnect High voltage probe 5 Screen Voltage signal 1024 x 768 48KHz Full white Bright max Contrast max Adjustment SAMSUNG SDI 580 10V 4 1 2 TURN ON THE FACTORY OSD...

Page 12: ...3 Press the MENU SELECT button 4 UP or DOWN button is used to control the value of any function 5 When you press exit button the MENU disappears 4 2 1 Screen center adjustment width 21 400mm 19 360mm 17 320mm height 21 300mm 19 270mm 17 240mm signal 1024 x 768 48KHz A B 4 0mm C D 4 0mm a Horizontal size adjustment adjustment use to H SIZE BRIGHTNESS 31 4KHz 60Hz DISPLAY AREA SQUARE CORNER A D C B ...

Page 13: ...to H POS d Vertical position adjustment 4 2 2 Trapezoid adjustment frequency all mode signal pattern cross hatch 4 2 3 Pin balance adjustment frequency all mode signal pattern cross hatch 4 2 4 Parallelogram adjustment frequency all mode signal pattern cross hatch A B A B A B 2 5mm D1 D2 D1 D1 D2 1mm 5mm ...

Page 14: ...m 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 Degaussing is possible in OSD adjustment menu After using this function once You must use again after at least 30minutes 4 2 8 SAVE ADJUSTMENT CONDITION REMOVE USER MODE D1 C1 C2 D2 ...

Page 15: ...dition frequency 48KHz 60Hz 1024 x 768 display pattern back raster pattern brightness MIN cut off contrast MAX 1 Select factory mode 2 Select COLOR TEMP with UP DOWN key 3 Select 9300K 4 Adjust back raster brightness to 0 2 0 8 F L with VR701 5 Select B B with UP DOWN adjust y 0 311 and do the next selection with EXIT key 6 Select R B with UP DOWN adjust y 0 281 and do the next selection with EXIT...

Page 16: ... Select contrast icon with UP DOWN key adjust contrast to 50 60f l with UP DOWN key 8 Select ACL key A C in full white pattern and adjust ACL to 28 30f l attention If 50f l doesn t adjust in 20 window adjust G G again with DOWN key 4 3 3 color adjustment 6500K a white balance adjustment 1 Select factory mode 2 Select COLOR TEMP with UP DOWN key 3 Select 6500K front cabinet back raster 20 window pa...

Page 17: ...MIN cut off contrast MAX Measure nine brightness display in the screen 4 3 5 Focus adjustment set condition frequency 48KHz 60Hz 1024x768 display pattern H character brightness min cut off contrast max 1 Adjust in focus of whole screen to be the best fitted with FOCUS V R in FBT 4 3 6 PURITY adjustment Purity is that unnecessary colors appear in the screen except displayed color Don t appear unnec...

Page 18: ...rection east frequency included timing chart display pattern full white brightness MIN cut off display center Most suitable RED x 0 640 0 015 y 0 323 0 015 GREEN x 0 295 0 015 y 0 594 0 015 BLUE x 0 142 0 015 y 0 066 0 015 ...

Page 19: ...4V 12V 6 3V 5V Lines Does each output appear Measure 80V output between cathode of D120 and Ground Does appear 80V DC Check and replace F801 D801 IC811 IC812 Check and replace D115 D121 D120 D107 IC103 IC101 Check Video and Horizontal circuits 5 1 1 No Raster No Video NO YES Check S1 S2 S3 S4 signals refer to S correction table on the schematic S1 S2 S3 S4 signal are right at each frequency block ...

Page 20: ... 1 2 Replace CRT and verify purity YES YES NO NO Check degauss Connector CN101 Check output voltage at pin 12 of IC501 Normal 0V Degaussing 5V Does DC voltage right Check and replace Q101 D101 RL101 R106 Replace IC501 YES YES NO 5 1 3 Degaussing failure 5 1 3 Purity failure ...

Page 21: ...e convergence now within spec YES NO NO YES NO NO 6 1 6 Misconvergence Failure Check tilt connection CN100 IC 501 pin 35 output varies with different values DC 0V 5V Check and replace R COIL of the CDT Check and replace IC105 Check and replace IC501 IC105 pin 10 11 output varies with different values DC 1 5V 7 5V YES NO NO YES 5 1 4 Tilt Failure ...

Page 22: ... and replace D708 709 Pin 9 of IC701 pulse exist Replace IC701 YES NO YES NO NO YES YES NO NO 6 1 8 High Voltage Failure Check pin 36 of IC501 output varies with different value DC 0V 5V Check pin 7 8 of IC105 output varies with different value DC 1V 6V Check and replace IC501 Check and replace IC105 Check L304 output varies with different value NO YES YES NO 6 1 7 H Linearity Failure L304 Q701 Q7...

Page 23: ...y 2 5V Check and replace R401 R403 R405 R406 NO 5 1 9 User control Failure Check the wave form at Q705 Collector Does appear parabola wave form Check and replace IC301 Does IC301 32 pin wave form exist Check and replace R725 C720 T702 wave form is right Try Readjusting double Focus Done Check and replace T702 Replace the CRT and verify focus YES NO NO YES YES NO NO IC301 32 pin T702 ...

Page 24: ...Q707 12V Check and replace pin 12 of the IC802 NO YES YES 5 1 12 ACL Failure Is G2 voltage 580 50V right Check G2 control voltage and FBT Does Q201 collector pulse 35Vp p exist Check 80V Line and D719 C726 Does Q201 base drive wave form exist Check The G1 Check and replace IC201 NO YES NO YES NO YES 5 1 11 Visible Retrace Q201 COLLECTOR G1 IC501 2pin PWM ...

Page 25: ... Does flyback pulse at collector of Q302 appear Check the Pin 26 of IC301 Does 12Vp p pulse appear Check D309 D311 and 80V Line Check and replace IC301 Does the wave form at pin 8 of T302 appear Check and replace Q304 Q303 Q305 Check the voltage PIN 7 of IC302 Does 12V DC appear Check the 12V line Check heater voltage 6 3V YES YES YES YES 5 1 14 No Raster NO NO NO NO NO Does the wave form at pin 4...

Page 26: ...ght Check and replace IC802 IC803 Pin5 Pin3 Pin1 video output are right Check IC803 and 12V 80V Line R G B cathode wave forms are right Check D805 807 and D814 D816 G2 voltage are right 580 50V Check G2 CDT socket FBT G1 voltage are right 45 10V Check and replace CRT YES YES YES YES YES YES YES 5 1 15 No Video NO NO NO NO NO B OUT Cathode wave form ...

Page 27: ...ENU botton IC501 Pin7 Pin8 wave forms are right Check IC501 and SDA SCL Line Check and replace IC802 NO YES YES NO YES YES NO 5 1 17 OSD failure IC 301 Pin24 output parabola level variable Check and replace IC301 and 12V 80V Line Does T303 Pin8 pulse is appear Check and replace T303 Check some parts around T301 are they OK Check and replace Q314 NO YES YES NO YES 5 1 16 Abnormal Invariable H size ...

Page 28: ...appear at Pin5 of IC201 Refer to No power supply IC 301 Pin 13 Pin 23 output exist IC 501 Pin 33 output exist Check and replace IC301 Check and replace IC201 YES NO YES NO YES Check and replace IC501 NO 5 1 18 V deflection failure IC201 6 pin IC201 1 pin ...

Page 29: ...0478T KME 50V 47 UFT P CAP ELECT 3 EA C314 C703 C715 1 26 81590121T DC50V SL 121UF J T P CAP CERAMIC 1 EA C315 1 23 70B90332T 100V 332J T P CAP MYLAR 1 EA C317 1 23 70B90103T 100V 103J T P DI OY CAP MYLAR 1 EA C318 1 23 70B90473T 100V 473J T P CAP MYLAR 3 EA C323 C346 C716 1 26 81590681T DC50V SL 681PF J T P CAP CERAMIC 1 EA C326 1 23 33R90272B DTMS YPN 1 6KV 272J CAP METAL 2 EA C327 C328 1 23 70B...

Page 30: ...ORE 1 EA L702 1 34 1504R7001 4 7UH COIL CHOKE KT 1982 1 EA L703 1 39 220510001 KT XX82 REV NO 7 MAIN PCB 1 EA MAIN PCB 1 30 3M1008TAX KSC1008 Y TR 1 EA Q101 1 30 3M0945TAX KSC945C Y TR 8 EA Q103 Q105 Q201 Q303 Q307 Q309 Q311 Q313 1 30 2P1273TBX KTA1273 Y TR 1 EA Q104 1 30 1J0733TAX KSA733C Y TR 2 EA Q301 Q305 1 30 4F5584BNX 2SC5584 FJL6820TU TR 1 EA Q302 1 30 8Z0008BDX FQP4N20 FET 1 EA Q304 1 30 8...

Page 31: ...1000J4A 1 6W 100 KOHM RES CARBON 4 EA R334 R338 R342 R347 1 21 308200JCB 2W 82 OHM RES MOR 1 EA R349 1 21 312200JEF 3W 220 OHM RES MOR 1 EA R352 1 21 131200F4A 1 6W 12 KOHM1 RES METAL 2 EA R355 R712 1 21 132200F5A 1 4W 22 KOHM1 RES METAL 1 EA R356 1 21 117500J4A 1 6W 750 OHM RES CARBON 1 EA R359 1 21 8002R2J8A 1 2W 2 2 OHM RES FUSEBLE 1 EA R360 1 21 802200J8A 1 2W 22 OHM RES FUSEBLE 1 EA R361 1 21...

Page 32: ... DIODE 1 EA D823 2 11 WT6802XAA WT6802 IC OSD 1 EA IC801 2 11 KA2506XAA KA2506 IC PREAMP 1 EA IC802 2 11 LM2405TBA LM2405T IC PREAMP 1 EA IC803 2 43 880052R0T 52 mm TAPING JUMP WIRE 21 EA J801 J807 J811 J819 J821 J825 2 34 240470001 CFI06B1H470MF EMI FILTER 3 EA L801 L804 L806 2 34 22030R47X AL03 TB0 47K 0 47UH INDUCTORS 3 EA L802 L803 L805 2 30 3B3904TAX 2N3904 TA TR 2 EA Q801 Q802 2 30 2Z0033TAX...

Page 33: ...J 250V 474J 250V 424J 250V 684J 250V 3 C340 CAP MPP 254J 250V 224J 250V 204J 250V 204J 250V 254J 250V 4 C341 CAP MPP 104J 250V 823J 250V 104J 250V 104J 250V 104J 250V 5 C343 CAP MPP 274J 250V 274J 250V 204J 250V 204J 250V 394J 250V 6 C724 CAP MPP 103J 250V 103J 250V 103J 250V 103J 250V 473J 250V 9 R321 RES METAL F 1 2 3W 1 2 3W 1 2 3W 1 2 3W 1 0 3W 10 R314 RES METAL F 15 3W 15 3W 15 3W 15 3W 4 7 3...

Page 34: ...ICAL OUTPUT KA2142 TLIT CONTROL TILT COIL DEFLECTION YOKE VIDEO AMP KA2506 HIGH VOLTAGE REGULATION OSD PROCESSOR WT6802 VIDEO OUTPUT LM2405 CUT OFF CONTROL SIGNAL INPUT MICRO CONTROLL ER UNIT WT62P1 ADJUS T KEY DDC 2BI H V SIZE H V POSI S PIN TRAP PARA PIN BAL ACL TILT DEG LED CONTROL H V SYNC INPUT DPMS OUTPUT SUSPEND OFF S CORRECTI ON CIRCUIT S1 S4 SYNC PROCESSOR TDA9113 or STV6888 I C I C I C I...

Page 35: ... 2 AC AC 1 2 AC AC POWER CORD DEGAUSSING COIL 1 GND 2 KEY 3 LED 4 5V 1 GND 2 KEY 3 LED 4 5V 1 GND 2 SDA 3 SCL 4 SELF 5 V SYNC 6 H SYNC 15P D SUB CABLE 1 2 3 TILT TILT TILT TILT CN100 CN103 CN101 CN502 CONTROL PCB CN503 FBT CN120 HI VOLTAGE H FOCUS V FOCUS G2 CN801 SOCKET PCB CN401 R 1 R GND 2 G 3 G GND 4 B 5 B GND 6 ...

Page 36: ...16V C103 14V 1 390 1 2W R109 14V 12V 14V 1 14V 220V 80V 80V 2 2U 450V C713 6 3V 100 R726 27K R740 330 R722 15K R724 12V 22K R723 1 2 C O M P 3 D E A D 4 C T 5 R T 6 G N D 7 C1 8 E 1 9 C2 10 C2 11 V C C 12 O U T 13 V R E F 14 15 16 KA7500B IC701 C O M P 1 VFB 2 ISENSE 3 RT CT 4 G N D 5 O U T 6 VI 7 V R E F 8 KA3883C IC302 0 1U 50V C122 33U 50V C123 200K 1 2W R117 4 7 1 4W R131 1U 50V C131 6 8K R136...

Page 37: ...M C 8 0 8 1 2 K R 8 5 4 1 0 0 R 8 5 5 1 0 0 R 8 6 0 6 8 0 R 8 1 2 1 N 4 1 4 8 D 8 0 1 1 0 K R 8 0 5 1 2 3 2 N 3 9 0 4 Q 8 0 2 1 K R 8 0 7 1 K R 8 0 1 5 V 1 1 2 2 3 3 5 5 4 4 6 6 C N 8 0 2 8 0 V 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 1 0 1 0 1 1 1 1 1 2 1 2 1 3 1 3 C N 8 0 1 6 3 V 5 V 1 2 V B D 8 0 1 3 3 U 5 0 V C 8 3 4 2 2 0 U 1 6 V C 8 1 5 1 2 3 2 N 3 9 0 4 Q 8 0 1 6 8 0 R 8 0 2 5 V 4 7 U 1 0 0 V C ...

Page 38: ... 38 10 PRINT CIRCUIT BOARD 10 1 MAIN 196mm 246mm ...

Page 39: ... 39 10 PRINT CIRCUIT BOARD 10 2 VIDEO 107mm 150mm 30mm 128mm 98mm ...

Page 40: ... 40 110mm 13mm 248mm 61mm 82 5mm 13 8mm 84mm 196 8mm 68mm 60 5mm 68 3mm 10 3 PCB DIMENSION 10 PRINT CIRCUIT BOARD ...

Page 41: ... 41 84 5mm 68 5mm ...

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