Tatung VM7K9 Service Manual
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Tatung VM7K9 Service Manual

Tatung VM7K9 Service Manual

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Model VM7K9
(With PFC)
SERVICE INFORMATION

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Summary of Contents for Tatung VM7K9

  • Page 1 Model VM7K9 (With PFC) SERVICE INFORMATION...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE 1. SPECIFICATIONS ..................... 2. PRECAUTION AND NOTICES ................2-1 SAFETY PRECAUTIONS ................2-2 PRODUCT SAFETY NOTICE ............... 2-3 SERVICE NOTES ................... 2-4 HIGH VOLTAGE WARNING ............... 3. OPERATING INSTRUCTIONS ................4. ADJUSTMENT ......................4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ....... 4-2 MAIN ADJUSTMENTS .................
  • Page 3 1. SPECIFICATIONS FOR 7G SERIES COLOR MONITOR CRT : 43.2CM(17") 90 Deflection, 29mm Neck, Pure flat 0.25mm Dot Pitch, Non-Glare Screen Viewable image Size: 40.6CM (16") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, OSD key, Function knob: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Moire Reduce, Recall, Degaussing, Color Temperature, Volume.
  • Page 4 11. Power Source: Switching Mode Power Supply AC 100 ~240V, 50/60Hz Universal Type 12. Operating Temperature: 0℃ to 40℃ Ambient 13. Humidity : 10% to 85% Relative, Non-Condensing Weight: 17.0 Kgs(Net), 20.5Kgs(Gross) for 7Glr • 17.8 Kgs(Net), 21.5Kgs(Gross) for 7GlrA Dimensions Monitor: Carton: 540(W) ×...

  • Page 5: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS 1. Observe all caution and safety related notes located inside the display cabinet. Operation of the display with the cover removed, may cause a serious shock hazard from the display power supply. Work on the display should not be attempted by anyone who is not thoroughly familiar with precautions necessary when working on high voltage equipment.

  • Page 6: High Voltage Warning

    HIGH VOLTAGE WARNING Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied.

  • Page 7: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 7K color display. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three- wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground.

  • Page 8: Adjustment

    4. ADJUSTMENT 4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS Approximately 30 minutes should be allowed for warm up before proceeding. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory. 4-2 MAIN ADJUSTMENTS FUNCTION LOCATION DESIGNATION...
  • Page 9 FACTORY PRESET H: 36.51kHz V: 51.34Hz 6500 9300 CONTRAST H-MOIRE REDUCE BRIGHTNESS V-MOIRE REDUCE H-CENTER R-GAIN H-SIZE G-GAIN V-CENTER B-GAIN V-SIZE R-BIAS ZOOM G-BIAS Top corner R-BIAS Bottom corner COLOR TEMPERATURE 9300 PINCUSHION COLOR TEMPERATURE 6500 TRAPEZOID DEGAUSS PIN-BALANCE OSD EXIT PARALLELOGRAM RETURN ROTATION...
  • Page 10 G. The setting data of the CONTRAST, BRIGHTNESS, PIN-BALANCE, PARALLELOGRAM, ROTATION, COLOR TEMPERATURE are common mode saved in the memory. Don't needed adjust it individual at every timing Mode and save in the memory. Model select: for factory only, service engineer can't changed. 3.

  • Page 11: Circuit Description

    RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets 6-pole Convergence Magnets 4-pole Convergence Magnets Deflection Yoke 6. Convergence adjustment A. Produce a magenta crosshatch on the display. B. Adjust the focus for the best overall focus on the display. Also adjust the brightness to the desired condition. C.
  • Page 12 On Screen Display Controller The IC103 is designed for display the built-in characters or fonts onto monitor screen. The display operation is by transforming data and control information from micro controller to RAM through a serial data interface. Pin2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R125, C114, R161) and filter (R126, C115) is used to regulate the appropriate bias current for internal oscillator the resonate at specific dot frequency.
  • Page 13 5-4 TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTION AL DESCRIPTION D101 For C102 Discharge Q101 For LED Indicator Control D418 Protection Diode for Snubber Clip Diode ZD401 D431 Protection Diode for B+ Control D405, D424 Speed up for Q403 D406, D407 Supply a bias for D408 D408 Damping Diode and Modulation Diode...
  • Page 14 LOCATION FUNCTION AL DESCRIPTION D706,D708 Rectifier for -200V Supply Q707 Picture Mute Control AMP Q703, Q706 Brightness Control CKT Q708 Vertical Dynamic Focus Control AMP D901 ~ D904 Bridge Rectifier for AC Source D909 Rectifier for Start Power Supply D910 Clip Diode for Snubber CKT D911 IC901 VCC Supply...

  • Page 15: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 60.5V, 14.5V, 80V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL CHECK THE HIGE VOLTAGE REFER ITEM S.M.P.S. OF CRT ABOUT 25.5 ~ 26.5KV CHECK FAILSAFE CKT IC401 PIN 2 RELATIVE CKT.
  • Page 16 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 6, 9, 22 ABOUT 12V CHECK 12V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 15 CLAMP PULSE PIN 16 BLANK PULSE CHECK THE IC105 RELATIVE CIRCUIT OR IC401 PIN 16 OUTPUT...

  • Page 17: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 12V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 18, 20, 23 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB...

  • Page 18: Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF C433, D410, R635, R636, IC105 ON MAIN PCB CHECK IC801 PIN 16 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT Q705, R718, C707 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1.

  • Page 19: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL WIDTH OF VIDEO READJUST H-WIDTH FUNCTION CHECK THE RELATIVE CIRCUIT OF Q404, Q405, & Q406 CHECK FBT B+ VOLTAGE ABOUT 60.5V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. Q911, Q912, Q914, Q915 & IC401 PIN 4, 5, 6, VR 902 CHECK THE HV OF CRT ABOUT 26KV...

  • Page 20: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 7 ABOUT 40V CHECK ZD601, ZD602 R626 & SMPS RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK IC401 PIN 22, 23, 24 CHECK IC601 PIN 6 OUTPUT ABOUT CHECK IC401 PIN 12, 13 38Vpp RELATIVE CIRCUIT...

  • Page 21: Poor Focus

    6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT 6-9 NO SOUND (FOR AUDIO MODEL ONLY) CHECK IC501 ADJUST VOLUME CONTROL PIN 14 ABOUT 14V CHECK POWER SUPPLY CIRCUIT ENSURE THE SOUND SOURCE IS POWER ON CHECK IC501 IC501 FAILURE...

  • Page 22: Power Supply Trouble Shooting Chart

    6-10 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60.5V - 145V EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 14.5V, 24V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 23: Mechanical Of Cabinet Front Dis-Assembly

    7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...

  • Page 24: Parts Listing

    PARTS LIST OF CABINET Location P790T2 Spection CM790T13PFC CHASSIS FOR P790T2-1 PFC 1A 503- 1- 47 SCREW (CRT) 5A 38- 8 RUBBER WASHER 11A 112-500 WIRE MOUNT 11A 115- 1 FBT CLIP 12A 381-500 RUBBER FOOT 19A 403- 7 STEEL 19A 506- 5 SPRING 33A3663- 1...
  • Page 25 B1A1040- 10-128 SCREW 4*10 D1A1140- 7-128 SCREW 4X7(FOR AC) M1A1140- 6-128 SCREW 705A785P-C57- 03 Q425 ASS'Y 705A785S-C87- 01 AC IN SOCKET (CN901) 705A790P-C79-01B FBT ASS'Y FOR P790S2/TS 705A790P-C93- 02 D921 ASS'Y 705A790S-C57- 03 Q901 ASS'Y FOR P790T2-1 705A790T-C57-05A Q403/Q405/Q911/D408 ASS' 705A795P-C56- 01 IC601 ASS'Y 705A795P-C56- 02...
  • Page 26 IC101 56A1125-41A IC102 56A1133- 14 AT24C08-10PC IC102 56A1133- 19 SLA24C08-D EEPROM ICS IC103 56A1131- 5 MTV016N IC105 56A74LS- 14- H 14 PIN IC 74LS14 IC401 56A 552- 1 TDA4856 BY PHILIPS IC403 56A 212- 2 QUAD.OP.LM324N 14P IC/S. IC403 56A 212-501 HA17324/HITACHI IC404 56A 212- 2...
  • Page 27 95A205T- 30-06A Wire Harness ▲ SW901 77A 267- 12- HJ PUSH-PUSH SWITCH (TV-5) T401 79A 167-110- H DRIVER TRANSFORMER T401 79A 167-110- L Drive Transformer T701 79A 167-112- LA DRIVER TRANSFORMER T701 79A 167-112- SA Driver Transformer ▲ T901 80A 769- 2- LA S769FLA/S785FLA T903 79A 167-111- GA...
  • Page 28 C407 65A 442-101- 1T 100PF J NPO 50V C408 63A212J-473-2AT 0.047 250V +-5% C408 64A176J-473- 2T 0.047UF 5% 250V MPE C409 67A 309-100- 7T 10UF +-20% 50V C410 65A 442-470-13T 47PF +-5% NPO 50V C412 65A 444-101- 5T 100 PF 10% 50V Y5P C412 65AUP05-101- 2T 100PF/50V.X7R +-10%...
  • Page 29 C719 67A215K-828- 9T 0.82uF/100V C719 67A215K-828-9HT 0.82UF 100V ?M?üTT C905 67A 305-229- 7T 2.2UF +-20% 50V C906 65A 444-681- 5T 680PF 10% 50V Y5P C906 65AUP05-681- 2T 680PF/50V X7R +-10% C914 67A 305-100- 7T 10UF +-20% 50V C916 67A 305-101- 4T 100UF +-20% 25V C918 64A176J-332- 0T...
  • Page 30 D418 93A 64- 11-52T DIODE 1N4148 D418 93A 64-11F-52T SWITCH DIODE IN4148 D418 93A 64-11H-52T DIODE 1N4148/HITACHI D418 93A 64-11P-52T 1N4148/PHILIPS D419 93A 60-21P-52T PS156R D419 93A 60-21T-52T FR155 D421 93A 64- 11-52T DIODE 1N4148 D421 93A 64-11F-52T SWITCH DIODE IN4148 D421 93A 64-11H-52T DIODE 1N4148/HITACHI...
  • Page 31 FB401 95A 90- 23 TIN COATED FB903 71A 55- 9- T SHIELD BEAD FB904 71A 55- 19- T BEAD J001 71A 55- 19- T BEAD J002 95A 90- 23 TIN COATED J003 95A 90- 23 TIN COATED J004 95A 90- 23 TIN COATED J005 95A 90- 23...
  • Page 32 J075 95A 90- 23 TIN COATED J076 95A 90- 23 TIN COATED J077 95A 90- 23 TIN COATED J078 95A 90- 23 TIN COATED J079 95A 90- 23 TIN COATED J080 95A 90- 23 TIN COATED J081 95A 90- 23 TIN COATED J082 95A 90- 23...
  • Page 33 Q702 57A 420- P- T TRAN 2SA733P/NEC TAPING Q703 57A 420- P- T TRAN 2SA733P/NEC TAPING Q704 57A 419- P- T TRAN 2SC945P/NEC TAPING Q705 57A 419- P- T TRAN 2SC945P/NEC TAPING Q706 57A 498- 1- T TRAN BF423 TAPING PHILIP Q707 57A 721- 1- T DTC114ES ROHM...
  • Page 34 R408 61A 172-472-52T 4.7K OHM 5% 1/4W R409 61A 172-562-52T 5.6K OHM 5% 1/4W R410 61A 602-221-52T 220 OHM +-5% 1/6W R411 61A 172-104-52T 100K OHM +-5% 1/4W R412 61A 602-101-52T 100 OHM 5% 1/6W R413 61A 210-153-52T 15K OHM 1% 1/6W R414 61A 602-222-52T 2.2K OHM +-5% 1/6W...
  • Page 35 R704 61A 172-182-52T 1.8K OHM 5% 1/4W R705 61A 602-101-52T 100 OHM 5% 1/6W R706 61A 602-100-52T 10 OHM +-5% 1/6W R707 61A 602-103-52T 10K OHM 5% 1/6W R708 61A 602-823-52T 82K OHM +-5% 1/6W R709 61A 602-103-52T 10K OHM 5% 1/6W R710 61A175L-150-52T 15 OHM 5% 1/2W...
  • Page 36 R983 61A 602-223-52T 22K OHM 5% 1/6W ZD101 93A 39- 73-52T HZ6B1/HITACHI ZD401 93A 39- 80-52T HZ9C1/HITACHI ZD401 93A 39-129-52T ZD RD9.1EB3/NEC TAPI ZD402 93A 39- 73-52T HZ6B1/HITACHI ZD406 93A 39- 77-52T HZ5C1 ZD601 93A 39- 58-52T ZD HZ24-2/HITACHI ZD602 93A 39- 58-52T ZD HZ24-2/HITACHI ZD702...
  • Page 37 C821 67A 305-101- 3T 100uF +-20% 16V 105C C822 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C823 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C824 65A 442-330-13T 33PF +-5% NPO 50V C825 65A 450-473- 4T 47000PF -20 +80% 50V Z5V C826 65A 450-473- 4T 47000PF -20 +80% 50V Z5V...
  • Page 38 D813 93A 64- 11-52T DIODE 1N4148 D813 93A 64-11F-52T SWITCH DIODE IN4148 D813 93A 64-11H-52T DIODE 1N4148/HITACHI D813 93A 64-11P-52T 1N4148/PHILIPS D814 93A 64- 19-52T DIODE 1SS83/HIACHI D814 93A 64-19G-52T BAV21/G.I D814 93A 64-507-52T FAST RECOVERY DIODE BAV2 D815 93A 64- 19-52T DIODE 1SS83/HIACHI D815 93A 64-19G-52T...
  • Page 39 J816 95A 90- 23 TIN COATED J817 95A 90- 23 TIN COATED J819 95A 90- 23 TIN COATED J820 95A 90- 23 TIN COATED J821 95A 90- 23 TIN COATED J822 95A 90- 23 TIN COATED J823 95A 90- 23 TIN COATED L801 73A 54-189-10T...
  • Page 40 R847 61A 602-270-52T 27OHM +-5% 1/6W R848 61A175L-101-52T 100 OHM +-5% 1/2W R849 61A175L-101-52T 100 OHM +-5% 1/2W R850 61A175L-101-52T 100 OHM +-5% 1/2W R851 61A 602-682-52T 6.8K OHM 5% 1/6W R852 61A 602-682-52T 6.8K OHM 5% 1/6W R853 61A 602-682-52T 6.8K OHM 5% 1/6W R854 61A 602-330-52T...
  • Page 41 ▲ D902 93A 52- 55 1N5408/FAGOR ▲ D902 93A 52-55P-52T 1N5408 PEC ▲ D903 93A 52- 55 1N5408/FAGOR ▲ D903 93A 52-55P-52T 1N5408 PEC ▲ D904 93A 52- 55 1N5408/FAGOR ▲ D904 93A 52-55P-52T 1N5408 PEC D907 93A3060-500 RG4A SANKEN DF907 71A 55- 2 FERRITE BEAD...

  • Page 42: Block Diagram (Deflection)

    Location 705A790TC5705 Q403/Q405/Q911/D408 A 32A3028- 8 MICA 90A 363-516 HEAT SINK M1A1130- 8-128 SCREW 3.0X8 M1A1730- 10-128 SCREW M3x10 D408 93A 220- 17 FMQ-2FUR 95A205T- 30-06A Wire Harness Q403 57A 706- 7 2SC5521Z Q405 57A 415- 1 TR.NPN TIP122/FAIRCHILD Q911 57A 600-504 POWER MOSFET IRF634A FAI Q911...

  • Page 44: Ic Block Diagrams

    10. IC BLOCK DIAGRAM IC101 IC403/IC404 UM6861 LM324 DAC2 VSYNC1/INTV OUTPUT 1 OUTPUT 4 INVERTING INVERTING DAC1 HSYNC1 INPUT 1 INPUT 4 NON-INVERTING NON-INVERTING DAC0 DAC3 INPUT 1 INPUT 4 RESET_ DAC4 NON-INVERTING NON-INVERTING DAC5 INPUT 2 INPUT 3 INVERTING INVERTING DAC6 INPUT 2...
  • Page 45 IC401 TDA4856 EW-OUTPUT V-SYNC INPUT VERTICAL EHT COMPENSATION V-OUTPUT V-SYNC H-PINCUSHION AND POLARITY OSCILLATOR INTEGRATOR H-SIZE AND V-SIZE H-CORNER CORRECTION AND AGC V-LINEARITY H-TRAPEZIUM V-LINEARITY BALANCE H-SIZE VIDEO V-POSITION CLAMPING V-SIZE,VOVSCN AND V-BLANK HUNLOCK OUTPUT PROTECTION OUTPUT ASYMMETRIC AND SOFT START EW-CORRECTION I C-BUS FOCUS...
  • Page 46 IC601 TDA4866 GUARD GUARD FLYBACK CIRCUIT GENERATOR AMPLIFIER A OUTA PROTECTION INPUT STAGE FEEDB AMPLIFIER B OUTB IC901 3842 SET/ Vref Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S. COMP COMP. LATCH OSCILLATOR Ct/Rt IC905 IC102 TL431 ST24W04 PRE 1 REFERENCE CATHODE MODE/WC...
  • Page 47 IC103 MTV016/MTV018 8 DATA DATA CCS0 DISPLAY & ROW CCS1 SERIAL DATA DAEN CONTROL BLINK INTERFACE 2 RAEN CAEN REGISTERS CRADDR VDDA LUMA VSSA CHARACTER ROM BORDER 5 RCADDR ARWDB ADDRESS BUS HDREN 9 DADDR LUMINANCE & VDREN BORDGER ADMINISTRATOR VCLKS 5 WADDR NROW...

  • Page 48: Pcb Layout

    11 PCB LAYOUT 11-1 MAIN PCB LAYOUT...

  • Page 49: Schematic Diagram

    11-2 CRT BOARD LAYOUT 11-3 PFC BOARD LAYOUT...
  • Page 50 6 5 4 3 2 H803 1 2 3 4 5 6 7 CRPC-S769R IC801 P801 R819 C840 R817 W301 TDA4886 C808 R860 R881 100V 120K D803 (NC) 1/4W C802 1/4W 1N4148 CMPC-P790S R807 R818 C809 Q850 D856 J810 C856 BF422 OSD-R F/R1...

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