Tatung VM9G5DA S995T Service Manual
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Tatung VM9G5DA S995T Service Manual

Tatung VM9G5DA S995T Service Manual

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COLOUR MONITOR
FLAT SCREEN
VM9G5DA S995T
Service Information

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Summary of Contents for Tatung VM9G5DA S995T

  • Page 1 COLOUR MONITOR FLAT SCREEN VM9G5DA S995T 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: Specifications

    1. SPECIFICATIONS 48.3 CM(19") 90degree Deflection, 29mm Neck, 0.26mm Dot Pitch, Non-Glare Screen,anti-reflective,antistate coating Viewable image Size : 45.7CM (18") 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 (Option).
  • Page 4 Factory Preset Timings: 8 User Timings: 20 Misconvergence Center : 0.25mm Max. Corner : 0.35 mm Max. 10. Video Dot Rate: 200 MHz 11. Power Source: Switching Mode Power Supply AC 100 ~240V, 50/60Hz Universal Type 12. Operating Temperature: 0°C to 40°C Ambient 13.

  • Page 5: Precaution And Notices

    2. PRECAUTIONS AND NOTICES 2-1 SAFETY PRECAUTIONS 1. Observe all caution and safety related notes located inside the display cabinet. 2. 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.

  • Page 7: Adjustment

    PIN NO. DESCRIPTION PIN NO. DESCRIPTION GREEN BLUE SYNC. GND HORIZ. SYNC GND-R VERT. SYNC (•VCLK) GND-G GND-B 3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty seconds for display tube warm-up.
  • Page 8 2. Factory preset Timings Adjustment: A. Press shuttle Knob to show OSD window press shuttle Knob again to switch the functional controls. B. Rotate the shuttle Knob to select the "ZOOM" function, then press the shuttle Knob 10 seconds again. While do not release the shuttle Knob until the OSD window changed to the Factory preset window.
  • Page 9 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. 3. White Balance, Luminance adjustment: A. Bias (Low Luminance) adjustment: (a) Set mode 7 1024 x 768 Fh: 60KHz full white pattern.
  • Page 10 5. Purity Adjustment: A. Be sure that the display is not being exposed to any external magnetic fields.. B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is 29mm .(See below diagram) C. Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to obtain a complete field of the color red.

  • Page 11: Circuit Description

    5. CIRCUIT DESCRIPTION 5-1 MICRO CONTROLLER CIRCUIT MICRO Controller The IC101 contains a 6502 8-bit CPU code, 256 bytes of RAM, 16K bytes of ROM, 14 channel 8 bit PWM D/A converters, 2 channel A/D converters for key detection, one 8 bit pre-laudable base timer, internal H-sync and V-sync signals processor providing mode detection, watch- dog timer preventing system from abnormal operation, and an I2C bus interface.

  • Page 12: Deflection Circuit

    5-2 DEFLECTION CIRCUIT Hor. Sync. And Ver. Sync come from PC, then go into the CPU (IC101). The output Sync Flows into Auto sync Deflection Controller IC401 (TDA4856). The IC401 processes Sync Signal and output drive signal to horizontal, vertical and B+ driver circuit.

  • Page 13: Transistor & Diode Circuit

    5-5 TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTIONAL 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 Protection diode for Q403 D406, D407 Supply a bias for D408 D408 Demping diode D421~D423...
  • Page 14 LOCATION FUNCTIONAL DESCRIPTION D921~D923 Rectifier for output Voltage Supply D924 Clip Diode for Trigger CKT D925 Rectifier for B+ Supply D926,D927 Raster Position Control D939 Clip Diode for Snuffer Pulse ZD901,ZD902,ZD903 Protection Diode Q901 MOS FET for Switching Power Control Q904,Q906 Start up CKT for IC901 Q908,Q916...

  • 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: Abnormal Display

    6-2 ABNORMAL DISPLAY NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 12V CHECK THE PIN 2 OF P802 CONNECTOR = 12V CHECK THE OUTPUT VOLTAGE OF IC701 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...

  • Page 17: Hor./Osc/Def/Hv Circuit Fault

    6-4 HOR./OSC/DEF/HV CIRCUIT FAULT NO RASTER (DISCONNECT WITH SIGNAL CABLE) CHECK IC801 PIN 10 ABOUT 11.5V VDC CHECK IC401 PIN10 RELATIVE CIRCUIT CHECK IC401 PIN8 Waveform ABOUT 10Vpp CHECK IC801 PIN 26 ~ 30 RELATIVE CIRCUIT CHECK THE DRAIN VOLTAGE OF Q402ABOUT 40Vpp CHECK Q402, T401 RELATIVE CIRCUIT...

  • Page 18: Abnormal Vertical Scanning

    2. ABNORMAL HORIZONTAL RASTER CENTER CHECK T903, D926, D927, R968，P403 3.ABNPRMAL HORIZONTAL VIDEO CENTER CHECK IC101 PIN9\10,IC401 PIN18\19 4.ABNORMAL HORIZONTAL LINEARITY CHECK L401,Q407,R447,C448 AND IC101 PIN 20, 21, 22, 23. CS SWITCHER IC403, 6-7 ABNORMAL VERTICAL SCANNING READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 7 ABOUT 40V CHECK ZD601,ZD602, &...

  • Page 19: Poor Focus

    6-9 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT,FOCUS LEAD WIRE, CRT SOCKET & CRT 6-10 NO SOUND (OPTION FOR AUDIO MODEL ONLY) ADJUST VOLUME CONTROL CHECK IC501 PIN 14 ABOUT 14V CHECK POWER ENSURE THE SOUND SOURCE SUPPLY CIRCUIT IS POWER ON CHECK IC501 IC501 FAILURE...

  • Page 20: Power Supply Trouble Shooting Chart

    6-12 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60V - 186V (DEPENDING UPON H.SYNC FREQUENCY) (B) CONSTANT OUTPUT : 7V, 20V, 29V, 54V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT CHECK AC LINE...
  • Page 22 PARTS LIST OF CABINET LOCATION PARTS No. SPECIFICATION CM995TYM CHASSIS FOR S995T IIYAMA 503- SCREW RUBBER WASHER 115- F.B.T CLIP 112- WIRE MOUNT 381- RUBBER FOOT 403- STEEL 506- SPRING 33A 3663- SUPPORT 33A 3726- POWER CAP 33A 3727- POWER ROD 33A 3766- POWER LED LENS 33A 4064-...
  • Page 23 PARTS LIST OF CHASSIS LOCATION PARTS No. SPECIFICATION AIM995TYM MAIN BOARD CR995TYM CRT BOARD ASS'Y 421- SCREW 202- STAINLESS STEEL CLIP 127- PC SUPPORT 5640- AL GND LUG 5659- 500 - REAR BRACKET 581- 26 - CHASSIS LABEL 581- 26 - FAIL-SAFE LABEL 500- CABLE TIE...
  • Page 24 LOCATION PARTS No. SPECIFICATION D904 1N5408 D922 3020- RG-4Z-LF-L1 D923 3020- RG-4Z D925 3040- RG-4 DF923 FERRITE BEAD DF925 FERRITE BEAD F901 FUSE CLIP FBTF 100- FERRITE BEAD H802 8013- WIRE H803 8013- WIRE H804 8013- WIRE H805 8013- 91582H GND1 205- 30 -...
  • Page 25 RY401 260- RELAY DC12V RY901 260- RELAY DC12V SG401 16 - SPARK GAP 1KV SW901 267- 12 - PUSH-PUSH SWITCH T401 167- 110 - DRIVER X’FMR T402 79A 785F- PEA760A SAMPO FBT T701 167- 112 - DRIVER X'FMR T901 769- X’FMR 600UH T903 167-...
  • Page 26 PARTS LIST OF MAIN PC BOARD LOCATION PARTS No. SPECIFICATION BRASS 715A 731- MAIN BOARD C101 450- 104 - 0.1uF +80-20% Y5V 50V C102 309- 330 - 33uF +-20% 16V C103 305- 101 - 100uF +-20% 25V C104 442- 471 - 470PF +-5% 50V NPO C105 309-...
  • Page 27 C702 471 - 470PF 50V C704 309- 109 - 1.0UF +-20% 50V C707 176J- 104 - 0.1UF 5% 250V C708 309- 101 - 2.2Uf +-20% 50V C710 305- 478 - 0.47UF +-5% 50V C717 450- 104 - 0.1UF +80-20% 50V Y5V C719 67A 215K- 828 -...
  • Page 28 D926 38T - DIODE FR103 D927 38T - DIODE FR103 D928 11 - DIODE IN4148 D934 11 - DIODE IN4148 D939 11 - DIODE IN4148 FB101 172- 510 - 51 OHM 5% 1/4W FB401 SHIELD BEAD FB702 SHIELD BEAD FB903 SHIELD BEAD FB904 19 -...
  • Page 29 J076 TIN COATED J077 TIN COATED J078 TIN COATED J079 TIN COATED J080 TIN COATED J081 TIN COATED J082 TIN COATED J083 TIN COATED J084 TIN COATED J085 TIN COATED J086 TIN COATED J087 TIN COATED J088 TIN COATED J089 TIN COATED J090 TIN COATED...
  • Page 30 J165 TIN COATED J166 TIN COATED J167 TIN COATED J168 TIN COATED J170 TIN COATED J171 TIN COATED J173 TIN COATED L101 339 - 3.3UH +-10% RF Coated Choke Coil L102 221 - 220UH +-10% Q101 420- TR. 2SC733P/NEC Q102 446- TR.
  • Page 31 R139 602- 103 - 10K OHM +-5% 1/6W R140 602- 103 - 10K OHM +-5% 1/6W R141 602- 103 - 10K OHM +-5% 1/6W R142 TIN COATED R143 602- 103 - 10K OHM +-5% 1/6W R161 172- 474 - 470K OHM +-5% 1/4W R162 172- 181 -...
  • Page 32 R472 172- 154 - 150K OHM +-5% 1/4W R474 602- 222 - 2.2 OHM +-5% 1/6W R475 602- 131 - 130 OHM +-5% 1/6W R477 602- 912 - 9.1K OHM +-5% 1/6W R478 602- 103 - 10K OHM +-5% 1/6W R479 602- 562 -...
  • Page 33 R935 172- 154 - 150K OHM +-5% 1/4W R936 172- 222 - 2.2K OHM +-5% 1/4W R937 172- 151 - 150 OHM +-5% 1/4W R938 172- 220 - 22 OHM +-5% 1/4W R939 172- 223 - 22K OHM +-5% 1/4W R940 171- 183 -...
  • Page 34 PARTS LIST OF CRT AUTO INS. PC BOARD LOCATION SPECIFICATION 715A 669- CRT BOARD C801 309- 100 - 10uF +-20% 50V C802 309- 100 - 10uF +-20% 50V C803 309- 100 - 10uF +-20% 50V C804 305- 101 - 100Uf +-20% 16V C805 450- 104 -...
  • Page 35 D811 11 - DIODE IN4148 D812 11 - DIODE IN4148 D813 11 - DIODE IN414 D814 19 - DIODE 1SS83 D815 19 - DIODE 1SS83 D816 19 - DIODE 1SS83 D817 11 - DIODE IN4148 D818 11 - DIODE IN4148 D819 11 - DIODE IN4148...
  • Page 36 R808 602- 101 - 100 OHM +-5% 1/6W R809 602- 101 - 100 OHM +-5% 1/6W R810 602- 101 - 100 OHM +-5% 1/6W R811 602- 562 - 5.6K OHM +-5% 1/6W R812 602- 152 - 1.5K OHM +-5% 1/6W R813 602- 102 -...
  • Page 37 PARTS LIST OF Q802/803/804 ASS'Y LOCATION PARTS No. SPECIFICATION 3028- MICA 361- HEAT SINK 1730- 10 - SCREW Q802 509- 2SC3953E Q803 509- 2SC3953E Q804 509- 2SC3953E CRT SOCKET ASS'Y LOCATION PARTS No. SPECIFICATION 6010- SOCKET HOLDER 3504- 17” D.F. CRT SOCKET PARTS LIST OF IC601 ASS'Y LOCATION PARTS No.
  • Page 38 Q403 706- 2SC5521Z Q405 415- TR. TIP122 Q911 600- POWER MOSFET IRF634A PARTS LIST OF Q425 ASS'Y LOCATION PARTS No. SPECIFICATION 3028- MICA HEAT SINK 1730- SCREW Q425 728- HSB772P/HSB772Z PARTS LIST OF Q420 ASS'Y LOCATION PARTS No. SPECIFICATION 6003- SCREW NUT 6015- HEAT SINK...

  • Page 41: Ic Block Diagrams

    10. IC BLOCK DIAGRAM IC101 IC403/IC404 UM6861 LM324 V-SYNC I/P OUTPUT OUTPUT 4 INVERTING INVERTING SUSPEND H-SYNC I/P INPUT 1 INPUT 4 NON-INVERTING NON-INVERTING INPUT 1 INPUT 4 RESET_ IC105 NON-INVERTING NON-INVERTING INPUT 2 INPUT 3 74LS14 INVERTING INVERTING INPUT 2 INPUT 3 OSC O/P OUTPUT 2...
  • Page 42 IC801 MM1381 DRIVE R DRIVE ADJ CONTROL R OSD IN G OSD IN CONTRAST DRIVE B OSD IN G DRIVE ADJ ATTENUATOR ATTENUATOR VIDEO/OSD SW B DRIVE ADJ R VIDEO IN CUT-OFF ADJ VCC1 R CLAMP CAP R VIDEO OUT CONTRAST DRIVE VCC2...
  • Page 43 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 46: Schematic Diagram

    W301 H803 SCHEMATIC DIAGRAM C815 CRPC-S769PK IC801 C814 R819 R836 C840 0.01 0.022 MM1382 C828 R302 500V P804 100V R869 CMPC-S995T R.OSD 100V OSD-R R-DRV L801 R807 G.OSD C816 R820 2.2UH R303 0.022 D814 B.OSD OSD-G G-DRV Q817 Q808 1SS83 R304 R808 C817...

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