Tatung VM5ERDA Service Manual
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Tatung VM5ERDA Service Manual

Tatung VM5ERDA Service Manual

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SERVICE MANUAL
COLOR MONITOR
VM5ERDA D556T

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Summary of Contents for Tatung VM5ERDA

  • Page 1 SERVICE MANUAL COLOR MONITOR VM5ERDA D556T...

  • 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 FOR D550T COLOR MONITOR 38cm(15V) 90 Deflection, 29mm Neck, 0.28mm Dot Pitch, Non-Glare Screen Viewable image Size: 35cm (13.8") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, UP/Down key, Function key: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, Pincushion, Trapezoid, Volume (for 5EA/5EnA/5ElrA only) Input Video Signal Mode 1...
  • Page 4 14. Humidity: 10• to 85• Relative, Non-Condensing Weight: 12.5Kgs(Net), 14.5Kgs(Gross) • 16. Dimensions Monitor: Carton: 460(W) X 425(H) X 494(D)mm Monitor: 360(W) X 364(H) X 385(D)mm 17. External Connection: 15 Pin D-type Connector AC Power Cord 18. Speaker: (for 5EA/5EnA/5ElrA only) Rate power: 1W Impedance: 16•...

  • Page 5: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS 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 5E Series 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 D. Full white luminance: (a) Set mode 4 ( 800×600 Fh: 53.7K ) full white pattern. (b) Image size : H:260±4mm, V:195±4mm. (c) Brightness set to raster just cut off and set the contrast to max. (d) Adjust VR701 to make sure white luminance at 100 ± 2cd/m². 4.

  • Page 10: Circuit Description

    5. CIRCUIT DESCRIPTION 5-1 MICRO CIRCUIT IC101 is CPU, This CPU has the following functions. 1. Detect timing mode by sensing the horizontal frequency, vertical frequency, the polarity of Hor. Sync and Ver. Sync. 2. Key board scan control. 3. Geometry and volume (5EA/5EnA/5ElrA only) control internal D/A converters and I²C bus control. 4.
  • Page 11 5-5 TRANSISTOR & DIODE CIRCUIT LOCATION CIRCUIT FUNCTION DESCRIPTION D901 ~ D904 Bridge Rectifier for AC Source D910 Clamp Diode for Snubber CKT D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D925 Rectifier for Output Voltage D930 Rectifier for Output Voltage D927...

  • Page 12: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS 88V, 12V CHECK MAIN PC BOARD CHECK POWER SAVING CIRCUIT, Q909, Q910 CHECK THE HIGE VOLTAGE OF CRT ABOUT 23.5KV ~ 25KV CHECK FAILSAFE CKT Q402, Q403 RELATIVE CKT. CHECK THE VOLTAGE OF CRT HEATER ABOUT 6.3V CHECK CRT'S HEATER RELATIVE CIRCUIT Q907, Q908...
  • Page 13 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 2, 16 ABOUT 8V CHECK 8V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 11 ABOUT 10Vpp CHECK THE RELATIVE CIRCUIT OF CLAMP.

  • Page 14: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC VCC ABOUT 8V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 13, 15, 18 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 75V CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB...

  • Page 15: Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF Q601 & Q707 ON MAIN PCB CHECK C836, R859 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT FBT PIN 5 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1.

  • Page 16: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL SIZE READJUST H-SIZE FUNCTION CHECK THE RELATIVE CIRCUIT OF Q404, Q405, & Q406 CHECK FBT VOLTAGE ABOUT 88V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT 24.5KV 2.

  • Page 17: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 ABOUT 11.8V PIN 6 CHECK D601, C606 RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT READJUST V-SIZE FUNCTION VALUE CHECK IC401 PIN 20, 21, 22, 23 RELATIVE CIRCUIT 2.

  • Page 18: Side-Pin Cushion Distortion

    6-7 SIDE-PIN CUSHION DISTORTION READJUST SIDEPIN FUNCTION VALUE CHECK IC401, Q404, Q405, Q406 RELATIVE CKT. 6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT 6-9 NO SOUND (FOR 5EA/5ElrA ONLY) CHECK IC501 ADJUST VOLUME CONTROL PIN 12 ABOUT 14V CHECK POWER...

  • Page 19: 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 : 88V - 160V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 21: Parts Listing

    PARTS LIST OF CABINET LOCATION D550TACOSPN2 SPECIFICATION (LOW RADIATION 110V) C550S12 CHAS ASS'Y 503- SCREW RUBBER WASHER 403- BUMPER STEEL SPRING 800- 504 - BARCODE 33A 4018- KEY PAD 33A 4019- FUNC LED LENS 33A 4020- S.W.CAP 730- 2Y - BEZEL 153- CRT WARNING LABEL...
  • Page 22 PARTS LIST OF CHAS LOCATION C550S12 SPECIFICATION AI550S MAIN PC BOARD ASS'Y CR550S CRT BOARD ASS'Y 421- SCREW 141- PCB SUPPORT 15A 5640- AL GND LUG 15A 5643- REAR BRACKET 33A 3662- LED HOLDER 581- 26 - LABEL 581- 624 - CHASSIS LABEL 500- CABLE TIE...
  • Page 23 LOCATION C550S12 SPECIFICATION C951 215- 470 - 47uF 200V JAMICON C963 65A 305M- 472 - 4700PF +-20% 400VAC C964 65A 305M- 472 - 4700PF +-20% 400VAC CN902 33A 3074- 2P PLUG F901 FUSE 2.5A 250V F901 FUSE D901 55W - DIODE IN5408 D902 55W -...
  • Page 24 LOCATION C550S12 SPECIFICATION R989 61A 152M- 471 - 470 OHM +-5% 2W RY901 260- RELAY DC12V SW901 77A 411A- PUSH SWITCH T401 167- 71A - DRIVER X'FMR T402 355- T901 80A 356T 15” POWER X'FMR TP902 211- VR701 334- 47K OHM +-25% VR702 75A 334M- 200K OHM VR...
  • Page 25 LOCATION AI550S SPECIFICATION C604 64A 701J- 224 - 0.22uF +-5% 50V C605 309- 470 - 47UF +-20% 50V C607 444- 681 - 680PF 10% Y5P 50V C608 450- 104 - 0.1uF +80-20% 50V C609 450- 104 - 0.1uF +80-20% 50V C610 64A 701J- 474 -...
  • Page 26 LOCATION AI550S SPECIFICATION D701 11 - DIODE IN4148 D702 11 - DIODE IN4148 D704 47P - IN4004 D706 21P - PS156R D710 TIN COATED D721 TIN COATED D910 26T - FR107 D911 31T - S.W DIODE BAV20 D912 31T - S.W DIODE BAV20 D913 11 -...
  • Page 27 LOCATION AI550S SPECIFICATION J047 TIN COATED J048 TIN COATED J049 TIN COATED J051 TIN COATED J052 TIN COATED J053 TIN COATED J054 TIN COATED J055 TIN COATED J056 TIN COATED J058 TIN COATED J059 TIN COATED J060 TIN COATED J061 TIN COATED J062 TIN COATED...
  • Page 28 LOCATION AI550S SPECIFICATION Q940 446- TR. 2SC1213AC R100 602- 472 - 4.7K OHM +-5% 1/6W R101 602- 681 - 680 OHM +-5% 1/6W R102 602- 681 - 680 OHM +-5% 1/6W R103 602- 681 - 680 OHM +-5% 1/6W R104 602- 681 - 680 OHM +-5% 1/6W...
  • Page 29 LOCATION AI550S SPECIFICATION R440 602- 472 - 4.7KOHM +-5% 1/6W R441 61A 175L- 823 - 82K OHM +-5% 1/2W R442 602- 202 - 2K OHM +-5% 1/6W R443 602- 473 - 47K OHM +-5% 1/6W R444 TIN COATED R445 602- 102 - 1K OHM +-5% 1/6W R446...
  • Page 30 LOCATION A550SI SPECIFICATION R953 602- 303 - 30K OHM +-5% 1/6W R956 172- 122 - 1.2K OHM +-5% 1/4W R958 172- 102 - 1K OHM +-5% 1/4W R959 602- 333 - 33K OHM +-5% 1/6W R960 602- 473 - 47K OHM +-5% 1/6W R962 172- 220 -...
  • Page 31 PARTS LIST OF CRT AUTO INS. PC BOARD LOCATION RAI550S SPECIFICATION 715A 719- CRT PC BOARD C801 305- 100 - 10uF +-20% 50V C802 305- 100 - 10uF +-20% 50V C803 305- 100 - 10uF +-20% 50V C804 450- 104 - 0.1uF +80% -20% Y5V 50V C805 450-...
  • Page 32 LOCATION RAI550S SPECIFICATION L805 478 - 0.47UH +-10% L806 478 - 0.47UH +-10% L807 478 - 0.47UH +-10% L808 19 - BEAD L809 109 - 1UH +-5% L810 109 - 1UH +-5% L811 109 - 1UH +-5% R801 602- 750 - 75 OHM +-5% 1/6W R802 602-...
  • Page 33 PARTS LIST OF IC601 ASS'Y LOCATION PARTS No. SPECIFICATION WASHER 372- SILICONE RUBBER 376- HEAT SINK M1A 1730- 10 - SCREW IC601 574- TDA9302H PARTS LIST OF Q403/Q406/D408 ASS'Y LOCATION PARTS No. SPECIFICATION NYLON WASHER 32A 3028- MICA 374- HEAT SINK M1A 1730- 10 - SCREW...
  • Page 34 PARTS LIST OF Q911 ASS'Y LOCATION PARTS No. SPECIFICATION NYLON WASHER 372- SILICONE RUBBER 315- HEAT SINK M1A 1730- SCREW Q911 600- MOS FET IRF634A PARTS LIST OF CAB'T ASS'Y LOCATION PARTS No. SPECIFICATION 385- RUBBER FOOT 506- SPRING 33A 4016- POWER BUTTON 33A 4017- POWER LENS...

  • Page 35: Block Diagram (Deflection)

    IC801 IC802 SIGNAL LM1279AN 25KV CABLE LM2438 O/P PRE.AMP. FOCUS FUNCTION KEY UP/DOWN CONTROL IC101 UM68P61A/ WT62P1 IC401 Q402,T401 Q403,T402(FBT) CPU CRYSTAL TDA9111 8M/12M HOR. DRIVER HOR.O/P VERT.&HOR.OSC Q907,Q908 Q909,Q910 LED CONTROL X-RAY PROTECTION POWER SAVING Q404,Q405,Q406 IC601 PINCUSHION & TDA9302H H-SIZE CONTROL VERT.O/P...

  • Page 37: Ic Block Diagrams

    IC101 UM6861/WT62P1 DEGAUSS V-I/P BRIGHT H-I/P CONTRAST RESET_ IC802 OSC0 OFF MODE LM2438 OSC1 H-OUT Vin 1 V-OUT Vin 2 Vin 3 Vout 3 WRITE PROTECT MUTE Vout 2 STAND BY/SUSPEND Vout 1 H.W DDC SENSE AUDIO KEY SELECT LED DETECT LED9 LED8 LED7...
  • Page 38 IC102 24C04 HV GENERATOR MEMORY EEPROM ARRAY CONTROL CONTROL (128X8) LOGIC LOGIC XDEC PAGE LATCHES YDEC SENSE AMP R.W CONTROL IC601 TDA9302H FLYBACK GENERATOR POWER AMPLITIER THERMAL PROTECTION IC901 3842 SET/ Vref Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S.

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