1. Manuals
  2. Brands
  3. ViewSonic Manuals
  4. Monitor
  5. P774B-2NT Series
  6. Service manual

ViewSonic P774B-2NT Series Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
COLOR MONITOR
P774B-2NT Series
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND
DISCLAIMS LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
MANUFACTURE DATE: MAR.2005

Advertisement

Table of Contents
loading

Related Manuals for ViewSonic P774B-2NT Series

Summary of Contents for ViewSonic P774B-2NT Series

  • Page 1 SERVICE MANUAL COLOR MONITOR P774B-2NT Series THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE SPECIFICATIONS ..................… PRECAUTION AND NOTICES ..............SAFETY PRECAUTIONS ..............PRODUCT SAFETY NOTICE ............. SERVICE NOTES ................HIGH VOLTAGE WARNING ............... OPERATING INSTRUCTIONS ..............ADJUSTMENT ...................… ADJUSTMENT CONDITIONS AND PRECAUTIONS ......MAIN ADJUSTMENTS ................ ADJUSTMENT METHOD ..............EDID CONTENTS................

  • Page 3: Specifications

    1. SPECIFICATIONS FOR E70f SERIES COLOR MONITOR CRT : 43.2 cm (17”) F&S high contrast CRT, 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, Degauss, H-Size, H-Center, V- Center, V-Size, ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Color Temperature, Moire Reduce, Recall, Language select, OSD EXIT,User s Color,pincushion.
  • Page 4 14. Weight: 17. Kgs(Net), 20.5Kgs(Gross) 15. Package Specifications Width: 540 mm Height: 537 mm Depth: 570mm 16. External Connection: 15 Pin D-sub Connector AC Power Cord 17. Regulatiory/Safety - EN 60950 + EKI-ITB 2000: GS-mark - UL60950 - CSA 22.2 No.60950 - VDE 0860 (implosion protection) - CE-mark - CB-certificate and test report according to IEC60950...

  • 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: Service Notes

    SERVICE NOTES When replacing parts or circuit boards, clamp the lead wires around terminals before soldering. When replacing a high wattage resistor (more than 1/2W of metal oxide film resistor) in circuit board, keep the resistor about 10mm (1/2 in) away from circuit board. Keep wires away from high voltage or high temperature components.

  • Page 7: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 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 4.1.1. Approximately 30 minutes should be allowed for warm up before proceeding. 4.1.2. 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...
  • Page 9 CONTRAST H-MOIRE REDUCE BRIGHTNESS V-MOIRE REDUCE H-CENTER R-GAIN H-SIZE G-GAIN V-CENTER B-GAIN V-SIZE R-BIAS BURN IN TIME G-BIAS PINCUSHION R-BIAS TRAPEZOID DEGAUSS PIN-BALANCE OSD EXIT PARALLELOGRAM OSD H-SIZE ROTATION video ic dc off set Top corner V-LINEARITY Bottom corner Frequency select 9300 COLOR TEMPERATURE Select four key or five key 6500 COLOR TEMPERATURE...
  • Page 10 D. To switches the input signal to the other Timing Mode. Please follow step C ~ D to get the optimum picture. E. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will be returned to the original OSD window.(user's operating condition) F.

  • Page 11: Edid Contents

    RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets 6-pole Convergence Magnets 4-pole Convergence Magnets Deflection Yoke 4.3.6 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: Circuit Description

    5. CIRCUIT DESCRIPTION 5-1 MICRO CONTROLLER CIRCUIT MICRO Controller The IC101 contains a 8031 8-bit CPU core, 60K bytes of RAM, 16K bytes of ROM,14 channel 8 bit PWM D/A converters, 2 channel A/D converters for key detection,0.5sec watch-dog 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 13: Transistor & Diode Circuit

    The X-ray protection input pin25 provides a voltage detector with a precise threshold. If the voltage exceeds this threshold for a certain time, an internal latch switches the whole IC into protection mode. In this mode several pins are forced into defined states: Vertical Oscillator The vertical free –running frequency is determined by the resistor C610 at pin19.

  • Page 14: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 55.5V, 12.3V, 6.3V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL Q909, Q910 CHECK THE HIGE VOLTAGE OF CRT REFER ITEM S.M.P.S. ABOUT 24.5 ~ 25.5KV CHECK FAILSAFE PIN 25 RELATIVE CKT.
  • Page 15 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 10, 18 ABOUT 5V CHECK 5V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 23 CLAMP PULSE CHECK THE IC801 PIN RELATIVE CIRCUIT CHECK THE VIDEO OUTPUT OF IC801 PIN 19, 20, 21 ABOUT 4Vpp, CONTRAST...

  • Page 16: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 5V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 19, 20, 21 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 PIN 10/PIN 18 Vcc CIRCUIT CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V CHECK THE 80V RELATIVE CIRCUIT...

  • Page 17: No Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF Q705 CHECK R846 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT FBT PIN 5 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1. NO RASTER (DISCONNECT WITH SIGNAL CABLE) CHECK IC401 PIN 29 ABOUT 12 VDC CHECK IC401 PIN 29 RELATIVE CIRCUIT CHECK IC401 PIN 26 WAVE FORM...

  • Page 18: 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 62V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT 24.5KV 2.

  • Page 19: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 2 ABOUT 11.8V PIN 4 ABOUT -12V CHECK D601, C605 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 20: Power Supply Trouble Shooting Chart

    6-9 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 58V - 145V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 14V, -12V, 78V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT THE VARIABLE...

  • Page 21: Mechanical Of Cabinet Front Dis-Assembly

    MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...

  • Page 22: Bom List

    8. BOM LIST NUMBER UNIT LOCATION PARTS No. SPECIFICATION CKB774B2NT KEPC BOARD CMB774B2NT CHASSIS FOR B774B-2NT 1A 503503 47 SCREW FOR CRT 5A600604075S CRT WASHER 5A600605075S CRT WASHER 11A 112500 WIRE MOUNT 11A 115500 FBT CLIP 19A 403 7 STEEL 33A6166 MN A KEY PAD LEFT 33A6167 MN A...
  • Page 23 Q1A 340 16128 SCREW 750A1697504 JA 0.35*90Ts Deg.coil W33A4461 Y 1A RAIL W33A4461 Y 2A RAIL W33A6171AMN A BIG PLATE BEZEL CKB774B2NTAI KEPC AI H105 95C8013 5614 WIRE HARNESS LED1 81A 10 4 BH BL-BYG274-DP-1.6%-LC4-A SW101 77A 600 1GCJ TACT SWITCH TSPB-2 SW102 77A 600 1GCJ TACT SWITCH TSPB-2...
  • Page 24 C422 64A100J225 59 2.2UF +-5% 100V C425 63A210J2443CC 0.24uF 400V C426 63A210J6842CC 0.68UF 250V +-5% MPP C428 63A210J2442CC 0.24uF 250V C432 67A 21547011J 47UF +-20% 200V JAMICON C482 67A 21547011J 47UF +-20% 200V JAMICON C488 65A 2K470 6A6921 47PF 2KV C489 65A 2K470 6A6921 47PF 2KV...
  • Page 25 L901 73A 174 7 S3 LINE FILTER L903 73C 174502 6010 COIL L906 73A 253 88 HB CHOCK P106 33A3278 5D PLUG P402 33A3192 4 4P PLUG P803 33A3278 5D PLUG PR901 61A 52 27 4T PTCR 9OHM+-20% 220V THI Q907 57C2015 1A 2SB772-P...
  • Page 26 C111 65A 450104 7T 0.1UF +80-20% 50V Y5V C112 65A 450104 7T 0.1UF +80-20% 50V Y5V C113 67A 309101 3T 100UF +-20% 16V C116 65A 444101 5T 100 PF 10% 50V Y5P C117 65A 444101 5T 100 PF 10% 50V Y5P C118 65A 450104 7T 0.1UF +80-20% 50V Y5V...
  • Page 27 C608 64A178J474 1T C121X 0.47UF 100V +-5% C609 67A 309470 7T 47UF +-20% 50V C610 64A178J104 0T CL21X0.1UF 63V +-5% C611 64A178J474 0T CL21X. 0.47UF 63V +-5% C613 64A701J1540AT 0.15UF 50V +-5% C614 65A 444101 5T 100 PF 10% 50V Y5P C703 64A178J472 1T 4700PF 100V...
  • Page 28 D450 93A 64 1152T DIODE 1N4148 D463 93A 6026T52T RECTIFIER DIODE FR107 D470 93A 6026T52T RECTIFIER DIODE FR107 D471 93A 5247T52T 1N4004 D601 93A 5247T52T 1N4004 D602 93A 64 1152T DIODE 1N4148 D603 93A 64 1152T DIODE 1N4148 D701 93A 60210 1N5819 D706 93A 6044T52T...
  • Page 29 Q920 57C 420502 T 2SA733P R100 61A 60210352T CFR 10K OHM+-5% 1/6W R101 61A 60210252T CFR 1K OHM+-5% 1/6W R102 61A 60262152T CFR 620 OHM+-5% 1/6W R103 61A 60210152T CFR 100 OHM+-5% 1/6W R104 61A 60247252T CFR 4.7K OHM+-5% 1/6W R105 61A 60210152T CFR 100 OHM+-5% 1/6W...
  • Page 30 R415 61A 17247352T CFR 47K OHM +-5% 1/4W R416 61A 17247252T CFR 4.7K OHM +-5% 1/4W R418 61A 17212252T CFR 1.2K OHM +-5% 1/4W R421 61A 17210052T CFR 10OHM+-5% 1/4W R422 61A 60210152T CFR 100 OHM+-5% 1/6W R424 61A 17210052T CFR 10OHM+-5% 1/4W R425 61A 17210152T...
  • Page 31 R613 61A 17210252T CFR 1KOHM +-5% 1/4W R615 61A 17212452T CFR 120K OHM +-5% 1/4W R617 61A 60291352T CFR 91K OHM +-5% 1/6W R621 61A 17213452T CFR 130K OHM +-5% 1/4W R703 61A 17215152T CFR 150 OHM +-5% 1/4W R713 61A 60256252T CFR 5.6KOHM+-5% 1/6W R715...
  • Page 32 R980 61A 17222152T CFR 220OHM+-5% 1/4W R981 61A175L10152T CFR 100 OHM +-5% 1/2W R982 61A 60210352T CFR 10K OHM+-5% 1/6W R983 61A 60210352T CFR 10K OHM+-5% 1/6W R994 61A 17220352T CFR 20KOHM+-5% 1/4W 6A 31500 EYELET RV10 6A 31 4 BRASS RV11 6A 31 4...
  • Page 33 ZD903 93A 3953252T TZX24B TFK ARB774B2NT CRT BOARD B774B-2NT 40A 45762412B LABEL 87A3504 DL CRT SOCKET 90C6113 4 HEAT SINK 705A774BR5601A IC802 ASS'Y B774B-2NT C805 67A 305470 9 47UF +-20% 100V C806 65A 2M1033FB6921 10000PF -20%~+18% 2KV C811 67A 305470 9 47UF +-20% 100V FB801 53A 40 8...
  • Page 34 C837 65A 44447113T 470PF +-10% Z5P 50V C839 65A 44210013T 10PF +-5% NPO 50V D802 93A 6450152T SWITCHING DIODE BAV21 D803 93A 64 1152T DIODE 1N4148 D804 93A 6450152T SWITCHING DIODE BAV21 D805 93A 64 1152T DIODE 1N4148 D806 93A 6450152T SWITCHING DIODE BAV21 D807 93A 6450152T...
  • Page 35 R832 61A 60210052T CFR 10 OHM +-5% 1/6W R833 61A175L51952T MOFR 5.1 OHM+-5% 1/2W R834 61A 60275052T CFR 75 OHM+-5% 1/6W R835 61A 60210052T CFR 10 OHM +-5% 1/6W R836 61A 60233052T CFR 33 OHM +-5% 1/6W R837 61A 17233452T CFR 330K OHM +-5% 1/4W R840 61A 17233052T...
  • Page 36 32A3028 8 MICA 90A6209 1 HEAT SINK M1A1730 8128 SCREW M3x8 Q911 57A 600512 STP8NS25 9A 203 8 BRASS PIN NR901 61A 58 8T L NTCR 15OHM+-15%2.5A THI 84A 33 10 FUSE CLIP F901 84A 7H400 SL FUSE 4A 250V LF-618 004 87A 501 6 6425 RECEPTACLES...

  • Page 37: Block Diagram

    BLOCK DIAGRAM IC801 IC802 SIGNAL NT6812 LM2476 O/P CABLE PRE.AMP. 24.5KV FUNCTION FOCUS CONTROL IC101 NT68F65 IC401 Q402,T401 Q403,T402(FBT) TDA9118 CRYSTAL 12M HOR. DRIVER HOR.O/P VERT.&HOR.OSC Q907,Q908 Q909,Q910 X-RAY PROTECTION POWER SAVING Q404,Q405,Q406 IC601 PINCUSHION & TDA9302H H-SIZE CONTROL VERT.O/P Q705 BLANKING CIRCUIT...
  • Page 38 BLOCK DIAGRAM (SMPS) 12.3V Q909 DEGAUSSING RECTIFIED OUTPUTS Q910 C.K.T RECTIFIED & T901 6.3V & 6.3V Q907 SMOOTHED POWER Q908 Transformer SMOOTHED Q913 Q904 RY901 START RECTIFIED C.K.T & L906 R939 D912 CHOCK FROM SMOOTHED COIL IC101 CPU POWER OUTPUTS Q911 ON/OFF RECTIFIED...

  • Page 39: Ic Block Diagrams

    IC BLOCK DIAGRAM IC101 NT6865 IC401 STV9118...
  • Page 40 IC102 24LC08...
  • Page 41 IC601 STV9302A IC801 NT6812K...
  • Page 42 IC802 LM2476 IC901 STR-G5643D...

  • Page 43: Pcb Layout

    11 PCB LAYOUT 11-1 MAIN PCB LAYOUT...
  • Page 44 11-2 CRT BOARD LAYOUT...

  • Page 45: Schematic Diagram

    P774B3-2 MAINBOARD:715A1316-*-S1 H803 CRPC-P774 D101 DSCL ZD103 C130 ZD104 C131 6.2V ZD102 6.2V 1000PF 0.1UF 250V DSDA 6.2V 33PF FB802 D803 C802 ZD101 P801 22PF 1N4148 R805 0.1UF C860 C829 6.2V 47UF/100V Sense C817 R802 D804 C813 12PF 1N4148 10PF IC801 56A366-509 HOUT D801...

Table of Contents