ViewSonic Q51 series Service Manual
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ViewSonic Q51 series Service Manual

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SERVICE MANUAL

COLOR MONITOR

(Q51/E50C 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: DEC.2004
1

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  • Page 1: Service Manual

    SERVICE MANUAL COLOR MONITOR (Q51/E50C 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: DEC.2004...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CONTENTS PAGE SPECIFICATIONS ....................…..PRECAUTION AND NOTICES ..........…..........2-1 SAFETY PRECAUTIONS ..............…....2-2 PRODUCT SAFETY NOTICE .............……......2-3 SERVICE NOTES ................……....2-4 HIGH VOLTAGE WARNING ............……………....OPERATING INSTRUCTIONS ..............…………….... ADJUSTMENT ..................……………....4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ....…………………..4-2 MAIN ADJUSTMENTS ............……………....

  • Page 3: Specifications

    1. SPECIFICATIONS FOR Q51/E50C SERIES COLOR MONITOR CRT: Type 15" (13.8” viewable diagonal area) CPT M36AES83X01 (L), LPD M36EDR320X304/6F01L;Dot Pitch 0.28 mm, Shadow Mask, None Glare. Viewable image Size: 35CM (13.8”) diagonal Display Color: Unlimited Colors External Controls: Power On/Off, OSD key, Function knob: Contrast, Brightness, and Degauss. Horizontal Size, Horizontal Position, Vertical Size, Vertical Position, Pincushion, Pincushion Balance, Trapezoid, Parallelogram, Tilt, Horizontal Moire, Vertical Moire, ViewMatch color, ViewMeter, OSD Position, Languages, Memory Recall, Zoom.
  • Page 4 Mis-convergence: A Zone 0.25 mm B Zone 0.30 mm C Zone 0.35mm Power Source: Switching Mode Power Supply AC 90-264 VAC 50/60 Hz ENVIRONMENTAL Operating Temperature 0°C to +40°C Storage Temperature -40°C to +60°C Operating Relative Humidity 5% to 95% Non-Condensing Storage Relative Humidity 5% to 95% Non-Condensing Operating Altitude...

  • 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: Service Notes

    2.3 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 Q51/E50C 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 B. Gain (window white luminance) adjustment: (a) Set mode 5 800×600 Fh: 53KHz window white pattern (100mm*100mm window). (b) Brightness set to raster just cutoff and set the contrast to max. Adjust G-Gain , B-Gain , R-Gain , to make color temperaturem Y=140±2 cd/m². x=283 ± 5, y=297 ±...
  • Page 10 RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets 6-pole Convergence Magnets 4-pole Convergence Magnets Deflection Yoke 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 11 User MENU 1 User MENU 2 Contrast adjusts the difference between the image background (black level) and the foreground (white level) Brightness adjusts the background black level of the screen image. Zoom expands and contracts the entire screen image. Horizontal Position moves the screen image left or right. Horizontal Size adjusts width of the screen image.
  • Page 12 Pincushion curves the vertical sides of the screen image. Pin Balance curves the vertical edges of the screen image to the left or right. Trapezoid adjusts the top and bottom of the screen image until they have equal length. Parallel slants the vertical edges of the screen image until they are parallel. Tilt rotates the entire screen image.

  • Page 13: Edid Contents

    4.4 EDID CONTENTS 0 1 2 3 4 5 6 7 8 9 ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63 10 | 1B 85 01 01 01 01 01 0E 01 03 20 | 1D 1C 15 B0 2A E0 58 9F 54 46 30 | 9B 24 10 48 4C FF F8 00 45 59 40 | 31 59 01 01 01 01 01 01 01 01 50 | 01 01 01 01 F9 15 20 F8 30 58...
  • Page 14 Pin2, V ref Bypass, provides filtering for the internal voltage. Pin3, Vref, sets the internal bias current level for optimum performance. 5.2 DEFLECTION CIRCUIT The deflection circuit is achieved by a high performance and efficient solution IC 401 (TDA4841) for this monitor. All functions are controllable by IIC –bus.
  • Page 15 5.3 TRANSISTOR & DIODE CIRCUIT LOCATION CIRCUIT FUNCTION DESCRIPTION D901 ~ D904 BRIDGE RECTIFIER FOR AC SOURCE D918, D919 RECTIFIER FOR OUTPUT VOLTAGE D921 RECTIFIER FOR OUTPUT VOLTAGE D922 RECTIFIER FOR OUTPUT VOLTAGE D923 RECTIFIER FOR OUTPUT VOLTAGE D925 RECTIFIER FOR B+ OUTPUT VOLTAGE D929 B+ FEED BACK RECTIFIER FROM F.B.T PULSE Q907, Q908...

  • Page 16: Trouble Shooting Chart

    6. TROUBLE SHOOTING CHART 6.1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 76V,14.2V CHECK LOWER POWER CIRCUIT H-SYNC,V-SYNC SIGNAL Q909,Q910 CHECK THE HIGE VOLTAGE REFER ITEM S.M.P.S OF CRT ABOUT 24.5~25.5V CHECK FAILSAFE CKT IC401 PIN2 RELATIVE CKT.
  • Page 17 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN10/18 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 PIN23 CLAMP PULSE CHECK THE IC801 PIN23 RELATIVE CIRCUIT CHECK THE VIDEO OUTPUT OF IC801 PIN19/20/21 ABOUT 3Vpp...

  • Page 18: Abnormal Display

    6.2 ABNORMAL DISPLAY NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT CHECK THE 5V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN19/20/21 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 PIN23 CIRCUIT CHECK THE VIDEO 80V OF IC802 PIN4 ABOUT 77V CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB...

  • Page 19: No Blanking

    6.3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF R660/C662/D620 AND Q705/IC601 CHECK R879 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT ON MAIN PCB 6.4 HOR./OSC/DEF/HV CIRCUIT FAULT NO RASTER (DISCONNECT WITH SIGNAL CABLE) CHECK IC401 PIN10 ABOUT 12V CHECK IC401 PIN10 RELATIVE CIRCUIT CHECK IC401 PIN8 WAVE FOR...

  • Page 20: 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 THE FBT B+ VOLTAGE ABOUT 85V AT FH=31KHZ CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT 23.5KV 2.

  • Page 21: Abnormal Vertical Scanning

    6. 6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK IC601 PIN1 ABOUT 12V PIN4 ABOUT –12V CHECK D601, C620 RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT CHECK IC401 PIN21- READJUST V-SIZE FUNCTION 24,PIN12/13 RELATIVE VALUE...

  • Page 22: 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: 80V - 160V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT: 6.3V, 14.2V, -12V, 60V AND 77V BEAD SET ABNORMAL VARIABLE OUTPUT CHECK AC LINE MAKE SURE THAT THE...

  • Page 23: Mechanical Of Cabinet Front Dis-Assembly

    7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...
  • Page 24 S554BVRCV1N1 Item Description Part Number Q’ty Item Description Part Number Q’ty Power Button 33A4136 F0 A SIGNAL CABLE ASS’Y 89C71D 5DH HB1 Key Pad 33A4138 F0 A AC INLET 95A 800 2 2 Front Panel 34A 810AF0 A HEAT SINK 90A 339504 P Screw M5X25 1A 503501 47...
  • Page 25 S554BVCOV1N1 Item Description Part Number Q’ty Item Description Part Number Q’ty Power Button 33A4136 F0 A SIGNAL CABLE ASS’Y 89C71D 5DH HB1 Key Pad 33A4138 F0 A AC INLET 95A 800 2 2 Front Panel 34A 810AF0 A HEAT SINK 90A 339504 P Screw M5X25 1A 503501 47...

  • Page 26: Bom List

    8. BOM LIST Location Remark Part Number Description Quantity Unit S554BVRCV1N1/ CMS554B1VN CHASSIS FOR S554B-1VSC S554BVCOV1N1 S554BVRCVNN1/ CMS554B1VW CHASSIS FOR S554B-1VSC S554BVCOV2N1 1A 503501 47 CRT SCREW 5A 38 8 RUBBER WASHER 11A 112500 WIRE MOUNT 11A 115500 FBT CLIP 19A 403 5 BUMPER STEEL SPRING 23A3182 1...
  • Page 27 44A6568 2 S554BVRCV1N1/ 44C6568709 1B CARTON S554BVRCVNN1 S554BVCOV1N1/ 44A6568709 2A CARTON S554BVCOV2N1 45A 76 28 V3 PE BAG FOR MANUAL 45A 88 1 RN PE BAG FOR MONITOR 50A 502 2 PLASTIC TIE 50A 502 5 CABLE TIE 51A 6 4 SILICON 52A 1150 C TAPE...
  • Page 28 705A554VC93 02 D919 ASS'Y 705A563VC87 04 AC SOCKET ASS'Y C418 63A210J4328CC 4.3nF/2KV +-5% C419 63A210J4728CC 4.7nF/2KV +-5% C422 64A100J105 59 1uF 100V +-5% C425 63A210J3343CU .33UF 5% 400V FOR CAMEL C427 63A210J4342CU 0.43UF 250V C710 63A212J2242AT 220NF 250V +-5% C713 67A 309220 11 22UF +-20% 200V C901...
  • Page 29 LED1 81A 10 2C GP GP3205OCE MTG SIG 15A5640 1 A B AL GND LUG MTG SIG D1A1140 7128 SCREW 4X7(FOR AC) MTG T40 71A 100 8 FERRITE CORE 12*25*15 NR901 61A 58 8 NTCR15OHM +-20% 2.5A UP P402 33A3192 4 4P PLUG P404 33A3278 2...
  • Page 30 C101 65A 442470 9T 47pF/50V SL C102 67A 309470 7T 47UF +-20% 50V C103 65A 450104 7T 0.1UF +80-20% 50V Y5V C105 65A 450104 7T 0.1UF +80-20% 50V Y5V C106 67A 309330 7T 33UF +-20% 50V C107 65A 44222013T 22PF +-5% NPO 50V C108 65A 44222013T 22PF +-5% NPO 50V...
  • Page 31 C621 67A 309471 3T 470UF +-20% 16V C626 64A700J4720AT 4.7NF 100V +-5% C660 67A 305471 3T6371 470UF +-20% 16V C661 65A 450104 7T 0.1UF +80-20% 50V Y5V C662 64A178J822 1T CL21X 8200PF 100V +-5% C701 65A 4501047TV 0.1UF +80-20% 50V Y5V C712 67A 60229 7T 2.2UF +-20% 50V...
  • Page 32 D450 93A 64 1152T DIODE 1N4148 D460 93A 64 1152T DIODE 1N4148 D601 93A 5247P52T 1N4004 D603 93A 64 1152T DIODE 1N4148 D620 93A 64 1152T DIODE 1N4148 D703 93A 64 1152T DIODE 1N4148 D706 93A106050652T SBYV26C D910 93A 6026W52T FR107 D911 93A106050652T...
  • Page 33 Q908 57A 419 SG T KSC945C-G TA FAIRCHILD Q910 57A 419 PP T 2PC945P Q912 57A 446 1 T TRAN.2SC1213AC/HITACHI Q913 57A 419 PP T 2PC945P Q915 57A 446 1 T TRAN.2SC1213AC/HITACHI Q920 57C 619 1A T 2SA673AC Q921 57A 446 1 T TRAN.2SC1213AC/HITACHI Q990 57A 419 PP T...
  • Page 34 R402 61A 60210252T CFR 1K OHM+-5% 1/6W R403 61A 60210152T CFR 100 OHM+-5% 1/6W R404 61A 60210152T CFR 100 OHM+-5% 1/6W R405 61A 60210152T CFR 100 OHM+-5% 1/6W R406 61A 60210152T CFR 100 OHM+-5% 1/6W R409 61A 20010052T MFR 10OHM+-1% 1/4W R412 61A 21068152T MFR 680OHM +-1% 1/6W...
  • Page 35 R631 61A 60222252T CFR 2.2K OHM +-5% 1/6W R660 61A 17220452T CFR 200KOHM+-5% 1/4W R662 61A 21010252T MFR 1K OHM +- 1% 1/6W R701 61A 60262352T CFR 62KOHM+-5% 1/6W R702 61A 60247252T CFR 4.7K OHM+-5% 1/6W R703 61A 60210152T CFR 100 OHM+-5% 1/6W R704 61A 60210052T CFR 10 OHM +-5% 1/6W...
  • Page 36 R963 61A 60222152T CFR 220 OHM +-5% 1/6W R966 61A 60227352T CFR 27K OHM+-5% 1/6W R967 61A 17210452T CFR100K OHM +-5% 1/4W R968 61A 60268252T CFR 6.8K OHM+-5% 1/6W R969 61A214Y68352T MGFR 68K OHM +-5% 1/4W R971 61A 17210552T CFR 1MOHM +-5% 1/4W R972 61A 17251252T CFR 5.1K OHM +-5% 1/4W...
  • Page 37 R807 61A 60210252T CFR 1K OHM+-5% 1/6W R835 61A153M109 59 MOFR 1 OHM +-5% 3W R879 61A152M101 64 MOFR 100OHM+-5% 2W RF879 71A 55 2 A FERRITE BEAD 6.5*5*1.7 C801 67A 305109 7T 1UF +-20% 50V C802 67A 305109 7T 1UF +-20% 50V C803 67A 305109 7T...
  • Page 38 D805 93A 64 1152T DIODE 1N4148 D806 93A 64 1152T DIODE 1N4148 D817 93A 52 9T52T 2A 600V 2A05 D820 93A 39 7352T HZ6B1/HITACHI D821 93A 39 7352T HZ6B1/HITACHI D850 93A 6450752T BAV21 D851 93A 6450752T BAV21 D852 93A 6450752T BAV21 D853 93A 6450752T...
  • Page 39 R854 61A 17212152T CFR 120 OHM +-5% 1/4W R855 61A 17212152T CFR 120 OHM +-5% 1/4W R856 61A 17218152T CFR 180 OHM +-5% 1/4W R857 61A 17222452T CFR 220KOHM+-5% 1/4W R858 61A 17222452T CFR 220KOHM+-5% 1/4W R859 61A 17222452T CFR 220KOHM+-5% 1/4W R860 61A 17210252T CFR 1KOHM +-5% 1/4W...
  • Page 40 D408 93A 220 12 FMP-2FUR 1500/600V 5A S 95A205T 3005A WIRE Q403 57A 724 5 2SC5386/TOSHIBA Q406 57A 415 1 A TR.NPN TIP122/FAIRCHILD Q410 57A 600 28 IRF630B R426 61A153M470 59 MOFR 47 OHM+-5% 3W J133 95A 90 23 TIN COATED X101 93A 22 43 PT 12MHZ...

  • Page 41: Block Diagram

    9. BLOCK DIAGRAM 9.1 BLOCK DIAGRAM OF MONITOR IC 802 IC 801 SIGNAL 25KV LM1246 CABLE LM2469 O/P PRE.AMP. Function KEY IC 803 Menu/Exit LM2480 /Up/Down Control IC 401 IC 101 Q460,T401 Q403,T4029 H-DY NT68F65 TDA4841 Hor.Driver HOR.O/P Vert.&Hor.OSC Q907,Q908 X-Ray Q909,Q910 Protection...

  • Page 42: Ic Block Diagrams

    9.2 IC BLOCK DIAGRAM V-I/P SHU A H-I/P SHU B RESET OSCO OSCL H-OUT IC101 ISCL V-OUT NT68F65 ISDA SENSE SENSE2 H-SIZE PW 1+PW2 DSDA DSDA MUTE G1 MUTE B+...
  • Page 43 IC102 AT24C08A 56A1133-513 W /P IC102 24C08 ISCL ISDA N VF +I/P IC601 TDA4863 -I/P V +O/P...
  • Page 44 IC401 TDA4841 H.UNLUCK CLBI RSCOR VOI+ VS MAD VOR- V ABC V REF IC401 V CAP XSEL TDA4841 HDRV PLL1 H BUF BDRV H REF H CAP BSENS PLL2 HS MAD XRAY FOCUS HFLB...
  • Page 45 IC901 3842 SET/ Vref 8 Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S. COMP COMP. LATCH OSCILLATOR Ct/Rt IC901 56A379-12 Comp Vref F.B. Ct/Rt GND IC901 UC3842...
  • Page 46 IC801 LM1246DKA VFLY H-FLY Vref CLAMP Vref R/V OUT R/V IN G/V OUT G/V IN B/V OUT IC801 B/V IN LM1246 A-GND D-GND DEC 1 OUT DEC 2 OUT DEC 3 OUT...
  • Page 47 IC801 LM1246...
  • Page 48 IC802 LM2469 56A551-8 R O/P G O/P B O/P IC802 LM2469 IC803 LM2480NA 56A539-6 IC803 LM2480NA...

  • Page 49: Pcb Layout

    10 PCB LAYOUT 10-1 MAIN PCB LAYOUT...
  • Page 50 10-2 CRT BOARD LAYOUT...

  • Page 51: Schamatic

    11. SCHAMATIC 715A928-* P601 4 3 2 1 H802 HSYNC C163 VSYNC 150PF C160 R160 150PF C910 100uF R179 C103 R405 R406 C102 R132 ZD105 0.1uF 47uF JUMP SENCE R172 HZ5C2 R115 JUMPER ISCL C162 D130 IC101 47PF R414 C446 C614 R116 ISDA...
  • Page 52 L903 D704 200UH JUMP 73A259-501-T FB906 D912 71A55-19-T R733 D918 JUMP C907 T901 SBYV26C ZD404 150uF/450V R927 C929 80A563-1-N 93A1060-506-52T 67A30-151-15X JUMP 74.5V R917 0.01uF 500V C950 33K 3W JUMP C915 TP902 C960 J185 220PF/1KV R928 4700PF BEAD L906 0.01/2KV 75K 1/2W SW901B 250VAC...
  • Page 53 R820 IC801 715A816-* LM1246DKA R830 C816 1500PF 56A366-509 R857 C815 D856 220k 1/4W BEAD BAV21 D850 VFLY H-FLY 0.2V BAV21 C808 R821 C818 C856 C836 56PF C876 0.1uF 0.1uF/100V 750A5913-1AV(CPT) IC802 0.01UF Vref CLAMP C853 1.5V 1.3V 1000P/500V C852 C851 LM2469 1uF/100V 0.1uF...
  • Page 54 R636 D601 10 3W 1N4004 R068 R660 D620 JUMPER C620 C621 1N4148 200K 1/4W 47uF 470UF 16V D603 R631 C662 1N4148 IC601 TDA4863A 8200PF 100V 56A584-1A R620 C626 C603 0.01uF 100V 4700PF/100V VOUT1 N VF +I/P 0.6V -9.22V R621 C601 -I/P V +O/P C625...

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E50c series

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