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AOC S992 Series Service Manual

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SERVICE MANUAL

COLOR MONITOR

S992 Series
P/N : S992X-3-01-A
Date : Jul-29-02
Version : A00

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Summary of Contents for AOC S992 Series

  • Page 1: Service Manual

    SERVICE MANUAL COLOR MONITOR S992 Series P/N : S992X-3-01-A Date : Jul-29-02 Version : A00...
  • Page 2 1. SPECIFICATIONS FOR 9Glr SERIES COLOR MONITOR CRT : 46CM(19") 90 Deflection, 29mm Neck, flat 0.26mm Dot Pitch, Non-Glare Screen 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.

  • Page 3: Precautions 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 4: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 9G 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 5: Adjustment Conditions And Precautions

    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 6: Factory Preset

    FACTORY PRESET H: 68.8KHz V: 85Hz H: 36.51kHz V: 51.34Hz TC TC TC TC BC BC BC BC 6500 9300 BI BI BI BI 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 COMER R-BIAS TC TC TC TC...
  • Page 7 3. White Balance, Luminance adjustment: A. Bias (Low Luminance) adjustment: (a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern. (b) To make the adjustment condition is under the Factory preset window. Same as step 2-C. (c) Warm up more than 30 minutes. (d) Brightness set to maximum.

  • Page 8: Micro Controller Circuit

    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 9: Deflection Circuit

    On Screen Display Controller The IC804 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. Pin 2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R830, C811, R833) and filter (R126, C115) is used to regulate the appropriate bias current for internal oscillator the resonate at specific dot frequency.

  • Page 10: Transistor & Diode Circuit

    TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTION AL DESCRIPTION D101 For C102 Discharge D405 Speed up for Q403 D406 Supply a bias for D408 D408 Damping Diode and Modulation Diode D414~ D416,D418 Buffer Diode for Q412, Q417, Q418, Q420 Q401 B+ Mute Control Q402 Horizontal Driver Q403...

  • Page 11: Troubleshooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY CHECK MAIN PCB POWER SUPPLY 61.8V,14.5V,80V 60.5V, 14.5V, 80V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL CHECK THE HIGE VOLTAGE CHECK THE HIGE VOLTAGE OF CRT ABOUT 25.5~27.5KV REFER ITEM S.M.P.S.
  • Page 12 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 7,15.18,21 ABOUT 12V 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 13: 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 16,19,22 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 14: Hor./Osc/Def/Hv Circuit Fault

    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 15 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 137V 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 16: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION READJUST V-SIZE FUNCTION VALUE VALUE CHECK THE IC601 PIN 6 CHECK THE IC601 PIN 7 ABOUT 40V ABOUT 12V CHECK D601, R616 & SMPS CHECK ZD601, ZD602 R626 & SMPS RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK VERT.
  • Page 17 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 18: 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 (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 14.5V, 55V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 19: Parts List Of Cabinet

    8. PARTS LIST OF CABINET Location Specification Remark CMS992X5N CHASSIS FOR S992X-5 1A 503 5T 47 SCREW FOR CRT 5A 38501 RUBBER WASHER 5A600604075S CRT WASHER 5A600605075S CRT WASHER 11A 112 1 A WIRE MOUNTS 11A 112500 WIRE MOUNT 11A 115 1 FBT CLIP 19A 403 7 STEEL...
  • Page 20 95A8013 2 CONNECTOR B1A1035 10128 SCREW 3.5X10 D1A1140 7128 SCREW 4X7(FOR AC) Q1A 340 16128 SCREW 750A1697 76 JK 0.45*90TS DEG COIL 95A205T 3006A Wire Harness 95A2070520 COPPER BRAID Location CMS992X5N CHASSIS FOR S992X-5 Remark AMS992X5N MAIN BOARD FOR S992X-5 CRS992X5N CRT BOARD FOR S992X-5 1A 421 4128...
  • Page 21 Location CMS992X5N CHASSIS FOR S992X-5 Remark C465 67A 30547910T 4.7UF 160V C607 67A 305221 6 220UF +-20% 35V C608 67A 305102 4 1000UF +-20% 25V C612 67A 305102 3 1000 UF +-20% 16V C703 67A 305109 15 1UF +-20% 450V C713 67A 305100 12 10UF +-20% 250V...
  • Page 22 Location CMS992X5N CHASSIS FOR S992X-5 Remark L404 73A 253122 H CHOKE COIL ★ L901 73A 174 2 HA LINE FILTER ★ L902 73A 174 17 G LINE FITTER ★L904 73A 253121 H 125UH +-10% LED2 81A 11 7 GP GP32052CE/DIY-ZY ★NR901 61A 58 8T L NTCR 15OHM+-15%2.5A THIN P106...
  • Page 23 Location CMS992X5N CHASSIS FOR S992X-5 Remark VR701 75A 335223 CFVR 22K OHM +-20% VR702 75A 335204 CFVR 200K OHM +-20% VR703 75A 335104 CFVR 100K OHM +-20% VR902 75A 334303 CFVR 30K OHM +-20% X101 93A 22 22 PT HC-49U 8MHz Crystal Location AMS992X 5N MAIN BOARD FOR S992X-5 M...
  • Page 24 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark C420 64A178J223 1T CL21X 0.022UF 100V +-5% C421 65A 444102 5T 1000 PF 10% 50V Y5P C422 65A 444101 5T 100 PF 10% 50V Y5P C423 65A 450104 7T 0.1UF +80-20% 50V Y5V C424 67A 309100 7T 10UF +-20% 50V...
  • Page 25 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark C701 67A 309100 7T 10UF +-20% 50V C702 65A 1K471 2T 470PF/1KV Y5P+-10% C704 67A 309100 7T 10UF +-20% 50V C705 64A178J103 1T CL21X 0.01UF 100V +-5% C706 67A 309470 7T 47UF +-20% 50V C707 64A178J104 2T...
  • Page 26 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark D405 93A1002 1W52T 1N5817 D406 93A1060 652T F R D BYV26C D407 93A 64 1152T DIODE 1N4148 D409 93A 64 1152T DIODE 1N4148 D410 93A 6450152T SWITCHING DIODE BAV21 D411 93A 64 1152T DIODE 1N4148 D413 93A 64 1152T...
  • Page 27 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark FB903 71A 55 9 T C CORE RF BEAD RH 3.5X6X0. FB904 95A 90 23 TIN COATED FB905 71A 55 19 T FERRITE BEAD 9X3.5X0.8 J001 95A 90 23 TIN COATED J002 95A 90 23 TIN COATED...
  • Page 28 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark J051 95A 90 23 TIN COATED J052 95A 90 23 TIN COATED J053 95A 90 23 TIN COATED J054 95A 90 23 TIN COATED J055 95A 90 23 TIN COATED J056 95A 90 23 TIN COATED J057...
  • Page 29 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark J102 95A 90 23 TIN COATED J103 95A 90 23 TIN COATED J104 95A 90 23 TIN COATED J105 95A 90 23 TIN COATED J106 95A 90 23 TIN COATED J107 95A 90 23 TIN COATED J108...
  • Page 30 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark Q407 57A 446 1 T TRAN.2SC1213AC/HITACHI Q408 57A 420 P T TRAN 2SA733P/NEC TAPING Q409 57A 420 P T TRAN 2SA733P/NEC TAPING Q410 57A 419 P T TRAN 2SC945P/NEC TAPING Q411 57A 419 P T TRAN 2SC945P/NEC TAPING Q413...
  • Page 31 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark R132 61A 60210252T CFR 1K OHM+-5% 1/6W R135 61A 60247252T CFR 4.7K OHM+-5% 1/6W R136 61A 60247252T CFR 4.7K OHM+-5% 1/6W R137 61A 60247252T CFR 4.7K OHM+-5% 1/6W R138 61A 60247252T CFR 4.7K OHM+-5% 1/6W R140 61A 60210352T...
  • Page 32 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark R441 61A 60256352T CFR 56K OHM +-5% 1/6W R442 61A 60247252T CFR 4.7K OHM+-5% 1/6W R443 61A 21013252T MFR 1.3K OHM +- 1% 1/6W R444 61A 60222252T CFR 2.2K OHM +-5% 1/6W R445 61A 60210352T CFR 10K OHM+-5% 1/6W...
  • Page 33 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark R613 61A 60268252T CFR 6.8K OHM+-5% 1/6W R614 61A 21010352T MFR 10K OHM +- 1% 1/6W R615 61A 21030352T MFR 30K OHM +- 1% 1/6W R617 61A175L22152T CFR 220 OHM +-5% 1/2W R619 61A175L15952T CFR 1.5 OHM +-5% 1/2W...
  • Page 34 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark R904 95A 90 23 TIN COATED R905 61A214Y10552T MGFR 1M OHM +-5% 1/4W R906 61A 17215352T CFR 15K OHM +-5% 1/4W R908 95A 90 23 TIN COATED R909 95A 90 23 TIN COATED R913 61A214Y20552T...
  • Page 35 Location AMS992X 5N MAIN BOARD FOR S992X-5 M Remark ZD703 93A 39 2452T HZ15-2 ZD704 93A 3951952T TZX8V2B ZD901 93A 3953052T TZX5V6D ZD902 93A 39 8252T HITACHI HZ12A2 ZD903 93A 3953052T TZX5V6D ZD904 93A 3953252T TZX24B TFK Location CRS992X 5N CRT BOARD FOR S992X-5 Remark ARS992X5N...
  • Page 36 Location ARS992X 5N CRT BOARD FOR S992X-5 Remark C815 65A 450104 7T 0.1UF +80-20% 50V Y5V C816 67A 309101 3T 100UF +-20% 16V C818 64A178J104 0T CL21X0.1UF 63V +-5% C819 65A 44210013T 10PF +-5% NPO 50V C820 65A 44210013T 10PF +-5% NPO 50V C821 64A178J104 0T CL21X0.1UF 63V +-5%...
  • Page 37 Location ARS992X 5N CRT BOARD FOR S992X-5 Remark D856 93A 6431G52T BAV20 D857 93A 6431G52T BAV20 D858 93A 6431G52T BAV20 D863 93A1060 652T F R D BYV26C FB801 71A 55 9 T CORE RF BEAD RH 3.5X6X0. FB805 71A 55 9 T CORE RF BEAD RH 3.5X6X0.
  • Page 38 Location ARS992X 5N CRT BOARD FOR S992X-5 Remark R818 61A 60210152T CFR 100 OHM+-5% 1/6W R820 61A 60216352T CFR 16K OHM +-5% 1/6W R821 61A 60210252T CFR 1K OHM+-5% 1/6W R823 61A 60210252T CFR 1K OHM+-5% 1/6W R824 61A 60210252T CFR 1K OHM+-5% 1/6W R825 61A 60210252T...
  • Page 39 IC601 56A 574 1 TDA9302H BY SGS IC903 56A 133 12 ST 3 PIN 12V REG.L7812CV SG Location 705A992XC56 01A IC901/Q904 ASS'Y Remark 90A6042500 A HEAT SINK M1A1730 10128 SCREW M3x10 IC901 56A 618 1 STR-G8656D LF1129 Q904 57A 724 4 2SK2996 Location 705A992XC57 01A...
  • Page 40 Location 750A5455992AV1 LG 19" 0.26 ART COATIN Remark C418 63A210J4028FC 4000PF/2KV C419 63A210J4027FC 4U 1600V C425 63A210J2243CC .22U 400V C429 63A210J1252MC 1.2UF/250V +-5% C438 63A210J1042BM 0.1UF 250V C439 63A210J3042CC 0.3UF/250V C449 65A 2K121 5A 120PF 2KV C450 65A 2K101 5T 100PF/2KV C453 63A210J2742CM...
  • Page 41 IC101:NT68P61AU IC102:24C08 IC901:STR-G8656D...
  • Page 42 IC401:UPC1888ECT...
  • Page 43 IC804 NT6828-00023 IC801:LM1269NA...
  • Page 44 IC902 MC33260 PIN CONNECTIONS Feedback Input MC33260 Gate Drive YYWW control Oscillator Capacitor(C Synchronization Current Sense Input Input IC803:LM2480NA IC904:PC123 C903:L7812CV...
  • Page 45 IC803 LM2437...
  • Page 46 COM IN...
  • Page 47 P202 P201 715A861-XX CMPC S992X-5 R231 R223 R473 D803 715A868-* C802 IC801 R820 P801 1N4148 FB808 FB802 LM1269NA R857 C815 C840 JUMPER R807 R821 C817 0.01 R805 22UF 1/4W 100V R OSD 100V C830 R808 FLYBACK R819 +12V R802 C808 D856 D804 C856...

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