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AOC S792-3 Series Service Manual

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SERVICE MANUAL

COLOR MONITOR

(S792-3 S792W-3 Series)
41AS792W-AOC-A00
F/N : S792W-3-00-A
Date : Oct-18-02
Version : A00

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Summary of Contents for AOC S792-3 Series

  • Page 1: Service Manual

    SERVICE MANUAL COLOR MONITOR (S792-3 S792W-3 Series) 41AS792W-AOC-A00 F/N : S792W-3-00-A Date : Oct-18-02 Version : A00...
  • Page 2 1. SPECIFICATIONS FOR 7Klr SERIES COLOR MONITOR CRT : 43.2CM(17") 90 Deflection, 29mm Neck, Pure flat 0.25mm Dot Pitch, Non-Glare Screen Viewable image Size: 43CM (16") 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 Input Video Signal...

  • Page 3: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 9K 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 4: Adjustment Method

    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 5 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 BOTTOM COMER COLOR TEMPERATURE 9300 BC BC BC BC PINCUSHION 6500 COLOR TEMPERATURE TRAPEZOID DEGAUSS PIN-BALANCE OSD EXIT PARALLELOGRAM RETURN ROTATION Vs LINEAR SUB-H-SIZE...
  • Page 6 (c) Adjust G-Gain , B-Gain , R-Gain , to make color temperature x=283 ± 10, y=297± 10, Y=130~190cd/m C. Recheck item A&B to make sure both of them in spec. Finally select OSD function to the 9300°K function, then press the MENU Key. To make the setting data saved in the memory. D.

  • Page 7: 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 8: 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 9: 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 Q401 B+ Mute Control Q402 Horizontal Driver Q403 Horizontal Out Put Q404, Q406 A differential Amp for Drive Q405 Q405...

  • Page 10: Troubleshooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY CHECK MAIN PCB POWER SUPPLY 61V,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 25.2~26.8KV REFER ITEM S.M.P.S.
  • Page 11 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 12: 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 13: 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 14: 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 60.5V AT FH=31KHz 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 15: 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 16: No Sound (For Audio Model Only)

    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 17: 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 18: Parts List Of Cabinet

    8. PARTS LIST OF CABINET Location P/N Location Specification Specification Remark Remark Location Location Specification Specification Remark Remark CKS792W KEPC BOARD FOR S792W-3 CMS792W5NL CHASSIS FOR S792W-3L 1A 503 5T 47 SCREW FOR CRT 5A 38 8 RUBBER WASHER 11A 112 1 WIRE MOUNTS 11A 112500 WIRE MOUNT...
  • Page 19 85A6028500 SHIELD CASE Location Location P/N Location Location Specification Specification Specification Specification Remark Remark Remark Remark ★ 89A404C18N YH POWER CORD for Euro 95A2070529 WIRE 95A8013 2 CONNECTOR/PIN B1A1035 10128 SCREW 3.5X10 D1A1140 7128 SCREW 4X7(FOR AC) Q1A 340 16128 SCREW Q1A1030 10128 SCREW...
  • Page 20 71A 55 2 FERRITE BEAD 6.5*5*1.7 95A 202 59032 UL1007#22/WHT SOLID Location Location CMS792W5NL Location Location CMS792W5NL CMS792W5NL CMS792W5NL CHASSIS FOR S792W CHASSIS FOR S792W- - - - 3L 3L 3L 3L CHASSIS FOR S792W CHASSIS FOR S792W Remark Remark Remark Remark 95A 205 30032...
  • Page 21 FBTF1 71A 100 9 FERRIRE CORE 28.5*17.5*9 FBTG2 71A 100501 S CORD 95A 900510 GROUND WIRE Location Location CMS792W5NL Location Location CMS792W5NL CMS792W5NL CMS792W5NL CHASSIS FOR S792W CHASSIS FOR S792W- - - - 3L 3L 3L 3L CHASSIS FOR S792W CHASSIS FOR S792W Remark Remark...
  • Page 22 R955 61A 301228 64 FUSER 0.22OHM +-5% 1/2W R964 61A152M100 64 MOFR 10 OHM+-5% 2W R968 61A152M100 64 MOFR 10 OHM+-5% 2W R979 61A153M181 59 MOFR 180 OHM +-5% 3W Location Location CMS792W5NL Location Location CMS792W5NL CMS792W5NL CMS792W5NL CHASSIS FOR S792W CHASSIS FOR S792W- - - - 3L 3L 3L 3L CHASSIS FOR S792W CHASSIS FOR S792W...
  • Page 23 C407 64A176J152 1T 1500PF 100V C408 64A176J104 2T .1UF +-5% 250V C409 67A 309479 7T 4.7UF +-20% 50V C410 65A 442470 9T 47pF/50V SL C412 65A 444101 5T 100 PF 10% 50V Y5P Location Location AMS792W5NL Location Location AMS792W5NL AMS792W5NL AMS792W5NL MAIN BOARD FOR S792W MAIN BOARD FOR S792W- - - - 3 3 3 3...
  • Page 24 C481 67A 309101 4T 100UF +-20% 25V C601 64A178J103 1T CL21X 0.01UF 100V +-5% C602 64A176J102 1T .001UF +-5% 100V C603 67A 309330 3T 33UF +-20% 16V C604 64A 46J3330AT 0.033UF 50V C605 65A 44447113T 470PF +-10% Z5P 50V Location AMS792W5NL Location AMS792W5NL MAIN BOARD FOR S792W- - - - 3 3 3 3...
  • Page 25 C952 67A 305470 3T 47UF +-20% 16V C955 65A517K471 1T 470PF/500 Z5F +-10% C957 64A700J3330AT 0.033UF 63V +-5% C958 64A176J102 1T .001UF +-5% 100V C959 64A176J104 1T 0.1UF 5% 100V D101 93A 64 1152T DIODE 1N4148 D104 93A 64 1152T DIODE 1N4148 Location AMS792W5NL Location...
  • Page 26 D710 93A 64 1152T DIODE 1N4148 D901 93A 64 1152T DIODE 1N4148 ★ D905 93A1060 652T F R D BYV26C D906 93A 6431G52T BAV20 ★ D910 93A1060 652T F R D BYV26C D916 93A 64 1152T DIODE 1N4148 ★ D919 93A1060 652T F R D BYV26C D920...
  • Page 27 J035 95A 90 23 TIN COATED J036 95A 90 23 TIN COATED J037 95A 90 23 TIN COATED J039 95A 90 23 TIN COATED J040 95A 90 23 TIN COATED J041 95A 90 23 TIN COATED J042 95A 90 23 TIN COATED J043 95A 90 23...
  • Page 28 J083 95A 90 23 TIN COATED J084 95A 90 23 TIN COATED J085 95A 90 23 TIN COATED J086 95A 90 23 TIN COATED J087 95A 90 23 TIN COATED J088 95A 90 23 TIN COATED J089 95A 90 23 TIN COATED J090 95A 90 23...
  • Page 29 J131 95A 90 23 TIN COATED J132 95A 90 23 TIN COATED J133 95A 90 23 TIN COATED J136 95A 90 23 TIN COATED J137 95A 90 23 TIN COATED J138 95A 90 23 TIN COATED J139 95A 90 23 TIN COATED J140 95A 90 23...
  • Page 30 ★ Q708 57A 708 1 T 2SC4002E ★ Q709 57A 419 P T TRAN 2SC945P/NEC TAPING ★ Q901 57A 717 1 T BF488 ★ Q910 57A 419 P T TRAN 2SC945P/NEC TAPING ★ Q912 57A 446500 T 3DG1213C ★ Q913 57A 419 P T TRAN 2SC945P/NEC TAPING ★...
  • Page 31 R164 61A 17210952T CFR 1 OHM +-5% 1/4W R168 61A 60210552T CFR 1M OHM+-5% 1/6W R401 61A 60218252T CFR 1.8K OHM+-5% 1/6W R402 61A 17291352T CFR 91KOHM+-5% 1/4W R403 95A 90 23 TIN COATED R404 61A 17247452T CFR 470K OHM +-5% 1/4W R405 61A175L10452T CFR 100K OHM +-5% 1/2W...
  • Page 32 R449 61A 60247252T CFR 4.7K OHM+-5% 1/6W R450 61A 17247452T CFR 470K OHM +-5% 1/4W R452 61A 60215352T CFR 15K OHM+-5% 1/6W R453 61A 60222252T CFR 2.2K OHM +-5% 1/6W R454 95A 90 23 TIN COATED R455 61A 60233252T CFR 3.3K OHM+-5% 1/6W R457 61A175L75952T CFR 7.5 OHM +-5% 1/2W...
  • Page 33 R614 61A 21010352T MFR 10K OHM +- 1% 1/6W R615 61A 21030352T MFR 30K OHM +- 1% 1/6W R617 61A175L18152T CFR 180 OHM +-5% 1/2W R619 61A175L15952T CFR 1.5 OHM +-5% 1/2W R633 95A 90 23 TIN COATED R636 95A 90 23 TIN COATED R701 61A 60210352T...
  • Page 34 ★ R900 61A212Y10652T 10MOHM +-5% 1/2W 妮 R901 61A175L47452T CFR 470K OHM +-5% 1/2W R902 61A214Y13252T MGFR 1.3KOHM +-5% 1/4W 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...
  • Page 35 ZD402 93A 3953052T TZX5V6D ZD407 93A 39 6952T ZENER 6.9-7.2V 0.5W HZ7B ZD408 93A 3951652T TELEFUNKEN TZX5V1B ZD409 93A 3951652T TELEFUNKEN TZX5V1B ZD410 93A 39 5952T HZ4C2 ZD601 93A 3951652T TELEFUNKEN TZX5V1B ZD701 93A 39 7752T HZ5C1 ZD703 93A 39 2452T HZ15-2 ZD704 93A 3951952T TZX8V2B...
  • Page 36 C803 64A176J104 0T 0.1UF 5% 63V C804 64A176J104 0T 0.1UF 5% 63V C805 67A 309101 3T 100UF +-20% 16V C806 67A 309109 7T 1.0UF +-20% 50V C807 67A 309109 7T 1.0UF +-20% 50V C808 65A 44256013T 56PF +-5% NPO 50V C809 67A 309109 7T 1.0UF +-20% 50V...
  • Page 37 C876 65A 44210113T 100PF +-5% NPO 50V C877 65A 44210113T 100PF +-5% NPO 50V C879 65A 1K101 5T 100PF/1KV Y5P+-10% D801 93A 64 1152T DIODE 1N4148 D802 93A 64 1152T DIODE 1N4148 D803 93A 64 1152T DIODE 1N4148 D804 93A 64 1152T DIODE 1N4148 D805 93A 64 1152T...
  • Page 38 ★ L852 73A 5422810T 0.22UH +-10% Q801 65A 44210113T 100PF +-5% NPO 50V Q802 65A 44210113T 100PF +-5% NPO 50V Q803 65A 44210113T 100PF +-5% NPO 50V R801 61A 60275052T CFR 75 OHM+-5% 1/6W R802 61A 60275052T CFR 75 OHM+-5% 1/6W R803 61A 60275052T CFR 75 OHM+-5% 1/6W...
  • Page 39 R856 61A 17251052T CFR 51OHM +-5% 1/4W R857 61A 17210552T CFR 1MOHM +-5% 1/4W R858 61A 17210552T CFR 1MOHM +-5% 1/4W R859 61A 17210552T CFR 1MOHM +-5% 1/4W R860 61A 17210252T CFR 1KOHM +-5% 1/4W R861 61A 17210252T CFR 1KOHM +-5% 1/4W R862 61A 17210252T CFR 1KOHM +-5% 1/4W...
  • Page 40 Location 705A792XC5601A Location 705A792XC5601A IC901/Q904 ASS'Y IC901/Q904 ASS'Y Remark Remark Location Location 705A792XC5601A 705A792XC5601A IC901/Q904 ASS'Y IC901/Q904 ASS'Y Remark Remark 90A6042500 A HEAT SINK M1A1730 10128 SCREW M3x10 ★ IC901 56A 618 1 STR-G8656D LF1129 ★ Q904 57A 724 4 2SK2996 Location 705A792XC5601C Location...
  • Page 41 C419 63A210J4327FC .0043UF +-5% 1600V FOR C C425 63A210J2043CC .2UF/400V +-5% C429 63A210J1052CC 1.0UF 250V C430 65A 2K102 5A 1000PF 10% 2KV Y5P C438 63A210J8233BJ MPA 0.082UF +-5% 400V C439 63A210J3042CM 0.3UF 250V PMH C449 65A 2K121 5A 120PF 2KV C450 65A 2K121 5A 120PF 2KV...
  • Page 42 R498 61A 17256352T CFR 56K OHM +-5% 1/4W R618 61A 208828 64 MOFR 0.82OHM +-5% 1W R632 61A152M479 64 MOFR 4.7 OHM +-5% 2W R735 61A 60210252T CFR 1K OHM+-5% 1/6W ★ T402 79A 790 1 A TP498 95A201M 50132 13"PULSE IC101:NT68P61B IC102:M24C08-BN6...
  • Page 43 IC901:STR-G8656D...
  • Page 44 IC401:UPC1888ECT...
  • Page 45 IC804 NT6828-00023...
  • Page 46 IC802 LM2467TA IC401 TDA4856/41 IC801: LM 1269NA...
  • Page 47 IC803:LM2480NA IC904:PC123FY2 IC903:L7812CV...
  • Page 48 IC601 TDA9302H...
  • Page 49 COM IN...
  • Page 50 P202 P201 P792X-3 715A861-XX CMPC-P792X-3 R223 715A868-* R231 R473 D803 C802 IC801 R820 P801 1N4148 FB808 FB802 LM1269NA C815 R857 C840 JUMPER R807 R821 0.01 R805 1/4W 100V R OSD R808 FLYBACK R819 +12V R802 C808 D856 D804 Q801 C856 C481 G OSD CLAMP...

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S792w-3 series

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