AOC 7Alr Series Service Manual
  1. Manuals
  2. Brands
  3. AOC Manuals
  4. Monitor
  5. 7Alr Series
  6. Service manual
AOC 7Alr Series Service Manual

AOC 7Alr Series Service Manual

Color monitor
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
COLOR MONITOR
(7Alr Series)
41AA791V-AOC-A00
P/N : A791V-1C-01-A
Date: Dec-18-01
Ver : A00

Advertisement

Table of Contents
loading

Related Manuals for AOC 7Alr Series

Summary of Contents for AOC 7Alr Series

  • Page 1 SERVICE MANUAL COLOR MONITOR (7Alr Series) 41AA791V-AOC-A00 P/N : A791V-1C-01-A Date: Dec-18-01 Ver : A00...
  • Page 2 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 : December .

  • Page 3: 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 4 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: 40.6CM (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,H-Convergence, V- Convergence language select, Recall, Degaussing, Color Temperature.
  • Page 5 11. Power Source: Switching Mode Power Supply AC 100 ~240V, 50/60Hz Universal Type 12. Operating Temperature: C to 35 C Ambient 13. Humidity : 10% to 85% Relative, Non-Condensing Weight: 17.0 Kgs(Net), 20.5Kgs(Gross) • Dimensions Monitor: Carton: 570(W) × 530(H) × 540(D) mm Monitor: 430(W) ×...

  • Page 6: Precaution And Notices

    2. PRECAUTIONS AND NOTICES 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 7: 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.

  • Page 8: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the 7K 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 9: 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 10 F H :6 8 .7 K H z F V :8 5 .0 H z ９ ３ ０ ０ ６ ５ ０ ０ 　　 　　Ｒ Ｒ     Ｇ 　Ｂ 　　　　Ｇ 　Ｂ CONTRAST H-MOIRE REDUCE BRIGHTNESS V-MOIRE REDUCE(No use) H-CENTER R-GAIN H-SIZE...
  • Page 11 3. White Balance, Luminance adjustment: A. Bias (Low Luminance) adjustment: (a) Set mode 5 1024×768 Fh: 68.6KHz 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 center.

  • Page 12: Circuit Description

    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 13 On Screen Display Controller The IC802 on video board 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. Pin2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R830, C817, R833) and filter (R832, C818) is used to regulate the appropriate bias current for internal oscillator the resonate at specific dot frequency.
  • Page 14 5-4 TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTION AL DESCRIPTION D101 For C103 Discharge Q101 For LED Indicator Control D411 Speed up for Q410 D412 Damping Diode Q405 HDRV Mute Control Q409 Horizontal Driver Q410 Horizontal Out Put Q413 Horizontal Linearity Correction Control Q415~ Q419 Horizontal S-Correction Control Q429~ Q433...
  • Page 15 LOCATION FUNCTION AL DESCRIPTION Q901 MOS FET for Switching Power Control Q904 Start up CKT for IC901 Q912, Q913 To Turn 6.3V Supply Off when the Off Mode is Required Q908, Q909 To Turn 16V Supply Off when the Off or Suspend Mode is Required Q408 MOS FET for B+ Control Q406, Q407...

  • Page 16: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB CHECK MAIN PCB POWER SUPPLY POWER SUPPLY 180V,16V,80V 60.5V, 14.5V, 80V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL CHECK THE HIGE VOLTAGE OF CHECK THE HIGE VOLTAGE CRT ABOUT 25±0.3KV OR Q409 REFER ITEM S.M.P.S.
  • Page 17 2.ABNORMAL VIDEO LEVEL ON SCREEN HECK THE VOLTAGE OF IC801 CHECK THE VOLTAGE OF IC801 PIN7,15,18,21 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 PIN5 CHECK IC801 PIN 15 CLAMP PULSE CLAMP PULSE PI...

  • Page 18: 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 THEOUTPUTVOLTAGE CHECK THE OUTPUT VOLTAGE OF IC801 PIN16,19,22 ABOUT 3Vpp OF IC801 PIN 18, 20, 23 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V...

  • Page 19: Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF CHECK THE RELATIVE CIRCUIT D424,R497,ZD404 ON MAIN PCB OF C433, D410, R635, R636, IC105 ON MAIN PCB CHECK IC801 PIN11 VIDEO PCB,CHECK CHECK IC801 PIN 16 ON VIDEO PCB, G1 RELATIVE CIRCUIT CHECK G1 RELATIVE CIRCUIT Q702,Q703,Q704,C711,C712...

  • Page 20: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL WIDTH OF VIDEO READJUST H-WIDTH FUNCTION CHECK THE RELATIVE CIRCUIT CHECK THE RELATIE CIRCUIT OF Q409 OF Q404, Q405, & Q406 CHECK FBT B+ VOLTAGE CHECK FBT B+ VOLTAGE AT Q408 GATE ABOUT 60.0V AT FH=31KHz CHECK THE RELATIVE CHECK THE RELATIVE CIRCUIT OF SMPS.

  • Page 21: 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 CHECK THE IC601 PIN 7 ABOUT 40V PIN3,2 ABOUT 13V CHECK D601,D602,R606 CHECK ZD601, ZD602 R626 & SMPS R609& SMPS RELATIVE RELATIVE CIRCUIT CIRCUIT CHECK VERT.

  • Page 22: 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) CONSTANT OUTPUT : 6.5V, 16V, 80V, 180 V, -10V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE THE VARIABLE VOLT 120V OR 220V OUTPUT IS NOT SHORTED...

  • Page 23: Mechanical Of Cabinet Front Dis-Assembly

    7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...
  • Page 24 8. PARTS LIST OF CABINET PARTS LIST OF CABINET LOCATION A791V-1C SPECIFIATION REMARK CMA791VNC CHASSIS 1A 503- 5T- 47 SCREW 5A 38- 8 RUBBER WASHER 11A 112-500 WIRE MOUNT 11A 115- 1 FBT CLIP 12A 385- 1 RUBBER FOOT 19A 403- 7 STEEL 19A 506- 5 SPRING...
  • Page 25 PARTS LIST OF CHAS LOCATION CMA791VN SPECIFICATION REMARK AMA791VNC MAIN BOARD CRA791VNC CRT BOARD 1A 421- 4-128 SCREW 9A 203- 9 NR901 11A 141- 1 PCB SUPPORT 15A5640- 1- A AL GND LUG 15A5659-500- 2 Rear Bracket 40A 581- 26-702 FAIL-SAFE LABEL 40A 581-624- 2A CHASSIS LABEL...
  • Page 26 LOCATION CMA791VN SPECIFICATION REMARK C711 67A 309-100- 11 10UF +-20% 200V C728 67A 305-101- 9 100UF +-20% 100V C901 63A 107-224- H INTERFERENCE SUPPRESSORS C902 65A305M-332-2B2 3300PF 250VAC/400VAC C903 65A305M-332-2B2 3300PF 250VAC/400VAC C904 67A 30-151-15D 150UF +-20% 450V HEC C905 65A305M-472-2B2 4700PF +-20% 400VAC PY17 C907...
  • Page 27 LOCATION CMA791VN SPECIFICATION REMARK IC905 56A 538- 5 MC33260P IC906 56A 192- 6 LM358N ST IC907 56A 133- 5- ST VOLT REG.L7805CV/SGS-THO J137 95A 90- 23 TIN COATED FOR X101 L401 73A 253-106- L CHOKE COIL L402 73A 253-111- T CHOKE COIL L901 73A 174- 2- SA...
  • Page 28 LOCATION CMA791VN SPECIFICATION REMARK R929 61A175L-102-52T CFR 1K OHM +-5% 1/2W R938 61A 208-114- 64 MOFR 110K OHM +-5% 1W R944 61A 208-333- 64 MOFR 33K OHM +-5% 1W R953 61A 20K-478-GE1 CEMENTR 0.47OHM +-10% 5W R958 61A 208-390- 64 MOFR 39 OHM +-5% 1W RA101 61A 124-472- 6...
  • Page 29 LOCATION AMA791VN SPECIFICATION REMARK C204 67A 309-101- 3T 100UF +-20% 16V C205 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C206 67A 309-100- 7T 10UF +-20% 50V C207 64A176J-152- 1T 1500PF 100V C208 64A701J-224-0AT 0.22uF/50V +-5% C402 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C403 67A 309-220- 7T 22UF +-20% 50V...
  • Page 30 LOCATION AMA791VN SPECIFICATION REMARK C611 65A 444-152- 5T 1500PF 10% Y5P 50V C612 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C621 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C701 65A 450-223- 4T 22000PF -20 +80% 50V Z5V C702 67A 309-228- 7T 0.22UF +-20% 50V C705 65A 1K-471- 2T...
  • Page 31 LOCATION AMA791VN SPECIFICATION REMARK D201 93A 64- 11-52T DIODE 1N4148 D202 93A 64- 11-52T DIODE 1N4148 D203 93A 64- 11-52T DIODE 1N4148 D401 93A 64- 11-52T DIODE 1N4148 D402 93A 64- 11-52T DIODE 1N4148 D403 93A 64- 11-52T DIODE 1N4148 D404 93A 64- 11-52T DIODE 1N4148...
  • Page 32 LOCATION AMA791VN SPECIFICATION REMARK D911 93A 64- 11-52T DIODE 1N4148 D914 93A1040- 2-52T F.R.D UF4004/GIT D919 93A 64- 11-52T DIODE 1N4148 D920 93A 60-210-52T IN5819 D921 93A 64- 11-52T DIODE 1N4148 FB401 71A 55- 19- T FERRITE BEAD FB901 71A 55- 19- T FERRITE BEAD FB903 71A 55- 19- T...
  • Page 33 LOCATION AMA791VN SPECIFICATION REMARK J063 95A 90- 23 TIN COATED J064 95A 90- 23 TIN COATED J065 95A 90- 23 TIN COATED J066 95A 90- 23 TIN COATED J067 95A 90- 23 TIN COATED J068 95A 90- 23 TIN COATED J069 95A 90- 23 TIN COATED...
  • Page 34 LOCATION AMA791VN SPECIFICATION REMARK J127 95A 90- 23 TIN COATED J128 95A 90- 23 TIN COATED J129 95A 90- 23 TIN COATED J131 95A 90- 23 TIN COATED J132 95A 90- 23 TIN COATED J133 95A 90- 23 TIN COATED J135 95A 90- 23 TIN COATED...
  • Page 35 LOCATION AMA791VN SPECIFICATION REMARK Q417 57A 721- 2- T AA1A4M Q418 57A 721- 2- T AA1A4M Q419 57A 721- 2- T AA1A4M Q423 57A 419- PP- T 2PC945P/PHILIPS Q424 57A 420- PP- T 2PA733P PHILIPS PNP TRAN Q425 57A 419- PP- T 2PC945P/PHILIPS Q426 57A 420- PP- T...
  • Page 36 LOCATION AMA791VN SPECIFICATION REMARK R207 61A175L-220-52T CFR 22 OHM +-5% 1/2W R208 61A 602-103-52T CFR 10K OHM+-5% 1/6W R209 61A 602-222-52T CFR 2.2K OHM +-5% 1/6W R210 61A 602-153-52T CFR 15K OHM+-5% 1/6W R211 61A 602-473-52T CFR 47K OHM+-5% 1/6W R212 61A 602-432-52T CFR 4.3K OHM+-5% 1/6W...
  • Page 37 LOCATION AMA791VN SPECIFICATION REMARK R446 61A 602-153-52T CFR 15K OHM+-5% 1/6W R447 61A 602-222-52T CFR 2.2K OHM +-5% 1/6W R448 61A 602-472-52T CFR 4.7K OHM+-5% 1/6W R451 61A 172-201-52T CFR 200OHM+-5% 1/4W R452 61A 602-153-52T CFR 15K OHM+-5% 1/6W R454 61A 602-153-52T CFR 15K OHM+-5% 1/6W R456...
  • Page 38 LOCATION AMA791VN SPECIFICATION REMARK R627 61A 172-150-52T CFR 15 OHM +-5% 1/4W R701 61A 172-104-52T CFR100K OHM +-5% 1/4W R702 61A175L-102-52T CFR 1K OHM +-5% 1/2W R703 61A 602-102-52T CFR 1K OHM+-5% 1/6W R704 61A 602-223-52T CFR 22K OHM+-5% 1/6W R706 61A175L-105-52T CFR 1M OHM +-5% 1/2W...
  • Page 39 LOCATION AMA791VN SPECIFICATION REMARK R913 61A 172-229-52T CFR 2.2OHM+-5% 1/4W R915 61A 172-334-52T CFR 330K OHM +-5% 1/4W R916 61A 172-820-52T CFR 82 OHM +-5% 1/4W R917 61A 172-330-52T CFR 33OHM+-5% 1/4W R918 61A 172-103-52T CFR 10KOHM +-5% 1/4W R920 61A 172-471-52T CFR 470OHM +-5% 1/4W R921...
  • Page 40 LOCATION CRA791VN SPECIFICATION REMARK 87A3504- 1- A HPS0720-01100 87A3504- RC- A CRT SOCKET ISDWO BY INC 705A791U-R56-01S IC803 ASS'Y C841 65A 442-181-13T 180PF +-5% NPO 50V Q801 B.E C842 65A 442-181-13T 180PF +-5% NPO 50V Q802 B.E C843 65A 442-181-13T 180PF +-5% NPO 50V Q803 B.E C865...
  • Page 41 LOCATION ARA791VN SPECIFICATION REMARK C827 65A 442-100-13T 10PF +-5% NPO 50V C828 65A 442-100-13T 10PF +-5% NPO 50V C840 67A 309-109- 9T 1UF +-20% 100V C848 65A517K-102- 5T 1000PF 500V +-10% Y5P C851 67A 309-470- 7T 47UF +-20% 50V C852 65A 450-104- 7T 0.1UF +80-20% 50V Y5V C853...
  • Page 42 LOCATION ARA791VN SPECIFICATION REMARK FB808 71A 55- 19- T FERRITE BEAD FB809 71A 55- 19- T FERRITE BEAD FB850 71A 55- 19- T FERRITE BEAD FB851 71A 55- 19- T FERRITE BEAD J801 95A 90- 23 TIN COATED J803 95A 90- 23 TIN COATED J804 95A 90- 23...
  • Page 43 LOCATION ARA791VN SPECIFICATION REMARK R824 61A 602-100-52T CFR 10 OHM +-5% 1/6W R825 61A 602-100-52T CFR 10 OHM +-5% 1/6W R826 61A 602-100-52T CFR 10 OHM +-5% 1/6W R827 61A 602-471-52T CFR 470 OHM +-5% 1/6W R828 61A 602-103-52T CFR 10K OHM+-5% 1/6W R829 61A 602-103-52T CFR 10K OHM+-5% 1/6W...
  • Page 44 PARTS LIST OF IC803 ASS'Y LOCATION PARTS NO. SEPCIFICATION REMARK 90A 355- 2 HEAT SINK M1A1730- 6-128 SCREW M3x6 IC803 56A 551-501 LM2437T PARTS LIST OF IC601 ASS'Y LOCATION PARTS NO. SEPCIFICATION REMARK 5A 71- 1 TRANSISTOR HOUSING 12A 386- 1 90A 348-499 Heat Sink M1A1730- 12-128...
  • Page 45 PARTS LIST OF 17" TCO ASS'Y LOCATION 750A57262AVH SEPCIFICATION REMARK 750A5726-2AV MITSUBISHI 17"FLAT 95K H C715 65A 1K-102- 1T 1NF/1KV Z5F +-10% C716 65A 1K-102- 1T 1NF/1KV Z5F +-10% R716 61A 172-153-52T CFR 15K OHM +-5% 1/4W TP902 95A201F- 50-252 25"WIRE...

  • Page 46: Block Diagram (Deflection)

    9. BLOCK DIAGRAM...

  • Page 47: Ic Block Diagrams

    10. IC BLOCK DIAGRAM IC101 NT6861 IC201/IC701/IC906 LM358...
  • Page 48 IC102 24C08 IC401 TDA4856 EW-OUTPUT V-SYNC INPUT VERTICAL EHT COMPENSATION V-OUTPUT V-SYNC H-PINCUSHION AND POLARITY OSCILLATOR INTEGRATOR H-SIZE AND V-SIZE H-CORNER CORRECTION AND AGC V-LINEARITY H-TRAPEZIUM V-LINEARITY BALANCE H-SIZE VIDEO V-POSITION CLAMPING V-SIZE,VOVSCN AND V-BLANK HUNLOCK OUTPUT PROTECTION OUTPUT ASYMMETRIC AND SOFT START EW-CORRECTION I C-BUS...
  • Page 49 IC402 TC4538 IC601 TDA8172/TDA9302 OUTPUT SUPPLY STAGE FLYBACK VOLTAGE SUPPLY GENERATOR INVERTING INPUT OUTPUT NON-INVERTING INPUT GROUND...
  • Page 50 IC801 TDA4887 IC802 NT6828...
  • Page 51 IC803 LM2437 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...
  • Page 52 IC905 IC102 IC902 TL431 IC903 PC123/SFH615 TL431 ST24W04 PRE 1 REFERENCE CATHODE MODE/WC 2.5Vref ANODE IC904 LM7812 SERIES INPUT PASS OUTPUT ELEMENT CURRENT GENERATOR PROTECTION STARTING REFERENCE ERROR VOLTAGE AMPLIFIER CIRCUIT THERMAL PROTECTION IC906 MC33260 Feedback Input Gate Drive control Oscillator Capacitor(C Synchronization...

  • Page 53: Pcb Layout

    11 PCB LAYOUT 11-1 MAIN PCB LAYOUT SW10 R110 SW101 R103 R106 C415 R104 R105 J073 R107 R430 C401 R403 LED2 J074 LED4 LED1 D405 R429 R402 R427 LED3 J149 C404 J011 J075 R140 Q203 C460 Q204 R218 J076 Q402 R209 C201 R410...
  • Page 54 11-2 CRT BOARD LAYOUT C869 C876 C857 C865 R861 D861 C860 J806 FB806 Q854 Q851 C822 C821 C864 J818 C808 C826 IC803 R876 R852 C820 R817 Q852 R855 C806 FB807 R829 R870 L851 C854 J821 ZD801 R874 D858 SG801 R869 R859 SG803 R843...

This manual is also suitable for:

41aa791v-aoc-a00

Table of Contents