AOC VGA1581 Service Manual
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AOC VGA1581 Service Manual

AOC VGA1581 Service Manual

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15" CDT Color Monitor
Service
Service
Service
Table Of Contents...................................................1
Revision List........ ...... ... ......... ...... ... ......... ...... ... ..2
I m p o r t a n t S a f e t y N o t i c e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 . S p e c i f i c a t i o n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 . P r e c a u t i o n A n d N o t i c e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 - 1 s a f e t y P r e c a u t i o n s . . . . ... . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . 6
2-2 Product Safety Notice ..........................................6
2 - 3 S e r v i c e N o t i c e s . . . . . . . . . . . . . . . . . . . . ... ... ... ... . . . . . . 7
2-4 High Voltage Warning............................................7
3 . O p e r a t i n g I n s t r u c t i o n s . . . . . . . . . . . . . . . . ... ... . . . . . . . . . . . . . 8
4 . A d j u s t m e n t . . . . . . . . . . . . . . . . . . ... ... ... ... . . . . . . . . . . . . . . . 9
4-2. Main Adjust ment s. .. .. ... ... .. ... ... .. ............. .. ... .. 9
4-3 Adjustment Methods........................................9
5 . C i r c u i t D e s c r i p t i o n . . ... ... ... ... ... ... ... ... ... . . . . . . .. .. . . 1 2
5-2.Transistor & Diode Circuit...............................14
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page
Description
6. Trouble Shooting Chart..............................................15
6-1.No Raster...........................................................15
6-2. Abnormal Displays..............................................17
6-3. Hor./OSC/DEF/HV Circuit Fault................................18
6-4. Abnormal Horizontal Deflection...............................18
6-5. Abnormal Vertical Scanning....................................19
6-6. Side-Pin Cushion Distortion............................19
6-7. Poor Focus................................................19
7. Block Diagram.....................................................21
8. IC Block Diagrams...............................................23
9. PCB Layout.......................................................27
9-1 Main PCB Layout.................................................27
9-2 CRPC Board Layout...........................................29
10. Schematic Diagram.........................................30
12. BOM List...........................................................32
SAFETY NOTICE
1
VGA1581
Horizontal Frequency
30-56 kHz
Page

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Summary of Contents for AOC VGA1581

  • Page 1: Table Of Contents

    15" CDT Color Monitor VGA1581 Service Service Service Horizontal Frequency 30-56 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents...........1 6. Trouble Shooting Chart......…….....15 Revision List............2 6-1.No Raster..……………………………….…..…..15 I m p o r t a n t S a f e t y N o t i c e ....... . . 3 6-2.

  • Page 2: Revision List

    15" CDT Color Monitor VGA1581 Revision List Revision Release Date Change Instruction TPV model Nov-27-06 Initial release D555DJCCWSNBRP...

  • Page 3: Important Safety Notice

    VGA1581 Important Safety Notice Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose.

  • Page 4: Specifications

    15" CDT Color Monitor VGA1581 1. Specifications CRT : 38 cm (15”) F&S high contrast CRT, 0.28mm dot pitch, 90 degree, Shadow mask, non glare, anti- static coating Viewable image Size: 15” F&S (13.8” visual) diagonal Display Color: Unlimited Colors...
  • Page 5 15" CDT Color Monitor VGA1581 15. Power Consumption Mode H-SYNC V-SYNC Video Pw-cons. Indicator Power-On active < 75W Green LED Power-off blanked < 8W Orange LED Power-off blanked < 8W Orange LED Power-off blanked < 8W Orange LED 16. External Connection:...

  • Page 6: Safety Precautions

    15" CDT Color Monitor VGA1581 2. Precautions And Notices 2-1 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.

  • Page 7: High Voltage Warning

    15" CDT Color Monitor VGA1581 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.

  • Page 8: Operating Instructions

    15" CDT Color Monitor VGA1581 3. Operating Instructions This procedure gives you instructions for installing and using the Color display. 1. 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

    15" CDT Color Monitor VGA1581 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.
  • Page 10 15" CDT Color Monitor VGA1581 3. Factory preset timings adjustment: A. When you turn on the monitor, the function LEDs will light Up simultaneously for a while, then extinguish. B. You can press hold the Up/Func tow key simultaneously turn on the monitor, the most left four LEDs will light Up for a while then exitinguish C.
  • Page 11 15" CDT Color Monitor VGA1581 5. Focus Adjustment: A. Set mode6 640×480@60Hz with character full page. B. Set for under RECALL state . C. Then adjust focus VR1 of FBT to the best focus. D. After focus adjustment ,fix Focus VR, G2 VR use the white lacquer.

  • Page 12: C I R C U I T D E S C R I P T I O

    15" CDT Color Monitor VGA1581 5. Circuit Description 5-1 Micro Controller And Deflection Circuit MICRO Controller The micro controller(IC101) core is a 80C51 type. The micro clock frequency of 12 Mhz is derived from the Xtal oscillator, which is running at 48MHz. The DDC interface is suitable to handle DDC2 by a modified hardware I C-bus interface .Standard high current ports,3 ADC pouts with voltage inputs and 4 static standard...
  • Page 13 15" CDT Color Monitor VGA1581 x-ray protection The x-ray protection(pin22) input XRAY provides a voltage detector with a precise voltage input for X-ray protection .If the input voltage at XRAY exceeds the upper threshold for 150us to 300us,the system is forced to shut down by switching off vertical-and B-drive signals.

  • Page 14: 5-2.Transistor & Diode Circuit

    15" CDT Color Monitor VGA1581 5-2 Transistor & Diode Circuit Location Circuit Function Description D901 ~ D904 Bridge Rectifier for AC Source D919 Rectifier for Output Voltage D913 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage...

  • Page 15: Trouble Shooting Chart

    15" CDT Color Monitor VGA1581 6.Trouble Shooting Chart 6-1 No Raster 1.Relative Circuit Problems About CRT 85V, 12V CHECK MAIN PC BOARD CHECK POWER SAVING CIRCUIT, Q908, Q910 CHECK THE HIGE VOLTAGE OF CRT ABOUT 23.5KV ~ 24.5KV CHECK FAILSAFE CKT Q402, Q403 RELATIVE CKT.
  • Page 16 15" CDT Color Monitor VGA1581 2.Abnormal Video Level On Screen CHECK THE VOLTAGE OF IC801 PIN 7 ABOUT 5V CHECK 5V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 17 ABOUT 5Vpp CHECK THE RELATIVE CIRCUIT OF CLAMP.

  • Page 17: Abnormal Displays

    15" CDT Color Monitor VGA1581 6-2 Abnormal Display 1.No Signal On Screen CHECK VIDEO IC VCC ABOUT 5V CHECK THE 12V PIN 10 OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 14, 16, 18 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT...

  • Page 18: Hor./Osc/Def/Hv Circuit Fault

    15" CDT Color Monitor VGA1581 6-3 Hor./Osc/Def/Hv Circuit Fault No Raster (Disconnect With Signal Cable) CHECK IC101 PIN16 ABOUT 5 VDC CHECK IC101 PIN20 RELATIVE CIRCUIT CHECK IC101 PIN 20 WAVE FORM ABOUT 1Vpp CHECK IC401 PIN 39~41 RELATIVE CIRCUIT CHECK THE COLLECTOR VOLTAGE OF Q402 ABOUT 12.5Vpp...

  • Page 19: Abnormal Vertical Scanning

    15" CDT Color Monitor VGA1581 3.Abnormal Horizontal Linearity CHECK L401, Q420, C423, C425 & DY IC101 PIN10(CS2) 6-5 Abnormal Vertical Scanning 1.Abnormal Vertical Size READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 ABOUT 12V PIN1 CHECK D601, C609 RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT...

  • Page 20: Power Supply Trouble Shooting Chart

    15" CDT Color Monitor VGA1581 6-8. Power Supply Trouble Shooting Chart BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 75V - 160V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) (B) CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V...

  • Page 21: Block Diagram

    15" CDT Color Monitor VGA1581 7. Block Diagram IC801 IC802 SIGNAL STV9211 STV9556A CABLE PRE.AMP. 24.5KV FUNCTION FOCUS CONTROL IC101 SAA4848PS/V1016 Q402,T401 Q403,T402(FBT) CRYSTAL 48M HOR. DRIVER HOR.O/P X-RAY PROTECTION Q406 IC601 PINCUSHION & TDA4863A H-SIZE CONTROL VERT.O/P Q705 BLANKING CIRCUIT...
  • Page 22 15" CDT Color Monitor VGA1581 7-1 Block Diagram (Smps) 12.5V Q909 OUTPUTS Q910 RECTIFIED DEGAUSSING T901 RECTIFIE & MOOTHED C.K.T 6.3V Q907 &SMOOTH POWER Q908 6.3V TRANSFORME R162 START C.K.T Q913 RECTIFIED R155 R939,R940 RY901 &SMOOTH L906 D912 FROM IC101...

  • Page 23: Ic Block Diagrams

    15" CDT Color Monitor VGA1581 8. IC Block Diagram IC101 56C1125-A29 ISCL DSDA ISDA DSCL ROTA EEP W/R Unlock CLAMP XTAL2 standby XTAL1 MODE VSSE VDDA VDDD Vssa VSSD BDRV Bsens HBGND AGND HDRV Vref Iref XRAY EWdrv VOUT2 Vfocus...
  • Page 24 15" CDT Color Monitor VGA1581 IC102 ISCL ISDA M24C08-BN6 IC601 TDA4863A +I/P +O/P -I/P IC601 TDA4863A...
  • Page 25 15" CDT Color Monitor VGA1581 IC801 STV9211 56C366-502 R-IN BPCP G-IN R-OUT GNDL B-IN G-OUT GNDA GNDP B-OUT R-OSD IC801 STV9211 G-OSD B-OSD FBLK IC802 STV9556A 56C551-523 R O/P IC802 STV9556A R I/P G O/P B O/P G I/P B I/P...
  • Page 26 15" CDT Color Monitor VGA1581 OCP/FB IC901 STR-G5643D IC901 STR-G5643D...

  • Page 27: Pcb Layout

    15" CDT Color Monitor VGA1581 9. PCB Layout 9-1. Main PCB Layout...
  • Page 28 15" CDT Color Monitor VGA1581...

  • Page 29: Crpc Board Layout

    15" CDT Color Monitor VGA1581 9-2. CRPC Board Layout...

  • Page 30: Schematic Diagram

    The 50V and 16V Capacitance not to label voltage R952 The voltage test condition: IC902 R965 TOP VICTORY ELECTRONICS(FUJIAN)CO.LTD Electric IC801 PIN1.3.5 IC801 PIN14.16.18 IC802 PIN9.10.11 L7805CV R951 4.7 1/4W AOC /Lenovo Input voltage:220V/50Hz,H-FREQ:31KHz,V-FREQ:60Hz; 470 1/4W Engineer 0.7V NOTE1 NOTE2 J031 C425 C423 MODEL: P/N: R953...

  • Page 31: Mechanical Of Cabinet Front Dis-Assembly

    15" CDT Color Monitor VGA1851 11. Mechanical Of Cabinet Front Dis-Assembly...

  • Page 32: Bom List

    XN01A Q1C 340 16128 CR3 SCREW 750A1697 1G L 0.5*80TS AL Degaussing 750C1697R53 NA Rotation Coil J34C 857 GMZ1A BEZEL J40C 15D961 1A ID VGA1581 J41C5021961 1B MANUAL J44C8570961 1A CARTON Q50C 4 10 E089B 89C 73B5MYHT2 SIGNAL CABLE AMD555EXP...
  • Page 33 15" CDT Color Monitor VGA1581 IC101 56C1125A40 IC SAA4848PS/V1047 IC102 56C1133508 M24C08-WBN6P Q909 57C2015 1A TRANSISTOR 2SB772P PR901 61C 52 27 4G PTCR 9OHM +-20% 220V GA R927 61C 208104 64 MOFR 100K OHM+-5% 1W R607 61C 208109 64 MOFR 1OHM +-5% 1W...
  • Page 34 15" CDT Color Monitor VGA1581 95C205T 3006A WIRE HARNESS H802 95C8013 12612 WIRE HARNESS XN01A D1C1140 7128 CR3 SCREW XN01A M1C1140 6128 CR3 SCREW 705C555DC5601A IC901 ASS'Y 705C564BC5701A Q420 ASS'Y E705A 705C564BC5702B Q403 ASS'Y 705C564BC5704A Q911 ASS'Y 705C564BC6101A NR901 ASS'Y...
  • Page 35 15" CDT Color Monitor VGA1581 R419 61C 17210452T 1/4W +-5% 100KOHM R915 61C 17210452T 1/4W +-5% 100KOHM R705 61C 17215152T CFR 150 OHM +-5% 1/4W R405 61C 17218252T CFR 1.8K OHM +-5% 1/4W R918 61C 17222152T CFR 220OHM +-5% 1/4W...
  • Page 36 15" CDT Color Monitor VGA1581 R144 61C 60210352T CFR 10KOHM +-5% 1/6W R902 61C 60210352T CFR 10KOHM +-5% 1/6W R933 61C 60210352T CFR 10KOHM +-5% 1/6W R959 61C 60210352T CFR 10KOHM +-5% 1/6W R982 61C 60210352T CFR 10KOHM +-5% 1/6W...
  • Page 37 15" CDT Color Monitor VGA1581 R725 61C212Y18452T RST MGFR 180 KOHM +-5% R939 61C212Y75452T RST MGFR 750 KOHM +-5% R970 61C214Y11252T 1.1KOHM 1/4W R420 61C214Y22452T RST MGFR 220 KOHM +-5% R715 61C214Y36352T RST MGFR 36KOHM +-5% 1/ R150 61C214Y56352T MGFR 56KOHM +-5% 1/4W...
  • Page 38 15" CDT Color Monitor VGA1581 C433 64C176J104 1T 0.1UF 5% 100V C710 64C176J123 1T 12nF 100V MPE C117 64C176J472 1T 4700PF/100V C414 64C176J474 0T .47UF +-5% 50/63V C601 64C178J102 0T 1000PF C413 64C178J104 0T 0.1UF 50V C608 64C178J104 1T C121X 0.1UF 100V +-5%...
  • Page 39 15" CDT Color Monitor VGA1581 R858 61C 208129 64 MOFR 1.2OHM +-5% 1W R859 61C152M101 64 MOFR 100OHM+-5% 2W R821 61C175L10152T CFR 100 OHM +-5% 1/2W C836 65C 1K102 5T6921 1NF/1KV Y5P+-10% C806 65C 2M103 3B6921 0.01UF 2KV 20% Z5U...
  • Page 40 15" CDT Color Monitor VGA1581 C825 65C 44233013T 33PF +-5% NPO 50V C826 65C 44233013T 33PF +-5% NPO 50V C834 65C 450103 3T 0.01UF +80-20% 50V C811 65C 4501047TV 0.1UF +80-20% 50V C814 65C 4501047TV 0.1UF +80-20% 50V C819 65C 4501047TV 0.1UF +80-20% 50V...
  • Page 41 15" CDT Color Monitor VGA1581 E750A 750C5A62D55AVP LG 15" 非 MPRII C ASS'Y E750A 750C5A62D55AVP LG 15" 非 MPRII P ASS'Y NR601 61C 58101 WT NTCR 100OHM +-15% 3100K 54CDADA12A C 15" CV 0.30 DY E750A 750C5V622AV 长沙 LG 15"CRT 0.28 AG/A...

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