AOC VGA1581 Service Manual Download Page 14 | Manualshive

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AOC VGA1581 Service Manual Download Page 14

15" CDT Color Monitor VGA1581

14

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

D925

Rectifier for B+ Supply

Q911

MOS FET for Switching B+ Control.

Q912, Q906

Push-Pull Topology to Drive Q911

Q913 Degaussing

Switcher

Transistor

Q907

6.3V Regulator Transistor

Q401

Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block

Q402

HOR. Driver Transistor

Q403 HOR.

Transistor

Q420,Q423

Horizontal s correction control MOSFET

Q406

Transistor for H-Size Control

Q705 Brightness

Control

CKT

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Summary of Contents for VGA1581

Page 1: ...Operating Instructions 8 4 Adjustment 9 4 1 Adjustment Conditions And Precautions 9 4 2 Main Adjustments 9 4 3 Adjustment Methods 9 5 Circuit Description 12 5 1 Micro Controller And Deflection Circuit...

Page 2: ...15 CDT Color Monitor VGA1581 2 Revision List Revision Release Date Change Instruction TPV model A00 Nov 27 06 Initial release D555DJCCWSNBRP...

Page 3: ...racteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from AOC AOC assumes no liability express or imp...

Page 4: ...640 V Resolution Lines 400 480 600 768 480 Pixel Clock MHz 28 320 25 168 56 248 65 000 36 000 H Frequency kHz 31 327 31 460 53 670 48 363 43 269 V Frequency Hz 69 616 59 924 84 414 60 004 85 008 IBM V...

Page 5: ...ectromagnetic in the frequency range from 80 MHZ up to 1000 MHZ IEC61000 4 3 EN61000 4 3 passed Disturbance by means of fast transients EFT IEC61000 4 4 EN61000 4 4 passed Disturbance by means of fast...

Page 6: ...ust the relative VR to make sure the B voltage under 59V and well seal it with A B glue or equivalent which you can not move away with one screw driver 7 Before returning a serviced display to the cus...

Page 7: ...ecified rating for the chassis type The maximum operating HV specified for the chassis used in this monitor is 25KV 0 8KV with a line voltage of 120 240 VAC Higher voltage may also increase possibilit...

Page 8: ...or to ensure firm grounding The connector information is as follow 15 Pin Color Display Signal Cable Pin No Description Pin No Description 1 Red Video 9 No Pin 2 Green Video 10 Logic Ground 3 Blue Vid...

Page 9: ...ion Adj DOWN PCB MAIN SW101 4 3 Adjustment Method 1 B voltage adjustment A CHROMA 2000 Signal generator or PC equivalent set TIMING 16 VESA 640X480 pattern 1 0 B Connect a DC Volt meter between D925 p...

Page 10: ...as 5 B Bias 6 R Gain 7 G Gain 8 B Gain 9 ABL 10 VE 11 HE 4 White Balance add Luminance adjustment A Function keys specification Press UP and DOWN and Power on keys LED5 LED6 LED7 LED8 are lighting the...

Page 11: ...y 180 C Check the complete blue and complete green patterns to observe their respective color purity Make minor adjustments if needed Relative Placement Of Typical Components Purity Magnets Deflection...

Page 12: ...uto sync Capability a flexible SMPS block and an extensive set of geometry control facilities Further the IC generates the drive waveforms for DC coupled vertical boosters to the TDA4863A H V sync sig...

Page 13: ...uartz crystal frequencies than 48 MHz cannot be used External capacitors on XTAL1 and XTAL2 are not allowed B Control Function Block The B control block of the SAA4848 has the same behaviour as the TD...

Page 14: ...age D923 Rectifier for Output Voltage D925 Rectifier for B Supply Q911 MOS FET for Switching B Control Q912 Q906 Push Pull Topology to Drive Q911 Q913 Degaussing Switcher Transistor Q907 6 3V Regulato...

Page 15: ...LTAGE CHECK THE VOLTAGE OF CRT HEATER ABOUT 6 3V CHECK VOLTAGE OF THE CRT CHECK BRIGHTNESS CIRCUIT CHECK POWER SAVING CIRCUIT ABNORMAL DISPLAY CHECK FBT D706 R725 C713 Q801 RELATIVE CKT REFER ITEM 6 2...

Page 16: ...7Vpp CHECK THE VIDEO OUTPUT OF R G B APPROACH STANDARD CHECK SIGNAL CABLE OR INTERFACE CARD CHECK THE RELATIVE CIRCUIT OF CLAMP CHECK IC801 PIN 7 ABOUT 5V CHECK IC801 PIN 17 ABOUT 5Vpp CHECK 5V RELAT...

Page 17: ...VOLTAGE OF CHECK THE VOLTAGE OF CRT CATHODE ABOUT 40Vpp CHECK THE VOLTAGE OF FBT SCREEN ABOUT 400 TO 600V CHECK THE RELATIVE CIRCUIT OF SMPS ON MAIN PCB RELATIVE CIRCUIT OF P802 CONNECTOR CHECK THE 85...

Page 18: ...T FH 31KHz D408 C418 C419 H DY B CHECK IC101 PIN16 ABOUT 5 VDC CHECK IC101 PIN 20 WAVE FORM ABOUT 1Vpp CHECK IC101 PIN20 RELATIVE CIRCUIT CHECK IC401 PIN 39 41 6 4 Abnormal Horizontal Deflection 1 Abn...

Page 19: ...VERT OSC CIRCUIT RELATIVE CIRCUIT CHECK THE VOLTAGE OF IC101 NG RELATIVE CIRCUIT CHECK THE IC601 ABOUT 12V PIN1 CHECK D601 C609 RELATIVE CIRCUIT CHECK IC101 PIN 33 34 2 Vertical Center READJUST V CENT...

Page 20: ...6 3V 15V 12V 75V BEAD SET ABNORMAL VARIABLE OUTPUT NG OK NG OK OK NG NG OK OK NG OK NG YES NO CHECK BRIDGE RECTIFIED CIRCUIT 6 3V CIRCUIT CHECK START C K T IT SHALL BE 5V R939 CHECK IC101 CHECK D919 C...

Page 21: ...Q705 BLANKINGCIRCUIT IC802 STV9556A Q406 PINCUSHION H SIZE CONTROL IC801 STV9211 PRE AMP Q403 T402 FBT HOR O P Q402 T401 HOR DRIVER IC601 TDA4863A VERT O P EHT G1 G2 FOCUS X RAYPROTECTION 24 5KV H HV...

Page 22: ...10 L906 R929 RY901 FROM IC101 Q913 Q911 POWER MOSFET OUTPUT RECTIFIE SMOOTHED OUTPUTS RECTIFIE SMOOTH F B FROM H O T H SYNC C K T H SYNC CONTROL S D VCC IC901 CONTROL PWM O P R930 START C K T R939 R94...

Page 23: ...45 46 47 48 51 12 55 56 22 23 24 25 26 27 28 35 34 33 32 31 30 29 LED ISCL ISDA LED Hs Vs DSCL ROTA Pro LED Unlock CLAMP Key CS1 CS2 LED OFF VSSE VDDD V5V VSSD BDRV HBGND HDRV HFB Iref Vref AGND Bsen...

Page 24: ...15 CDT Color Monitor VGA1581 24 M24C08 BN6 IC102 8 5 6 1 2 3 7 4 VCC ISDA ISCL A0 A1 A2 WP A4 TDA4863A IC601 1 3 2 6 7 4 5 VCC N VF I P I P GND O P IC601 TDA4863A...

Page 25: ...8 9 10 11 12 13 14 15 16 17 18 19 20 R IN ABL G IN GNDL B IN GNDA VCC R OSD G OSD B OSD FBLK SCL SDA B OUT GNDP G OUT VCC R OUT BPCP BLH IC802 STV9556A 56C551 523 7 1 9 10 11 5 2 4 6 3 8 Vdd R I P B O...

Page 26: ...15 CDT Color Monitor VGA1581 26 STR G5643D IC901 1 2 3 4 5 D S GND VCC OCP FB IC901 STR G5643D...

Page 27: ...15 CDT Color Monitor VGA1581 27 9 PCB Layout 9 1 Main PCB Layout...

Page 28: ...15 CDT Color Monitor VGA1581 28...

Page 29: ...15 CDT Color Monitor VGA1581 29 9 2 CRPC Board Layout...

Page 30: ...L906 3K3 R713 R803 75 D939 1N4148 100 R165 61A152M 228 64 0 8V 5 NOTE1 DEG ABLadj 73C253 69 T 150uH L405 L804 270 1 4W 6K2 R905 D912 BAV20 13 73C147 523 HM 5V 4K7 R130 D801 1N4148 LED7 6 41V Q911 G 1...

Page 31: ...15 CDT Color Monitor VGA1851 31 11 Mechanical Of Cabinet Front Dis Assembly...

Page 32: ...CARTON 52C 1185 1 BIG TAPE 52C 1186 SMALL TAPE 89C404A15N YH POWER CORD 95C 91205815 WIRE HARNESS 95C2070910 WIRE HARNESS XN01A B1C1035 10128 CR3 SCREW XN01A D1C1140 7128 CR3 SCREW XN01A Q1C 340 16128...

Page 33: ...00VAC C964 65C305M4722B2 4700PF 20 400VAC ACF C907 67C 3010115P 85 100uF 450V C931 67C 215221 9J 220UF 20 100V JAMICO C401 67C 305102 4 1000UF 20 25V C603 67C 305102 4 1000UF 20 25V C605 67C 305102 4...

Page 34: ...ASS RV29 6C 31 4 BRASS RV33 6C 31 4 BRASS RV35 6C 31 4 BRASS RV36 6C 31 4 BRASS RV7 6C 31 4 BRASS RV8 6C 31 4 BRASS RV9 6C 31 4 BRASS RV1 6C 31500 EYELET RV2 6C 31500 EYELET RV5 6C 31500 EYELET RV6 6C...

Page 35: ...68152T CFR 680OHM 5 1 4W R403 61C 17268352T CFR 68K OHM 5 1 4W R941 61C 17291152T 1 4W 5 910OHM R418 61C 17291252T CFR 9 1KOHM 5 1 4W R110 61C 60210052T CFR 10OHM 5 1 6W R111 61C 60210052T CFR 10OHM 5...

Page 36: ...0247052T CFR 47 OHM 5 1 6W R135 61C 60247152T CFR 470OHM 5 1 6W R151 61C 60247152T CFR 470OHM 5 1 6W R154 61C 60247152T CFR 470OHM 5 1 6W R433 61C 60247152T CFR 470OHM 5 1 6W R107 61C 60247252T CFR 4...

Page 37: ...6R DO 15 D474 93C 6026T52T FR107 DO 41 1000V 1A D910 93C 6026W52T FR107 DO 41 1000V 1A D706 93C 6044T52T FR157SDO 41 1000V 1 5A D703 93C 64 1152T DIODE 1N4148 DO 35ODE D104 93C 6451652T 1N4148 D105 93...

Page 38: ...444222 5T 2200PF 10 Y5P 50V C127 65C 44447213T 4700PF 10 Z5P 50V C123 65C 450103 7T 10000PF 50V Y5V 80 2 C101 65C 450104 3T 0 1UF 50V C102 65C 450104 3T 0 1UF 50V C103 65C 450104 3T 0 1UF 50V C120 65...

Page 39: ...10152T CFR 100OHM 5 1 6W R888 61C 60212352T CFR 12K OHM 5 1 6W R804 61C 60230052T CFR 30 OHM 5 1 6W R805 61C 60230052T CFR 30 OHM 5 1 6W R806 61C 60230052T CFR 30 OHM 5 1 6W R801 61C 60275052T CFR 75O...

Page 40: ...R 82OHM 5 3W XN01A M1C1030 6128 CR3 SCREW 32C3028 8 MICA IC601 56C 584 1A IC TDA4863AJ Q406 57C 600 14 MOSFET CEPF630 Q403 57C 706511 ST2310FX 591B D408 93C 220 12 DIODE FMP 2FUR XN01A M1C1730 8128 CR...

Page 41: ...C 15 CV 0 30 DY E750A 750C5V622AV LG 15 CRT 0 28 AG A E750A 750C5V10D55AVM C 15 CPT CRT MPRII C ASS E750A 750C5V10D55AVM P 15 CPT CRT MPRII P ASS DY DY54QDAAATLYC TPV DY TLY 5101C1 E750A 750C5V11 5G 1...

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