AOC S761U Service Manual Download Page 16 | Manualshive

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AOC S761U Service Manual Download Page 16

16

2.ABNORMAL VIDEO LEVEL ON SCREEN

OK

NG

OK

NG

NG

OK

OK

CHECK THE VOLTAGE OF IC801

CHECK THE SIGNAL INPUT OF R.G.B.

ABOUT 0.7Vpp

CHECK THE VIDEO OUTPUT OF IC801

R.G.B. APPROACH STANDARD

CHECK SIGNAL CABLE OR

INTERFACE CARD.

CONTRAST SET MAX.

PIN 2, 16 ABOUT 8V

CHECK 8V RELATIVE CIRCUIT

CHECK THE IC801 PIN 11

RELATIVE CIRCUIT

RELATIVE CIRCUIT

CHECK IC801 PIN 11 CLAMP PULSE

PIN 13, 15, 18 ABOUT 4Vpp,

CHECK IC801 PIN 3/PIN 5/PIN 8 & PIN 10

3. ABNORMAL DDC (PLUG & PLAY)

OK

NG

CHECK IC101 PIN 5 VOLTAGE ABOUT 5V

CHECK SIGNAL CABLE

CHECK Q921 GOOD OR FAIL

OR H802 PIN 2, 3 DATA OUTPUT

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Summary of Contents for S761U

Page 1: ...SERVICE MANUAL COLOR MONITOR SPECTRUM 7V SERIES S761U V 41AS761 E11 ...

Page 2: ...LLER CIRCUIT 12 5 2 DEFLECTION CIRCUIT 13 5 3 TRANSISTOR DIODE CIRCUIT 14 6 TROUBLE SHOOTING CHART 15 6 1 NO RASTER CRT RELATIVE CIRCUIT PROBLEMS 15 6 2 ABNORMAL DISPLAY 17 6 3 NO BLANKING 18 6 4 HOR OSC DEF HV CIRCUIT FAULT 18 6 5 ABNORMAL HORIZONTAL DEFLECTION 19 6 6 ABNORMAL VERTICAL SCANNING 20 6 7 SIDE PIN CUSHION DISTORTION 20 6 8 POOR FOCUS 20 6 9 POWER SUPPLY TROUBLE SHOOTING CHART 21 7 ME...

Page 3: ... Analog RGB Analog RGB Analog RGB Analog RGB Analog Horiz Sync TTL Level TTL Level TTL Level TTL Level TTL Level TTL Level Negative Negative Negative Positive Positive Positive Vert Sync TTL Level TTL Level TTL Level TTL Level TTL Level TTL Level Negative Positive Negative Positive Positive Positive Horizontal 640 H 720 H 640 H 800 H 1280 H 1024 H Vertical 480 V 400 V 480 V 600 V 1024 V 768 V Fh K...

Page 4: ...0 C to 40 C Ambient 13 Humidity 10 to 85 Relative Non Condensing 14 Weight 15 5 Kgs Net 17 5Kgs Gross 15 Dimensions Monitor Carton 495 W 455 H 525 D mm Monitor 410 W 402 H 420 D mm 16 External Connection 15 Pin D type Connector AC Power Cord 17 Regulations UL CSA FDA FCC TÜV GS CE MPR II TCO 95 or TCO 99 ...

Page 5: ...t use a line isolation transformer during this check b Use an AC voltmeter having 5000 ohms per volt or with more sensitivity in the following manner Connect a 1500 ohms 10 Watt resistor paralleled by a 0 15UF AC type capacitor between a known good earth ground water pipe conduit etc and the exposed metallic parts simultaneously Measure the AC voltage across the combination of 1500 ohms resistor a...

Page 6: ...ply It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere else in the monitor that could cause a rise in high voltage or operating supply voltages No changes should be made to the original design of the monitor Components shown in the shaded areas on the schematic should be replaced with exact factory replacement parts The use of un...

Page 7: ...ews on the connector to ensure firm grounding The connector information is as follow 15 Pin Color Display Signal Cable PIN NO DESCRIPTION PIN NO DESCRIPTION 1 RED 9 NC 2 GREEN 10 GND 3 BLUE 11 SYNC GND 4 GND 12 SDA 5 GND 13 HORIZ SYNC 6 GND R 14 VERT SYNC VCLK 7 GND G 15 SCL 8 GND B 3 Apply power to the display by turning the power switch to the ON position and allow about thirty seconds for displ...

Page 8: ... MAIN SW104 4 3 ADJUSTMENT METHOD 1 14V B HV voltage adjustment A Chroma 2000 Signal generator or PC equivalent set mode 1 VGA 640X480 pattern 1 0 B Connect a DC Volt meter between TP901 and ground then adjust VR903 to be 14VDC C Connect a DC Volt meter between TP902 and ground then adjust VR902 to be 59 5 VDC 2 Factory preset Timings Adjustment A Press MENU Key to show OSD window press Up or Down...

Page 9: ...RIGHTNESS V MOIRE REDUCE H CENTER R GAIN H SIZE G GAIN V CENTER B GAIN V SIZE R BIAS ZOOM G BIAS PINCUSHION R BIAS TRAPEZOID 9300 COLOR TEMPERATURE PIN BALANCE 6500 COLOR TEMPERATURE PARALLELOGRAM DEGAUSS ROTATION OSD EXIT CORNER RETURN H 31 4KHZ V 59 8HZ ...

Page 10: ...to 20 window white pattern then adjust contrast to 148 2 cd 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 The adjustment of 6500 K white Balance May follow step A C with the x 313 10 y 329 10 E Full white luminance a Set mode 1 640 480 Fh 31 5KHz full white pattern b I...

Page 11: ...ue lines are converged by varying the angle between the two tabs of the 4 pole magnets on the PCM assembly See above diagrams D Horizontal red and blue lines are converged by varying the two tabs together keeping the angle between them constant E Produce a white crosshatch pattern on the display F Vertical green and magenta lines are converged by varying the angle between the two tabs of the 6 pol...

Page 12: ...nitor testing use On Screen Display Controller The IC105 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 R154 C166 R155 and filter R...

Page 13: ...nt on the oscillator saw tooth voltage The PLL loop filter C435 C437 R411 D403 is connected to Pin7 PLL2 Phase Detector This phase detector is similar to the PLL1 detector and compares the line flyback pulse at pin 12 with the oscillator saw tooth voltage The PLL2 detector thus compensates for the delay in the external H deflection circuit by adjusting the phase of the HDRV output pulses The phase...

Page 14: ... Voltage Q909 Q910 Use for Standy By or Suspend Mode to Cut off 14V Supply Voltage Q912 Q920 Push Pull Topology to Drive Q911 Q913 Degaussing Switcher Transistor Q921 5V Regulator Transistor Q401 Turn on at Power ON OFF and Change Mode to Protect Hor Block Q402 HOR Driver Transistor Q407 Q408 As a Switcher for Horizontal S Correction CKT Q426 Horizontal s correction control MOSFET Q404 Q405 As Dif...

Page 15: ...POWER SAVING CIRCUIT ABNORMAL DISPLAY H SYNC V SYNC SIGNAL CHECK SCREEN VOLTAGE ABOUT LESS THAN 300V CHECK FBT CHECK MAIN PCB POWER SUPPLY CHECK FAILSAFE CKT IC401 Q909 Q910 CHECK CRT S HEATER RELATIVE CIRCUIT Q907 Q908 Q703 Q704 Q705 RELATIVE CKT PIN 25 RELATIVE CKT OF CRT ABOUT 24 5 25 5KV 400V TO 600V REFER ITEM 6 2 53V 14V 78V CATHODE ABOUT 55V TO 65V CHECK THE HIGE VOLTAGE OF CRT ABOUT 24 5 1...

Page 16: ...CHECK SIGNAL CABLE OR INTERFACE CARD CONTRAST SET MAX PIN 2 16 ABOUT 8V CHECK 8V RELATIVE CIRCUIT CHECK THE IC801 PIN 11 RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK IC801 PIN 11 CLAMP PULSE PIN 13 15 18 ABOUT 4Vpp CHECK IC801 PIN 3 PIN 5 PIN 8 PIN 10 3 ABNORMAL DDC PLUG PLAY OK NG CHECK IC101 PIN 5 VOLTAGE ABOUT 5V CHECK SIGNAL CABLE CHECK Q921 GOOD OR FAIL OR H802 PIN 2 3 DATA OUTPUT ...

Page 17: ...F FBT SCREEN CHECK THE RELATIVE CIRCUIT CHECK THE 12V PIN OF SMPS ON MAIN PCB RELATIVE CIRCUIT OF P802 CONNECTOR ABOUT 400V TO 700V EXCEED 700V CHECK FBT CRT RELATIVE CIRCUIT CHECK VIDEO IC801 VCC ABOUT 8V OF IC801 PIN 13 15 18 ABOUT 3Vpp CHECK THE IC802 OF IC801 PIN 2 PIN 16 Vcc CIRCUIT OR REFER ITEM 6 1 VIDEO PCB ABOUT 78V CHECK THE 78V RELATIVE CIRCUIT CHECK THE VOLTAGE OF FBT SCREEN ABOUT 450V...

Page 18: ...G NG NG CHECK THE COLLECTOR VOLTAGE CHECK THE COLLECTOR VOLTAGE RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK Q402 T401 CHECK T401 T402 Q402 Q403 ABOUT 3Vpp OF Q403 ABOUT 1200Vpp AT FH 31KHz D408 C418 C419 H DY B CHECK IC401 PIN 26 WAVE FORM CHECK IC401 PIN 4 7 PIN 13 CHECK IC401 PIN 29 ABOUT 12 VDC CHECK IC401 PIN 29 RELATIVE CIRCUIT OF Q402 ABOUT 20Vpp CHECK R858 ON VIDEO PCB CHECK G1 RELATIVE CIRCUIT...

Page 19: ...DTH FUNCTION OF Q404 Q405 Q406 CHECK THE HV OF CHECK FBT B VOLTAGE CRT ABOUT 25KV ABOUT 60V AT FH 31KHz 2 ABNORMAL HORIZONTAL RASTER CENTER CHECK D418 D419 R457 R458 L404 3 ABNORMAL HORIZONTAL VIDEO CENTER RELATIVE CIRCUIT CHECK IC401 PIN 4 7 4 ABNORMAL HORIZONTAL LINEARITY AND IC101 PIN 28 29 CHECK L401 L403 Q426 RY401 CHECK THE HV OF CRT ABOUT 24 5KV ...

Page 20: ...K THE VOLTAGE OF IC101 RELATIVE CIRCUIT CHECK IC401 PIN 20 21 22 23 CHECK THE IC601 PIN 2 ABOUT 11 8V PIN 4 ABOUT 12V CHECK D601 C605 2 VERTICAL CENTER NG READJUST V CENTER RELATIVE CKT CHECK IC401 AND IC601 6 7 SIDE PIN CUSHION DISTORTION NG READJUST SIDEPIN CHECK IC401 Q404 Q405 Q406 RELATIVE CKT 6 8 POOR FOCUS READJUST FOCUS CONTROL NG CHECK FOCUS CONTROL UNIT FOCUS LEAD WIRE CRT SOCKET CRT ...

Page 21: ...OK NG OK OK NG NG NG OK OK OK NG OK NG YES NO CHECK BRIDGE RECTIFIED CIRCUIT CHECK START C K T CHECK IC401 CHECK D919 CHECK Q911 Q911 FAILURE CHECK Q901 CHECK IC901 CHECK AC LINE VOLT 120V OR 220V CHECK F901 SW901 CHECK LINE RECTIFIED SMOOTHED VOLT CHECK Q901 IC901 FAILURE CHECK T901 O P MAKE SURE THAT THE VARIABLE OK OUTPUT IS NOT SHORTED R928 R932 D911 D917 PIN 14 15 16 28 B DRIVER 6 3V 12V CIRC...

Page 22: ...7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...

Page 23: ...OT GND LABEL 40A 581 26 704 SHIPPING LABEL 40A2041 615 2A ID LABEL 41A 68 508 A CARD 41A 68 615 1C WARRANTY MANUAL 41A 561 615 2B MANUAL 44A3222 1 EPS CUSHION 44A3222 2 EPS CUSHION 44A3222 615 4G CARTON 45A 76 28 RN pe bag 45A 76 34 RN PE BAG 45A 77 500 BARCODE RIBBON 45A 77 501 BARCODE RIBBON 45A 88 7 RN Monitor PE BAG 85A 582 1 SHIELD 89A404C 18N LN POWER CORD 95A 91 205 670 WIRE 95A8013 2 WIRE ...

Page 24: ...TION 715A 757 1 P C BRD E601 77A 700 1 F ENCODER H601 95A8013 4 16 HARNESS 4P 4P 230MM R191 61A 602 202 52T CFR 2K OHM 5 1 6W PARTS LIST OF CHAS LOCATION CMS761U2N SPECIFICATION AMS761U MAIN PC BOARD ASS Y CRS761U CRT BOARD ASS Y ...

Page 25: ...LOCATION CMS761U2N SPECIFICATION ...

Page 26: ...LOCATION CMS761U2N SPECIFICATION LOCATION CMS761U2N SPECIFICATION ...

Page 27: ... PARTS LIST OF MAIN PC BOARD LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION ...

Page 28: ......

Page 29: ...LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION ...

Page 30: ...LOCATION AMS761U SPECIFICATION ...

Page 31: ...LOCATION AMS761U SPECIFICATION ...

Page 32: ...LOCATION AMS761U SPECIFICATION ...

Page 33: ......

Page 34: ...LOCATION AMS761U SPECIFICATION ...

Page 35: ...LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION ...

Page 36: ...LOCATION AMS761U SPECIFICATION ...

Page 37: ...LOCATION AMS761U SPECIFICATION ...

Page 38: ......

Page 39: ...LOCATION AMS761U SPECIFICATION PARTS LIST OF CRT PC BOARD LOCATION CRS761U SPECIFICATION ARS761U CRT BOARD ...

Page 40: ...PARTS LIST OF CRT AUTO INS PC BOARD LOCATION ARS761U SPECIFICATION LOCATION ARS761U SPECIFICATION ...

Page 41: ......

Page 42: ...LOCATION ARS761U SPECIFICATION ...

Page 43: ...LOCATION ARS761U SPECIFICATION PARTS LIST OF IC802 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF IC601 ASS Y LOCATION PARTS No SPECIFICATION ...

Page 44: ...ION PARTS No SPECIFICATION PARTS LIST OF IC101 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF Q403 Q406 D408 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF Q901 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF Q911 ASS Y ...

Page 45: ...F NR901 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF AC SOCKET ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF D919 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF Q431 ASS Y LOCATION PARTS No SPECIFICATION PARTS LIST OF Q428 ASS Y ...

Page 46: ...LOCATION PARTS No SPECIFICATION PARTS LIST OF CRT ALTERNATION LOCATION PARTS No SPECIFICATION PARTS LIST OF CRT ALTERNATION LOCATION PARTS No SPECIFICATION ...

Page 47: ...9111 IC802 Q404 Q405 Q406 Q909 Q910 Q907 Q908 LM1279N IC401 IC801 Q403 T402 FBT Q402 T401 IC601 EHT VERT HOR OSC HOR O P G1 G2 FOCUS PRE AMP HOR DRIVER X RAY PROTECTION PINCUSHION VERT O P CONTROL 25KV H V BLANKING CIRCUIT H SIZE CONTROL SAVING POWER HV CPU IC101 CRT B G R B G R CABLE SIGNAL IC802 LM2439 ...

Page 48: ...06 R929 RY901 90V 264V IC101 CPU FROM Q913 Q911 OUTPUT B VARIABLE MOSFET POWER VARI SMOOTHED SMOOTHED RECTIFIED RECTIFIED OUTPUTS 4 CONTROL H O T FROM C K T H SYNC H SYNC Is O P F B VCC MOSFET POWER Q901 8 3 6 2 7 IC901 PWM O P CONTROL C K T START AC INPUT FILTER LINE SWITCH ON OFF POWER C K T DEGAUSSING VIN SMOOTHED SMOOTHED RECTIFIED RECTIFIED TRANSFORMER TRANSFORMER POWER ...

Page 49: ... VSYNC0 P05 DAC13 P04 DAC12 P03 DAC11 P02 DAC10 P01 DAC9 P00 DAC8 P31 SCL P30 SDA P20 P21 P22 P23 P24 P25 P26 P27 P16 INTE P10 AD0 P11 AD1 P12 HALFH0 P13 HALFH1 CE P14 P15 OSC1 OSC0 VDD DAC0 DAC1 DAC2 30 15 14 13 12 11 31 32 33 34 35 36 10 9 8 7 6 5 37 38 39 4 3 2 1 40 GND RESET_ IC101 25 24 23 22 21 20 19 18 17 16 26 27 28 29 ...

Page 50: ......

Page 51: ...ONTROL DISPLAY 15 14 13 12 11 WB WG WR VCLKX BLINK 7 CH 8 HORD 8 VERTD VSP HSP OSDENB SHADOW BSEN CONTROL FRAME WINDOWS LPN 9 DADDR 5 RCADDR VCLKS CWS BORDER LUMA GENERATOR BORDGER LUMINANCE CHARACTER ROM CRADDR DATA CHS CWS BLINK REGISTERS CONTROL VCLKX HDREN ARWDB HORD HSP 8 7 VERTD CHS CH VSP NROW VDREN HDREN 8 DATA ENCODER COLOUR HORIZONTAL VERTICAL ADMINISTRATOR ADDRESS BUS INTERFACE BLANK FB...

Page 52: ...RMAL GENERATOR FLYBACK HV GENERATOR 4 8 VSS VCC SCL SDA 6 5 WP 7 R W CONTROL SENSE AMP YDEC XDEC PAGE LATCHES 128X8 EEPROM ARRAY MEMORY LOGIC LOGIC CONTROL CONTROL I O IC102 24C04 LM2438 4 3 2 5 6 7 8 9 IC802 Vout 1 Vout 2 Vout 3 VCC GND Vin 3 Vin 2 VBB Vin 1 1 ...

Page 53: ...ST 1 35V SANDCASTLE SYNC BLUE DRIVE BLUE OUT GREEN DRIVE GREEN OUT VCC2 RED DRIVE RED OUT BLUE OSD IN GREEN OSD IN 11 12 13 14 15 16 17 18 19 20 A3 A3 A3 VID CONTRAST B CLAMP CAP BLUE VIDEO IN 10 9 8 G CLAMP CAP GROUND 7 6 GREEN VIDEO IN 5 gml gml gml R CLAMP CAP 4 1 2 RED OSD IN VCC RED VIDEO IN 3 A1 A1 A1 A2 A2 A2 ATTENUATOR ATTENUATOR ATTENUATOR 12dB DRIVE 12dB DRIVE 12dB DRIVE ATTENUATOR ATTEN...

Page 54: ...132 J033 J086 C121 FB050 FB905 FB907 FB903 FB402 FB403 FB904 FB405 FB101 FB906 SW901 C169 C104 C740 C400 C929 C419 C901 C416 C442 C440 C946 C604 9 1 H802 CONT SEN CLP 12V GND SDA SCL HS VS Q406 E C B C488 C720 B E C Q403 D902 D901 D904 D922 D903 D409 S G D Q431 S G D Q426 S G D Q428 J107 C964 C900 D707 C904 C133 C462 C912 C958 C990 C911 C712 C434 C101 C966 C925 C947 C437 C443 R121 J016 C940 C109 C...

Page 55: ... C866 C862 C872 C873 C841 C842 C843 C870 C861 C860 C834 C813 C836 C819 C865 C806 C814 C837 L801 L808 E C B Q832 E C B Q823 E C B Q831 E C B Q830 E C B Q822 E C B Q821 D810 FB804 R858 R807 R859 ZD801 ZD802 12 1 P801 SENSE SDA SCL VS HS GND B GND G GND R 5V 11 1 P804 FB ROGOBO GNDRD GDBDRBGBBB GND GND2 GND1 G2 C835 R831 R804 R818 R815 R819 R867 R891 R888 R816 R820 R817 R886 R887 R868 R866 R894 R895 ...

Page 56: ...02 SW602 R775 R199 CN903 Q905 Q903 C908 R907 R908 R909 R910 Q902 R906 R905 R902 LED Q402 D448 R912 R446 P15 J020 D104 D607 FOCUS1 ZD939 D410 Q931 R414 R408 A B R454 P13 D106 C160 C163 R186 J142 J143 C162 J075 C702 R148 C161 R198 C130 C174 R400 C400 R102 L400 C990 R919 R993 D990 Q990 R751 R739 R455 C720 C488 T403 R944 C743 H601 C742 Q741 R615 Q923 D912 R459 R735 D735 R734 IC104 R101 C750 R923 ZD430...

Page 57: ...0 R131 R133 R123 R111 P29 R136 JWT3 C173 R132 H804B L907 FB903 C145 C133 D134 R917 R134 C113 C112 C114 R172 R109 C929 D918 R108 R157 ZD901 R156 R124 C150 RA101 C140 R146 H804A R182 Q710 SW602 R775 R199 Q903 R907 R908 R909 LED D448 R912 P15 J020 D104 ZD939 Q931 A B P13 D106 C160 C163 R186 J142 J143 C162 J075 R148 C161 R198 C130 C174 R102 H601 Q923 D912 IC104 R101 C750 R923 ZD430 R992 R106 D107 C111...

Page 58: ... R886 R872 D808 D809 R870 H803 L810 L811 R887 R873 D842 R894 D840 R896 D841 P804 C862 C823 R868 R867 R866 R833 C843 Q823 R842 Q832 C842 Q822 R841 R832 C861 C860 R776 R616 D607 FOCUS1 R751 R739 C743 C742 Q741 R615 R612 C608 1N4148 63V 0 22 1 6KV 5600PF BF423 1 2W 180 1 2W 1 5 100K 1 2W 56K 22K 1 2W 56K UF2004 1 2W 56K 1N4148 680 N C 1 4W 1K 95A90 23 57A493 1 T 330 1N4148 11H 52T 93A64 1N5817 93A100...

Page 59: ...5 4 3 2 1 12 13 14 15 16 VSSA VCP RP VDDA HFLB SS SDA SCL VDD VFLB B G R VSS B B ROT OFF AD0 AD1 MUTE SKEYA SKEYB SENSE 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 31 32 33 34 10 9 8 7 V BLK AUDIO CS0 CS1 DEGAUSS W P ON XRAY Isense REGIN COMP HREF HFLY VCAP VOUT EWOUT HOUT GND BOUT VCC SCL VSYNCIN SDA H HVIN IC401 32 1 31 30 29 28 27 26 2 3 4 5 6 7 25 24 23 8 9 10 11 12 13 14 15 16...

Page 60: ...3 1 6KV 5600PF 1KV 4300 100V 4700 0 1 400V 0 43U 250V 0 1 100V 2 2U 1KV 100PF 1 2W 100K 1 1 4W 2K7 100K 3K9 1 18K 680 1 2W 180 1 2W 1 5 100K 1 2W 56K 22K 1 2W 56K UF2004 1 2W 56K 1N4148 680 N C 1 4W 1K 3W 0 5 1 2W 22 3W 22 1 4W 100 20K 100 3W 150 1 4W 47K 3W 56 3W 56 1 2W 1K 3K3 2W 100 1K 1 2W 10 10K 5K6 1K 95A90 23 95A90 23 57A493 1 T 330 1N4148 11H 52T 93A64 1 4W 220K 1N4148 93A64 11H 52T 1N4148...

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