NEC MultiSync 75F-3 Service Manual Download Page 76

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RED OSD INPUT

GREEN OSD INPUT

BLUE OSD INPUT

OSD INPUT SELECT

RED VIDEO IN

GREEN VIDEO IN

BLUE VIDEO IN

VIDEO CONTRAST

RED DRIVE ADJ.

GREEN DRIVE ADJ.

BLUE DRIVE ADJ.

RGB CUTOFF ADJ.

RED VIDEO OUT**

GREEN VIDEO OUT**

BLUE VIDEO OUT**

BLANK GATE

CLAMP GATE

OSD CONTRAST

POT6
100K

POT5
100K

POT4
100K

POT2
100K

POT1
100K

POT3
100K

R21 47k

R19

430

R20
2.4k

R17
2.4k

R16
2.4k

R18

430

R15

R17

100

R17

100

R10
50/75

R11
100k

R8
50/75

R5
50/75

*L1 is a Ferrite Bead

**50

Ω

Termination to

be Used at Outputs
TL/H/12355-12

C12
0.1

C11
0.1

C10
0.1

C8
0.1

C6
100

C7
0.1

C5
0.1

C13
0.1

C14
0.1

C15
0.1

C16
100

C17
0.1

C18
0.1

C19
0.1

C20
0.1

C21
0.1

C2
0.1

C1
100

= + 12V

LM1281

TOP VIEW

Test Circuits

FIGURE 2 LM1281 OSD Video Preamp Demonstration Board Schematic

Summary of Contents for MultiSync 75F-3

Page 1: ...MODELS MultiSync 75F 3 AccuSync 75F 3 N0701 3 COLOR MONITOR SERVICE MANUAL Better Service Better Reputation Better Profit MITSUBISHI NEC MITSUBISHI ELECTRIC VISUAL SYSTEMS ...

Page 2: ... use screwdriver that does not fit you may damage the screws W A R N I N G The SERVICE PERSONNEL should have the appropriate technical training knowledge and experience necessary to Be familiar with specialized test equipment and Be careful to follow all safety procedures associated with high voltage CRT circuit designs to minimize danger to themselves and their coworkers To avoid electrical chock...

Page 3: ...MENT TABLE 4 CONTROLS 5 ON SCREEN MANAGER OSM 6 SERIAL NUMBER INFORMATION 11 DISASSEMBLY 12 ADJUSTMENT PROCEDURES 13 WRITE AND INSPECTION FOR PLUG AND PLAY COMMUNICATION 26 TROUBLE SHOOTING 29 CIRCUIT DESCRIPTION 37 REPLACEMENT PARTS LIST 80 BLOCK DIAGRAMS 98 ...

Page 4: ...300 microamperes anode current To ensure continued X ray protection replace the CRT with only the same or equivalent type as the original and adjust the anode s voltage to the designated maximum rating never to exceed 1 1 2 Safety Checks Before returning the monitor to the user perform the following safety checks 1 Inspect to make certain that each lead dress is not pinched or that hardware is not...

Page 5: ...g An electrolytic capacitor installed with the wrong polarity might explode Caution Before performing servicing covered by this service manual read and follow the Safety Precau tions section of this manual Note If unforeseen conflict between the following servicing precautions and of the safety precautions always follow the safety precautions 1 Follow closely the servicing precautions printed on t...

Page 6: ...al and vertical frequencies only 640 480 60 to 120 Hz 800 600 55 to 110 Hz 832 624 55 to 106 Hz 1024 768 55 to 87 Hz 1152 870 55 to 77 Hz 1280 1024 55 to 66 Hz Some systems may not support all modes listed NEC Mitsubishi Electronics Display cites recommended resolution at 85 Hz for optimal display performance Active Display Area Factory Setting Horizontal Vertical 310 mm 12 2 inches 232 mm 9 1 inc...

Page 7: ...GNMENT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PIN NO Mini D SUB 15P 1 RED 2 GREEN 3 BLUE 4 GROUND 5 GROUND 6 RED GROUND 7 GREEN GROUND 8 BLUE GROUND 9 5V in 10 GROUND 11 GROUND 12 SDA 13 H SYNC 14 V SYNC 15 SCL 4 ...

Page 8: ... contrast With OSM Select icon and adjust RESET Return the adjustment item to the factory setting Power indicator LED The LED indicate Power management state POWER SWITCH Push push to turn the monitor on and off Power input To connect with the power cord Signal input with the captive cable To connect with personal computers analogue RGB output 5 ...

Page 9: ...to select icon right or left and the selected icon display red color If selected icon is DAC out press SELECT key will display DAC value bar fig 2 User can press UP key or DOWN key to adjust DAC value Press SELECT key to close DAV value bar and UP key or DOWN key to select the other icon l SPECIAL FUNCTION OPERATION 1 Degauss Active If selected icon is degauss icon press SELECT key to activate deg...

Page 10: ...hange OSD color there are three kinds of OSD color can be selected Fig 8 10 Background white blue black Action icon red red red Normal icon black white white Value bar blue yellow green 4 SYNC OSD Display If EXIT icon is selected press SELECT key to close OSD menu and then display sync information for 2 sec This sync information will not be close until release SELECT key Fig 11 Fig 4 Fig 5 Fig 6 F...

Page 11: ...ory area b R G B value are saved to current color temperature P2 Self Test Pattern Select P1 Full White Pattern P2 Cross Hatch Pattern NP No Pattern Power Saving SS Sub Size Do not adjust OSD Position H OSD Position V VL Vertical Linearity IN OUT VB Vertical Linearity Balance Top Bottom HM Horizontal Moire Minimum VM Vertical Moire Minimum HC Side Pin Corner HF Horizontal Dynamic Focus Min VF Vert...

Page 12: ...ust the green contrast of the display B Blue Color Control Adjust the blue contrast of the display Horizontal position Moves the image horizontally left or right Vertical position Moves the image vertically up or down Horizontal size Decreases or increases the horizontal size of the image Vertical size Decreases or increases the vertical size of the image The Geometry controls allow you to adjust ...

Page 13: ...the Color Temperature icon on Icon Select Window and push SELECT button OSD There are 3 background colors Blue Black and white These can be selected by SELECT button after the selection of OSM on Icon select window exit EXIT To exit the OSM window Select EXIT on Icon select window then push SELECT button Note If you do not push buttons within 10 seconds in OSD condition the window will automatical...

Page 14: ...low Ex SERIAL NUMBER LABEL Manufactured Year Last digit Manufactured Month January to September 1 to 9 October X November Y December Z Factory mark NPG CHINA Y MODEL MS75F AS75F SERIAL No 00001 on ward Start from 00001 when month is changed Control Code J 1 Y 1 X 0 0 0 0 11 ...

Page 15: ...k and lightly hit part figure 1 reference of a top of the cabinet back and remove the cabinet back 1 Unsolder the GND wire from MAIN BOARD ASSY 2 Disconnect the connector P201 P202 S204 and S205 from the CRT BOARD ASSY 3 Disconnect the CRT BOARD ASSY from the CRT 4 Disconnect the connector S301 and P102 from the MAIN BOARD ASSY 5 Remove the Anode Cap from the CRT NOTE Carefully discharge the CRT a...

Page 16: ...B Cut Off Adjustment 16 C White Balance Adjustment Factory Auto Adjustment 16 D sRGB MODE White Balance Adjustment 16 11 Convergence Adjust 16 12 Power Saving Function Inspection 16 13 Geometry Adjustment 17 14 DDC 1 2B Writing and Inspection 17 15 Setting Before Shipment 18 16 Adjustment Magnetic Field 18 17 Timing Sheet 19 Reference Distortion Adjustment 23 Inspection of PnP communication and Wr...

Page 17: ...peration A Factory Mode SELECT Key UP Key if pressed when the power SW on OSD Position Control Mode is in Factory Mode Menu B Auto Alignment mode and DDC 2B Writing Inspection Mode Down Key if pressed when the power SW on MODE RESOLUTION H SYNC EREQ V SYNC FREQ H POLARITY V POLARITY 1 VGA350 31 5KHz 70Hz 2 VGA400 31 5kHz 70Hz 3 VGA480 31 5KHz 60Hz 4 MAC º 35K 35 0KHz 66Hz 5 800 600 56 35 2KHz 56Hz...

Page 18: ...nd TP2 then power on Monitor should be active in X Ray protector 7 H V Confirmation A Mode No 12 B Pattern Full Black Brightness just cut off C Check the high voltage is 25 5 0 5kV 8 H Raster Center Adjustment A Mode No 18 B Pattern Crosshatch Reverse C Adjust the Brightness Control that the background can be visible D Change VR301 to make the back ground should be center off the CRT 9 Pre Adjustm...

Page 19: ...st Control set to Max Adjust G gain control to Y 42FL 144 cd m2 2 Change Pattern to Full White Brightness control set to Min 3 Adjust R gain control B gain control to X 300 Y 315 at the contrast control is adjusted 15FL 52cd m2 3 Maximum Brightness Adjustment for 9300K and 7500K mode 1 Select 9300K mode 2 Brightness control set to Max Contrast control set to Max 3 Adjust AB in Factory mode to Y 31...

Page 20: ...Read Write System C Scan bar code label and apply serial NO to EDID Data 17 EDID data Table AS75F 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF FF 00 38 A3 CF 5D 01 01 01 01 10 0A 0A 01 03 0C 21 18 78 EA 57 98 A4 52 46 97 24 20 11 48 4C FF EE 00 31 59 45 59 61 59 71 4A 81 40 30 01 01 01 01 01 01 EA 24 00 60 41 00 28 30 30 60 40 13 00 36 E8 10 00 00 1E 00 00 00 FD 00 37 78 1F 50 46 0B 00 0A ...

Page 21: ...Center of the screen Contrast Maximum Brightness Preset H V moire cancel function Minimum Self test pattern Cross Hatch Pattern for 1 munites if the Signal Cable is not connected Select the P2 in the Factory Mode 16 Adjustment Magnetic Field Vertical 40uT Horizontal 0uT Neutral 18 ...

Page 22: ...S 3 18 3 81 3 81 2 12 2 00 3 92 Back dot 48 48 48 96 128 56 uS 1 91 1 91 1 91 3 17 3 56 1 25 Total H 449 449 525 525 625 408 5 m S 14 268 14 268 16 683 15 000 17 778 11 500 Disp H 350 400 480 480 600 384 m S 11 122 12 711 15 253 13 714 17 067 10 810 Front H 37 12 10 3 1 0 m S 1 176 0 381 0 318 0 086 0 028 0 000 S ync Pulse H 2 2 2 3 2 4 m S 0 064 0 064 0 064 0 086 0 057 0 113 Back H 60 35 33 39 22...

Page 23: ...dot 64 40 128 56 80 136 uS 2 03 1 27 3 20 1 56 1 62 2 09 Back dot 120 128 88 80 160 160 uS 3 81 4 06 2 20 2 22 3 23 2 46 Total H 500 450 628 509 625 806 m S 13 333 11 886 16 579 11 76 13 333 16 666 Disp H 480 400 600 480 600 768 m S 12 800 10 565 15 840 11 093 12 800 15 880 Front H 1 9 1 1 1 3 m S 0 027 0 238 0 026 0 023 0 021 0 062 S ync Pulse H 3 3 4 3 3 6 m S 0 080 0 079 0 106 0 069 0 064 0 124...

Page 24: ... 0 20 0 582 0 44 S ync Pulse dot 64 64 136 96 96 112 uS 1 12 1 14 1 81 1 22 1 745 1 04 Back dot 224 152 144 176 96 248 uS 3 91 2 70 1 92 2 23 1 745 2 30 Total H 667 631 806 800 530 1066 m S 13 413 11 756 14 272 13 328 8 325 16 661 Disp H 624 600 768 768 480 1024 m S 12 548 11 179 13 599 12 795 7 540 16 005 Front H 1 1 3 1 8 1 m S 0 020 0 019 0 053 0 017 0 126 0 016 S ync Pulse H 3 3 6 3 6 3 m S 0 ...

Page 25: ...S 11 852 10 836 Front dot 40 48 uS 0 593 0 508 S ync Pulse dot 80 96 uS 1 185 1 016 Back dot 136 208 uS 2 015 2 201 Total H 639 808 m S 9 997 11 765 Disp H 600 768 m S 9 386 11 183 Front H 3 1 m S 0 047 0 015 S ync Pulse H 4 3 m S 0 063 0 044 Back H 32 36 m S 0 501 0 524 Interlace NON NON Polarity H V POS POS POS POS C om posite S ync C om posite Video C haracter Font 7 9 7 9 Serration OFF OFF EQ ...

Page 26: ...oss hatch 2 When OSM MENU is displayed Select the icon 3 Make sure that the picture tilt meets the following standards X 1 0m m X X 2 Pincushion Balance Adjustment 1 When OSM MENU is displayed Select the icon 2 Make sure that the Pincushion Balance meets the following standards A B A B 0 5mm 3 Parallelogram distortion Adjustment 1 When OSM MENU is displayed Select the icon 2 Adjust SW so that the ...

Page 27: ...t the trapezoid distortion meets the following standards AB CD 2mm AC BD 2mm B D A C 6 Preset Picture Size and Position Adjustment Factory Mode Setting Signal All Signals Cross hatch Perform the Preset Picture Size and Position Adjustment for above all signal 1 When OSM MENU is displayed Select the icon 2 Adjust the picture size and position as listed below by SW Picture size H 310 2mm V 232 2mm P...

Page 28: ...ce error Calculate by CH CV 1 Receive signal 14 Cross hatch pattern 2 Measure convergence error If it is out of spec adjust static convergence by 4 pole magnets and 6 pole magnets C H C V A B 310mm 232mm A Zone A circle 232 mm in the center of the CRT face center CH CV Within 0 35 mm CS No rule B Zone Areas outside of zone A within the rectangle of 310 mm 232 mm Safety with the list below C H 0 35...

Page 29: ... to PC without Printer Cable 2 EDID Write and Inspection Method 1 Run specified EDID write and Inspection program on PC DOS mode The monitor turns into the self test mode 2 Run the specified EDID write and inspection program under PC DOS mode 3 Key in the serial No or Scan serial No bar code 4 Press Return key to write the EDID data 5 Press F1 key to inspect DDC1 communication 6 Press F2 key to in...

Page 30: ... 57 98 A4 52 46 97 24 20 11 48 4C FF EE 00 31 59 45 59 61 59 71 4A 81 40 30 01 01 01 01 01 01 EA 24 00 60 41 00 28 30 30 60 40 13 00 36 E8 10 00 00 1E 00 00 00 FD 00 37 78 1F 50 46 0B 00 0A 20 20 20 20 20 20 00 00 00 FC 00 4D 60 75 6C 74 69 53 79 6E 63 20 37 35 46 00 00 00 FF 70 00 30 33 30 30 30 30 31 59 41 0A 20 20 20 00 B5 Serial No Area 9bytes Check Sum AccuSync 75F Week of Manufacture Month 4...

Page 31: ...ct Revision code start from J EDID Code Input Procedure ex 1 Scan Bar code 20 digits NB70215L_ 1X00001YJ 2 Skip 11 digits then find the Serial No 1X00001YJ 3 Make Year hex Code from Year digit 1 à 0Bh 4 Make Week hex Code from Month digit 10 4 40 à 28h 5 Change Serial No to ASCII code 31h 58h 30h 30h 30h 30h 31h 59h 4Ah 6 Apply Serial No Information to the default EDID code 7 Download EDID from PC...

Page 32: ...rouble shooting section before using this chart TABLE OF CONTENTS Page 1 NO OPERATION POWER LED FLASH 30 2 NO OPERATION POWER LED OFF 31 3 VIDEO NOISE OUT OF SYNC 32 4 NO VIDEO 33 5 NO RASTER 34 6 TROUBLE IN H V SYNC 35 7 PINCUSHION POOR 36 29 ...

Page 33: ...330 NEGATIVE CONNECT TO U302 pin 7 2 SCOPE SET AT 10V DIV 10US DIV PROBE CONNECT TO Q319 GATE AND U302pin 6 POWER LED FLASH CHECK U302 U302 PIN6 PULSE O P POWER SW TURN OFF FAILURE U302 Q106 CHECK U302 PIN 10 VCC PIN 4 SAWTOOTH PIN 8 5V NO POWER SW TURN OFF MULTIMETER TEST Q307 U302 D110 D111 D112 D113 30 ...

Page 34: ...A POSITIVE CONNECT TO C109 NEGATIVE CONNECT TO C105 2 SCOPE SET AT 10V DIV 10US DIV PROBE CONNECT TO Q101 GATE AND C105 POWER SW TURN OFF CHECK F101 CHECK Q101 CHECK U101 U101 PIN6 PULSE O P POWER SW TURN ON FAILURE R114 R120 ZD101 CHECK U101 PIN 7 VCC PIN 4 SAWTOOTH PIN 8 5V NO 31 ...

Page 35: ...FREQUENCY C114 TO GND CHECK Q319 G S FREQUENCY SYNCRONIZE WITH H SYNC CHECK HORIZONTAL FREQUENCY C359 TO GND CHECK R30X FBT PIN6 NORMAL OPERATION CHECK Q101 G S FREQUENCY SYNCRONIZE WITH H SYNC CHECK C114 R116 D109 R115 R117 YES YES NO NO NO NO 32 ...

Page 36: ... U201 PIN 18 20 23 SIGNAL LEVEL PROBLEM IN U201 CLAMP PIN 15 U201 12V VOLTAGE YES CHECK U203 PIN 1 3 5 SIGNAL LEVEL CHECK CATHODE VIDEO LEVEL PROBLEM IN CRT YES YES PROBLEM IN R220 R240 R260 NO PROBLEM IN U203 12V 77V VOLTAGE NO NO TROUBLE IN R G B SIGNAL SIGNAL CABLE NO REFER TO NO RASTER ON PAGE NO 33 ...

Page 37: ... 56V 68V AT H FREQ 31 5KHz PROBLEM IN MCU U701 PROBLEM IN U701 U302 PROBLEM IN U302 Q319 D335 L304 OR DEFLECTION YOKE PROBLEM IN Q307 Q308 T302 D307 D308 CHECK Q307 COLLECTOR ABOUT 1050Vp p CHECK G1 VOLTAGE ABOUT 45 65V PROBLEM IN Q305 Q306 ZD303 D318 T301 C344 PROBLEM IN G2 VOLTAGE YES YES YES YES YES YES YES NO NO NO NO NO NO 34 ...

Page 38: ...CK U701 PIN 40 39 H V SYNC SIGNAL PROBLEM IN H V SYNC LINE Q301 Q401 CHECK U701 PIN 32 33 H V SYNC SIGNAL CHECK U701 PIN 5 VOLTAGE 5V CHECK U302 PIN 14 15 CHECK U701 PIN 8 FREQ 8MHz PROBLEM IN U302 PROBLEM IN U701 PROBLEM IN U203 12V 77V VOLTAGE PROBLEM IN 5V LINE YES NO YES YES YES YES YES YES NO NO NO NO NO 35 ...

Page 39: ... POOR PINCUSHION POOR PINCUSHION PARABOLA WAVE CHECK U302 PIN 11 PARABOLA CHECK U302 PIN 14 SYNC INPUT CHECK U701 PIN 32 OUTPUT CHECK R390 U301 CHECK 12V U302 CHECK U301 Q316 Q318 NO NO NO YES YES YES 36 ...

Page 40: ...n signal processing Vertical and geometrical compensation of the raster 57 4 Horizontal drive and power supply output 69 5 Horizontal amplitude control 70 6 Blanking and spot killer 71 7 Video amplifier system with on screen display 72 8 Monolithic triple 13 5nS CRT driver 74 9 On screen display 78 37 ...

Page 41: ...n the other electronic equipment AC rectifier and smoothing capacitor The AC input is rectified by means of the full bridge rectifier that consists of the diodes D101 to D104 The AC voltage is converted into the DC voltage by passing through the next stage that consists of the smoothing capacitor C105 TH101 is a NTC thermistor for the power supply at the in rush current limit Degaussing circuit Th...

Page 42: ...103 and diode D131 and resistor R169 and zener diode ZD101 are for the starting operation When the circuit starts its operation the power supply transformer T101 supplies the auxiliary 12 Volt power to the control IC chip U101 via pins 6 and 7 of the winding transformer T101 5 Synchronization circuit The synchronization signal is induced from the fly back transformer FBT and carries out the syn ch...

Page 43: ... volts and since the set up voltage is variable from 62 volts to 160 volts it is variable depending on the horizontal synchronism The frequency band is variable from 31 kHz to 69 kHz The voltage is fed back from the fly back transformer FBT The DC DC output voltage is used as high voltage input of FBT T301 1 DC DC is a step up circuit and consists mainly of the choke L304 the transistor Q319 the d...

Page 44: ...put 2 pins for A D key input SELECT UP DOWN and RECALL 3 Burn in ID input 1 pins for Burn in ID input 4 Reset input low pulse for reset MCU 5 Crystal input 2 pins using 8MHz crystal Output MCU digital pin 1 Degauss Active high pulse for 2 5 sec when in degauss MCU will activate degauss while power on 2 CS output 3 pins CS2 CS1 CS0 for CS control H sync CS2 CS1 CS0 H sync 33 25KHz 0 0 0 33 25KHz H ...

Page 45: ...se H size V center V size Pincushion Trapezoid Rotation Parallel Pin balance R gain G gain and B gain DAC value 255 means the maximum output volts except Parallel PWM All D A except Rotation Brightness Contrast R gain G gain B gain are mode dependent functions Parallel is voltage inverter function 6 Sync output 2 pins for H sync and V sync negative output normal high 7 DDC 2 pins DDC SDA DDC SCL f...

Page 46: ...35k 35 0KHz 66Hz 5 800 600 56 35 2KHz 56Hz 6 8514A 35 5KHz 87Hz 7 640 480 75 37 5KHz 75Hz 8 EVGA 400 37 8KHz 84Hz 9 800 600 60 37 8KHz 60Hz 10 640 480 85 43 3KHz 85Hz 11 800 600 75 46 8KHz 75Hz 12 1024 768 60 48 3KHz 60Hz 13 MACII 49k 49 7KHz 74Hz 14 800 600 85 53 6KHz 85Hz 15 1024 768 70 56 4KHz 70Hz 16 1024 768 75 60 0KHz 75Hz 17 640 480 120 63 7KHz 120Hz 18 1280 1024 60 64 0KHz 60Hz 19 800 600 ...

Page 47: ...ignal processor with H V separation H V frequency counter H V polarity detection control and clamp pulse output Six free running sync signal outputs Horizontal frequency up to 106kHz Self test pattern DDC1 2B supported Fast mode master slave I C interface up to 400kHz Embedded USB function with endpoint 0 and endpoint 1 Built in 3 3V regulator for USB tranceiver Watch dog timer Maximum 28 programm...

Page 48: ... PWM6 PD2 PWM7 PD0 VOUT PA6 PWM12 PA4 PWM10 PA3 PWM9 PA2 PWM8 PA1 SCL1 PC0 AD0 PC2 AD2 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 40 pin PDIP PWM0 D PWM2 PWM1 RESET 3V3 VDD GND OSCO OSCI PB5 SDA2 PB4 SCL2 PB3 PAT PB2 PB1 HFI PB0 HFO IRQ PC7 SOGIN PC6 WT62P1 S44 44 pin SOP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 PA1 SCL1 PA6 PWM12 PD0 VOUT PD2 PWM7 D VIN HIN PWM3 PD5 PWM4 P...

Page 49: ... 18 17 17 PC6 I O Port C6 20 19 18 18 PC5 I O Port C5 21 20 19 19 PC4 I O Port C4 22 21 20 20 PC3 AD3 I O Port C3 or ADC input 3 23 22 21 21 PC2 AD2 I O Port C2 or ADC input 2 24 23 22 22 PC1 AD1 I O Port C1 or ADC input 1 25 24 23 23 PC0 AD0 I O Port C0 or ADC input 0 26 25 24 24 PA0 SDA1 I O Port A0 or DDC interface SDA pin 27 26 25 25 PA1 SCL1 I O Port A1 or DDC interface SCL pin 28 27 26 26 PA...

Page 50: ...dually to emulate different RAM size IC see Register 0FFFh ROM 32768 bytes flash memory for program Address is located from 8000h to FFFFh The following addresses are reserved for special purpose FFFAh low byte and FFFBh high byte INT0 interrupt vector FFFCh low byte and FFFDh high byte program reset interrupt vector FFFEh low byte and FFFFh high byte INT1 interrupt vector System Reset There are f...

Page 51: ...Voltage Reset When VDD is below 3 9V an internal reset signal is generated The reset signal will last 2 048 ms after the voltage is higher than 3 9V Watchdog Timer Reset If a time out happens when watchdog timer is enabled a reset pulse is generated Please refer watchdog timer section for more information RESET 3V3 Watchdog Timer Reset Low VDD Reset Illegal Address Reset 2 048ms Timer LATCH CPU Pe...

Page 52: ...A0 Pin PA2 to PA6 are shared with PWM output When corresponding EPWMx bit is 0 the pin is I O port If PAxOE bit is set it is a push pull type output If PAxOE bit is cleared it is an input pin with internal pull up resistor Pin PA7 is shared with PWM13 output and clamp pulse output When both EPWM13 bit and ENCLP bit are 0 this pin becomes I O port If PA7OE bit is set it is a push pull type output I...

Page 53: ...rity is positive HINPOL 1 If the result of sampling is high and lasts 192 256us with no change the polarity is negative HINPOL 0 Vertical Polarity Detect Vertical polarity is detected by sampling VIN level at 2 048ms after rising edge of VIN If the level is low the polarity is positive VINPOL 1 If the level is high the polarity is negative VINPOL 0 But if SEPART bit is set the VINPOL bit is 1 beca...

Page 54: ...ed by 2us pulse during Vsync pulse The composite sync signal separator can handle H V and H exclusive OR V signals Fig 5 shows the timig relationship of the extracted H and V sync signals If Hsync output do not want to insert pseudo H pulses EXTRHS signal during Vsync pulse set BYPASS bit can let HOUT pin output waveform same as Hsync input Note polarity can be controlled by HOPOL bit Fig 6 Timing...

Page 55: ...31 75us 20 833us 15 667us 12 333us 11us 9 417us TVT Ver total time 16 669ms 13 875ms 16 7ms 15 417ms 11 792ms 11 771ms THS H sync time 3 833us 2 417us 1us 1 083us 1us 0 833us THB H Back porch H Left border 2 us 1 417us 2 417us 1 833us 1 583us 1 417us THF H Front porch H Right border 0 708us 1 125us 0 542us 0 375us 0 375us 0 292us TVS V sync time 2 THT 6 THT 3 THT 3 THT 3 THT 3 THT TVB V Back porch...

Page 56: ...DDC Flow Chart 53 ...

Page 57: ...Master I C Flow Chart 54 ...

Page 58: ...Master I C restart mode Flow Chart 55 ...

Page 59: ...Slave I C Flow Chart 56 ...

Page 60: ...on grid 1 of picture tube Horizontal section I C bus controllable wide range linear picture position pin unbalance and parallelogram correction via horizontal phase Frequency locked loop for smooth catching of horizontal frequency Simple frequency preset of fmin and fmax by external resistors Low jitter Soft start for horizontal and B control drive signals Vertical section I C bus controllable ver...

Page 61: ...BLOCK DIAGRAM I C bus autosync deflection controller for PC monitors TDA4857 58 ...

Page 62: ...al synchronization unlock protection vertical blanking output SCL 18 I C bus clock input SDA 19 I C bus data input output ASCOR 20 output for asymmetric EW corrections VSMOD 21 input for EHT compensation via vertical size VAGC 22 external capacitor for vertical amplitude control VREF 23 external resistor for vertical oscillator VCAP 24 external capacitor for vertical oscillator SGND 25 signal grou...

Page 63: ...l sync integrator and sync normalizer are disjuncted before they are fed to the vertical oscillator Video clamping vertical blanking generator The video clamping vertical blanking signal at CLBL pin 16 is a two level sandcastle pulse which is especially suit able for video ICs such as the TDA488x family but also for direct applications in video output stages The upper level is the video clamping p...

Page 64: ...if a pro tection condition is true All this can be detected by the microcontroller if a pull up resistor is connected to its own supply voltage For an additional fast vertical blanking at grid 1 of the pic ture tube a 1 V signal referenced to ground is available at this output The continuous protection blanking see Sec tion Video clamping vertical blanking generator is also available at this pin H...

Page 65: ...he phase of the HDRV pin 8 output pulse An external modulation of the PLL2 phase is not allowed because this would disturb the pre correction of the hori zontal focus parabola Soft start and standby If HPLL2 is pulled to ground either by an external DC cur rent or by resetting register SOFTST the horizontal output pulses and B control driver pulses will be inhibited This means that HDRV pin 8 and ...

Page 66: ...d be at least 10 lower than the minimum trigger frequency The contributions shown in Table 2 canbe assumed 63 I C bus autosync deflection controller for PC monitors TDA4857 Contributing elements Minimum frequency offset between ffr v and lowest trigger frequency 10 Spread of IC 3 Spread of RVREF 1 Spread of CVCAP 5 Total 19 Result for 50 to 160Hz application Hz 42 1 19 Hz 50 fr V f The AGC of the ...

Page 67: ...pezium correction EWDRV pin 11 provides a complete EW drive waveform The components horizontal pincushion horizontal size corner correction and trapezium correction are controlled by the registers HPIN HSIZE HCORT HCORB and HTRAP The corner correction can be adjusted separately for the top HCORT and bottom HCORB part of the picture The pincushion EW parabola amplitude corner and tra pezium correct...

Page 68: ...CUS pin 32 This section generates a complete drive signal for dynamic focus applications The amplitude of the horizontal parabola is internally stabilized thus it is independent of the horizon tal frequency The amplitude can be adjusted via register HFOCUS Changing horizontal size may require a correc tion of HFOCUS To compensate for the delay in external focus amplifiers a pre correction for the ...

Page 69: ...ge sequence and resets the flip flop When the voltage at BSENS reaches the threshold voltage VRESTART BSENS the discharge circuit will be disabled au tomatically and the flip flop will be set immediately This behaviour allows a definition of the maximum duty cycle of the B control drive pulse by the relationship of charge current to discharge current Supply voltage stabilizer references start up p...

Page 70: ...subaddress an acknowledge is not given after the data This indicates that only in soft start mode data can be stored into normal registers If the supply voltage dips under 8 1 V the TDA4857 leaves normal operation mode and changes into standby mode The microcontroller can check this state by sending data into a register with the subaddress 0XH The acknowledge will only be given on the data if the ...

Page 71: ...I C bus autosync deflection controller for PC monitors TDA4857 68 APPLICATION INFORMATION ...

Page 72: ...erates a horizontal output through the driving signal IB1 ICPMAX Q1hfeMIN IB2 Ü Ü Ü Ü Ü3IB1 di dt Ü Ü Ü Ü Ü3 3 A US 2 The resistor R2 corrects the current IB1 the resistor R3 works as a damping resistor and leak resistor and the diode D2 works as a discharging device and polar body As long as the transistor Q1 is OFF the discharge is accelerated and the storage time Tstg is shortened 3 H OUT circu...

Page 73: ...c ly Inversely the horizontal width decreases when Vm Vcs ly B Vp 2Tr π Ts Tr Ô Ô Ô Ô ÔLyCt Tm Ô Ô Ô Ô ÔLmCm 2 Q2 Q3 and U1 compose the control circuit of H WIDTH Of those devices the transistor Q2 and Q3 compose the Darlington current amplifier and on the other operational amplifier U1 compose the emitter coupled circuit that stabilize the voltage and control the current 3 The horizontal width br...

Page 74: ...tical blanking amplifier of the Q1 the output connected to buffer Q2 through C3 coupling to G1 control circuit D4 D5 for over voltage protect 3 The Q6 is spot killer protect circuit in normal power on stage V1 V2 and ZD1 so Q6 off The CRT G1 voltage is fixed at 45 67VDC with vertical blanking pulse 12Vpp VG1 V R11 R10 R11 V V1 V3 When power off the voltage V1 V2 then Q6 turn on pulling VG1 to 180V...

Page 75: ...input bandwidth 50 MHz High speed video OSD changeover High impedance DC contrast control above the 0 4V 40dB range High impedance DC OSD contrast control above the 0 4V 40dB range BLOCK AND CONNECTION DIAGRAM Description of the functions Figure 1 shows the block diagram of LM1281 in conformity with the pin layout of the IC Every channel accepts both the video signal and the OSD signal at the inpu...

Page 76: ...4k R16 2 4k R18 430 430 R15 R17 100 R17 100 R9 33 R10 50 75 R11 100k R8 50 75 R7 33 R5 50 75 R6 R4 R3 R2 R1 L1 is a Ferrite Bead 50Ω Termination to be Used at Outputs TL H 12355 12 C12 0 1µF C11 0 1µF C10 0 1µF C8 0 1µF VCC C9 10µF C6 100µF C7 0 1µF C4 C5 0 1µF C3 J1 C13 0 1µF C14 0 1µF C15 0 1µF C16 100µF C17 0 1µF C18 0 1µF C19 0 1µF C20 0 1µF C21 0 1µF C2 0 1µF C1 100µF VCC 12V LM1281 TOP VIEW ...

Page 77: ...74 8 Monolithic triple 13 5nS CRT driver ...

Page 78: ...75 ...

Page 79: ...76 ...

Page 80: ...77 ...

Page 81: ...acter color selection Maximum 8 color selectable per display row Double character height and or width control Programmable positioning for display screen center Bordering and shadowing effect for display Programmable vertical character height 18 to 71 lines for multi sync operation 4 programmable background windows with multi level windowing effect Software clear function for display frame buffer ...

Page 82: ...the SPI bus is enabled SDA I 7 Serial data input The external data transfer through this pin to internal display registers and control registers It has an internal 100 kΩ pull up resistor SCK I 8 Serial clock input The clock input pin is used to synchronize the data transfer It has an internal 100 kΩ pull up resistor VDD 9 Digital power supply Positive 5 V DC supply for internal digital circuitry ...

Page 83: ...0001651 POWER CORD 3P 1 8M EUROPE CABLE 80012051 SIGNAL CABLE 20276 1 5M FOR PC 5V TH101 80000801 THERMISTOR NTCR SCK054 13 3mm TH102 80005821 THERMISTOR PTCR 4 5ohm X701 EM012004 X TAL 49U 12MHz SYMBOL PART NO DESCRIPTION CRT TUNER CRT 80013331 CRT 17 ORION M41QEC200X021 ICS U702 80009941 ATMEL E ROM AT24C08B U101 DD002600 IC LINEAR KA3842A 8P U201 80000631 IC LM1281 U103 80000321 IC PHOTO COUBLE...

Page 84: ...ARBON 1 8W T 5 68Kohm R201 FA040680 CARBON 1 8W T 5 68ohm R113 R382 FA040752 CARBON 1 8W T 5 7 5Kohm R212 R232 R252 FA040750 CARBON 1 8W T 5 75ohm R336 FA040822 CARBON 1 8W T 5 8 2Kohm R284 FA040821 CARBON 1 8W T 5 820ohm R150 R157 R175 80002031 FUSEABLE RES 1 2W A M 0 22ohm R297 FB910229 FUSIBLE MF RES 1 4W 2 2ohm J R31Q FB241181 METAL 1 4W T 1 1 18Kohm R31U FB241202 METAL 1 4W T 1 12Kohm R389 FB...

Page 85: ...F CAP BOX 0 0015u 50V J C315 GF210252 MEF CAP BOX 0 001u 50V J C115 GF233262 MEF CAP BOX 0 0033u 63V J C366 GF256252 MEF CAP BOX 0 0056u 50V J C362 GF282252 MEF CAP BOX 0 0082u 50V J C365 GF210352 MEF CAP BOX 0 01u 50V J SYMBOL PART NO DESCRIPTION C360 GF215452 MEF CAP BOX 0 15u 50V J C314 GF210452 MEF CAP BOX 0 1u 50V J C114 GF210462 MEF CAP BOX 0 1u 63V J C403 GF222452 MEF CAP BOX 0 22u 50V J C3...

Page 86: ...9281 17 N0701F FBT T302 80000281 H DRIVE X FM 4 5mH EI 19 T303 80015651 N0701F D F X FM EI 19 1 10 T101 80011211 POWER X FM ERL35 500uH FE700 VARIABLE RESISTORS VR101 FF300201 VR CARBON 6mm ß 200 ohm B VR210 VR230 VR250 FF300203 VR CARBON 6mm ß 20K B VR307 FF310104 VR CARBON 6mm ª 100K RELAYS SWITCHES RL101 80003751 RELAY 12V 6PGSA SS 212DM GOOD SKY RL301 80010001 RELAY RUDH SH 112D400ohm GOOD SKY...

Page 87: ...ohm R319 FA040124 CARBON 1 8W T 5 120Kohm R201 FA040680 CARBON 1 8W T 5 68ohm R113 R382 FA040752 CARBON 1 8W T 5 7 5Kohm R212 R232 R252 FA040750 CARBON 1 8W T 5 75ohm R336 FA040822 CARBON 1 8W T 5 8 2Kohm R284 FA040821 CARBON 1 8W T 5 820ohm R150 R157 R175 80002031 FUSEABLE RES 1 2W A M 0 22ohm R297 FB910229 FUSIBLE MF RES 1 4W 2 2ohm J R31Q FB241181 METAL 1 4W T 1 1 18Kohm R31U FB241202 METAL 1 4...

Page 88: ...F CAP BOX 0 0015u 50V J C315 GF210252 MEF CAP BOX 0 001u 50V J C115 GF233262 MEF CAP BOX 0 0033u 63V J C366 GF256252 MEF CAP BOX 0 0056u 50V J C362 GF282252 MEF CAP BOX 0 0082u 50V J C365 GF210352 MEF CAP BOX 0 01u 50V J SYMBOL PART NO DESCRIPTION C360 GF215452 MEF CAP BOX 0 15u 50V J C314 GF210452 MEF CAP BOX 0 1u 50V J C114 GF210462 MEF CAP BOX 0 1u 63V J C403 GF222452 MEF CAP BOX 0 22u 50V J C3...

Page 89: ...MERS T301 80009281 17 N0701F FBT T302 80000281 H DRIVE X FM 4 5mH EI 19 T303 80013361 N1701F D F X FM EI 19 1 9 T101 80011211 POWER X FM ERL35 500uH FE700 VARIABLE RESISTORS VR101 FF300201 VR CARBON 6mm ß 200 ohm B VR210 VR230 VR250 FF300203 VR CARBON 6mm ß 20K B VR307 FF310104 VR CARBON 6mm ª 100K RELAYS SWITCHES RL101 80003751 RELAY 12V 6P GSA SS 212DM GOOD SKY RL301 80010001 RELAY RUDH SH 112D4...

Page 90: ...23 CARBON 1 8W T 5 62Kohm R319 FA040683 CARBON 1 8W T 5 68Kohm R201 FA040680 CARBON 1 8W T 5 68ohm R113 R382 FA040752 CARBON 1 8W T 5 7 5Kohm R212 R232 R252 FA040750 CARBON 1 8W T 5 75ohm R284 FA040821 CARBON 1 8W T 5 820ohm R150 R157 R175 80002031 FUSEABLE RES 1 2W A M 0 22ohm R297 FB910229 FUSIBLE MF RES 1 4W 2 2ohm J R31Q FB241181 METAL 1 4W T 1 1 18Kohm R31U FB241202 METAL 1 4W T 1 12Kohm R389...

Page 91: ...F CAP BOX 0 0015u 50V J C315 GF210252 MEF CAP BOX 0 001u 50V J C115 GF233262 MEF CAP BOX 0 0033u 63V J C366 GF256252 MEF CAP BOX 0 0056u 50V J C362 GF282252 MEF CAP BOX 0 0082u 50V J C365 GF210352 MEF CAP BOX 0 01u 50V J SYMBOL PART NO DESCRIPTION C360 GF215452 MEF CAP BOX 0 15u 50V J C314 GF210452 MEF CAP BOX 0 1u 50V J C114 GF210462 MEF CAP BOX 0 1u 63V J C403 GF222452 MEF CAP BOX 0 22u 50V J C3...

Page 92: ...02 80000281 H DRIVE X FM 4 5mH EI 19 T303 80013361 N1701F D F X FM EI 19 1 9 T101 80011211 POWER X FM ERL35 500uH FE700 VARIABLE RESISTORS VR101 FF300201 VR CARBON 6mm ß 200 ohm B VR210 VR230 VR250 FF300203 VR CARBON 6mm ß 20K B VR307 FF310104 VR CARBON 6mm ª 100K RELAYS SWITCHES RL101 80003751 RELAY 12V 6P GSA SS 212DM GOOD SKY RL301 80010001 RELAY RUDH SH 112D400ohm GOOD SKY SW101 80012411 SW PO...

Page 93: ... CARBON 1 8W T 5 100ohm R209 R221 R241 R261 R306 R30N R30Y R31X R331 R332 R706 R707 R724 R727 R742 R743 R761 R762 R317 FA040106 CARBON 1 8W T 5 10Mohm SYMBOL PART NO DESCRIPTION R110 R122 R161 FA040103 CARBON 1 8W T 5 10Kohm R167 R288 R293 R307 R30M R30Q R310 R318 R330 R345 R360 R368 R369 R377 R379 R601 R604 R612 R613 R709 R720 R736 R353 FA040154 CARBON 1 8W T 5 150Kohm R154 R357 FA040153 CARBON 1...

Page 94: ...T 47u 25V M C354 GA347645 ELECT 85oC T 47u 35V M C313 GA347655 ELECT 85oC T 47u 50V M C121 C408 GAH10825 ELECT CAP 105oC T 1000u 16V M TK C119 GAH22675 ELECT CAP 105oC T 22u 100V M TK C156 GAH47555 ELECT CAP 105oC T 4 7u 50V M TK C139 C404 GAH47725 ELECT CAP 105oC T 470u 16V M TK C213 C233 C253 GA410575 ELECT NP T 1u 100V M C312 GF215252 MEF CAP BOX 0 0015u 50V J C315 GF210252 MEF CAP BOX 0 001u 5...

Page 95: ...7 TR PNP 2SA1015GR TO 92 T T P S Q325 Q326 Q701 EBA07336 TR PNP 2SA733P TO 92 T N P S Q702 Q703 Q112 Q305 EBA04230 TR PNP BF423 TO 92 T T P Q108 Q317 EBA09281 TR PNP KSA 928A TO 92 T SAMSUNG Q104 EB307720 TR PNP KSB772 TO 126 SYMBOL PART NO DESCRIPTION DIODES D107 D109 D10A EJ044148 DIODE T 1N4148 D117 D119 D125 D126 D127 D129 D202 D203 D204 D205 D210 D211 D230 D231 D250 D251 D302 D304 D311 D313 D...

Page 96: ...A040330 CARBON 1 8W T 5 33ohm R213 R233 R253 FA040391 CARBON 1 8W T 5 390ohm R713 FA040393 CARBON 1 8W T 5 39Kohm R224 R30V FA040302 CARBON 1 8W T 5 3Kohm R119 R129 R148 FA040472 CARBON 1 8W T 5 4 7Kohm R173 R204 R282 R291 R383 R391 R402 R403 R602 R605 R610 R701 R704 R710 R712 R716 R717 R718 R719 R722 R728 R729 R730 R733 R768 R769 R770 R739 R740 R771 FA040471 CARBON 1 8W T 5 470ohm JP1 R30P R359 F...

Page 97: ... ELECT 85oC T 47u 16V M C285 C289 C335 C725 C368 GA347635 ELECT 85oC T 47u 25V M C354 GA347645 ELECT 85oC T 47u 35V M C313 GA347655 ELECT 85oC T 47u 50V M C121 C408 GAH10825 ELECT CAP 105oC T 1000u 16V M TK C119 GAH22675 ELECT CAP 105oC T 22u 100V M TK C156 GAH47555 ELECT CAP 105oC T 4 7u 50V M TK C139 C404 GAH47725 ELECT CAP 105oC T 470u 16V M TK C213 C233 C253 GA410575 ELECT NP T 1u 100V M C312 ...

Page 98: ...SA1015GR TO 92 T T P S Q325 Q326 Q701 EBA07336 TR PNP 2SA733P TO 92 T N P S Q702 Q703 Q112 Q305 EBA04230 TR PNP BF423 TO 92 T T P Q108 Q317 EBA09281 TR PNP KSA 928A TO 92 T SAMSUNG Q104 EB307720 TR PNP KSB772 TO 126 SYMBOL PART NO DESCRIPTION DIODES D107 D109 D10A EJ044148 DIODE T 1N4148 D117 D119 D125 D126 D127 D129 D202 D203 D204 D205 D210 D211 D230 D231 D250 D251 D302 D304 D311 D313 D314 D315 D...

Page 99: ...PTION R213 R233 R253 FA040391 CARBON 1 8W T 5 390ohm R713 FA040393 CARBON 1 8W T 5 39Kohm R224 R30V FA040302 CARBON 1 8W T 5 3Kohm R119 R129 R148 FA040472 CARBON 1 8W T 5 4 7Kohm R173 R204 R282 R291 R383 R391 R402 R403 R602 R605 R610 R701 R704 R710 R712 R716 R717 R718 R719 R722 R728 R729 R730 R733 R768 R769 R770 R739 R740 R771 FA040471 CARBON 1 8W T 5 470ohm JP1 R30P R359 FA040473 CARBON 1 8W T 5 ...

Page 100: ... ELECT 85oC T 47u 16V M C285 C289 C335 C725 C368 GA347635 ELECT 85oC T 47u 25V M C354 GA347645 ELECT 85oC T 47u 35V M C313 GA347655 ELECT 85oC T 47u 50V M C121 C408 GAH10825 ELECT CAP 105oC T 1000u 16V M TK C119 GAH22675 ELECT CAP 105oC T 22u 100V M TK C156 GAH47555 ELECT CAP 105oC T 4 7u 50V M TK C139 C404 GAH47725 ELECT CAP 105oC T 470u 16V M TK C213 C233 C253 GA410575 ELECT NP T 1u 100V M C312 ...

Page 101: ... H V EW OUT HOUT V GEOMETRY SYSTEM ARCHITECTURE MCU E ROM DDC WT6232 24C08 MOTHER BOARD KEY BOARD I C HOR DEFLECT STAGE DC DC B DYNAMIC FOCUSING VERT OUT TDA 8172 EH T D F R G B FBLK OSD MTV 016 RGB PREAMP LM1281 CUT OFF RGB OUT LM2438 CUT OFF R G B KA3842 H HV V 98 BLOCK DIAGRAM ...

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