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ViewSonic Corporation                                                                                                                                                        E90fB-4

 

10

Confidential-Do Not Copy

 

4.

 

CIRCUIT DESCRIPTION

 

 
4-1 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

2

C-bus interface .Standard high current ports,3 ADC pouts with voltage inputs and 4 static standard 8 

bit DAC outputs (low interference) and one PWM output for digital control application are implemented. The 
central processing unit (CPU) manipulates operands in two memory spaces.These are the 1024byte internal 
data memory(consisting of 256 bytes standard RAM and 768 bytes AUX-RAM) and 48K-byte internal program 
memory . The programmemory of the SAA4849 consists of 48K bytes ROM. 

The SAA4849P provides sync. Processing with full auto 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 signals processor 

 

The functions of the sync processor include polarity detection, H-SYNC & V-SYNC signals counting, 

Programmable SYNC signals output, free running signal generator. Pin52/Pin53 are for the H-SYNC and 
V-SYNC input.

 

  and the polarity are setting in the positive. When no signal input, the Pin49 will output a 75Hz

 

V-SYNC free run signal. The Pin18/20will output a 60KHz H-SYNC free run signal. for the monitor testing use.

 

 

Reset Circuit(pin23) 

 

There are three ways possible to invoke a reset and initialize the SAA4849 micro controller part: 
 

Via power-on reset circuit 

                    Via watchdog timer overflow(only micro controller reset) 
          Via deflection reset after start up(only micro controller reset) 
 

The reset pin(pin23) is connected to a Schmitt trigger for nose reduction. A reset is accomplished by holding the 
Reset pin HIGH. 

 

2.7K

R153

+

22U

C145

0.1UF

C102

 

 

5V 

RST  Pin23 

Содержание PerfectFlat E90fB-4

Страница 1: ...fB 4 1 Confidential Do Not Copy ViewSonic E90fB 4 Model No VCDTSXXXX X 19 Digital Controlled Color Monitor E90fB 4_SM_884 Rev 1a Jun 2005 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800...

Страница 2: ...either expressed or implied with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to...

Страница 3: ...otices 1 2 Specification 3 3 Front Panel Function Control Description 6 4 Circuit Description 10 5 Adjusting Procedure 13 6 Trouble Shooting Flow Chart 17 7 Recommended Spare Parts List 24 8 Exploded...

Страница 4: ...d AC power line before servicing the chassis 3 2 In servicing pay attention to original lead dress especially in the high voltage circuit If a short circuit is found replace all parts which have been...

Страница 5: ...se only Panasonic replacement picture tubes 7 X RADIATION WARNING The only potential source of X Radiation is the picture tube However when the high voltage circuit is operating properly there is no p...

Страница 6: ...e V Morie Memory Recall Language ViewMeter OSD position select 5 Input Video Signal Timing Timing116 Timing119 Timing 127 Timing 129 Timing 139 Resolution 640 480 640 480 800 600 800 600 1024 768 H KH...

Страница 7: ...lbs Net 21 2 kgs 46 7 lbs Gross 15 Dimensions Machine Package Width 445 mm 17 6 inches 540 mm Height 424 mm 16 7 inches 378 mm 14 9 inches w o base 530 mm Depth 465 mm 18 3 inches 570mm 16 External C...

Страница 8: ...em device and lock both screws 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 V 9 5V Fro...

Страница 9: ...Front Panel Function Control Description Adjusting the Screen Image Use the buttons on the front control panel to display and adjust the OSD controls The OSD controls are explained at the top of the...

Страница 10: ...y briefly indicating that the OSD image settings are now unlocked Do the following to adjust the screen image 1 To display the Main Menu press button 1 2 To select a control you want to adjust press t...

Страница 11: ...ht of the screen image Horizontal Size adjusts width of the screen image Vertical Position moves the screen image up or down Pincushion curves the vertical sides of the screen image Pin Balance curves...

Страница 12: ...in most office settings with fluorescent lighting 6500K Adds red to the screen image for warmer white and richer red 5000K Adds blue and green to the screen image for a darker color User Color Individ...

Страница 13: ...g with full auto 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...

Страница 14: ...48MHz Other quartz 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 SAA4849 has the same behavi...

Страница 15: ...ltage D930 Rectifier for Output Voltage D918 Rectifier for Output Voltage IC901 Power IC for Switching Power Control Q937 Q937 Use for Power Saving Q912 Q920 Push Pull Topology to Drive Q911 Q913 Dega...

Страница 16: ...SW102 DOWN PCB MAIN SW103 SELECT PCB MAIN SW104 5 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 Vo...

Страница 17: ...SS G BIAS PINCUSHION R BIAS TRAPEZOID 9300 COLOR TEMPERATURE PIN BALANCE 6500 COLOR TEMPERATURE PARALLELOGRAM 50 COLOR TEMPERATURE ROTATION OSD EXIT HD H DRIVER COMPENSATION VG MAX V SIZE GAIN RANGE H...

Страница 18: ...e and save in the memory 3 White Balance Luminance adjustment A Press MENU Key to show OSD menu and press the down Key to select the size center function then press the menu Key to enter second menu p...

Страница 19: ...wo tabs which should be approximately 180 D Check the complete blue and complete green patterns to observe their respective color purity Make minor adjustments if needed RELATIVE PLACEMENT OF TYPICAL...

Страница 20: ...VOLTAGE CHECK THE VOLTAGE OF CRT HEATER ABOUT 6 3V CHECK VOLTAGE OF THE CRT CHECK BRIGHTNESS CIRCUIT OK CHECK POWER SAVING CIRCUIT ABNORMAL H SYNC V SYNC SIGNAL CHECK SCREEN VOLTAGE ABOUT LESS THAN 30...

Страница 21: ...IC801 R G B APPROACH STANDARD CHECK SIGNAL CABLE OR INTERFACE CARD CONTRAST SET MAX PIN 10 18 ABOUT 5V CHECK 5V RELATIVE CIRCUIT CHECK THE IC801 PIN 23 RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK IC801 PI...

Страница 22: ...F CHECK THE VOLTAGE OF CRT CATHODE ABOUT 40Vpp CHECK THE VOLTAGE OF FBT SCREEN CHECK THE RELATIVE CIRCUIT CHECK THE 5V PIN ON MAIN PCB RELATIVE CIRCUIT OF P802 CONNECTOR ABOUT 400V TO 700V EXCEED 700V...

Страница 23: ...4 HOR OSC DEF HV CIRCUIT FAULT 6 4 1 NO RASTER DISCONNECT WITH SIGNAL CABLE NG OK OK OK NG NG NG CHECK THE COLLECTOR VOLTAGE CHECK THE COLLECTOR VOLTAGE RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK Q402 T4...

Страница 24: ...ABNORMAL HORIZONTAL WIDTH OF VIDEO NG OK CHECK THE RELATIVE CIRCUIT CHECK THE RELATIVE CIRCUIT OF SMPS READJUST H WIDTH FUNCTION OFQ406 CHECK THE HV OF CHECK FBT B VOLTAGE CRT ABOUT 25KV ABOUT 62V AT...

Страница 25: ...IT NG READJUST V SIZE FUNCTION VALUE CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT CHECK IC101 PIN33 34 CHECK THE IC601 PIN1 ABOUT 11 8V PIN 4 ABOUT 12V CHECK D601 C605 6 6 2 VERTICAL CENTER NG READJUST...

Страница 26: ...NORMAL VARIABLE OUTPUT NG OK NG OK OK NG NG OK OK OK NG OK NG YES NO CHECK BRIDGE RECTIFIED CHECK START C K T CHECK IC101 CHECK D925 CHECK Q911 Q911 FAILURE CHECK IC901 CHECK AC LINE VOLT 120V OR 220V...

Страница 27: ...S 34C 741 QE L BASE 1 PCS 34C6285AE7 F FRONT PANEL 1 PCS 34C6286 E7 F BACK COVER 1 PCS 34C6293 QE L SWIVEL 1 PCS 40C 153 17 1B CRT WARNING LABEL 1 PCS 40C 58162410A H V LABEL 1 PCS 40C 58162435A MANUA...

Страница 28: ...0 2 Rear Bracket 1 PCS 40C 581624 2B CHASSIS LABEL 1 PCS 55A 1 4 SOLDER BAR 22 G 71C 100 8 FERRITE CORE 12 25 15 1 PCS B1C1040 12128 SCREW 1 PCS D1C1140 7128 SCREW 4X7 FOR AC 1 PCS M1C1140 6128 SCREW...

Страница 29: ...UF 275V C902 1 PCS 67C 3022114P 220UF 400V C907 1 PCS 67C 305472 3 4700UF 16V C918 1 PCS 65C 2M103 3A6921 10000PF 2KV C919 1 PCS 67C 215470 10 47UF 20 160V C930 1 PCS 67C 21522012P LOW E SD 22UF 250V...

Страница 30: ...FR 0 51 OHM 5 3W R428 1 PCS 61C152M220 64 22 OHM 5 2W R455 1 PCS 61C153M151 59 MOFR 150 OHM 5 3W R456 1 PCS 61C152M109 64 MOFR 1 OHM 5 2W R607 1 PCS 61C152M688 64 MOFR 0 68 OHM 5 2W R608 1 PCS 61C152M...

Страница 31: ...44210113T 100PF 5 NPO 50V C121 1 PCS 65C 44210113T 100PF 5 NPO 50V C122 1 PCS 65C 450103 7T 10000PF 50V Y5V 80 2 C123 1 PCS 65C 444222 5T 2200PF 10 Y5P 50V C124 1 PCS 65C 442471 9T 470PF 50V C127 1 PC...

Страница 32: ...20 1 PCS 64C178J103 2T MPE 0 01UF 250V 5 C925 1 PCS 65C 2K221 5T6921 220PF 2000V C927 1 PCS 65C 1K470 5T6921 47P 1KV C928 1 PCS 67C 305470 4T 47UF 20 25V C929 1 PCS 65C 450473 4T 47000PF 20 80 50V Z5...

Страница 33: ...1 PCS 93C 521ZJ26T SB240 D923 1 PCS 93C1040 252T UF4004 D929 1 PCS 93C202050052T BYV27 200 D930 1 PCS 93A 64 1152T DIODE 1N4148 D936 1 PCS 93A 64 1152T DIODE 1N4148 D937 1 PCS 93C106050152T BYV26C TFK...

Страница 34: ...OHM 5 1 6W R102 1 PCS 61C 60210152T CFR 100 OHM 5 1 6W R103 1 PCS 61C 60210152T CFR 100 OHM 5 1 6W R104 1 PCS 61C 60210152T CFR 100 OHM 5 1 6W R105 1 PCS 61C 60215352T CFR 15K OHM 5 1 6W R106 1 PCS 61...

Страница 35: ...0275252T CFR 7 5K OHM 5 1 6W R146 1 PCS 61C 17256352T CFR 56K OHM 5 1 4W R147 1 PCS 61C 60247252T CFR 4 7K OHM 5 1 6W R148 1 PCS 61C 60210352T CFR 10K OHM 5 1 6W R149 1 PCS 61C 17212452T CFR 120K OHM...

Страница 36: ...1C 17210452T CFR100K OHM 5 1 4W R435 1 PCS 61C 17222252T CFR 2 2KOHM 5 1 4W R437 1 PCS 61C 60233352T CFR 33K OHM 5 1 6W R440 1 PCS 61C 17222252T CFR 2 2KOHM 5 1 4W R442 1 PCS 61C 60247252T CFR 4 7K OH...

Страница 37: ...OHM 5 1 6W R748 1 PCS 61C 17262352T CFR 62K OHM 5 1 4W R749 1 PCS 61C 60222152T CFR 220 OHM 5 1 6W R751 1 PCS 61A212Y10652T 10MOHM 5 1 2W R900 1 PCS 61A212Y10552T MGFR 1M OHM 5 1 2W R901 1 PCS 61C 602...

Страница 38: ...1 PCS 61C 17247352T CFR 47K OHM 5 1 4W R967 1 PCS 61C 17239352T CFR 39K OHM 5 1 4W R969 1 PCS 61C175L22452T CFR 220K OHM 5 1 2W R970 1 PCS 61C 17220252T CFR 2KOHM 5 1 4W R972 1 PCS 61A212Y20452T MGFR...

Страница 39: ...51652T TZX5V1B ZD701 1 PCS 93C 39 7352T HZ6B1 E ZD702 1 PCS 93C 3951652T TZX5V1B ZD726 1 PCS 93C 3951852T TZX8V2A ZD901 1 PCS 93C 39 7352T HZ6B1 E ZD902 1 PCS 93C 39 7752T HZ5C1 E ZD904 1 PCS CRP985D1...

Страница 40: ...V C814 1 PCS 64C176J104 0T 0 1UF 5 63V C815 1 PCS 65C 444101 5T 100 PF 10 50V Y5P C816 1 PCS 65C 444101 5T 100 PF 10 50V Y5P C817 1 PCS 65C 444101 5T 100 PF 10 50V Y5P C818 1 PCS 67C 305470 3T 47UF 20...

Страница 41: ...ODE 1N4148 D812 1 PCS 93A 64 1152T DIODE 1N4148 D813 1 PCS 93A 64 1152T DIODE 1N4148 D814 1 PCS 61C175L56452T CFR 560K OHM 5 1 2W FB804 1 PCS 71C 55 9 T C CORE RF BEAD RH 3 5X6X0 FB805 1 PCS 71C 55 9...

Страница 42: ...233452T CFR 330K OHM 5 1 4W R837 1 PCS 61C 20733052T 33OHM 1 2W R840 1 PCS 73C 5447810T 0 47UH 10 peaking co R841 1 PCS 73C 5447810T 0 47UH 10 peaking co R842 1 PCS 73C 5447810T 0 47UH 10 peaking co R...

Страница 43: ...03 9 PIN 1 PCS 61C 58 9T NTCR 10OHM 20 5A THIN NR901 1 PCS 87C 501 6 AC SOCKET 1 PCS 95C 800 2 1 WIRE HARNESS CN901 1 PCS 84A 7H400 SL FUSE 4A 250V LF 618 004 F901 1 PCS 84C 33 10 FUSE CLIP F901 2 PCS...

Страница 44: ...iagram And Spare Parts List AD AC AB W AA Z Y X V U T S Q R P O N M K L J I F H G E D C B A 1 2 3 4 5 6 8 7 9 10 11 12 13 14 15 16 17 32 21 18 19 20 22 23 24 25 26 27 28 29 30 31 33 34 35 36 37 38 39...

Страница 45: ...6285 AE7 F BEZEL 1PCS 3 33C6339 E7 F OSD KNOB 1PCS 4 33C6338 E7 F KEY PAD 1 PCS 5 33C6337 1 LENS 1PCS 6 33C6336 E7 F POWER KNOB 1 PCS 7 1C 503 5T 47 SCREW 4 PCS 8 85C6027 606 SHIELD 1 PCS 9 34C6286 E7...

Страница 46: ...ViewSonic Corporation E90fB 4 43 Confidential Do Not Copy 9 BLOCK DIAGRAM...

Страница 47: ...47 48 51 12 55 56 22 23 24 25 26 27 28 35 34 33 32 31 30 29 SwiChoice ISCL ISDA Mute G1 Hs Vs DSCL ROTA Pro H LIN Unlock CLAMP VsOUT CS1 CS2 NC OFF VSSE VDDD V5V VSSD BDRV HBGND HDRV HFB Iref Vref AG...

Страница 48: ...ViewSonic Corporation E90fB 4 45 Confidential Do Not Copy SAA4849...

Страница 49: ...E90fB 4 46 Confidential Do Not Copy M24C08 BN6 IC102 8 5 6 1 2 3 7 4 VCC ISDA ISCL A0 A1 A2 WP A4 IC601 TDA4863AJ 1 3 2 6 7 4 5 VCC N VF I P I P GND O P 4 7 1 2 6 3 5 AMPLITIER POWER PROTECTION THERM...

Страница 50: ...on E90fB 4 47 Confidential Do Not Copy IC801 LM1246DKA 1 2 3 4 23 24 5 6 7 8 9 10 15 16 17 18 19 20 21 22 11 12 14 13 V FLY CAPA VDD1 GND1 CLAMP H FLY R G B GNDPLL VCO VCC 2OUT 1OUT GND VDD B G R ABL...

Страница 51: ...ViewSonic Corporation E90fB 4 48 Confidential Do Not Copy IC901 TEA1507P 1 2 3 4 5 6 7 8 VCC GND CTRL DEMAG SENSE DRIVER NC DRAIN IC801 LM1246DKA...

Страница 52: ...ViewSonic Corporation E90fB 4 49 Confidential Do Not Copy...

Страница 53: ...ic Corporation E90fB 4 50 Confidential Do Not Copy IC802 LM2476 15 19 17 18 16 2 8 14 3 6 4 1 5 13 10 7 9 12 11 OUTD1 OUTD2 OUTD3 N C N C VBB INC3 VCC IND3 INC1 IND1 IND2 GND OUTC3 GNDS INC2 OUTC1 N C...

Страница 54: ...124 0 35V 3 159V NC 75K R137 2 4K R103 4 42V SW103 NC R115 100 R117 4K7 R158 56A1133 508 VOUT2 VG 150 1 4W R705 100 R132 39K 1 4W R969 J061 JUMP 12V 0 042V 100 R172 2 527V 12V 1 8K R114 100 R143 0 202...

Страница 55: ...0uF 400V or150uF 450V C907 7K5 R902 500V DEGAUSS IC101 PIN39 68K 9NK70Z Q901 t NR901 3 10 M 1 2W R900 2 2UF 50V C912 1M 1 2W R921 68K L903 73C 25810110T 40KHZ 0 6KV 10U 16V C967 C945 Q912 C940 1n 500V...

Страница 56: ...0K 1 4W R415 150PF 2KV C488 270 1 2W R609 57A419 503 T NR601 57A419 503 T 10 1 4W R450 6 8K R748 4K7 R446 2SC945P NC R717 2 2K R442 1 2W R607 JUMPER R484 G1 11 92V 1 1K 1 4W R414 47K 1 4W R412 Q402 BS...

Страница 57: ...9 BAV21 D804 100OHM L807 1000p 250V C847 J811 BEAD 1N4148 D811 0 1UF C832 68PF C839 B I 8 3 0 7 33 R821 220P 1KV C841 100P C809 10P C842 J810 BEAD 470 C837 BEAD L804 J818 BEAD JUMP R807 R I 53A40 8 FB...

Страница 58: ...ViewSonic Corporation E90fB 4 55 Confidential Do Not Copy 11 PCB LAYOUT 11 1 MAIN PCB LAYOUT...

Страница 59: ...ViewSonic Corporation E90fB 4 56 Confidential Do Not Copy 11 2 CRT BOARD LAYOUT...

Страница 60: ...n 4 Circuit Description 5 Adjusting Procedure 6 Trouble Shooting Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Spare Parts List 9 Block Diagram 10 Schematic Diagrams 11 PCB Layout D...

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