background image

10-3. OUTPUT 

R470

NC

R731

NC

150K 

R476

R719

9K1

R494

JUMPER

R465

NC

P2

C457

180/50V

R406

100

2N2 500V

C430

R711

470K 1/

2W

S

G

408

62A

10-16-W

+80V

H-F

L

Y

CS2

R483

NC

HZ15-2-E

VR701

20K

R706

22K

R425

10 1/4W

R430

NC

Q729

BC547B

H/V
adjust

C408

NC

C407

3N3 100V

HDRV

R442

6K8

R448

6K8

820n 100V

C439

R728

47K 1/8W

0.18uF 400V

C426

C720

680P/1KV

Q712

NC

+

C745

10u 

NC

D452

IC403

R701

430K 1/2W

Q751

BC847C

IC601

TDA8172

2

6

3

7

1

4

5

Vs

Vb

FB

+I/P

-I/P

-12V

+O/P

150K 1/4W

R479

H-FLY

BOP

R477

68K 1/

4W

R426

2K 3W

R710

47 1/4W

+12V

T401

79C167-114-HC

3

1

4

2

D405

SB240

D424

31DF6

D421

MLL4148

R704

120 1/

10W

C705

4n7 50V

56C550-500

R749

10K 1/

8W

150K 1/4W

R478

R437

6K8

1u 100V

C436

D704

RG

P10J

R736

22K

Q706

MPSA44

HI

C488

120PF

Q407

B547B

R467

8K2 1/

10W

R604

220 1/4W

VER-

47n 630V

C721

D410

EGP20G

+

C743

2.2UF/25V

R441

NC

BDRV

D487

1N4148

C604

33n 100V

CS3

R434

10K

Q711

NC

SLA5094

47n 630V

C712

C460

2n2/50V

R486

470R

R402

10

R720

100 1/4W

L404

NC

R469

47K 1/8W

T402

79C995-1-B

1

F1

7

F2

EHT

14

5

2

3

6

13

8

9

DAF(11)

G2

12

Q404

NC

F

B

401

JUMPER

Rotation

Q473

PH2369

10n/250V

C451

R715

330K 1/

4W

V-DY

R702

4M7 1/2W

R613

2K2

R427

82K 2W

Q441

NC

Q731

BC847C

+

C434

4.7UF

H-FLY

HI

+

C714

4u7/100V

R474

4K7 1/8W

R742

470 1/

8W

R451

33R 2W

VER+

6.1V

BAV21

D451

+

C742

100u/100V

R708

6.2K

+

C454

NC

CS1

C410

0.1uF 100V

C438

4000P 2KV

R722

4K7 1/

4W

80V

R468

150R 1W

Q424

IRF640A

R455

15R 2W

D706

1N4148

R403

10

+

C402

1UF 250V

R458

330K 1/4W

R491

1M 1/

4W

R748

100 1/10W

D407

MLL4148

R487

10R 1/4W

220K 1/

2W

R459

C746

100P 

-12V

R710

91K

C431

10n 100V

R452

NC

FB412

+12V

+

C432

33u/250V

R714

33K 1/10W

R473

4K7

R404

10

R400

39 1W

D408

FMQ-G2

FS

C452

0.

1uF

 100V

BEAD

Q427

BC517

D714

1N4148

+190V

HI

R482

33K

+

C421

4.

7uF

Q403

2SC5905

C401

1uF

 160V

R605

2K2

R449

NC

1uF 250V

C427

D740

RG

P10D

109.14V

HI

0.18uF 250V

C423

R741

1  1/

2W

+

C455

100u/16V

R756

560 1/2W

C415

330n/250V

R601

10

P2

R602

2.2 1/2W

L402

20mH

L406

1mH

+

C609

47UF/35V

CS4

R454

NC

Q421

90NK70

D403

RG

P10G

R443

33K

IN4148

D409

12V

D481

RGP10J

150K 1/4W

R488

R466

NC

R460

100 1/2W

H-DC SHIFT

ABL

P403

1

2

3

R457

1R 1/2W

D701

MLL4148

T404

79C167-504-L/N

4

1

6

2

3

5

Q423

B547B

R732

75K 1/2W

R713

1K5

D713

1N4148

R718

220K 1/

8W

ZD712

JUMPER

57C706-508

R444

6K8

 

Q708

BC547B

C413

220P 2KV

H-LIN

56C379-16

R438

4K7

R429

2.2K 3W

Q405

NC

+

C453

NC

+

C605

470UF/16V

R433

470 1/4W

ZD402

HZ15-2-E

t

NR601

45 NTCR

C729

4n7/

50V

R435

270  1/2W

+

C715

0.

47uF

 63V

D601

1N4004

D715

1N4148

R729

47K 1/10W

R725

NC

+6.3V

R606

1.8 1/2W

R422

4K7 1/8W

-120V

IC405

UC3843

1

2

3

4

5

6

7

8

COM

P

VFB

SENSE

RT

/C

T

G

ND

OUT

P

UT

VCC

VREF

Z

D

705

P402

2

1

4

3

Q422

B547B

Z

D

704

NC

D453

Q732

TBC516

V-DF

R436

330R

R703

47 1/10W

C703

22n 50V

57C751-4

R712

33K 1/8W

+

C701

10u/50V

R485

1M 1/2W

D406

BAV21

ABL-CON

R405

10

H-DY

+

C603

470UF/16V

C414

220P 2KV

R439

1K5

R707

2K2

R945

Jumper

R705

430 1/

2W

2SJ584

Q426

Q419

BC337-40

+

C702

2.2uF  

+

C456

10u/

160V

Q710

BC857C

Q429

BC847C

H-UNLOCK

P2

R428

2.0 3W

R461

22K

L401

73C147-542-H

2

5

4

3

H/V
adjust

C489

120PF

R445

33K

C602

220nF 100V

20K

R423

L909

180uH

R481

10 1/4W

R447

33K

Q440

NC

0.39uF 250V

C420

0.1uF 250V

C428

Q408

B547B

BSN254A

Q402

T403

79C167-502-T

6

4

7

2

8

9

10

R456

150K 1/

10W

D742

RG

P10D

R440

1K 1/10W

R601

2.2 1/2W

R724

NC

HZ33-2-E

R716

10K

3n3 630V

C461

C704

22n 50V

R450

47R 1/

4W

R733

NC

R475

560R 1/2W

 

 
 

 

ViewSonic Corporation

                                                           

Confidential - Do Not Copy

             

G90fB-4

 

48

Summary of Contents for G90fB-4

Page 1: ...Service Manual ViewSonic G90fB 4 Model No VS10794 19 Digital Controlled Color Monitor G90fB 4_SM Rev 1a Jan 2006 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583...

Page 2: ...Description 6 4 Circuit Description 10 5 Adjusting Procedure 13 6 Trouble Shooting Flow Chart 17 7 Recommended Spare Parts List 22 8 Exploded Diagram And Spare Parts List 37 9 Block Diagram 39 10 Sch...

Page 3: ...and specifically disclaims any warranty of merchantability or fitness for any particular purpose Further ViewSonic reserves the right to revise this publication and to make changes from time to time i...

Page 4: ...cing pay attention to original lead dress especially in the high voltage circuit If a short circuit is found replace all parts which have been overheated as a result of the short circuit 3 3 All the p...

Page 5: ...WARNING The only potential source of X Radiation is the picture tube However when the high voltage circuit is operating properly there is no possibility of X Radiation problem The basic precaution wh...

Page 6: ...ets VESA 800 x 600 75Hz 85Hz MAC 1024 x 768 75Hz VESA 1024 x 768 75Hz 85Hz MAC 1152 x 870 75Hz VESA 1280 x 1024 75Hz Other Factory Presets IND 640 x 400 70Hz VGA 640 x 480 60Hz VESA 640 x 480 85Hz 6 D...

Page 7: ...70 mm 16 External Connection 15 Pin D sub Connector AC Power Cord 17 Power Consumption Modes ON Mode 75Watts Sleep 4Watts Off 2W Power switch off 18 Regulatiory Safety North America Regulatory Filing...

Page 8: ...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 From PC 2 GREEN V 10 Sync GND 3 BLUE V 11 NC 4 NC 12 SDA 5 G...

Page 9: ...creen 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 next page and are defined in Main Menu Controls on page 8...

Page 10: ...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 the arrow buttons on the front control panel of your monit...

Page 11: ...he screen image Vertical Position moves the screen image up or down Pincushion curves the vertical sides of the screen image Pin Balance curves the vertical edges of the screen image to the left or ri...

Page 12: ...dds 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 Individual adjustments for red green and blue Moire reduces inte...

Page 13: ...control facilities Further the IC generates the drive waveforms for DC coupled vertical boosters to the TDA8172 H V sync signals processor The functions of the sync processor include polarity detectio...

Page 14: ...External capacitors on XTAL1 and XTAL2 are not allowed B Control Function Block The B control block of the SAA4849 has the same behaviour as the TDA4856 with adapted threshol voltages The circuit allo...

Page 15: ...Output Voltage IC901 Power IC for Switching Power Control Q937 Q937 Use for Power Saving Q912 Q920 Push Pull Topology to Drive Q911 Q913 Degaussing Switcher Transistor IC903 5V Regulator IC Q403 HOR...

Page 16: ...tment 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 VR903to be...

Page 17: ...AM 50 COLOR TEMPERATURE ROTATION OSD EXIT HT HC RASTER VG MAX V SIZE GAIN RANGE HG H SIZE GAIN H MOIRE REDUCE HS SUB H SIZE V MOIRE REDUCE TOP CORNER HL H Linearity Modify BOTTOM CORNER VF V FOCUS ADJ...

Page 18: ...s the menu Key to enter second menu press the down key to select zoom about 10S then enter into factory setting area for modulation B Set R G B gain DAC value for 50 R G B bias DAC value for 60 C Rast...

Page 19: ...ctive color purity Make minor adjustments if needed RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets Deflection Yoke 4 pole Convergence Magnets 6 pole Convergence Magnets 6 Convergence adjustme...

Page 20: ...HECK HIGH VOLTAGE OF CRT ABOUT 25 5 26 5KV PLEASE CHECK POWER SAVING CIRCUIT OR POWER SUPPLY CIRCUIT ENTER POWER OR POWER CIRCUIT FAIL CHECK THE HEATER VOLTAGE AT CRT SOCKET ABOUT 6 3V CHECK THE 6 3V...

Page 21: ...HE VOLTAGE AT PIN10 14 17 22 OF IC801 ABOUT 5V CHECK 5V SUPPLY CIRCUIT CHECK THE SIGNAL OUT ABOUT 0 7VP P CHECK SIGNAL CABLE OR INTERFACE CARD CHECK THE CLAMP PULSE OF IC801 PIN27 CHECK THE RELATIVE C...

Page 22: ...VOLTAGE OF IC802 PIN12 ABOUT 83V AND IC802 PIN2 ABOUT 12V CHECK THE 83V 12V SUPPLY CIRCUIT OR MAIN BOARD CHECK THE VOLTAGE OF CRT CATHODE ABOUT 50VP P CHECK THE RELATIVE CIRCUIT OF IC802 OUT PUT CHEC...

Page 23: ...IRCUIT CHECK IC101 PIN33 34 CHECK THE IC601 PIN1 ABOUT 11 8V PIN 4 ABOUT 12V CHECK D601 C605 6 9 Vertical center NG READJUST V CENTER RELATIVE CKT CHECK IC401 AND IC601 6 10 Side pin cushion distortio...

Page 24: ...K 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 CHECK F901 SW901 CHECK LINE RECTIFIED SMOOTHED VOLT CHEC...

Page 25: ...00 S IC901 1 20 COIL E 00004074 73C 147542 H L401 1 21 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 22 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 23 2SC5905 E 00004089 57C 706508 Q...

Page 26: ...004060 56C 625500 S IC901 1 20 COIL E 00004074 73C 147542 H L401 1 21 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 22 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 23 2SC5905 E 000040...

Page 27: ...S IC901 1 COIL E 00004074 73C 147542 H L401 1 NTCR 10OHM 20 5A THIN E R 0405 0377 61C 58 9T NR901 1 PTCR 9OHM 20 220V WAL E 00002725 61C 52 27 4W PR901 1 2SC5905 E 00004089 57C 706508 Q403 1 BC547B E...

Page 28: ...34 P 00004101 45C 76 20 RN PE BAG FOR MONITOR 1 35 P 00002871 45C 76 28 V3 PE BAG FOR MANUAL 1 36 N A 45C 76 34 RN PE BAG FOR BASE V000 0 37 N A 45C 88601 C EPE COVER 1 38 N A 50C 500500 CABLE TIE 2...

Page 29: ...E 00003272 64C178J824 1T 0 82UF 100V C439 1 108 N A 65C 2K103 3A6921 0 01UF 2KV C919 1 109 E 00004473 65C 2K121 5A6921 120PF 2KV C488 1 110 E 00004473 65C 2K121 5A6921 120PF 2KV C489 1 111 N A 65C305...

Page 30: ...128 SCREW M3x8 1 181 N A 705C995DC5704P Q901 ASS Y 1 182 N A 750A55379951AI 19 MPRII CRT ASS Y E750A 0 183 N A 750A55379951AK 19 TCO CRT ASS Y E750A 0 184 N A 705C995DAC101P AC ASS Y 1 185 N A 705C995...

Page 31: ...625 95C 90 23 JUMPER J056 0 260 E 00003625 95C 90 23 JUMPER J057 0 261 E 00003625 95C 90 23 JUMPER J058 0 262 E 00003625 95C 90 23 JUMPER J059 0 263 E 00003625 95C 90 23 JUMPER J060 0 264 E 00003625 9...

Page 32: ...1C 17215452T CFR 150K OHM 5 1 4W R479 1 338 N A 61C 17215452T CFR 150K OHM 5 1 4W R488 1 339 N A 61C 17215452T CFR 150K OHM 5 1 4W R962 1 340 N A 61C 17220252T CFR 2KOHM 5 1 4W R155 1 341 N A 61C 1722...

Page 33: ...5 1 6W R181 1 412 N A 61C 60227252T CFR 2 7K OHM 5 1 6W R153 1 413 N A 61C 60227352T CFR 27K OHM 5 1 6W R412 1 414 N A 61C 60233152T CFR 330 OHM 5 1 6W R436 1 415 N A 61C 60233152T CFR 330 OHM 5 1 6W...

Page 34: ...1 487 N A 93C 3951352T HZ6C2 E ZD104 1 488 N A 93C 3951352T HZ6C2 E ZD105 1 489 E 00003628 93C 3951652T TZX5V1B ZD106 1 490 E 00002740 93C 3951852T TZX8V2A ZD901 1 491 N A 93C 3952752T HZ33 2 E ZD704...

Page 35: ...5T6921 220PF 1KV Y5P 10 C920 1 565 N A 65C 1K470 2T6921 47PF 1KV C928 1 566 N A 65C 1K681 2T6921 680PF 1KV C720 1 567 N A 65C 2K221 5T6921 220PF 2000V C413 1 568 N A 65C 2K221 5T6921 220PF 2000V C414...

Page 36: ...3101 31 100PF 50V C113 1 639 N A 65C0603101 31 100PF 50V C130 1 640 N A 57C 419513 BC847C Q731 1 641 N A 57C 419513 BC847C Q751 1 642 N A 57C 420519 T BC857C Q710 1 643 N A 65C0603101 31 100PF 50V C11...

Page 37: ...0210252T CFR 1K OHM 5 1 6W R818 1 717 N A 61C 60211352T CFR 11K OHM 5 1 6W R832 1 718 N A 61C 60211352T CFR 11K OHM 5 1 6W R833 1 719 N A 61C 60211352T CFR 11K OHM 5 1 6W R834 1 720 N A 61C 60218252T...

Page 38: ...471 5T 470PF 10 50V Y5P C808 1 790 N A 65C 450104 3T 0 1UF 50V Y5V C846 1 791 N A 65C 450104 7T 0 1UF 80 20 50V Y5V C818 1 792 N A 65C 450104 7T 0 1UF 80 20 50V Y5V C849 1 793 N A 65C 4501047TV 0 1UF...

Page 39: ...LS Q426 1 835 N A 90C 275503 HEAT SINK 1 836 N A M1C1730 8128 SCREW M3x8 1 837 N A 9C 203 9 PIN 1 838 E R 0405 0377 61C 58 9T NTCR 10OHM 20 5A THIN NR901 1 839 N A 61C 58 9W NTCR 10OHM 20 5A WALS NR90...

Page 40: ...Model G90fB 4 Title Date Rev 8 Exploded Diagram And Spare Parts List ViewSonic Corporation Confidential Do Not Copy G90fB 4 37...

Page 41: ...AD 1 PCS 5 N A 33C6337 1 LENS 1PCS 6 N A 33C6336 E7 T POWER KNOB 1 PCS 7 N A 1C 503 5T 47 SCREW 4 PCS 8 N A 85C6024 506 SHIELD 1 PCS 9 C 00004891 34C6286 E7 T REAR COVER 1 PCS 10 HW 00002749 Q1C 340 1...

Page 42: ...PRE AMP On screen display Q403 T402 FBT HOR O P Q402 T401 HOR DRIVER IC601 STV8172A VERT O P EHT G1 G2 FOCUS IC405 UC3843 EHT 26KV H HV CRT R SIGNAL CABLE G B R G B V IC101 SAA4849PS V1016 CRYSTAL 48...

Page 43: ...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 AGND Bsens Bin BOP Vssa VDDA MODE XTAL1 XTAL2 NC REM EEP W R...

Page 44: ...SAA4849 ViewSonic Corporation Confidential Do Not Copy G90fB 4 41...

Page 45: ...M24C08 BN6 IC102 8 5 6 1 2 3 7 4 VCC ISDA ISCL A0 A1 A2 WP A4 IC601 TDA8172 2 6 3 7 1 4 5 Vs Vb FB I P I P 12V O P ViewSonic Corporation Confidential Do Not Copy G90fB 4 42...

Page 46: ...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 SDA SCL 3OUT CAP D ViewSonic Corporation Confidential Do N...

Page 47: ...LM2465 IC802 56C551 521 4 8 9 6 2 3 1 7 5 Vcc Vbb I P I P B O P G O P R O P I P GND ViewSonic Corporation Confidential Do Not Copy G90fB 4 44...

Page 48: ...IC901 TEA1507P 1 2 3 4 5 6 7 8 VCC GND CTRL DEMAG SENSE DRIVER NC DRAIN LM2480NA IC803 56C539 6 1 2 3 4 5 6 7 8 Ri Gi Bi GNDVCC Bo Go Ro ViewSonic Corporation Confidential Do Not Copy G90fB 4 45...

Page 49: ...71KHz 83KHz SW102 R419 22K 1 2W 0 324V 47 R119 TZX5V1B ZD106 10K J015 HCadj 1 286V 4 7K R123 12V HUNLOCK 0 005V 45KHz 51KHz 2K2 R138 H LIN 5 015V 40 5KHz 45KHz CS3 4 7K R149 0 01uF C123 56C1125 575 X...

Page 50: ...5K6 1 2W Q908 BC547B R902 NC 5 1V J018 D942 NC U4KB80R BD901 2 1 3 4 RY901 4 3 1 2 6 5 12V 0 47 1 4W R924 C939 1000UF 16V C936 100UF 100V TCET1103 CN901 1 2 3 57C724 502 73A174 7 S3G C944 1000UF 25V 1...

Page 51: ...V R714 33K 1 10W R473 4K7 R404 10 R400 39 1W D408 FMQ G2FS C452 0 1uF 100V BEAD Q427 BC517 D714 1N4148 190V HI R482 33K C421 4 7uF Q403 2SC5905 C401 1uF 160V R605 2K2 R449 NC 1uF 250V C427 D740 RGP10D...

Page 52: ...805 100 C825 S TEST DDC 5V ZD802 NC 100 R842 80V 100P C812 8K2 R816 BEAD 100P C827 B 33 R805 0 1uF C832 0 1uF C834 80V 6 3V 1N4148 D801 0 033uF C817 1N4148 D804 1000 C820 1N4148 D806 G_GND 0 1uF C810...

Page 53: ...11 PCB Layout Diagrams 11 1 Main PCB Layout ViewSonic Corporation Confidential Do Not Copy G90fB 4 50...

Page 54: ...11 2 CRPC Board Layout ViewSonic Corporation Confidential Do Not Copy G90fB 4 51...

Page 55: ...Flow Chart 7 Recommended Spare Parts List 8 Exploded Diagram and Exploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout Diagrams B Are you satisfied with this Service Manual Item Exc...

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