ViewSonic VA912/b-3 Service Manual Download

Page: 66 / 70

Model

Title

Date

Rev:

ViewSonic Corporation

POWER

ViewSonic

Corporation

nfidential

Not

Copy

VA912/b-3

VSCM

VOP

VPREF

VOP

VAA

VSCN_OUT

VOP

VSCN

V33C

VPREF

V18C

VSCM_ADJ

VCM

VCN

V33A

VCM_PWM

GMA7

GMA5

VS6

VS14

VS9

GMA12

VS7

GMA9

GMA4

VS8

GMA2

VS2

GMA13

GMA11

VS10

VS5

GMA10

VS11

VS12

GMA14

GMA8

GMA6

VPREF

VS3

GMA1

VS1

GMA3

VS4

VPREF

VCN

VS13

V18C

PANEL_ON/OFF

VAA

V33C

V5A

VCM_PWM

V33P

VCM

GMA10

GMA5

GMA9

GMA6

GMA12

GMA8

GMA7

GMA4

GMA3

GMA11

GMA14

GMA13

GMA1

GMA2

V5A

GND_POWER

V5A

V33A

GND_POWER

(SCALER VCC)

9.99V

(Panel VCC)

(SCALER Core VCC)

(PANEL VCC)

R98

VCN1

GMA2

GMA6

R104

R82

R100

R81

VOP1

D21

R107

C105

R93

C108

GMA7

GMA3

R204

V33C1

C71

Q11

R201

C78

R70

GND

VOUT

VIN

VOUT

U10

QP19

R205

R105

R66

GND

VOUT

VIN

VOUT

R92

R86

R96

L15

GMA8

C93

C115

GMA11

C91

C111

R102

GMA1

D20

Q10

R64

R106

C92

L17

GMA9

R74

R76

VPREF1

VCM1

GMA5

R83

GND

VOUT

VIN

VOUT

U12

C113

PP12

Vout

GND

Vin

C79

GMA14

R89

R75

R90

C104

C72

GMA12

R99

R79

R206

C112

R101

R87

V33A1

R71

C106

L18

R80

R207

C94

R65

R202

C103

R97

R208

C109

C107

GMA10

GND

VOUT

VIN

VOUT

U13

C81

R203

U14A

R103

C100

U14B

C70

R67

C73

C110

R72

PP11

GMA13

R91

V18V1

L16

C80

C114

R73

GMA4

R61

R108

R88

Summary of Contents for VA912/b-3

Page 1: ...Service Manual ViewSonic VA912 b 3 Model No VS10931 19 Color TFT LCD Display VA912 b 3_SM Rev 1a Oct 2005 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583...

Page 2: ...of 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 tim...

Page 3: ...on 10 4 Circuit Description 16 5 Adjustment Procedure 18 6 Troubleshooting Flow Chart 42 7 Recommended Spare Parts List 48 8 Exploded Diagram and Exploded Parts List 53 9 Block Diagram 55 10 Schematic...

Page 4: ...n while servicing this LCD display Because of the high voltage used in the inverter circuit the voltage is exposed in such areas as the associated transformer circuits 4 LCD Module Handling Precaution...

Page 5: ...in the LCD contains a small amount of mercury Please follow local ordinances or regulations for disposal 13 The LCD module contains a small amount of materials having no flammability grade The LCD mod...

Page 6: ...ethods Only touch the metal frame of the panel or the front cover of the monitor Do not touch the surface of the polarizer Surface of the panel is pressed by fingers this may cause MURA Take out the m...

Page 7: ...nic Corporation Confidential Do Not Copy VA912 b 3 4 Correct Methods Incorrect Methods Place the monitor on a clean soft foam pad Place the monitor on foreign objects That could scratch the surface of...

Page 8: ...eo Signals 1 Video RGB Analog 2 DVI Digital Separate Video Impedance 75 Ohms Analog Maximum PC Video Signal 950 mV with no damage to monitor Maximum Mac Video Signal 1250 mV with no damage to monitor...

Page 9: ...2KV transient test with no damage Power Supply Line Surge Immunity Shall be able to withstand 2KV L L and 2 3KV L PE with no damage Power Supply Missing Cycle Immunity Shall be able to function prope...

Page 10: ...37 9kHz Yes Yes 7 640 x 480 75Hz 37 5kHz Yes Yes 8 640 x 480 85Hz 43 27kHz Yes Yes 9 720 x 400 70Hz 31 5kHz Yes Yes 10 800 x 600 56Hz 35 1kHz Yes Yes 11 800 x 600 60Hz 37 9kHz Yes Yes 12 800 x 600 75H...

Page 11: ...here should be no audible vibration with volume at 100 Input signal within 1 Vrms Screen image There should be no affect on the screen image stability under any conditions Connector PC99 requirement A...

Page 12: ...ntrast Max Brightness Max 280 cd m2 Typ after 15 minute warm up 180 cd m2 Min after 15 minute warm up Brightness Uniformity 13 Points U 76 typ 67 Min U Min Luminance in 13 points Max Luminance in 13 p...

Page 13: ...ns and adjusts the displayed control Also a shortcut to display the Contrast adjustment control screen Displays the control screen for the highlighted control Also toggles between two controls on some...

Page 14: ...press button 1 twice The following tips may help you optimize your display Adjust the computer s graphics card so that it outputs a 1280 x 1024 60Hz video signal to the LCD display Look for instructi...

Page 15: ...ave more than one computer connected to the VA912 VA912b Audio Adjust Volume increases the volume decreases the volume and mutes the audio Mute temporarily silences audio output Color Adjust provides...

Page 16: ...ideo signal input coming from the graphics card in the computer the LCD model number the serial number and the ViewSonic website URL See your graphics card s user guide for instructions on changing th...

Page 17: ...screens Resolution Notice allows the user to enable or disable this notice If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1280 x 1024 the following...

Page 18: ...n the OSD background On or Off Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual Vi...

Page 19: ...step up PWM controller incorporating a soft start and a short circuit protection SCP function This device consists of an on chip voltage reference error amplifier pulse width modulation controller und...

Page 20: ...TSU57AK The TSU57AK is a high performance and fully integrated graphics process IC solution for LCD monitors with resolution up to SXGA It is configured with an integrated triple ADC PLL a high qualit...

Page 21: ...omputer and LCD monitor on B Press the Auto button on monitor keypad to Auto Adjust C The LCD monitor will start the Auto Adjust process automatically and run for 10 consecutive seconds during which t...

Page 22: ...Gray Test Signal 1280 1024 60Hz Test Pattern Full Screen 50 White Gray Inspection Item Bright Dot Particle Line Defect Mura 5 9 White Box Test Signal 1280 1024 60Hz Test Pattern Window standard patter...

Page 23: ...t Signal 1280 1024 60Hz Test Pattern Full Screen Green Inspection Item Bright Dot Partial Line Defect 5 13 Blue Test Signal 1280 1024 60Hz Test Pattern Full Screen Green Inspection Item Bright Dot Par...

Page 24: ...ray Scale Up Down From 0 to 100 White Inspection Item Line Defect Function Defect 5 16 Block Window Test Signal 1280 1024 60Hz Test Pattern Black block at the center Inspection Item Cross Talk Optical...

Page 25: ...From 0 to 100 White Figure 1 2 Gray_Scale_0 100_H Horizontal 64 256 Gray Scale From 0 to 100 White Figure 2 3 Black Full Screen Black Figure 3 4 Red Full Screen 50 Red Figure 4 5 Green Full Screen 50...

Page 26: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 23 Figure 5 FIGURE 8 FIGURE 7 FIGURE 6 FIGURE 5...

Page 27: ...1 1 1 Software a Please download the file M Star from CMO E Sir system There are ISP BIOS two files kindly see as below a ISPACK EXE Main program b Ancillary ISPACK EXE Description program 1 1 2 Hardw...

Page 28: ...install the programs respectively as below B ISP BIOS software file to be about to produce the next If the file existence already needn t to set up C repeat This system is applied to Win 95 98 NT 200...

Page 29: ...6 2 When ISP Tool executing at the first time it is required to enter Security Data Please press then input related information as Fig 2 3 Select correct Micro Controller as Fig 3 4C 7C 4C 77 For A190...

Page 30: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 27 4 Installation software Select want download correct file Step 3 Example The path of software Step 4 Press RUN...

Page 31: ...ation Confidential Do Not Copy VA912 b 3 28 5 When everything is done Please turn off the power and restart it again Check Factory Mode and make sure it already be updated 1 4 Verification BIOS Update...

Page 32: ...VA912 b 3 29 C Monitor Assembly and Disassembly 1 Separate Stand Assy 1 1 Remove Stand Cover Step 1 Press Stand Assy s bottom part in Seat Hinge Step 2 Remove Cover Hinge Step 3 Loose and Remove 4 sc...

Page 33: ...2 Separate Rear Cover Rear Case Assy Loosen and remove 5 screws Separate Bezel hooks to take Bezel and Rear Cover apart Step 1 Loose and remove 2 screws Step 2 Separate Bezel hooks to take Bezel and...

Page 34: ...Confidential Do Not Copy VA912 b 3 31 3 Remove Power Board 3 1 Remove 2 pieces of Backlight wires 3 2 Remove Metal Cover Step 1 Loose and remove 4 screws Step 2 Loose and remove 2 screws Step 3 Loose...

Page 35: ...wSonic Corporation Confidential Do Not Copy VA912 b 3 32 3 3 Remove Power PCBA Step 4 Remove the Cover of X PCB Step 5 Completed Step 2 Loose and remove 4 screws Step 1 Insert 2 pieces of Backlight wi...

Page 36: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 33 Step 3 Remove Power PCBA Step 4 Completed...

Page 37: ...on Confidential Do Not Copy VA912 b 3 34 4 Change New Power Board 5 Remove AD PCBA 5 1 Remove FFC Step 1 Remove 2 FFC from AD PCBA Step 1 Insert New Power PCBA Step 2 Fasten 4 fixed screws of Power PC...

Page 38: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 35 Step 2 Remove AD PCBA Step 1 Loose and remove 4 screw 5 2 Remove AD PCBA Step 2 Remove FFC...

Page 39: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 36 6 Change New AD PCBA Step 1 Place New AD PCBA Step 3 Completed Step 2 Fasten 4 screw Step 3 Insert FFC...

Page 40: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 37 7 Remove OSD PCBA Step 4 Insert 2 FFC Step 5 Completed Step 2 Separate both Audio Cable Step 3 Take OSD PCBA apart Step 1 Remove FFC...

Page 41: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 38 8 Change New OSD PCBA Step 1 Place New OSD PCBA Step 2 Insert Audit Cable to connectors of OSD PCBA Step 3 Completed Step 4 Completed...

Page 42: ...orporation Confidential Do Not Copy VA912 b 3 39 9 Add Cover to AD PCB Heatsink Step 1 Join the cover hooks of X PCB Step 5 Completed Step 3 Fasten 2 screws Step 2 Fasten the 4 screws Step 4 Fasten th...

Page 43: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 40 10 RearAssy Assembly Step 1 Place Rear Cover Step 2 Join Rear Cover with Bezel Step 3 Fasten 2 screws Step 4 Completed...

Page 44: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 41 11 Stand Assy Assembly Step 5 Fasten 4 screws to fixed Stand Assy Step 6 Insert Cover Hinge Step 1 Place Stand Assy Step 7 Place Stand Assy...

Page 45: ...e Missing Line Bright Dot Dark Dot Backlight Check PCB Check Panel Light Leakage Mura Image Sticking Brightness spot Particle Dot Defect Check Panel No display Check PCB Check Panel Check Wire Noise C...

Page 46: ...heck Panel No signal Check PCB Check Wire Power on Display abnormal Check PCB Check Panel Flicker Check PCB Check Panel D sub cable change Panel Chan e Should be Performed to Level 3 Repair stage Next...

Page 47: ...nnector Cable change OSD cable Change PW cable Change Next Step Panel Change Should be Performed to Level 3 Repair stage Unavailable Check PCB Check Wire LED Dark LED Abnormal LED Flicker AD B Change...

Page 48: ...Wire Display Shut Down Check PCB Check Panel Display flicker tapping Check PCB CheckPanel Next Step Panel Change Should be Performed to Level 3 Repair stage AD B Change AD B Change AD B Change P B Cha...

Page 49: ...No Signal Input u Check the signal connection between the computer and LCD monitor l Out of Range u Check the computer image output resolution and frequency and compare the value with the preset value...

Page 50: ...V_Position u Check image size setting u Perform Auto Adjust u Use OSD Color Menu to adjust color setting l Color too dark u Use OSD Color Menu to adjust color setting l Dark area distorted u Use OSD C...

Page 51: ...Injex C 00004028 40 D003818 AJ0E3H1A C E K W2F 40 D003818 1 12 Seat Assy A190E3 H0F BLACK C Hontech Precision Industry C 00004030 40 D003821 AJ0E3H1A C E K W2F 40 D003821 1 13 Stand Assy A190E3 H0F B...

Page 52: ...0000559 42A9940007 42A9940007 2000 29 Miscellaneous Tape Security Tape OPP L900xW50x0 045mm VSC M 00000560 7345511002 7345511002 1 30 Carton A190E3 H0F 536 mmx148 mmx475 mm Chen Ti Paper VSC_VA912 3 P...

Page 53: ...0cm Black JCE CB 00000547 32F3018003 32F3018003 1 17 FFC OSD 22 Pins TennRich CB 00004035 32 D003899 32 D003899 1 18 Carton Label for A190E3 H0F 76 2 mmx76 2 mm Chang Huang VSC VA912b 3 DC 00004038 77...

Page 54: ...1 D000632 PCBA Cover Assy A190E3 ASSY common 1 21 N A 73 D004702 Isolated Tape PET 147 mmx137 mmx0 1 mm common 1 22 A 00004021 27 D003115 Lips Without Audio DAC 19M001 BF Ver 00 A 19 V 2 5 A 5 V 3 A 4...

Page 55: ...ftware EDID_DVI A190E3 Ver NRVSCxxxxD00 ViewSonic Checksum x x DVI Port common 1 42 N A 10 D003931 Software BIOS A190E3 Ver NR19E3HS3000 ViewSonic Checksum xxxx RSDS Dual Audio common 1 43 P 00002378...

Page 56: ...8 Exploded Diagram and Exploded Parts List Model Title Date Rev ViewSonic Corporation ViewSonic Corporation Confidential Do Not Copy VA912 b 3 53...

Page 57: ...1 4 N A 73 D005094 MYLAR LIGHT LEAKAGE 1 5 C 00004028 40 D003818 Rear Assy A190E3 H0F BLACK C 1 5 1 N A 40 D003813 REAR 1 5 2 N A 41 D003804 SUPPORT PLATE 1 5 3 HW 00000557 42A9930017 SCREW T3 8L 1 5...

Page 58: ...ration Confidential Do Not Copy VA912 b 3 9 Block Diagram OSD Key Pad Audio Out D sub Analog Video Speaker AC Power DC DC Main Board LIPS Backlight LCD Module DC 5V DVI D Digital Video 3 3V Signal Aud...

Page 59: ...V18C V33C OR0N OR0P OG2N OR1P OR1N OR2P OR2N OG0P OG0N OG1P OG1N OG2P OB0N OB0P OB1N OB1P OB2N OB2P ER0N ER0P ER1N ER1P ER2N ER2P EG0N EG0P EG1N EG1P EG2N EG2P EB0N EB0P EB1N EB1P EB2N EB2P V5A B4 MCU...

Page 60: ...P1 DP1 TP 1 VGL1 VGL1 CP15 CP15 CP4 CP4 RP16 RP16 RR1 RR1 CP38 CP38 RP11 RP11 CP17 CP17 RP6 RP6 RP3 RP3 1 3 2 D3 D3 RP53 RP53 CP28 CP28 RP8 RP8 CP37 CP37 RP37 RP37 RP49 RP49 1 3 2 QP4 QP4 1 3 2 QP2 QP...

Page 61: ...28 DAT1 9 DAT1 10 1 3shield 11 DAT3 12 DAT3 13 5V 14 SYNC GND 15 HPD 16 G 26 RGB GND 29 DAT0 17 DAT0 18 0 5shield 19 DAT5 20 DAT5 21 clk shield 22 clk 23 clk 24 B 27 CON1 CON1 1 2 D5 D5 1 3 2 D11 D11...

Page 62: ...59 ViewSonic Corporation Confidential Do Not Copy VA912 b 3 INV_ADJ INV_ON OFF V33C V5 GND_INV GND_POWER GND_POWER V33C V33C 1 2 3 Q19 Q19 R198 R198 R196 R196 C30 C30 8 7 6 5 4 3 2 1 CN2 CN2 R195 R19...

Page 63: ...S 10 X2 11 X1 12 ISDA P3 4 T0 13 ISCL P3 5 T1 14 STOUT P4 2 15 AD2 P6 2 HLFHI 16 P1 0 17 P1 1 18 P3 2 INT0 19 P1 2 20 P1 3 21 P1 4 22 P1 5 23 P1 6 24 P1 7 25 AD1 P6 1 26 AD0 P6 0 27 HSDA P3 1 TX 28 HS...

Page 64: ...Q14 4 5 3 6 2 7 1 8 CP34 CP34 R215 R215 R216 R216 L24 L24 1 AUD_R1 AUD_R1 1 3 2 Q16 Q16 R179 R179 J1 J1 4 5 3 6 2 7 1 8 LP9 LP9 L21 L21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 CN3 CN3...

Page 65: ...ER GND_POWER GND_POWER 3 STEP C53 C53 1 OE1 OE1 1 GVON1 GVON1 R58 R58 1 STV1 STV1 1 POL1 POL1 C59 C59 1 P_VGH1 P_VGH1 1 ESTH1 ESTH1 L11 L11 C58 C58 A_G 2 A_D 6 B_G 5 B_S 4 A_S 1 B_D 3 Q9 Q9 C52 C52 1...

Page 66: ...04 R204 TP 1 V33C1 V33C1 C71 C71 1 3 2 Q11 Q11 R201 R201 C78 C78 R70 R70 GND 1 VOUT 2 VIN 3 VOUT 4 U10 U10 1 3 2 QP19 QP19 R205 R205 R105 R105 R66 R66 GND 1 VOUT 2 VIN 3 VOUT 4 U8 U8 R92 R92 R86 R86 R...

Page 67: ...C15 L3 L3 L4 L4 R188 R188 C28 C28 C1 C1 C6 C6 RIN0 63 GIN0 60 SOGIN0 61 BIN0 58 RIN0M 62 GIN0M 59 BIN0M 57 HSYNC0 37 VSYNC0 38 R 40 R 41 G 43 G 44 B 46 B 47 CK 49 CK 50 REXT 52 REFP 66 REFM 67 ALE CSZ...

Page 68: ...14 15 10 CN7 CN7 R129 R129 R114 R114 1 2 D33 D33 1 3 2 D24 D24 1 3 2 D25 D25 C159 C159 R136 R136 R137 R137 R119 R119 R121 R121 C118 C118 1 2 D28 D28 C125 C125 R131 R131 1 2 3 D31 D31 R135 R135 R125 R...

Page 69: ...ViewSonic Corporation Confidential Do Not Copy VA912 b 3 11 PCB Layout Diagrams 66...

Page 70: ...low Chart 7 Recommended Spare Parts List 8 Exploded Diagram andExploded Parts List 9 Block Diagrams 10 Schematic Diagrams 11 PCB Layout Diagrams B Are you satisfied with this Service Manual Item Excel...

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