ViewSonic A91f+-1 Service Manual Download Page 47

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Horizontal deflection circuit is defective

﹒

The horizontal deflection
circuit is defective

Is the voltage on terminal
TP202=40V?

Is the power supply
circuit normal?

Is the pin1 waveform of
IC401 normal?

Is the pin28 waveform of
IC401 normal?

Is the pin26 waveform of
IC401 normal?

Is the waveform of Q402
"collector" normal?

Is the waveform of Q401
"BASE" normal?

Is the horizontal output
circut normal?

Is the voltage on terminal
TP201=75V?

Check power supply
circuit

Check H.sync input

Q402 is defective

Horizontal drive is
defective T401, Q4401,
FBT

Horizontal output circuit is
defictive Q407, D406,
C418, Q418, Q409

Yes

0.8Vp-p

64Vp-p

2.4Vp-p

12Vp-p

4.6Vp-p

CRT is defictive

Check step-up circuit
Q401, Q402, Q409

Check IC401 pin26
normal?

ViewSonic

Corporation

nfidential

Not

Copy

A91f+-1

Summary of Contents for A91f+-1

Page 1: ...Model No VCDTS23283 19 Digital Controlled Color Monitor Service Manual ViewSonic A91f 1 ViewSonic 381 Brea Canyon Road Walnut California 91789 USA 800 888 8583 A91f 1_SM_830 Rev 1a Apr 2004...

Page 2: ...ereof 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...

Page 3: ...Trouble Shooting Flow Chart 9 Block Diagram Schematic Diagrams 7 Recommended Spare Parts List 1 Precautions and Safety Notices 5 Adjusting Procedure 8 Exploded Diagram And Spare Parts List 10 PCB Lay...

Page 4: ...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 protective devices munt be reinstalled per original design 3...

Page 5: ...DIATION 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 precau...

Page 6: ...POWER CORD 1 8 METER 2 1 8 SIGNAL CABLE 1 8 METER 2 2 VIDEO INTERFACE 2 2 1 RGB VIDEO ANALOG 0 7 VP P AND 1 VP P POSITIVE INPUT IMPEDANCE 75 OHM 2 2 2 MAX PC VIDEO SIGNAL 950mV WITH NO DAMAGE TO MONIT...

Page 7: ...V SIZE PINCUSION PINBALANCE TRAPEZOID PARALLELOGRAM ROTATION 9300O K 6500O K 5000O K USER R G B LANGUAGES ENGLISH DEUTSCH FRANCAIS ESPANOL ITALIC H MOIRE V MOIRE OSD H POSITION OSD V POSITION INPUT L...

Page 8: ...ON 4 1 10 TIMING CHART REFER TO ITEM 7 2 4 1 11 AMBIENT LIGHTING ENVIRONMENT 400 TO 600 LUX 4 1 12 CRT FACE TO EAST 4 2 CRT SPECIFICATION ITEM SPEC SIZE 19 DIAGONAL 18 DEFLECTION 90 PERSISTENCE MEDIUM...

Page 9: ...NEARITY 12 x 10 INPUT SIGNAL BLOCK PATTERN V LINEARITY Xmax Xmax Ymax Ymax Xmin Ymin Ymin Xmin X 100 H LINEARITY X 100 4 4 WORSE CASE 5 4 7 PICTURE DISTORTION 4 7 1 TRAPEZOID PARALLELOGRAM 4 7 2 PINCU...

Page 10: ...020 Y 0 359 0 020 PICTURE 357mm 268mm ZONE A 0 25mm ZONE B 0 30mm B ZONE C 0 35mm C A 4 11 2 COLOR PURITY IMPURITY SHOULD NOT APPEAR IN THE PATTERN OF ALL GREEN ALL RED ALL BLUE OR ALL WHITE 4 11 3 CO...

Page 11: ...13 1 75 MAXIMUM BETWEEN CENTER TO ANY EIGHT POINTS WITHIN THE DISPLAY PICTURE FULL WHITE PATTERN 4 14 SIZE REGULATION 4 14 1 STATIC REGULATION PICTURE GROWTH FROM MINIMUM LIGHT OUTPUT TO MAXIMUM LIGHT...

Page 12: ...HEIGHT WEAK CORNER 3 EDGES 6 FACES 1 TIME ON EACH TESTED UNIT 4 SETS MIN DROP QTY 5 5 ALTITUDE OPERATING 0 3000 METERS NON OPERATING 0 12000 METERS 6 PHYSICAL SPECIFICATION 6 1 DIMENSION HEIGHT 457 m...

Page 13: ...TIBLE H V COMPOSITA SYNC LOW 0 0V MIN 0 65V MAX HIGH 1 2 40V MIN 3 5V NOM 5 5V MAX TIMING OF INPUT SIGNALS A H TOTAL TIME O V TOTAL TIME B H SYNC PULSE WIDTH P V SYNC PULSE WIDTH C H BACK PORCH Q V BA...

Page 14: ...2 222 80 3 232 160 2 460 160 2 702 152 2 235 176 D H ACTIVE US PIXELS 25 422 640 25 422 640 17 778 640 16 162 800 15 75 1024 14 222 800 13 003 1024 E H FRONT PORCH US PIXELS 0 636 16 0 318 8 1 556 56...

Page 15: ...201 208 1 837 248 1 877 304 3 175 96 3 911 224 2 20 176 D H ACTIVE US PIXELS 10 836 1024 9 481 1280 9 877 1600 21 164 640 14 528 832 12 8 1024 E H FRONT PORCH US PIXELS 0 0 0 119 16 0 395 64 2 116 64...

Page 16: ...20 20 20 20 00 05 ___________________ _______________________________ EDID DATA for LG CRT TIME 09 45 14 DATE FEB 12 2004 VIEWSONIC CORPORATION EDID VERSION 1 REVISION 3 DDCTEST FOR VIEWSONIC A91F 12...

Page 17: ...wer switch Soft power control Function select button Adjustment control button Control name 1 Power switch Push on push off switch for soft power control 2 LED indication Status LED Power on Green Off...

Page 18: ...immediately Function select buttons Adjustment control buttons Power switch a b c d Power ON indication 1 2 1 2 B OSD on screen display function control method Main menu Part 1 1 Contrast Brightness...

Page 19: ...down moves the screen image up PINCUSHION straightens the vertical sides of the screen image by curving them inward or out ward curves the vertical edges inward curves the vertical edges outward PIN B...

Page 20: ...E V I E W M E T E R M E M O R Y R E C A L L E X I T 1 S E L E C T 2 OSD OSD DEGAUSS manual degauss function Press button to active manual degauss function H MOIRE reduces vertical interference that c...

Page 21: ...ating in a factory preset mode If you make an adjustment you don t like press button to recall factory setting DIAGNOSTIC MESSAGE 1 If monitor into DPMS mode will show Display Time 5 seconds Back grou...

Page 22: ...dary Each raw of DC voltage output from T101 a TP201 voltage output from T101 pin9 and is rectified by D202 C201 b TP202 voltage output from T101 pin14 and is rectified by D203 D214 C202 c TP203 volta...

Page 23: ...in1and pin7 b IC401 pin3 pin7 outputs to vertical hold in range is controlled by pin22 C440 2 1 3 B control Take a pulse from T403 pin2 and accumulates to become a DC voltage via Q409 Q401 Q402 R418 a...

Page 24: ...output circuit Horizontal output circuit is composed by Q407 Horizontal Transistor CRT YOKE D406 C418 and C419 H output circuit H Driver circuit output via T4401to switch Q407 ON OFF to output saw too...

Page 25: ...be low enough to turn on Q4406 then the voltage of pin12 of IC601 will be pulled down accordingly to reduce the video preamplifier gain output 4 4 Brightness Control Brightness is controlled by varyi...

Page 26: ...Low to Hi and active Mute function Normal Active Mute L H SUS H L Off mode PD H L Off mode IC301 pin17 SUS function as LED control the mode is as listed Power On Power saving Over range freq Pin17 Hi...

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Page 37: ...en proper alignment is completed 8 The monitor is not required to meet specs during the following but must tolerate without damage to the CRT or circuits any sequence or combination of power on and of...

Page 38: ...0FL adjust screen just raster visible 3 1 3 Adjust VR401 to center raster on screen such that the horizontal distance from the midpoint of the left display edge to the left bezel edge is within 2mm of...

Page 39: ...allelogram distortion trapezoid parallelogram 1 5mm 3 4 4 Rotate adjustment A A B B C C D D Pinchshion 1mm A B C D Barrel 1mm A B C D Pincushion Barrel distortion 2mm 2mm 2mm Picture 2mm 264mm 352mm T...

Page 40: ...Apply 70mmx70mm green window pattern adjust G Driver to obtain green window pattern light O P about 32 FL 6500 K 5000 K 4 8 Apply white window pattern adjust R Driver B Driver to meet following chroma...

Page 41: ...C PCB defined 38 ViewSonic Corporation Confidential Do Not Copy A91f 1...

Page 42: ...adjustment data 2 9 Save geometry Save geometry adjustment data 2 10 Save all preset mode Save adjustment data to E2 PROM 2 11 Reset Monitor Reset H Position V Size Parallel Contrast Brightness R Driv...

Page 43: ...Pull adjust 255 0 Save color to 9300K Save color to 6500K Save color to 5000K Save geometry All mode adjust finish Save all preset mode Yes No Yes Initial OK No Get mode data Change other mode 40 View...

Page 44: ...Press Power on key Set burn in flag d Press Power on key All mode recall PC Pattern Generator Monitor Signal cable H V SYNC Video Output Input H V SYNC Video Initial data Adjustment data Initial data...

Page 45: ...n c t i o n 2 S e l e c t f u n c t i o n O S D V P O S I T I ON O S D H P O S I T I ON S I S AV E G E OME T RY S 9 S AV E 9 3 0 0 S 6 S AV E 6 5 0 0 C ON T R A S T B R I GH T N E S S H P O S I T I O...

Page 46: ...the power indictor LED light once and the go out Check horizontal circuit and power on again Is the power indicator LED light normally Check vertical circuit and power on again Is the LED normal Chec...

Page 47: ...s the waveform of Q401 BASE normal Is the horizontal output circut normal Is the voltage on terminal TP201 75V Check power supply circuit Check H sync input Q402 is defective Horizontal drive is defec...

Page 48: ...n the FBT screen clockwise FBT is defective R4444 D4410 are defective Is the voltage at the heater pin10 of CRT socket normal D206 Q208 R226 are defective Heater voltage approx 6 3V Bright circuit Q44...

Page 49: ...Yoke Is the waveform at pin5 of IC501 normal R502 is defective Check V sync of IC301 pin32 or signal cable Is the IC501 pin2 13V pin4 11V Is the waveform of IC401 pin21 pin23 normal Are R502 normal C...

Page 50: ...e raster don t appear Check the signal cable or computer IC601 its buffer or its drive circuit clamping pulse blanking pulse is defective Video optput circuit defective IC603 pin1 pin2 pin3 CRT drive...

Page 51: ...ERT DEFLECTION SIP 10P IC501 KA2142 4 weeks 12 E IC 0401 2947 2530209026 IC MASK OSD CONTROLLER SKINNY 28P IC601 NT6813K 28 30001 4 weeks 13 E IC 0401 2556 2500113511 IC MONO TRIPLE 7 5nS CRT DRIVER T...

Page 52: ...N A 4020363808 PLASTIC ABS 94V0 EP32 AF 312 AF 312 EP32 0 42 N A 4020363809 PLASTIC ABS 94V0 EP32 VH 0810 VH 0810 EP32 0 43 N A 4020363814 PLASTIC ABS 94V0 EP32 PA 765A PA 765A EP32 0 002 44 N A 4020...

Page 53: ...123 E R 0405 5738 13363800 RES CF 1 4W 36K J SMALL R513 RD16ST52 36K J 1 124 E R 0405 5826 13392800 RES CF 1 4W 3 9K J SMALL R446 RD16ST52 3 9K 1 125 E R 0405 5742 13394800 RES CF 1 4W 390K J SMALL R6...

Page 54: ...SE TSC 4A 250V UL SEM PIG F101 0215004 MRET5 1 212 E FS 0410 0098 805340704 FUSE TSC 4A 250V UL SEM PIG F101 181 4A 19265 0 213 M MS 0808 7471 900030118 RES PTC R 8 OHM 20 27A 2P PTC101 DGC2R08M 1 214...

Page 55: ...0MT 0 292 E C 0404 4041 142162201200S CAP AL 50V 22U M 5 12 TP5 C114 C432 0110050226VM4 0 293 N A 142162201500 CAP AL 50V 22U M 5 11 TP5 C114 C432 UVR1H220MT 2 294 E C 0404 4942 142162281200S CAP AL 5...

Page 56: ...744 201311080023 DIO FRD 2A 300V DO 204AC DO 15 50 D204 EGP20F 1 377 E D 0403 2025 201330630007 DIO FRD 1A 1000V SOD57 75nS D202 BYV26E 133 0 378 E D 0403 0832 202300290105 DIO SBD 1A 20V CASE59 04 DO...

Page 57: ...125 4120503600 CORE FERI EE19 2F8 U2200 EE19 2F8 0 459 E L 0407 1127 4120504700 CORE FERI EE19 TP3 UI 2500 EE19 TP3 1 460 E L 0407 1128 4120505000 CORE FERI EE19 PM7 UI 2400 EE1916 PM7 0 461 N A 41205...

Page 58: ...FERI SP24 TL7 UI 7000 ET24 TL7 1 547 N A 2836046100 3132010300 4157031500 ASS Y 1 548 M MS 0808 5085 3132010300 BOBBIN PBT 94V 0 2 549 E L 0407 1445 4157031500 CORE FERI SP24 JFH2 SP24 JFH2 1 550 M MS...

Page 59: ...8 M MS 0808 7311 3341159002 HSK AL T 2 5 85 47 I HS101 1 619 N A 3342603800 HSK PLATE AL1100F PICKLING T2 187 1 620 N A 3342700305 HSK AL T 1 84 5 35 I HS601 1 621 M MS 0808 8237 3350141100 RIVET BRAS...

Page 60: ...57 ViewSonic Corporation Confidential Do Not Copy A91f 1 8 Exploded Diagram And Spare Parts List...

Page 61: ...AT 17 M SW 0815 0176 3000091816 SWITCH TACTILE DC 12V 50mA 18 E D 0403 1199 2300062706 LED 5mm ORG GRN 3PIN 19 M MS 0808 4828 3360053201 LED HOLDER NY66 NAT 20 M SW 0815 0164 3000140426 SWITCH PUSH SP...

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Page 83: ...ng A91f 1 Service Manual m e t I t n e l l e c x E d o o G r i a F d a B 1 2 3 t i n U r i a F d a B in the USA at facsimile 1 909 839 7943 You may also e mail any suggestions to the Director Quality...

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