Service Manual
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Rev. 1- April 2001) ViewSonic® 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 [ Service Manual, ViewSonic VA550 Model No. VLCDS21457-3 15" Color TFT LCD Display 50 VioewnStoon..ic ViewSonk rrii ------' iri, it, im____ 1 ---------- 4-----Th (VA550_SM_282 -
Rev. 1- April 2001) ViewSonic® 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583 [ Service Manual, ViewSonic VA550 Model No. VLCDS21457-3 15" Color TFT LCD Display 50 VioewnStoon..ic ViewSonk rrii ------' iri, it, im____ 1 ---------- 4-----Th (VA550_SM_282 -
Service Manual
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...); Service Manual VA550 ViewSonic Corporation IBM and IBM products are registered trademarks of Apple Computer, Inc. SAFETY CAUTION Use a power cable that meets the local safety standards. Always use a grounded power supply cord and the provided shielded video interface cable with regard to provide reasonable protection against harmful interference in a particular installation. DO NOT COPY VESA, EDID, DPMS and DDC are designed to "Electromagnetic compatibility." FCC...
...); Service Manual VA550 ViewSonic Corporation IBM and IBM products are registered trademarks of Apple Computer, Inc. SAFETY CAUTION Use a power cable that meets the local safety standards. Always use a grounded power supply cord and the provided shielded video interface cable with regard to provide reasonable protection against harmful interference in a particular installation. DO NOT COPY VESA, EDID, DPMS and DDC are designed to "Electromagnetic compatibility." FCC...
Service Manual
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...' Mode. 4. Color; MISC and Exit. 2. Power Supply Support Ability to default settings. Help menu contains: Auto-Sync; OSD V-Pos; CONFIDENTIAL- LCD Adjust; DO NOT COPY Page 3 Power Saving System This environmentally friendly product is a TFT LCD analog display that contains the following features. 1. Brightness; OSD H-Pos; ViewSonic Corporation FEATURES Service Manual VA550 The VA550 is able to XGA, where Horizontal frequency ranges from 30-62kHz and Vertical frequency ranges from 50-75 Hz. Contrast; Frequency Range Monitor can define display mode or reset to...
...' Mode. 4. Color; MISC and Exit. 2. Power Supply Support Ability to default settings. Help menu contains: Auto-Sync; OSD V-Pos; CONFIDENTIAL- LCD Adjust; DO NOT COPY Page 3 Power Saving System This environmentally friendly product is a TFT LCD analog display that contains the following features. 1. Brightness; OSD H-Pos; ViewSonic Corporation FEATURES Service Manual VA550 The VA550 is able to XGA, where Horizontal frequency ranges from 30-62kHz and Vertical frequency ranges from 50-75 Hz. Contrast; Frequency Range Monitor can define display mode or reset to...
Service Manual
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... COPY Service Manual VA550 SPECIFICATIONS ViewSonic Corporation Characteristic LCD Panel Maximum Viewing Angles Signal Input Connector Maximum Resolution Video Bandwidth Display Area Power Voltage Power Consumption Operating Conditions Storage Conditions Dimensions Weight Description ADI, 15.0 inch diagonal viewable screen, Anti-glare TFT Active Matrix Panel, 0.297 mm pixel pitch, TDK Inverter Left : 60° Right : 60° Up : 45° Down : 55° Video : RGB analog, 0.7 Vp-p, 75 ohms Sync : HN separate or composite sync, TTL Horizontal...
... COPY Service Manual VA550 SPECIFICATIONS ViewSonic Corporation Characteristic LCD Panel Maximum Viewing Angles Signal Input Connector Maximum Resolution Video Bandwidth Display Area Power Voltage Power Consumption Operating Conditions Storage Conditions Dimensions Weight Description ADI, 15.0 inch diagonal viewable screen, Anti-glare TFT Active Matrix Panel, 0.297 mm pixel pitch, TDK Inverter Left : 60° Right : 60° Up : 45° Down : 55° Video : RGB analog, 0.7 Vp-p, 75 ohms Sync : HN separate or composite sync, TTL Horizontal...
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Function Auto Sync Contrast Brightness OSD H-POS OSD V-POS Color LCD Adjust MISC Exit Sub-Function Preset 1 Preset 2 Red Green Blue H Size H Position V Position Fine Tune Auto sync Invisible Smoothing Information Language Recall Main menu Value 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 ON/OFF ON/OFF CONFIDENTIAL - Power, Function, Select (+), Select (-), and Auto. DO NOT COPY Page 5 ViewSonic Corporation ON SCREEN DISPLAY Service Manual VA550 OSD (On Screen Display) function is supported on the TFT LCD analog display and is controlled ...
Function Auto Sync Contrast Brightness OSD H-POS OSD V-POS Color LCD Adjust MISC Exit Sub-Function Preset 1 Preset 2 Red Green Blue H Size H Position V Position Fine Tune Auto sync Invisible Smoothing Information Language Recall Main menu Value 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 0 - 100 ON/OFF ON/OFF CONFIDENTIAL - Power, Function, Select (+), Select (-), and Auto. DO NOT COPY Page 5 ViewSonic Corporation ON SCREEN DISPLAY Service Manual VA550 OSD (On Screen Display) function is supported on the TFT LCD analog display and is controlled ...
Service Manual
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DO NOT COPY Page 7 ""\ 0 60 • • O • 0 11 15 CONFIDENTIAL - ViewSonic Corporation PIN ASSIGNMENT Service Manual VA550 The TFT LCD analog display uses a 15 Pin Mini D-Sub connector as video input source. Pin Description 1 Red 2 Green 3 Blue 4 Ground 5 Ground 6 R-Ground 7 G-Ground 8 B-Ground 9 No Connection 10 Ground 11 No Connection 12 (SDA) 13 H-Sync (Composite Sync) 14 V-Sync 15 (SCL) I 4,5 1 -
DO NOT COPY Page 7 ""\ 0 60 • • O • 0 11 15 CONFIDENTIAL - ViewSonic Corporation PIN ASSIGNMENT Service Manual VA550 The TFT LCD analog display uses a 15 Pin Mini D-Sub connector as video input source. Pin Description 1 Red 2 Green 3 Blue 4 Ground 5 Ground 6 R-Ground 7 G-Ground 8 B-Ground 9 No Connection 10 Ground 11 No Connection 12 (SDA) 13 H-Sync (Composite Sync) 14 V-Sync 15 (SCL) I 4,5 1 -
Service Manual
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... multiple horizontal synchronous frequencies. The digital process and control system allows users to control OSD menu values to change display settings that the internal controller can use the ROM's preset information to drive the Analog Interface Controller. audio volume, contrast, brightness, color, HN position, and H size. The following sections are a breakdown of PLL's is to determine the correct power saving mode. The purpose of the two sets of the TFT LCD display control board's major functions. Upon receiving video signal input, the Analog Interface Controller (Digital Process...
... multiple horizontal synchronous frequencies. The digital process and control system allows users to control OSD menu values to change display settings that the internal controller can use the ROM's preset information to drive the Analog Interface Controller. audio volume, contrast, brightness, color, HN position, and H size. The following sections are a breakdown of PLL's is to determine the correct power saving mode. The purpose of the two sets of the TFT LCD display control board's major functions. Upon receiving video signal input, the Analog Interface Controller (Digital Process...
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Service Manual VA550 THEORY OF CIRCUIT OPERATION ViewSonic Corporation Ng 0 R73 600 R77 .0 606 012 ici5 74.14 5015 741S14 13 1014 241.021/..N.0 NG V NC VOLE VSS SDA I ." .5 NC 900 11606) 011 ...
Service Manual VA550 THEORY OF CIRCUIT OPERATION ViewSonic Corporation Ng 0 R73 600 R77 .0 606 012 ici5 74.14 5015 741S14 13 1014 241.021/..N.0 NG V NC VOLE VSS SDA I ." .5 NC 900 11606) 011 ...
Service Manual
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... storage and serial transmission of the memory array. The fine tune control is a 128x 8 bits EEPROM. In order to adjust when the using 24LC21. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 This Product supports timing from VGA to XGA, so the pixel rate is from 25 MHz to low level. Two modes of IC25, fine tune select. CONFIDENTIAL - The changed duty cycle...
... storage and serial transmission of the memory array. The fine tune control is a 128x 8 bits EEPROM. In order to adjust when the using 24LC21. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 This Product supports timing from VGA to XGA, so the pixel rate is from 25 MHz to low level. Two modes of IC25, fine tune select. CONFIDENTIAL - The changed duty cycle...
Service Manual
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r.'„^.",r" 2" EiA2E2Ei X618;832 , 8 g 62T%2RAYR g iii EEE EE ^ !'13 10.46F-E1/14 11 Oa 003 0 OHO D3O0 Mk 00.0 REE2AhliEiraEbraiiiiii; A 2 2 20 ROI ROI av 110 OE ROD ROY ROH 0041 Service Manual VA550 THEORY OF CIRCUIT OPERATION ViewSonic Corporation 1.201 RIOD 112001 OHO OV 001 45 PJO 100 0.5 051 -
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Service Manual
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.... User can be independently turned ON or OFF by external CPU. The phase calibration process can change the input mode and frequency definitions. Image interpolation and dithering. 5. OSD mixer. The output image may display some jitter and blurring during the auto-calibration process, but also to automatically scale the image to full screen and to the LCD panel based upon the timing parameter saved in order to optimize the image quality...
.... User can be independently turned ON or OFF by external CPU. The phase calibration process can change the input mode and frequency definitions. Image interpolation and dithering. 5. OSD mixer. The output image may display some jitter and blurring during the auto-calibration process, but also to automatically scale the image to full screen and to the LCD panel based upon the timing parameter saved in order to optimize the image quality...
Service Manual
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... the input mode detection & auto calibration function. Dithering The AM100 supports 16.7 million true colors for both horizontal and vertical directions. It is essential to support automatic image scaling so that the input image is equal to the value N. The ratio is implemented with the correct sequence and timing. Page 18 CONFIDENTIAL- Service Manual VA550 THEORY OF CIRCUIT OPERATION ViewSonic Corporation Image scaling The AM100 supports several different input modes...
... the input mode detection & auto calibration function. Dithering The AM100 supports 16.7 million true colors for both horizontal and vertical directions. It is essential to support automatic image scaling so that the input image is equal to the value N. The ratio is implemented with the correct sequence and timing. Page 18 CONFIDENTIAL- Service Manual VA550 THEORY OF CIRCUIT OPERATION ViewSonic Corporation Image scaling The AM100 supports several different input modes...
Service Manual
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... The maximum vertical back porch for next odd pixel multiplication CONFIDENTIAL - Maximum refresh rate 16 13AH-13BH Maximum refresh rate supported by the LCD panel If the intended maximum refresh rate is 75Hz, and the free-running clock is used here. And the free-running clock is 1MHz, then a value of 60 is used here Maximum input 8 frequency 13CH Maximum source clock rate supported by the AM100 (unit: frequency of 1000000...
... The maximum vertical back porch for next odd pixel multiplication CONFIDENTIAL - Maximum refresh rate 16 13AH-13BH Maximum refresh rate supported by the LCD panel If the intended maximum refresh rate is 75Hz, and the free-running clock is used here. And the free-running clock is 1MHz, then a value of 60 is used here Maximum input 8 frequency 13CH Maximum source clock rate supported by the AM100 (unit: frequency of 1000000...
Service Manual
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... with DDC interface. INTO/TO pins are 2 timers, 5 interrupt sources and a serial interface compatible with I2C interface. Port0, port3.3, and port3.5 port3.7 are not provided. 4. CONFIDENTIAL - The Txd/Rxd (P3./P3.1) pins are shared with display control pins. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 The MTV112E micro controller is restricted to P2.0. It includes an 8051 CPU...
... with DDC interface. INTO/TO pins are 2 timers, 5 interrupt sources and a serial interface compatible with I2C interface. Port0, port3.3, and port3.5 port3.7 are not provided. 4. CONFIDENTIAL - The Txd/Rxd (P3./P3.1) pins are shared with display control pins. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 The MTV112E micro controller is restricted to P2.0. It includes an 8051 CPU...
Service Manual
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LED 2 LED 1 Video offset control Reserve External H-Sync cutoff control Video gain control Sync on green /separate or composite select V-Sync select (VBK/external V-Sync) Free run mode enable Power of inverter on/off control Positive Power Supply CONFIDENTIAL - DO NOT COPY Page 27 "1" key Description "-" key "2" key N.C. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 PIN# 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Name D12/P2.5 D11/P2.6 D10/P2.7 STOUT/P4.2 D9 D8 D7 D6 D5 D4 D3 D2 D1 DO VDD TYPE I I I O O O _ O O O 0 O O -
LED 2 LED 1 Video offset control Reserve External H-Sync cutoff control Video gain control Sync on green /separate or composite select V-Sync select (VBK/external V-Sync) Free run mode enable Power of inverter on/off control Positive Power Supply CONFIDENTIAL - DO NOT COPY Page 27 "1" key Description "-" key "2" key N.C. ViewSonic Corporation THEORY OF CIRCUIT OPERATION Service Manual VA550 PIN# 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Name D12/P2.5 D11/P2.6 D10/P2.7 STOUT/P4.2 D9 D8 D7 D6 D5 D4 D3 D2 D1 DO VDD TYPE I I I O O O _ O O O 0 O O -
Service Manual
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...order to greatly reduce the power consumption during power saving, the circuit in power saving mode, pin 3 of IC25 will make the output of IC25. Q13, Q14, and MC14049 are two regulators that convert the 12 V to 5 V. The + 5 V source provides power to the CPU and SYNC processor, so it creates... controls the IC19 ON/OFF time to a low level. When the system enters the power saving stage, the above two power sources will turn off . The comparator of the required power for the VA550 and LCD panel. This product is in order to be isolated from other power sources....
...order to greatly reduce the power consumption during power saving, the circuit in power saving mode, pin 3 of IC25 will make the output of IC25. Q13, Q14, and MC14049 are two regulators that convert the 12 V to 5 V. The + 5 V source provides power to the CPU and SYNC processor, so it creates... controls the IC19 ON/OFF time to a low level. When the system enters the power saving stage, the above two power sources will turn off . The comparator of the required power for the VA550 and LCD panel. This product is in order to be isolated from other power sources....
Service Manual
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... 40 CONFIDENTIAL- Service Manual VA55O TROUBLE SHOOTING VIDEO DOES NOT APPEAR Start Check the LED is OK? Check the Vcc input video level (pin85,88,91) and reference voltage (pin86,89,92) of IC08 Check IC09 I (pin6), H-sync (pin17), I L Is contrast and brightnes too small Adiust contrast and brightness controls Backlight is OK ? Check IC03 (pin4, 5, 12) Check W07 is OK? Power Saving 1 N Check if the power is OK L 1 Check the video cable Y and check if the...
... 40 CONFIDENTIAL- Service Manual VA55O TROUBLE SHOOTING VIDEO DOES NOT APPEAR Start Check the LED is OK? Check the Vcc input video level (pin85,88,91) and reference voltage (pin86,89,92) of IC08 Check IC09 I (pin6), H-sync (pin17), I L Is contrast and brightnes too small Adiust contrast and brightness controls Backlight is OK ? Check IC03 (pin4, 5, 12) Check W07 is OK? Power Saving 1 N Check if the power is OK L 1 Check the video cable Y and check if the...
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Y N Check IC31 pin3, 8, 2, 36 Is IC08 input R,G,B is correctly Check PR15-PR26, PR01PR12, W07 and FPCB Y END CONFIDENTIAL - N Check W01 connector Is IC31 output signal OK ? Adiust color value Is main board input signal OK ? DO NOT COPY Page 41 ViewSonic Corporation TROUBLE SHOOTING Service Manual VA550 THE LCD DISPLAY HAS NO RESPONSE AND THE LED IS NOT LIT Start Is input signal OK ? ► Check video cable Is color value correct ?
Y N Check IC31 pin3, 8, 2, 36 Is IC08 input R,G,B is correctly Check PR15-PR26, PR01PR12, W07 and FPCB Y END CONFIDENTIAL - N Check W01 connector Is IC31 output signal OK ? Adiust color value Is main board input signal OK ? DO NOT COPY Page 41 ViewSonic Corporation TROUBLE SHOOTING Service Manual VA550 THE LCD DISPLAY HAS NO RESPONSE AND THE LED IS NOT LIT Start Is input signal OK ? ► Check video cable Is color value correct ?
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ETC. Service Manual VA550 TROUBLE SHOOTING ViewSonic Corporation WRONG DISPLAY IMAGE (WRONG COLOR, WHITE, SPLIT IMAGE, PICTURE RUNS... Start Is picture ">>" or "
ETC. Service Manual VA550 TROUBLE SHOOTING ViewSonic Corporation WRONG DISPLAY IMAGE (WRONG COLOR, WHITE, SPLIT IMAGE, PICTURE RUNS... Start Is picture ">>" or "
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...; e° O. 0. ° o „, ° 0 O. 0 0.. SCREW-MBSFW M3.0*10.0L,Zn 36 M-SCW-0824-0365 MAC. Yd Nv 1502-3410-00t2 Mt 94650 PR IWO 6 . U DESCRIPTION V 1 DE1 DATE ITEM ViewSonic P/N DESCRIPTION 1 C-FP-0301-0738 FRONT PANEL CAB.(VA550) 2 M-MS-0808-4713 LED LENS (VG150) 3 PL-BT-0706-0076 BUTTON (VA550) 4 M-LCD-0826-0021 LCD MODULE 15.0' TFT AA150XA03 (ADI) 5 M-MS-0808-3957...
...; e° O. 0. ° o „, ° 0 O. 0 0.. SCREW-MBSFW M3.0*10.0L,Zn 36 M-SCW-0824-0365 MAC. Yd Nv 1502-3410-00t2 Mt 94650 PR IWO 6 . U DESCRIPTION V 1 DE1 DATE ITEM ViewSonic P/N DESCRIPTION 1 C-FP-0301-0738 FRONT PANEL CAB.(VA550) 2 M-MS-0808-4713 LED LENS (VG150) 3 PL-BT-0706-0076 BUTTON (VA550) 4 M-LCD-0826-0021 LCD MODULE 15.0' TFT AA150XA03 (ADI) 5 M-MS-0808-3957...