Service Manual ViewSonic VA903b-3 VA903m-3 Model No. VS11372 19” Color TFT LCD Display (VA903b-1_ VA903m-1_SM Rev. 1a Sep.
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TABLE OF CONTENTS 1. Precautions and Safety Notices 1 2. Specification 4 3. Front Panel Function Control Description 13 4. Circuit Description 16 5. Adjustment Procedure 23 6. Troubleshooting Flow Chart 47 7. Recommended Spare Parts List 55 8. Exploded Diagram and Exploded Parts List 60 9. Block Diagram 65 10. Schematic Diagrams 66 11.
1. Precautions and Safety Notices 1. Please carefully read this manual before operating the device and keep it available for future reference. 2. To avoid the danger of the monitor falling and thereby possibly causing injury and/or serious damage to the monitor itself, do not place it on unstable cars or desks. Be careful to avoid placing any stress on the LCD screen during handling. 3.
Handing and Placing methods Correct methods Incorrect methods Only touch the metal frame of the LCD panel or the Surface of the LCD panel is pressed by fingers and that front cover of the monitor, DO not touch the surface may cause”mura” of the POL Take out the monitor with cushions Taking out the monitor by grasping the LCD panel, that May cause”mura” ViewSonic Corporation 2 Confidential - Do Not Copy VA903b-1_ VA903m-1
Place the monitor on a clean and soft foam pad Placing the monitor on a foreign objects, that could scratch The surface of the "Panel" or cause "mura" The panel is placed facedown the lap,that may cause "mura" ViewSonic Corporation 3 Confidential - Do Not Copy VA903b-1_ VA903m-1
2. Specification INTRODUCTION FEATURES VA903b-3 / VA903m-3 Size 19 “ 300 cd/㎡ Luminance (Typ) Contrast Ratio (Typ) st 1 TFT LCD panel 700 :1 Colors 16.2 M colors (6+2bit panel) Response Time (Typ) 8 ms Viewing Angle (H/V) 150 ° / 135 ° Recommend resolution Input Signal Sync Compatibility Compatibility Power Voltage 1280 x 1024 @60Hz Analog (75ohms, 1.
Product definition and specification Product Name VA903b-3 / VA903m-3 Model Number VS11372 Region M model for America E model for Europe G model for China P model for Asia A model for Australia S model for Singapore K model for Korea U model for UK OSD Languages English, French, German, Italian, Spanish, Finnish, Japanese, Traditional Chinese, Simplified Chinese TFT LCD Panel and Model # HSD, Model # :190ME13-A16/A10 Scalar RTD, Model # : RTD2023L Input Signal Analog Sync Compatibility Separa
GENERAL specification Test Resolution & Frequency 1280 x 1024 @ 60Hz Test Image Size Full Size Contrast and Brightness Controls Factory Default: Contrast = 70%, Brightness = 100% VIDEO INTERFACE Analog Input Connector DB-15 (Analog), refer the appendix A Default Input Connector Defaults to the first detected input Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes Video Cable Connector DB-15 Pin out Compliant DDC 2B Video Signals Video RGB (Analog), Separate
Power Supply Transient Immunity Power Supply Line Surge Immunity SHALL BE ABLE TO WITHSTAND AN ANSI/IEEE C62.41-1980 6000V 200 AMPERE RING WAVE TRANSIENT TEST WITH NO DAMAGE Shall be able to withstand 1.
12 800 x 600 @ 75Hz, 46.9kHz Yes 13 800 x 600 @ 85Hz, 53.7kHz Yes 14 MAC 832 x 624 @ 75Hz, 49.7kHz Yes 15 1024 x 768 @ 60Hz, 48.4kHz Yes 16 1024 x 768 @ 70Hz, 56.5kHz Yes 17 1024 x 768 @ 72Hz, 58.1kHz Yes 18 1024 x 768 @ 75Hz, 60.0kHz Yes 19 1024 x 768 @ 85Hz, 68.67KHZ Yes 20 1152 x 864 @ 75Hz, 67.5KHZ Yes 21 MAC 1152x870@75HZ, 68.68KHZ Yes 22 1280 x 960 @ 60Hz, 44.93KHZ Yes 23 1280 x 960 @75Hz, 56.25KHZ Yes 24 1280 x 1024 @ 60Hz, 63.
AUDIO INTERFACE (SPEAKER SPECIFICATION) (For VA903m-3 only) Line input connection 3.5 mm stereo jack Line input signal 1.0Vrms Line input impedance Maximum power output (Electric) >10 kOhm 1 W @ <15% DISTORTION Signal to Noise Ratio 50 dB Frequency response 200 Hz – 20 Khz Distortion <15% THD (@1kHz) Vibration There should be no audible vibration with volume at 100%. (Input signal within 1.
IMAGE PERFORMANCE Display Size Horizontal Display Size, Primary Preset FULL SCREEN Vertical Display Size, Primary Preset FULL SCREEN Luminance Lv (Max) –Condition: Brightness / Contrast = 100% CCT = USER COLOR (R/G/B=100%) Lv (Max) = The Luminance requirement of section 4-6 “TFT LCD PANEL” Lv (6500Kf) –Condition: Brightness / Contrast = Default Lv (6500K) / Lv (Max) x 100% ≧ 85% Color Temperature = 6500K Lv (sRGB) –Condition: Brightness / Contrast = Default Lv (sRGB) / Lv (Max) x 100% ≧85% CCT =s
Contrast = 100% Brightness = 100% Input signal level = 720mV Test pattern = 64-gray 8~10 VISIBLE SATURATION Preset Color Temperatures sRGB It should meet IEC 61966-2-1 (1999-10) standard. Preset 1 CCT (typ) = 9300K (u’CCT=0.1888; v’ CCT=0.4457) CCT (max) = 10250K, CCT (min) = 8500K Δu’v’<0.01 (@ Full White pattern) Preset 2 (Primary) CCT (typ) = 6500K (u’CCT=0.1978; v’ CCT=0.4684) CCT (max) = 6950K, CCT (min) = 6100K Δu’v’<0.01 (@ Full White pattern) Preset 3 CCT (typ) = 5400K (u’CCT=0.
MECHANICAL Dimension Dimension (Desktop) Width 416mm Height (Height adjust to the bottom) 429mm Depth 210mm Monitor Weight 4.6KG / 10.12lb *Refer to Figure 1 Dimension (Head Only / Wall Mount) Width 416mm Height 364mm Depth 68mm Monitor Weight 4.2KG / 9.25lb *Refer to Figure 1 Ergonomics Tilt Up step 1 0° TO 20.
3. FRONT PANEL CONTROLS AND INDICATORS Short Cuts Function from the button(s) [1] [2] [▼] or [▲] [▼]+ [▲] [1] + [2] Main Menu Auto Image Adjust To immediately activate Contrast menu.
Function descriptions OSD Lock short cuts function for the buttons The OSD lock will be activated by pressing the front panel control buttons "(1), & (▲)" for 10 seconds. If the user then tries to access the OSD by pressing any of the buttons "1", "▼", "▲", "2" a message will appear on the screen for 3 seconds showing "OSD Locked". The OSD lock will be deactivated by pressing the front panel control buttons "(1), & (▲)" again for 10 seconds.
Factory Defaults Item Defaults Item Defaults Contrast 70% Volume 50% (For VA903m-3 only) Brightness 100% Balance N/A Color Temperature 6500K Treble N/A Sharpness 0% Bass N/A OSD H. Position 50% 720x400/640x400 720x400 OSD V.
4. Circuit Description A. AC-DC CONVERTER The power supply with a high-integrated green-mode PWM controller provides several features to enhance the performance of power flyback converters. U801 is a PWM controller and provides many protection functions. U802 is a photo couple to transfer the feedback signal from the second side which U803 detected both of the output DC voltage on 5V and 24V.
REDADC_GND ADC_GND ADC_VDD AHS AI AG AG AP AI 38 39 40 41 42 Analog input ground from RED channel Analog ground Analog ground Analog power Analog HS input (3.
53 S[1] / S[1] / S[1] / S[1]/ BBLU[0] S[1] / TCON[4] TCON[4] TCON[4] / TCON[4] TCON[4] 2mA PWM2 / PWM2 / PWM2 / PWM2 / PWM2 / (1), (2), (3)/ COUT / COUT / COUT / COUT / COUT / 2mA TCON[13] TCON[13] TCON[13] TCON[13] TCON[13] 59 BB3P BB3P NC BBLU [7] BBLU [7] 60 BB3N BB3N NC BBLU [6] BBLU [6] 61 BB2P BB2P NC BBLU [5] BBLU [5] 62 BB2N BB2N NC BBLU [4] BBLU [4] 63 BB1P BB1P NC BBLU [3]/T0 BBLU [3] 64 BB1N BB1N NC BBLU [2]/T1 BBLU [2] 65 BCLKP B
104 AR3N TCON [6] NC ARED [6]/T29 ARED [6] 105 AR2P TCON [5] NC ARED [5]/TH ARED [5] 106 AR2N TCON [1] NC ARED [4]/TV ARED [4] 107 AR1P TCON [0] NC ARED [3]/TE ARED [3] 108 AR1N NC NC ARED [2]/TK ARED [2] 113 PWM2 / PWM2 / PWM2 / ARED [1] PWM2 / COUT / COUT / COUT / COUT / TCON[12] TCON[12] TCON[12] TCON[12] TCON [11] V [0] V [0] ARED [0] TCON [11] (1), (7), (8) V [1] V [1] BRED [1] TCON [10] (1), (7), (8) V [2] V [2] BRED [0] TCON [9] (1), (7), (8)
TMDS_VDD P 19 (3.3V) RX0P I 20 Differential Data Input RX0N I 21 Differential Data Input TMDS_GND G 22 RXCP I 23 Differential Data Input RXCN I 24 Differential Data Input TMDS_GND G 25 TMDS_VDD P 26 (3.3V) PWM Interface: 3-2=1 pin (PWM1, PWM2 can be selected from 1 of 3 possible pins.
3.3V Ground G 48,120 GNDIO: 2 3.3V Power P 58,71,83,95,110 PVCC: 5 3.3V Ground G 57,72,84,96,109 PGND: 5 2.5V Power P 45,69,98,127 VCCK: 4 2.5V Ground G 44,70,97,128 GNDIK: 4 Note: (1) TTL compatible CMOS Input (Vt=1.7V); VCC=3.3V; (2) 5V tolerance pad; (3) Internal 75K Ohms pull high resistor. (4) Internal 75K Ohms pull low resistor. (5) Schmitt trigger CMOS Input (Vt=1.4-~2.2V); (6) Open-Drain, Output Drive low & Pull-high.
AC output. The output stage consists of a tuning capacitor, transformer, and push-pull MOSFET pair to boost AC output up to hundreds of voltage peak to peak. And one resister is serial to lamp for output voltage feedback. There are two signals which control the inverter come from system to turn on the inverter and control brightness. Logic “low” level which send to U901 is turn on the inverter. BL-ADJ signal control brightness by DC level which was integral from PWM signal.
5. Adjusting Procedure 1. Function test 1.1 products 19” LCD Monitor 1.2 test equipment Color video Signal& pattern (Or PC with SXGA resolution and a sound card) 1.3 Test Condition Before function test and alignment ,each LCD Monitor should be warmed up at least 30 minutes with the following conditions: A: in roon temperature B with full white screen ,RGB ,and black C. with cycled display model: 1280 x 1024 @ 60Hz 1.4 Test display& Pattern 1.4.
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Firmware Update Procedure 1. The monitor’s firmware update for VA903m/b have two method. Download the MCU IC by the fire machine. This procedure is finished in SMT. ISP Method. When the monitor’s BIOS isn’t exist or firmware isn’t final program, this method Is worked by ISP Cord with monitor. 2. VA903m/b monitor upgrade firmware by ISP Cord.
LPT Cable AC power Cable VGA Cable ISP3.0 SOFT USB FOR PRINT 2.2. Setup Procedure 2.2.1 Connect PO1 of ISP fixture with print port of computer by LPT cable 2.2.2 Connect PO2 of ISP fixture with USB port of computer by USB cable 2.2.3 Connect PO3 of ISP fixture with monitor VGA port by VGA cable 2.2.4 Connect mouse, keyboard, AC power, monitor with computer 2.2.5 Plug AC cable in power adapter AC jack 2.2.6 Connect power adapter DC_OUTPUT port to main board DC_IN port 2.2.
PO2 to USB cable jumper PO1 to LPT cable PO3 to VGA cable AC JACK DC_IN port VGA port NOTE: Do STEP2.2.6 and STEP2.2.7 for monitor’s main board only. Monitor firmware upgrade will jump this step.
2.3. Soft install Install ISP3.0 program by selecting and clicking “…\isp3.0\setup.exe”, press “YES” or “NEXT” buttons until setup is complete.
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Installation will create a icon for ISP application in “START MENU”\PROGRAM Press “finish” button exit setup ViewSonic Corporation 32 Confidential - Do Not Copy VA903b-1_ VA903m-1
STEP1: Choose the DCC written Program set up the DCC written fixture ,check whether the connection between main board is in well condition ,see attached file 1.1&1.
STEP2: Creat security file Choose the Tab "create Security File " to enter next Dialogue Item ViewSonic Corporation 34 Confidential - Do Not Copy VA903b-1_ VA903m-1
STEP3: Input the related parameter, save them and take up the next step STEP4: Choose the Tab MTV TYPE Choose the MTV512M64 from the TAB ISP ITEMS DCC Written model Diagram Table as below ViewSonic Corporation 35 Confidential - Do Not Copy VA903b-1_ VA903m-1
STEP5: DCC WRITTEN methods ViewSonic Corporation 36 Confidential - Do Not Copy VA903b-1_ VA903m-1
SETP6: Choose the DDC Written BIOS document Choose the Tab LOAD MCU FILE，Looking up the related BIOS document in my Computer ,and Point the confirm Tab when the BIOS Documents' loading is successful ,you can find the picture as above ViewSonic Corporation 37 Confidential - Do Not Copy VA903b-1_ VA903m-1
Step 7.
The normal program is writing The program has finished writing ViewSonic Corporation 39 Confidential - Do Not Copy VA903b-1_ VA903m-1
Disassembly Procedure 1. Remove the hinge cover 2. Unscrew the back cover’s screw 3.
4. Tear off the aluminum foil where fix up the light 5. Tear off the aluminum foil where cover the FFC cable,take out the key board from bezel ,pull out FFC cable from the main board; 6.
7. pull out the two screws where lie in the two sides of the frame 8. pull out the screws which fix up the bezel and then take out the bezel 9.
10. pull out the lamp wire material 11. take out the screw form the power board ,pull out the power boards’ connecter wire 12.
13. take out the main board’s screw 14.
Packing Procedure 1.1 Paste production film to protect the monitor screen.(Figure 1) tape Production film 1.2 Put the monitor in the PE bag and seal bag with type (Figure 2) tape 1.3 Put the cushions on the monitor.
1.4 Put the base in the EPE bag. and then,place the base on the cushions ,as figure; 1.4.Place the monitor into the carton and then put all accessories into carton .At last,close the carton.
6. Troubleshooting Flow Chart Main Procedure Start Connect all of devices to the LCD monitor Power On Is indicator LED light? No A.
1 Is backlight on? No B. Backlight Troubleshooting Yes Display Performance O.K.? No C. Performance Troubleshooting No D. Function Troubleshooting No E. Audio Troubleshooting Yes Function Adjustment O.K.? Yes Audio Function O.K.
A.
B.
C.
2 Screen with noise or line bar? Yes Prss Reset Button from front panel control Yes End No Change Main Board No Screen is smaller? Yes Make sure relution is set at default No Yes Reset O.K.
D.
E. Audio Troubleshooting Start Make sure sound output, Audio cable is OK.
7. Recommended Spare Parts List RECOMMENDED SPARE PARTS LIST (VA903m-3) ViewSonic Model Number: VS11372 Rev: 1b Serial No. Prefix: QAV Item 1 2 3 4 6 8 9 10 11 12 13 14 15 16 17 18 Accessories: PC Board Assembly: Cabinets: Cables: Electronic Components: Hardware: Packing Material: Description Power Cord Main Board - LM/MR19I-AAA Key Board - SVA Inverter Board + Power Board Rev.
BOM LIST (VA903m-3) ViewSonic Model Number: VS11372 Rev: 1b Serial No. Prefix: QAV Item 1 2 ViewSonic P/N N/A N/A Ref. P/N E015-006-W E015-016-1-W 3 E-00008009 E34862190H304 4 N/A F0004191AK001 5 N/A F0010171A3001 6 N/A F001217043001 Explanation card LM/LM1704 ENGLISH L210*W148mm for Viewsonic REV:0 7 N/A F101415170401 MARK LM/LM1704 L11*W11mm energy star 8 N/A F102506191A04 Safety Label LM/MR19I-AAA L89.5*W49.
Item 66 67 68 69 70 71 72 73 74 75 76 77 ViewSonic P/N N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Ref.
BOM LIST (VA903b-3) ViewSonic Model Number: VS11372 Rev: 1b Serial No. Prefix: QAU Item 1 2 ViewSonic P/N N/A N/A Ref.
Item ViewSonic P/N Ref.
8.
EXPLODED PARTS LIST (VA903b-3 ) ViewSonic Model Number: VS11372 Rev: 1a Item 1 2 3 4 5 6 ViewSonic P/N N/A N/A N/A PL-00006589 B-00006502 N/A Ref.
EXPLODED PARTS LIST (VA903m-3 ) ViewSonic Model Number: VS11372 Rev: 1a Item 1 2 3 4 5 6 ViewSonic P/N N/A N/A N/A PL-00006589 B-00006502 N/A Ref.
PACKING FOR SHIPPING ViewSonic Corporation 63 Confidential - Do Not Copy VA903b-1_ VA903m-1
PACKING PARTS LIST (VA903b-3 ) ViewSonic Model Number: VS11372 Rev: 1a Item 1 ViewSonic P/N N/A Ref. P/N F300270000037 2 P-00008073 F4007K4191A01 3 P-00008071 F20133191A002 4 5 6 7 A-00006505 CB-00005758 N/A F20143191A002 W402221509531 W0026918A0142 W0926417AQ951 8 9 10 11 12 N/A N/A N/A P-00006586 C-00006583 F801190000017 F300272501501 N/A F300250000070 XLM171A280003 DESCRIPTION PLASTIC BAG LDPE L700*W(500+140)*T0.
PACKING PARTS LIST (VA903m-3 ) ViewSonic Model Number: VS11372 Rev: 1a Item 1 2 3 4 5 6 7 8 9 10 11 12 ViewSonic P/N Ref. P/N N/A F300270000037 P-00008074 F4007K4191A02 P-00008071 F20133191A002 P-00008072 F20143191A002 A-00006505 CB-00005758 N/A W402221509531 W0026918A0142 W0926417AQ951 N/A F801190000017 N/A F300272501501 P-00006586 C-00008090 F300250000070 XLM171A280002 Description PLASTIC BAG LDPE L700*W(500+140)*T0.
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10. Schematic Diagrams DGND R2 NC/0 100nF + 100uF_16V BKLT-VBRI BKLT-EN 1 2 3 4 5 6 C2 5V R2 NC/0 5DVCC L1 FEB/1206 3.3V 5V R3 0/NC 5V R5 100k + C6 R4 10K 2 Q1 AO3401 3 PANEL POWER C3 22uF/16V FB1 40mil FEB/1206 PANEL_VCC C4 100nF C5 0.01uF 100uF_16V 3 CN1 2.0_11pin 40mil J1 1 C1 R6 1K U3 VIN L2 FEB/1206 VOUT 2 DGND DGND 3.3DVCC C7 1117-33/AIC1084-33 + 100uF_16V 1 GND 3 KST3904 C9 NC 2 5DVCC Q2 1 ONPANEL_5V 3.
JP5 10 9 8 7 6 5 4 3 2 1 6 5 4 3 2 1 MUTE UP DOWN EXIT MENU POWER LED-2 LED-1 1 2 3 4 5 6 HEADER 13/SM A1 HEADER 13/SM 6 5 4 3 2 1 LED1 A2 10 9 8 7 6 5 4 3 2 1 JP3 JP4 2 4 SW6 HEADER 13/SM MENU EXIT DOWN UP MUTE DGND 1 3 2 SW1 4 1 3 2 SW2 4 1 3 2 SW3 4 1 3 2 SW4 4 1 3 2 SW5 4 C 1 3 1 2 3 4 5 6 ViewSonic Corporation Model Title Date ViewSonic Corporation 67 Confidential - Do Not Copy VA903b-1_ VA903m-1 OSD Rev:
FBA2 3 FBA1 BED/6 5VA FEB/1206 5DVCC CA2 CA1 DGND 0.1uF 0.1uF AGND AGND 5VA CA13 CA11 + 100uF_16V 0.
MCU_VCC 3 R136 4.7K 2N3906 1 C122 + R139 4.7K 3.3DVCC R141 0 2 10uF_16V Q11 R138 R140 100 100 8 5 6 4 U4 5DVCCTEST SDA A2 SCL A1 GND A0 C121 100nF 7 3 2 1 X24C16 (SMD) 3 1 3.3DVCC IICSDA IICSCL R137 4.7K 2N3906 R142 4.7K D29 1N4148 1 R143 MCU_RESET 22 NC/4.7K R144 D30 4.7K 1N4148 DGND MCU_VCC DGND 1 R145 NC/4.
R24 75 C15 U1 R26 DDC1_SCL DDCSCL 15 5 10 4 9 3 8 2 7 1 6 VSIN 14 HSIN 13 DDC1_SDA DDCSDA 12 DGND 11 D4 D5 UDZ5.6B R28 DGND DGND CONNECT DGND VGA5V VGA5V_1 VGA_B+ BIN VGA_BL6 FEB_0603 VGA_G+ GIN VGA_GL7 FEB_0603 VGA_R+ RIN VGA_RL8 FEB_0603 C18 R31 R33 C22 47nF B0+ R25 100 C16 47nF B0- R27 100 C17 470nF R29 47 C19 47nF G0+ R30 100 C20 47nF G0- R32 47 C21 47nF R0+ R34 100 C23 47nF R0- C104 5pF B0SOG0 G0+ SOG0 G0- RG1 DDC1_SCL DDC1_SDA DDC1_SDA UDZ5.
L9 3.3DVCC FEB/1206 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 3.3DVCC C27 22pF XO Y1 24MHz R47 6.8KNC C29 C30 C31 100nF 100nF 100nF C32 + C33 2 XI C28 22pF RXE3+ RXE3RXEC+ RXECRXE2+ RXE2- 100nF 22uF_16V DGND RXE1+ RXE1RXE0+ RXE0RXO3+ RXO3RXOC+ RXOC- RV1 0 RXO2+ RXO2RXO1+ RXO1RXO0+ RXO0- R1.8DVCC L10 FEB/1206 1.8CC C37 R3.3DVCC 100nF C36 + 10uF_16V C38 C39 100nF 100nF C34 C35 100nF 100nF DDC1_SDA 3.3DVCC CN2 R3.
11.
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* Reader’s Response* Dear Readers: Thank you in advance for your feedback on our Service Manual, which allows continuous improvement of our products. We would appreciate your completion of the Assessment Matrix below, for return to ViewSonic Corporation. Assessment A. What do you think about the content of this Service Manual? Unit Excellent Good Fair Bad 1. Precautions and Safety Notices 2. Specification 3. Front Panel Function Control Description 4. Circuit Description 5. Adjustment Procedure 6.
