ViewSonic Vp9303 Service Manual

							
 
 
 
 
 
 
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INVERTER 
In order to drive the CCFLs embedded in the panel module, there is a half bridge inverter to convert by 
the controller. 
The input 12V up to hundreds of AC voltage output. 
The inverter is formed by symmetric in order to drive the separate lamp modules. 
The input stage consists of a PWM controller, half bridge inverter, and switching MOSFET to convert 
DC input into AC output. 
The output stage consists of a tuning capacitor, coupling capacitor, transformer, push-pull MOSFET 
pair to boost AC output up to hundreds of voltage. 
And one resister is serial to lamp for output voltage feedback. 
There are two signal to control the inverter which come from system. 
Logic “high” level which send to P106 pin6 is turn on the inverter. 
BRI signal control brightness by DC level which was integral from PWM signal. 
 
 
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5. Adjustment Procedure 
 
 
 
1. Function Test 
1.1 Product  - 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 alignmen t, each LCD Monitor should be run- in and warmed up for at least 
30 minutes with the following conditions: 
(a) In room temperature, 
(b) With full-white screen, RGB, and Black 
(c) With cycled display modes,  640*480 (H=43.27kHz, V=85Hz) 
800*600 (H=53.7kHz, V=85Hz) 
1024*768 (H=68.67kHz, V=85Hz) 
1280*1024 (H=79.97kHz, V=75Hz) 
1.4  Test Display Modes & Pattern  1.4.1 Compatible Modes 
Item Timing  Analog  Digital 
1 
640 x 350  @  70 Hz,  31.5   KHz  Yes Yes 
2 
640 x 400  @  60 Hz,  31.5   KHz  Yes Yes 
3 
640 x 400  @  70 Hz,  31.5   KHz  Yes Yes 
4 
640 x 480  @  50 Hz,  24.7   KHz  Yes Yes 
5 
640 x 480  @  60 Hz,  31.5   KHz  Yes Yes 
6 
640 x 480  @  67 Hz,  35.0   KHz  Yes Yes 
7 
640 x 480  @  72 Hz,  37.9   KHz  Yes Yes 
8 
640 x 480  @  75 Hz,  37.5   KHz  Yes Yes 
9 
640 x 480  @  85 Hz,  43.3   KHz  Yes Yes 
10 
640 x 870  @  75 Hz,  68.9   KHz  Yes Yes 
11 
720 x 400  @  70 Hz,  31.5   KHz  Yes Yes 
12 
720 x 480  @  60 Hz,  31.5   KHz  Yes Yes 
13 
720 x 576  @  50 Hz,  31.3   KHz  Yes Yes 
14 
800 x 600  @  56 Hz,  35.1   KHz  Yes Yes 
15 
800 x 600  @  60 Hz,  37.9   KHz  Yes Yes 
16 
800 x 600  @  72 Hz,  48.1   KHz  Yes Yes 
17 
800 x 600  @  75 Hz,  46.9   KHz  Yes Yes 
18 
800 x 600  @  85 Hz,  53.7   KHz  Yes Yes 
19 
832 x 624  @  75 Hz,  49.7   KHz  Yes Yes 
20 
1024 x 768  @  50 Hz,  39.6   KHz  Yes Yes 
  
						

							
 21  1024 x 768  @  60 Hz,  48.4   KHz  Yes  Yes 
22  1024 x 768  @  70 Hz,  56.5   KHz  Yes  Yes 
23  1024 x 768  @  72 Hz,  58.1   KHz  Yes  Yes 
24  1024 x 768  @  75 Hz,  60.0   KHz  Yes  Yes 
25  1024 x 768  @  75 Hz,  60.2   KHz  Yes  Yes 
26  1024 x 768  @  85 Hz,  68.7   KHz  Yes  Yes 
27  1152 x 864  @  75 Hz,  67.5   KHz  Yes  Yes 
28  1152 x 870  @  75 Hz,  68.7   KHz  Yes  Yes 
29  1280 x 720  @  50 Hz,  37.5   KHz  Yes  Yes 
30  1280 x 720  @  60 Hz,  45.0   KHz  Yes  Yes 
31  1280 x 768  @  50 Hz,  39.6   KHz  Yes  Yes 
32  1280 x 768  @  60 Hz,  47.8   KHz  Yes  Yes 
33  1280 x 768  @  75 Hz,  60.3   KHz  Yes  Yes 
34  1280 x 768  @  85 Hz,  68.6   KHz  Yes  Yes 
35  1280 x 960  @  50 Hz,  49.4   KHz  Yes  Yes 
36  1280 x 960  @  60 Hz,  59.7   KHz  Yes  Yes 
37  1280 x 960  @  75 Hz,  75.2   KHz  Yes  Yes 
38  1280 x 1024  @  50 Hz,  52.7   KHz  Yes  Yes 
39  1280 x 1024  @  60 Hz,  64.0   KHz  Yes  Yes 
40  1280 x 1024  @  75 Hz,  80.0   KHz  Yes  Yes 
          
 
 
1. Tolerance ≥ ±2KHz. 
2. Any timing not in the list, it should display as normal or show on “OUT OF RANGE” OSD 
  message without blanking. 
3. The image quality of 85Hz mode might be worse than 75Hz.
 
1.4.2  Function Test Display Pattern 
 
Item Test Content  Pattern  Specification  Remark 
1  Frequency & Tracking  Fine Line Moire  Eliminate visual wavy noise.  Figure 1 
2  Contrast/Brightness  16 Gray Scale  16 gray levels should be 
distinguishable.  Figure 2 
3 Boundary  Horizontal & 
Vertical Thickness Horizontal and Vertical position 
of video should be adjustable to  be within the screen frame.  Figure 3 
4 
RGB Color 
Performance  RGB Color 
Intensities  Contrast of each R, G, B, color 
should be normal.  Figure 4, 5, 6
5 Screen Uniformity & 
Flicker  Full White Should be compliant with the 
spec.  Figure 7 
6 Dead Pixel/Line  White Screen & 
Dark Screen  The numbers of dead pixels 
should be compliant with the  spec.  Figure 7, 8 
7 White Balance 
White & Black 
Pattern  The screen must have the pure 
white and black pattern, no 
other color.  Figure 9 
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Fine Line Morie Pattern (Figure1)       Gray Scale Pattern (Figure2) 
 
Horizontal & Vertical Thickness Pattern (Figure 3)              R. Color Pattern (Figure 4) 
 
G. Color Pattern (Figure5)                B. Color Pattern (Figure 6) 
 
 
Full White Patter (Figure 7)                Dark Screen Pattern (Figure 8) 
 
 
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Black-White Pattern (Figure 9) 
 
1.5  Function Test and Alignment Procedure 
1.5.1  All Modes Reset  You should do “All Mode Reset”  (Refer to Chapter III-3. Hot  Keys for Function Controls) 
first. This action will allow you to erase all end-user’s settings and restore the factory 
defaults. 
1.5.2  Auto Image Adjust  Please select and enter  “Auto Image Adjust ” function on Main Menu to see if it is workable. 
The  “Auto Image Adjust ” function is aimed to offer a better screen quality by built-in 
ASIC. For optimum screen quality, the user  has to adjust each function manually. 
1.5.3 Firmware  Test Pattern: Burn In Mode  (Refer to Chapter III-3. Hot Keys for Function Controls)  
- Make sure the F/W is the latest version. 
1.5.4 DDC  Test Pattern: EDID program 
- Make sure it can pass test program. 
1.5.5  Fine Tune and Sharpness  Test Signal: 1280*1024@60Hz 
Test Pattern: Line Moire Pattern 
- Check and see if the image has noise and fo cus performs well. Eliminate visual line bar. 
- If not, readjust by the following steps: 
(a) Select and enter “ Fine Tune” function on “ Manual Image Adjust ” to adjust the image 
to eliminate visual wavy noise. 
(b) Then, select and enter “ Sharpness” function to adjust the clar ity and focus of the screen 
image.  
1.5.6 Boundary  Test Signal: 1280*1024@60Hz 
Test Pattern: Horizontal & Vertical Line Thickness Pattern 
- Check and see if the image boundary is within the screen frame. 
- If not, readjust by the following steps: 
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 (a) Select and enter “
Manual Image Adjust ” function on OSD Main Menu. 
(b) Then, select and enter “ Horizontal Size” or “Horizontal/Vertical Position ” function to 
adjust the video boundary to      be full scanned and within screen frame. 
1.5.7 White Balance  Test Signal: 1280*1024@60Hz 
Test Pattern: White and Black Pattern 
1.5.8  R, G, B, Colors Contrast  Test Signal: 1280*1024@60Hz 
Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern 
- Check and see if each color is normal and distinguishable. 
- If not, please return the unit to repair area. 
1.5.9  Screen Uniformity and Flicker  Test Signal: 1280*1024@60Hz 
Test Pattern: Full White Pattern 
- Check and see if it is in normal condition. 
1.5.10  Dead Pixel and Line  Test Signal: 1280*1024@60Hz 
Test Pattern: Dark and White Screen Pattern 
- Check and see if there are dead pixels on LCD panel with shadow gauge and filter film. 
- The total numbers and distance of dead pixels should be compliant with the spec. 
1.5.11 Mura  Test Pattern: White, RGB, Black, & Grey 
Test Tool: 8% ND Filter 
- Check if the Mura can pass 8% ND Filter. 
1.5.12 Audio  Test Signal: Voice signal (optional, depend on model) 
Test Pattern: liberty 
- Make sure there is audio output. 
- Make sure that audio function (volume 80%) is working without noise ≦ and resonance. 
- Make sure that the sound of right and left speakers are in balance. 
1.5.13  Check for Secondary Display Modes    Test Signal:     
Analog: 640*350@70Hz; 640*480@60HZ  720*400@70Hz; 800*600@60HZ/70HZ/75HZ 
832*624@75Hz, 1024*768@60HZ/70HZ/75HZ 
1280*1024@60/75Hz 
Digital: 640*350@70Hz; 640*480@60HZ  720*400@70Hz; 800*600@60HZ/70HZ/75HZ 
1024*768@60/70/72/75; 1152*870@75Hz, 
       1280*1024@60Hz/75HZ 
-    Normally when the primary mode 1280*1024@60Hz is well adjusted and compliant 
with the specification, the secondary display  modes will be great possible to be compliant 
with the spec. But we still have to check with the general test pattern to make sure every 
secondary is compliant with the specification. 
1.5.14  All Modes Reset  After final QC step, we have to erase all  saved changes again and restore the factory 
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 defaults. You should do “All Mode Reset” again. 
1.5.15  Power Off Monitor  Turn off the monitor by pressing “Power” button. 
 
2.  Firmware Upgrade Procedure 
 
When you receive the returned monitor, please ch eck whether the firmware version is the latest.   
If not, please do the following procedures  to upgrade it to the latest version. 
 
2.1 Equipment Needed 
 
- VP930/B(3) Monitor 
- Fixture for Firmware Upgrade   
- VGA Cable 
- PC (Personal Computer) 
- LPT Cable   
- Firmware Upgrade Program 
- One additional monitor for checking the program execution 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
PC 
VGA Cable 
Printer Por
t 
LPT Cable 
VP930/B(3) 
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  2.2 Setup Procedure 
2.2.1 Connect P2 of Fixture with printer port of PC by LPT Cable.   
2.2.2 Connect P1 of Fixture with Monitor by VGA Cable. 
2.2.3 Connect Power Cord to Monitor. 
2.2.4 Connect PC to the additional monitor. 
 
I.    ISP Download program procedure  
1  Hardware Connect status: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  2  Down load isp program 
 
First :Open ISP software (Mstar ISP Utility). 
You will see the interface as below.
 
  
Second: select IC chip from device. 
Press the button of “Device”, select chip. Choose Pm25LV010. 
You can see Mfr. and size.
 
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Third: Set up ISP speed.(define value is 50, if set too high, it can cause connect fail.) 
Press the Button “Config” to set up. You can change speed of ISP by changing I2C Speed, 
 we use“50”normally. 
If you use this ISP tools first time. Port Type select LPT1 if you download f/w by Print port1(LPT1)and 
Base Addr use 0x0378 instead of 0x0000.   
 
  
Fourth: Load firmware to buffer. 
Press the button “Read”(1),and press button “Read” (2),then there will be a dialog,   
you can select the F/W file whose suffix is “bin”.   
 
 
 
Choose correspond firmware then press “ 開啟”button. You will see a dialog as below. 
Then press “ 確定” 
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