ViewSonic Vx2255wmb-2 Service Manual

 
 
         832 X 624 @ 75Hz (Apple,Mac II)
         1024 X 768 @ 60Hz (VESA)
         1024 X 768 @ 70Hz (VESA)
         1024 X 768 @ 75Hz (VESA)
  1280 X 1024 @ 75Hz (VESA)
(37)     Manufacturer's Reserved Timing:
         1152 X 870 @ 75Hz (Apple,Mac II)
(38-53)  Standard Timing Identification:
         1600 X 1200 @60Hz
         1400 X 1050 @60Hz
         1440 X 900 @60Hz
         1280 X 960 @60Hz
         1280 X 1024 @60Hz
         1152 X 864 @75Hz
         Not Used
         Not Used...

 
 
VX2255wmh-2_D
                            Time:  08:19:00
                        Date:  Tue Jan 16, 2007
______________________________________________________________________
                        VIEWSONIC CORPORATION
                    EDID Version # 1,  Revision # 3
                  DDCTest For: ViewSonic VX2255wm-2
______________________________________________________________________
EDID Block 0, Bytes 0-127
128 BYTES OF EDID CODE:
         0   1   2   3   4   5   6   7   8   9...

 
 
         832 X 624 @ 75Hz (Apple,Mac II)
         1024 X 768 @ 60Hz (VESA)
         1024 X 768 @ 70Hz (VESA)
         1024 X 768 @ 75Hz (VESA)
         1280 X 1024 @ 75Hz (VESA)
(37)     Manufacturer's Reserved Timing:
         1152 X 870 @ 75Hz (Apple,Mac II)
(38-53)  Standard Timing Identification:
         1600 X 1200 @60Hz
         1400 X 1050 @60Hz
         1440 X 900@60Hz
         1280 X 960 @60Hz
         1280 X 1024 @60Hz
         1152 X 864 @75Hz
         Not Used
         Not Used...

5. Adjustment Procedure 
 
 5.1  Key Function Description 
CONTROL KEY KEYS FUNCTION 
[AUTO] [2]  By pressing [AUTO] key,  “Auto Image Adjust” is performed 
[MENU] [1]  By pressing [MENU] key, Main menu display   
[▼ ] [▲ ]  A. When “MENU OSD” display, press these keys to change the contents of an 
adjustment item, or change an adjustment value 
B. When “MENU OSD” is un-display, press these keys to change brightness and  contrast 
[POWER] []  Power on or power off the monitor 
  5.2  Hot Key Operation...

 42 
ViewSonic Corporation 
Confidential - Do Not Copy    VX2255wmb-2 
  VX2255wmh-2 
 
5.3 OSD Control  
5.3.1 OSD table 
Layer 1 Layer 2 Layer 3 
Auto Image Adjust     
Contrast (+ / -)   Contrast/Brightness 
Brightness (+ / -)   
Vo l u m e  Volume (+ / -) Audio  Mute On/Off 
sRGB   
9300K   
7500K  
6500K   
5400K   
Red (+ / -) 
Green (+ / -) 
Color Adjust 
User Color  Blue (+ / -) 
Information     
H Position (+ / -) H/V Position 
V Position (+ / -) 
H Size  + / - 
Fine Tune + / - 
Manual Image...

5.3.2 OSD lock Menu function 
                          OSD Lock Menu Function Check 
Item Method Phenomenon 
Activate OSD lock  [1] + [▲] 10S  Press any of buttons1, 
▼,  
 ▲ , 2 will appear OSD Locked 
3s 
Deactivate OSD lock:  [1] + [ ▲] 10S(again) 
 
NOTICE:  
When the OSD is locked will lock all functions. 
Status bar indicating OSD Lock or Unlock is in progress and when complete it will indicate “OSD 
Locked” 
        OSD Lock should not lock Power Button and Power Lock function 
5.3.3 Power lock...

5.3.4 Resolution notice function 
 
Resolution Notice Menu 
Item Method Phenomenon 
Activate  
Resolution Notice Menu Resolution Notice OSD should show 
on screen after changing to 
non-native mode for 30 sec,   
And it should disappear after 10s   
or by pushing button [1] or [2] 
------ 
Deactivate  
Resolution Notice Menu 
Push button [2] under Resolution 
Notice OSD, select Disable 
------- 
5.3.5 Factory Mode Introduction 
  When input the signal, press “power key” to turn off the monitor. Press”...

5.6  EDID (Rewrite EDID data to EEPROM) 
If we need to rewrite the EEPROM data, please confirm the following steps. 
1. Plug in VGA Cable; we can rewrite the EDID data to EEPROM by using “EDID Rewrite” 
program. 
2. If the “EDID Rewrite” process finished , please pull out VGA cable and press ‘’2’’+’’ ▲’’ at the 
same time. 
3. Pull out AC power cable or press power key to restart. 
5.7      Upload firmware to MCU via VGA Cable 
5.7.1 Connect ISP board between m onitor and PC as below configure...

(3). Select “Run”, start ISP.   
 
 
 
 
(4). When the picture show “Verify OK”, ISP finished.   
 
 
 
 
 
 
 
 
 46 
ViewSonic Corporation 
Confidential - Do Not Copy    VX2255wmb-2 
  VX2255wmh-2  

 
5.7.3  After repair, to ensure the quality you should do the following 
test and adjustment 
 
Item Content Equipment 
Test OSD function  1.Signal is set as 1680x1050@60Hz   
2. LCM button are from left to right, checking whether each single 
function key and compound function key can be worked.  Chroma 
Signal Generator 
Contrast Check 1. Set input mode to 1680x1050@60Hz 
2. Set Pattern to 32 gray shades 
3. Set contrast to the max. The brightest 6~8 shades brightness cannot 
be distinguished....