ViewSonic Va1912w4 Service Manual

							
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Step 6 :
 
Loose  and remove 2 screws.  Step 7 :
 
Loose and remove 2 screws.  
Step 8 :  
Loose and remove 4 screws.  Step 9 :
 
Remove the PCBA Cover  ViewSonic Corporation
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3.2 Remove Power Board and AD Board
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Step 1 :
 
Loose and remov e 4 screws.  Step 2 :
 
Remove Lips Board   Step 3 :
 
Remove 2 pieces of FFCs.   Step 4 :
 
Remove the FFC.   
Step 5 :  
Loose and remove 4 screws.  ViewSonic Corporation
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4 Change New AD Board and Power Board
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Step 1 :
 
Place new AD Board.  
And fasten 4 fixed screws.  
Step 3 :   
Insert FFC.  
Step7 :
 
Completed.  
Step 4 :  
Insert  2 pieces of FFCs  .  
  Step 6
 : 
Remove AD PCBA.   Step 2 :
 
Fasten 4 fixed screws.  ViewSonic Corporation
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Step 5 :
 
Insert new Lips Board .  Step 6 :
 
Fasten 4 fixed screws.  
Step 7 : Completed.  
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5. Remove OSD Board
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
  Step 1 :
 
Separate both Audio Cable.  
 
Step 2 :  
Take OSD Board apart.  
Step 3:  
Completed.  ViewSonic Corporation
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6.Change New OSD Board
 
 
 
 
 
 
 
 
 
 
 
 
7.  Add Cover to AD PCB Heatsink  
 
 
 
 
 
 
  Step 1 :
 
Place New OSD Board.  
Step 2  : 
Insert Audio cable to connectors of 
New OSD Board.  
Step 1 :  
Join the PCB Cover.  
Step 2 :  
Fasten 4 fixed screws.  
Step 3:
 
Completed.  
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Step 3 :
 
Fasten 2 fixed screws   Step 4 
: 
Fasten 2 fixed screws.   Step 5 :
 
Insert 2 pieces of Backlight wires.  
 
Step 6 :  
Insert 2 pieces of Backlight.  wires.   Step 7 :
 
Join  LCD module and remove bezel.  
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8.
 Rear Assy & Stand Assembly  
 
 
 
 
 
 
 
 
 
  Step 10 :
 
Completed.  
Step 1 :  
Place Rear Cover.  
Step 2 :  
Fasten 2 fixed screws.   Step 3 :
 
Place the Stand Assy.   Step 8 :
 
Fasten 4 fixed screws.   Step 9 : 
 
Insert FFC.  ViewSonic Corporation
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Step 5 :
 
Join the Stand Cover.    
Step 6 :
 
Join the Seat Assy  
Step 7 :  
Completed.   Step 4 :
 
Fasten 4 fixed screws.  ViewSonic Corporation
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 37 
ViewSonic Corporation
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6. Troubleshooting  Flow  Chart 
 
 
Defect Mode Failure Analysis Repair Testing 
 
Flash Dots 
Bright Dot 
Dark Dot 
Backlight
 
Light Leakage 
Mura 
Image Sticking 
Brightness spot 
Particle  
Dot Defect  Check Panel 
Light On Test 
 
Next Step
※ 
“ Panel Change” Should be Performed to Level 3 Repair 
Abnormal 
Display 
TEST 
NG 
 A Completed 
Image Remain 
Group Bright 
 Dots 
Others Cosmetics 
Defect 
Panel Change