Service manual

2). Burn In Mode:
Press  ,   buttons simultaneously and Power on without signal, hold on for 3 seconds. Then the
screen will show Burn In Mode. Press button, you can find the information about this monitor.
3). White Balance:
Set the screen on 640*480@60Hz resolution pure black and white pattern, no other color. Press  , 
 and   simultaneously.
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ViewSonic Corporation Confidential
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Do Not Copy VP191b/s