ViewSonic N1900w-1E Service Manual page 45

6.2. NO POWER
START
Check P301
5V,12V?
Yes
Check 3.3V
I305,I306
Yes
Check
1.8V,8V
Yes
Check
Keypad
Yes
Replace
Main board
ViewSonic Corporation
Check
No D821 12V No
D822 5V
Replace
No
I305,I306
Replace
No
I303,I307
Replace
No
Keypad
Replace
Power board
42
Confidential - Do Not Copy
N1900w-1E