Service manual

6.2 No display on screen (Screen is black, LED is off).
AC power on and DC power on
no picture
LED is off
Check that C255 positive is at 5V
Check that the voltage level of
CN251 is approximately 12V
Power board failure
IC251 failure
Check CN302 pin8 is
12V, pin3 is 5V
1. Check Q309, Q310 pin.
2. Check FB315, FB316
Inverter failure
Yes
Yes
Yes
Yes
No
No
No
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ViewSonic Corporation Confidential
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Do Not Copy VG910s/b