ViewSonic VG910S Service Manual - Page 27

No display on screen Screen is black, LED is off.

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6.2 No display on screen (Screen is black, LED is off). AC power on and DC power on no picture LED is off Yes Yes Check that C255 positive is at 5V Yes Check CN302 pin8 is 12V, pin3 is 5V No IC251 failure Check that the voltage level of CN251 is approximately 12V No Power board failure Yes Inverter failure No 1. Check Q309, Q310 pin. 2. Check FB315, FB316 ViewSonic Corporation Confidential - Do Not Copy VG910s/b 24

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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
24
ViewSonic Corporation
Co
nfidential
- Do Not Copy
VG910s/b