ViewSonic VG910S - 19" LCD Monitor Service Manual page 29

6.4 Show "No signal" on screen.
Check that signal level of R612, R613, R614, R641, R642, R643, R644, R645, R646, R647, R648
Yes
Check the Hsync and Vsync
6.5 Keypad cannot work.
Yes
Failure point
1. D305, D306 ~ D311, D312 failure.
2. TACT switch failure.
ViewSonic Corporation
No
Check the the cable is fully conneted between the interface
board and key board
26
No
Failure point
1. IC401 failure.
2. Signal cable is disconnected.
Failure point
The cable is disconnected.
Confidential - Do Not Copy
No
VG910s/b