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ViewSonic Corporation
Confidential - Do Not Copy
VA1930wm-1
4
1
3.
DC output voltage is unstable
Unstable power
Check sampling
Circuit
Check R822,
R823, R824
Change R822,
R823, R824
Check the R pin
voltage of IC803
about 2.5V
Check R819, R820
Check R818, D804,
C807 if short
Change
R818, D804,
Check pin2 of
IC802 voltage
is 3V
Check pin1 of
IC802 voltage
below 1V
Change R808, R 809,
R810, R 811, R815,
END
Check the C
pin voltage of
IC803 if 3V
Change
IC803
Summary of Contents for VA1930wm-1
Page 5: ...ViewSonic Corporation Confidential Do Not Copy VA1930wm 1 2 4 Handling and Placing Methods...
Page 6: ...ViewSonic Corporation Confidential Do Not Copy VA1930wm 1 3...
Page 39: ...ViewSonic Corporation Confidential Do Not Copy VA1930wm 1 36...
Page 40: ...ViewSonic Corporation Confidential Do Not Copy VA1930wm 1 37...
Page 55: ...ViewSonic Corporation Confidential Do Not Copy VA1930wm 1 52 9 Block Diagram...
Page 63: ...ViewSonic Corporation Confidential Do Not Copy VG1930wm 1 60 11 PCB Layout Diagrams...
Page 64: ...ViewSonic Corporation Confidential Do Not Copy VG1930wm 1 61...
Page 65: ...ViewSonic Corporation Confidential Do Not Copy VG1930wm 1 62...
Page 66: ...ViewSonic Corporation Confidential Do Not Copy VG1930wm 1 63...