56
ViewSonic Corporation
Confidential - Do Not Copy
VA2226w-1
6.4. Output power is unstable
Unstable power
Check sampling
Circuit
Check R822,
R823, R824
Change R822,
R823, R824
Check the R pin
voltage of IC803
Check R819, R820
Check R818, D804,
C807 if short
Change
R818,
D804,
Check pin2
of IC802
Check pin1 of
IC802 voltage
b l
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 VA2226w-1
Page 5: ...2 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 4 Handling and Placing Methods...
Page 6: ...3 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...
Page 51: ...48 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Front Cover Back Cover...
Page 52: ...49 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 Keypad Board Chassis...
Page 54: ...51 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 I F Board...
Page 60: ...57 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 6 5 Backlight can t be turned on...
Page 63: ...60 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 6 8 Bad Screen...
Page 64: ...ViewSonic Corporation Confidential Do Not Copy VA2226w 1 7 Block Diagram 61...
Page 70: ...67 ViewSonic Corporation Confidential Do Not Copy VA2226w 1 9 PCB Layout Diagrams...
Page 71: ...68 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...
Page 72: ...69 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...
Page 73: ...70 ViewSonic Corporation Confidential Do Not Copy VA2226w 1...