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ViewSonic Corporation
Confidential - Do Not Copy
VG1921wm-2
38
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 VG1921wm-2
Page 5: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 2 4 Handling and Placing Methods...
Page 6: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 3...
Page 35: ...Disassembly Procedure ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 32...
Page 36: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 33...
Page 37: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 34...
Page 38: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 35...
Page 51: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 48...
Page 61: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 58 11 PCB Layout Diagrams...
Page 62: ...ViewSonic Corporation Confidential Do Not Copy VG1921wm 2 59...