ViewSonic VG500b-1 Service Manual page 14

Next
The Voltage of
U220 #2 is 3.3V
The Voltage after
D220 is 2.5V
Replace U401
Check X400 crystal
clock
Replace U400
(gm2115)
End
ViewSonic Corporation
No
Replace U220
Yes
No
ReplaceD220
Yes
Still No LED
No
Replace X400, C447,
C448
Yes
11
Confidential – Do Not Copy
VG500b-1