Service manual

Check if Audio jack
properly insert
Yes
Press mute key again
to release
YES
NO
Check if CN701 is
connected to U701
properly
No
Replace U701
U701 #1 voltage is
12V
Yes
YES
No sound
Check if mute key
is pressed
Check U801 output
#7 is normal
No
Replace U801
Check U701 output
#2,#4,#10,#12 are
normal
No
ViewSonic Corporation
21
Confidential – Do Not Copy
VG500b