ViewSonic VG500-2 VLCDS24349-2W Service Manual page 29

No sound
Check if Audio jack
properly insert
Check if mute key
is pressed
Check if CN701 is
connected to U701
U701 #1 voltage is
12V
Check U701 output
#2,#4,#10,#12 are
normal
Replace U701
ViewSonic Corporation
Yes
YES
Press mute key again
NO
properly
YES
No
Check U801 output
#7 is normal
Yes
No
to release
No
26
Confidential – Do Not Copy
Replace U801
VG500-2