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No sound
Check if Audio
jack properly insert
Yes
Check if mute key
is pressed
NO
Check if CN701 is
connected to CN101
properly
YES
U701 #1 voltage is
10.5V
Yes
Check U701 output
#2,#4,#10,#12 are
normal
No
Replace U701
ViewSonic Corporation
YES
Press mute key again
to release
No
Check U801 output
#7 is normal
YES
U803 #8 is 10.5V
No
Replace U803
13
No
Replace U801
Confidential – Do Not Copy
VG500b-1
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