Acer AT2701W, Руководство по обслуживанию, Страница: 41 / 63

41
Audio Control Block
No Sound
Check CN111, CN112
and L100, L101,
L102, L103
Check U602 Output to CN111,
CN112 relative circuit
Check U602 output
relative circuit and VCC at
pin 25
，
26
，
29
，
30
，
33
(12V)
Check CN600 Pin3-4 and
Pin1-2 are short when no
ear-phone plug
Check ear-phone
board
Check U603 output
relative circuit
Check TUNER Pin11
to U108 Pin50
relative circuit
Check U100 output to
U108 pin41, 42 relative
circuit
Check U108 MSP3415
output relative circuit
OK
OK
NG
NG
NG
NG
NG
Check U108 output to U603
，
U603 input relative circuit
OK
Check CN103 to
U108 pin44, 45
relative circuit