XOCECO LC-27R18, Service Manual

Page: 25 / 42

23
3. No sound
Check if the pin2 of
XA11 is 24V/18V?
Check the
supply power
Is the signal
output NA7(pin5
and pin8)
Is the signal output
NA6(pin27 and pin28)
Is the signal output
NA6(pin27)
Is the signal output
TUN1(pin12)
Replacing NA9
Replacing NA7
Replacing NA6
Check if the
pin1 and pin2 of
XA12 is
18V/24V?
Is high level of
NA1(pin1)
Check RA76
Which is high
level for DA1,
DA2, DA3
Replacing TUN1
Check the
pin3 of
X14 Check the
speaker output
1, 2 or 3,4 Check
VA7
No
No Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
No
DA11 DA1 DA2