XOCECO LC-42R27, Руководство по обслуживанию

Страница: 27 / 43

25
3. No sound
Check if the pin2 of
XA15 is 18V?
Check the
supply power
Is the signal
output NA5
(pin5
and pin8)
Is the signal output
NA4 (pin27 and pin28)
Is the signal output NA4
(pin67)
Is the signal output
TUNA1(pin12)
Replacing NA7
Replacing NA5
Replacing NA4
Check if the
pin1 and pin2 of
XA17 is 18V?
Is high level of
NA9
(pin1)
Check if
RA136 short to
the ground?
Which is high
level for DA8,
DA10, DA11?
Replacing TUNA1
Check the
pin3 of
X14 Check the
speaker output
1, 2 or 3,4 Check the
output
of V18
No
No Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
No
DA11 DA8 DA10