XOCECO LC-52R36, Service Manual

Page: 27 / 44

2
5
2.
3 No sound
Check if the pin2 of
XA15 is 18V?
Check the
supply power
Is the signal
output from NA5
(pin5 and pin8)
Is the signal output from
NA4 (pin27 and pin28)
Does NA4 (pin67) input
signal?
Is the signal output from
TUNA1 (pin12)
Replacing NA20 NA21
Replacing NA5
Replacing NA4
Check if the
pin1 and pin2 of
XA17 is 18V?
Is high level of
NA20 NA21 pin5?
Check if XA14
pin3 is low
level?
Check CPU board
Replacing TUNA2
Check if VA21 VA22
break down
No
No Yes
Yes
No
High
No
Yes
Yes
Yes
Yes
No
No
No
Low