Check if there is input at Pin3
ǃ
Pin5 of U701
Check if there is output at Pi
n4
ǃ
Pin6 of U702
No
No
Yes
Yes
Replace U701
Check the circuit bet
w
een U701 and
Pin1
ǃ
Pi
n9 of U702
No sound but have picture
C
han
g
e Ma
inboard
Still havin
g
p
roblems
Check if there is
sound input si
g
nal
No
Check the input source
Yes
No
Verify if U
702 has the
ri
g
ht po
w
er in (Pin 7)
Check if there is output at Pi
n1
ǃ
Pin7 of U701
Chan
g
e U702
Yes
Check if there is si
g
nal at R318 and R323
No
check the si
g
nal input
circuit of R318, R323
Yes
Check if there is input at Pin1
ǃ
Pin9 of U702
Yes
Chan
g
e U701
No
Check the
speakers
Service Manual
Model No.:
- 42 -
