Check if there is input at Pin3
ǃ
Pin5 of U19
Check if there is output at Pi
n4
ǃ
Pin6 of U18
No
No
Yes
Yes
Replace U7
Check the circuit between U19 and
Pin1
ǃ
Pi
n9 of U18
No sound but have picture
C
hang
e Ma
inboard
Still having
p
roblems
Check if there is
sound input signal
No
Check the input source
Yes
No
Verify if U
1
8 has the
right power in (Pin 7)
Check if there is output at Pi
n1
ǃ
Pin7 of U19
Change U18
Yes
Check if there is signal at C219 and C212
No
check the signal input
circuit of C219, C212
Yes
Check if there is input at Pin1
ǃ
Pin9 of U18
Yes
Change U19
No
Check the
speakers
Service Manual
Model No.:
- 50 -