Check if there is input at C738
ǃ
Check if there is output at Pi
n1
ǃ
Pin4 of CN807
No
No
Yes
Yes
Change U705
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
Change L707 L708
Check if there is +12V at Pin15 and Pin28 of U705
Check if there is signal at L203 and L205
No
check the signal input
circuit of L203,L205
Yes
Check if there is input at Pin3
ǃ
Pin12 of U705
Yes
Change FB1
No
Check the
speakers
Service Manual
Model No.:
- 40 -
C739
Check the signal input
circuit of C736 C739
and EC807 EC812
L709 L710