Check if there is input at C738 C739
Check if there is output at Pin1ǃ
Pin2 Pin3 Pin4 of CN807
No
No
Yes
Yes
No sound but have picture
Change Mainboard
Still having problems
Check if there is
sound input signal
No
Check the input source
Yes
Check if there is input at Pin3
ǃ
Pin12 of U705
Check if there is signal at L203 and L205
No
check the signal input
circuit of L203, L205
Yes
Change U705
No
Check the
speakers
Service Manual
Model No.:
ǃ
check the signal input
circuit of C738, C739
and EC807,EC812
No
Yes
Check if there is +12V at Pin15 and Pin28
of U705
Change FB1
Change L707 L708
L709 L710
ǃ
ǃ
ǃ
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