Check if there is input at C738 C739
Check if there is output at Pin1
、
Pin2 Pin3 Pin4 of J17
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
、
Pin12 of UD3
Check if there is signal at C715 and RC728
No
check the signal input
circuit of C715,C728
Yes
Change UD3
No
Check the
speakers
S
ervice M
a
nu
a
l
Model No.:
、
check the signal input
circuit of C738, C739
and U702
No
Yes
Check if there is +12V at Pin15 and Pin28 of UD3
Change LD3
Change FB6 FB8
FB9 FB10
、
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