Service Manual
Model No.:
- 46 -
4) No sound
No sound
N
N
Check if there is sound input
signal
Reset
volume
Y
Y
Check the
input
source
N
Check if the volume control is
at 0 level or muted
Check the
speakers
Y
N
Check if there is output at
J11
Check if there is +12V input at
PIN of U19
Check if the power supply
system is damaged, short
circuit or mis-connected
N
Y
Check if MUTE PIN7 of U19 is low
voltage
Check the volume control
circuit from
U19
Y
N
Check if there is signal input at PIN1
& PIN12
of U19
Check the volume input
circuit from U8 to
N
Y
Replace
U19
U19
8
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