Haier L32F1120, Service Manual

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4) No sound
No sound
Y
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
PIN28 of U20
Check if the power supply
system is damaged, short
circuit or mis-connected
N
Y
Check if PIN1 of U20 is low
voltage
Check the volume control
circuit from U20
Y
N
Check if there is signal input at PIN3
& PIN12 of U20
Check the volume input
circuit from to
U20
N
Y
Replace U20