Haier L22B1120 Service Manual page 47

4) No sound
Check if the power supply
system is damaged, short
circuit or mis-connected
Check the volume control
circuit from U19
Check the volume input
circuit from to
Check the
input
source
Reset
volume
Check the
speakers
U19
Check if there is sound input
N
Check if the volume control is
Y
at 0 level or muted
Check if there is output at
Y
Check if there is +12V input at
N
PIN28 of U19
Check if PIN7 of U19 is low
Y
Check if there is signal input at PIN3
N
- 46-
No sound
Y
signal
Y
N
J11
N
Y
voltage
N
& PIN12 of U19
Y
Replace U19