Haier L19A11W, Руководство по обслуживанию

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No sound
Check audio signal input
Check
periphery
audio
equipment
Check pin7 of U3(for 11~12V)
N
Y
Y
N
Check pin8 of U3( ≥ 9.2V)
Check u3
power
circuit
Check VOLUME and MUTE
Reset item
Check signal output
of CN11
Y
N
Check
speak
louder
N
Y
Check U6 circuit
Check signal input of
pin1/9 of U3
Y N
Y
N
Check signal
output of pin4/6
of U3
Check signal output
of pin60/61 of U21
Y
N
Broken U3 or
E45
Check circuit
between U3 and
CN11
Check
u21
pin60/61
to u3
pin1/9
Check audio input signal:
SCART:
pin56/57of u21
AV:
pin49/50 of u21
PC:
pin53/54 of u21
Check u21
Check
network
between
audio
input and
u21
Y
N
Y N