Haier HL22KN1, Руководство по обслуживанию

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No sound
Check if have audio input signal
Check the
audio
source
Check U3/TPA1517NE-pin7
for power supply >11V
N
Y
Y
N
Check U3-pin8 voltage
≥
9.2V
Check the
Power supply
Circuit for
U3
Check the set of volume
and MUTE
Reset it
Check CN11 output
signal
Y
N
Check the
speaker
N
Y
Check the circuit
from U6-pin2,30 to
U3-pin8 or U6 had
been damaged
Check if U3-pin1,9 have
audio signal input
Y N
Y
N
Check if U3-pin4,6 have
audio signal output
Check if U21-pin60,61
have audio signal output
Y
N
Change U3
Check the output
circuit from U3
and CN23
Check the
net between
U21-pin60,61
And U3-pin1,9
Check audio input signal:
PC/SV/YPBPR:
U21-pin53,54
SCAR:
U21-pin56,57
Check U21-
pin45 for 8V
or change
U21
Check the
net between
audio input
jack and
U21
Y
N
Y N
Audio trouble
（
No sound
）