Haier HL22KN1 Service Manual page 45

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