Insignia NS-LCD47HD-09 Service Manual page 26

47"LCD TV
5. No sound
Check the source
OK
Check signal filter circuit
Check Earphone jack
OK
Check U401
Check U601, U602, U603
OK
Check speaker
Reset source
NG
Replace the filter or inductance
NG
Replace the Earphone jack
SIF signal
HDMI signal
NG
Replace U401
NG
Replace U601 or U602 or U603
NG
Replace speaker
Check TV system setup
OK
NG
Check TU201
Check U505,
U506
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Best Buy NS-LCD47HD-09
Replace TU201
NG
ReplaceU505, U506