TCL 48D2700/MT56B-AP Service Manual page 39

3、 Abnormal sound：
Abnormal sound
Individual sound
Check all sound
signal source
source
Check the sound signal
Check sound IC
link to main IC
N
Y
N
Check the power of
Check the peripheral
Check wave filter and
sound IC
circuit of main IC,SW
speaker？
Y
Check the mute
function