The noise come from RF mode ( Connect antenna and choose TV program )
Checked all CH are same problem ( TPBS , MCOT, CH3, CH5, CH7 )
Level volume of TV & STB not impact to this issue
Verify sample STB from TP , All set from TP has problem same.
Verify feature USB reading ( Play Movie and upper to high volume )
Sound is clear ( No problem )
Recode problem to USB for send to HITOP verify