When AV audio is normal. Check IC101 / TC4053BP conversion to normal. IC601 / tuning TA7630P electric quantity normal integrated piece of audio input. But there is no audio output. Volume control side (8) feet when TV without a high level, check the CPU/M37210M3-807 p (3) feet when TV without a high level, the radio signal recognition (18) feet without a high level, scrutinize found W017 and ground wire short circuit, after separating machine is normal.R84service manual download site