Users, according to the machine before there was a leak failure, but had to deal with, also equipped with liquid collection bags. Check carefully, and found no oil leakage. Boot touched power amplifier block with forceps IC601 signal input 7, 11 feet, trumpet sound, prove amplifier basic normal, touch the output end of the audio processing box MS01 20, 22 feet, trumpet sound, 10, 12 feet touch input again, silent, clearly problem in MS01 place, measuring MS01 21 feet 9 10 v, 13 feet 10 5 v working voltage are normal. So doubt audio processing box MS01 internal fault, in order to further validation, VCD machine connected to the test, found in AV state not only silent, and no pictures. Looks like a TV/AV conversion circuit malfunction. What caused the two out of order at the same time? Suddenly thought of controlled: QQQ, forgot MS01 SCL, SDA voltage measurement. Measuring MS01 SDA end (3) feet is + 4.5 V, normal; SCL end (4) feet is 0.9 V, is not normal, normal is + 4.5 V. In certain parts of the machine data bus control, as shown in the figure of CPU SDA end 12 feet, SCL end 11 feet voltage are normal, obviously the problem SCL line during transport. Carefully check printed circuit, found from R914 to IC701 20 feet, MS01 4 feet between the coated copper wire has a rust, obviously this is the last time after the oil spill, no will sit in a clean, oil corrosion caused by the circuit board. Well this route, troubleshooting.YHLservice manual download site