Boot detection + B, 8 + v, + 5 v, + 3.3 v is normal. Have high pressure! A positive and negative power supply is normal, HD driving signal waveform and DVD + VD - all OK. Analysis of signal channels or CPU system control circuit fault, check IC103 (51, 52, 53) feet without R, G, B drive signal output. Measuring IC103 power supply is normal. Replace the IC103 is invalid. Measuring IC103 SCL (2), (3) the SDA has 5 V but no waveform, measuring 64 feet IRIN highlights found that only about 0.5 V, the normal is 2.9 V. Shun found IC981 pull IRIN highlights voltage low lead to failure, replace IC981 after OKrgCservice manual download site