This machine according to the remote control to change channels, no character, according to a slightly raised, accelerating voltage flyback line, tube line, field scanning circuit and auxiliary circuit basic normal work. First measure sandcastles pulse, namely IC601 (TAl215AN) 10 feet voltage, measured at 1.7 V, the normal should be 0.7 V or so, sand castle pulse abnormal. Check sand castle no abnormal pulse forming circuit, check ABL circuit, namely the resistance measurement R850 Ω (82 k) on both ends of the voltage, end voltage + B, on the other side is 0.45 V, but the end is through the diode D557 (MA167) negative ground for clamping, considering this machine as the main line color TV, should check whether the bus voltage is normal. Measuring voltage of the CPU (MN1875876T5H) bus first, including {and} feet SDA1 is 4.7 V, 29 feet SCL1 voltage of 4.3 V, measured again IC601 {13} feet (SDA1) and {} 14 feet (SCL1) working voltage, 7.15 V, 4.3 V, respectively apparently {13} the foot of cable, working voltage is more than the normal operating voltage. Affiliated with the CPU bus except IC601 and dark balance adjustment integrated circuit IC3401 (TA8889AP), measuring IC3401 pet-name ruby foot SCL1 voltage of 4.3 V, {10} feet SDA1 voltage of 4.7 V is normal, doubt TA8889AP damage, but its replacement after the problem remains. Considering that this bus is linked together, the voltage should be the same, the two lines for inspection, found from R3404 to break between R631, from R1134 to R631 also break at the same time, with wires connected after commissioning troubleshooting.iHVservice manual download site