Peer to repair a Konka 29-inch CRT color TV motherboard, the fault is a horizontal bright line. The peer has checked the field output and replaced the field output block N401TDA8172A. I couldn't fix it and asked me to help. I connected the yaw and the picture tube to the test machine. The fault phenomenon is actually a horizontal bright line. Since the peer has replaced the field block and checked the field output, I checked the field scan front directly. The 8V power supply for the 14 and 39 feet of the test super chip N103OM8373PS/N3/A/1586 is 3.72V. Obviously the fault is caused by the 8V power supply reduction. The voltage of the 1-pin input terminal of the test N952L7808CV is about 6V, while the emitter input of the standby/power-trimming transistor V953A751 is 12V normal, and the eb junction of A751 is positively biased by 0.75V, but the A751 is c-level. However, only output 6V voltage, indicating that A751 has been damaged, replace the A751 with A940 and test machine OK.
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