接修一台三星LA40B550K1F液晶电视，问题表现为开机三无，电源板号型号是BN44，00264A，图纸，，拆机测量保险丝FS801S开路，BD801S正负极电阻3K欧左右，断开LP801S后BD801S阻值恢复正常，拿下QP80S发现D......