TCL9228光栅暗无蓝屏 _TCL彩电
测量TDA4565,TDA3504各脚电压基本正常,只有TDA3504六脚(沙堡脉冲)电压为2.4V不正常(正常1.3V)。经检查是C416(1500Pf/2Kv)电容无容量。更换C416后故障排除.