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一台日本松下TC-29VZH型(29英寸)大屏幕遥控彩电,出现开机三无故障现象。检查电源熔断丝F_(801)被烧毁且管内发黑,显然是机内有短路现象或保护电路动作引起电流过大所致。采用分割法分段进行检修:第一步,断开交流输入电路自动切换电路见图1所示,与开关电源电路的连线,换上熔断丝开机,熔断丝再次烧毁,可见故障范围在交流输入电压自动切换电路;第二步,断开自动切换电路中的过压保护电路(焊脱过压保护元件可控硅Q_(813)的阳极上电感线圈
A Japanese Panasonic TC-29VZH (29 inches) large-screen remote color TV, there is no boot failure phenomenon. Check the power fuse F_ (801) was burned and the tube black, apparently there is a short circuit or protect the circuit caused by the current caused by excessive current. The use of segmentation method for maintenance: the first step, disconnect the AC input circuit automatically switches the circuit shown in Figure 1, and switching power supply circuit connection, put the fuse wire boot, fuse again burned, we can see the fault range in the exchange Input voltage automatic switching circuit; The second step, disconnect the automatic switching circuit in the over-voltage protection circuit (welding off the overvoltage protection components SCR Q_ (813) on the anode inductor