故障现象:彩电高压帽处打火,用高纯酒精清洗干净后,再用吹风机吹干,换上新高压帽并涂上彩电专用灭弧剂后,使用不到两个月.打火现象又复发。分析检修:从以述这种现象来看,是属高压过高造成的。而造成高压过高的原因主要有以下两个因素。一是行逆程电容容量减小造成高压过高打火。因为行逆程电容容量变小后,与行电路有关电压均会升高,如灯丝电压等。可用万用表测量高压是否高于正常值,也可用电容表测量逆程电 Symptom: high voltage cap at the TV ignition, clean with high purity alcohol, and then use the hair dryer to dry, put on a new high-pressure cap and coated with a dedicated arc extinguishing agent, the use of less than two months. relapse. Analysis and maintenance: From the description of this phenomenon, it is caused by high pressure. The main reason for the high pressure caused by the following two factors. First, reduce the capacity of reverse line capacitance caused by high pressure ignition. Because the capacity of reverse row capacitance becomes smaller, and the circuit voltage will rise, such as filament voltage. Multimeter can be used to measure the high pressure is higher than normal, you can also use a capacitance meter to measure the reverse process