北方的雨季,每当雷雨交加过后,经常会有一些彩电遭到雷电的袭击而损坏。雷电进户的渠道不同,多数是从220V 市电线路进户的,也有从有线电视电缆线路进户的。由于雷电的强弱不同,对电视机的损坏程度也不尽相同。据笔者经验,雷击彩电的故障部位一般主要集中在开关电源电路。轻则击穿300V 整流二极管或整流桥块,烧断限流电阻和保险管;重则使开关电源不同程度损坏,甚至同时殃及CPU 控制系统,包括 CPU 和存储器及其供电电路,复位电路和接收头等相关外围电路。当某处遭雷后需要上门维修电视机时,最好根据损坏的电视机数量,已知和未知的常见机型,把元器件准备得充分一些,尤其对开关电源电路所需的整流二极管、开关二极管、稳压管和各种型号的三极管在数量上更要充分考虑,以避免出门很远时三番五次 The rainy season in the north, often after the thunderstorms, often have some color TV was damaged by thunder and lightning. Thunder and lightning into different channels, most of them from the 220V electricity lines into households, but also from the Cable TV cable into the household. Due to the different strengths and weaknesses of lightning, the extent of damage to the TV are not the same. According to my experience, the breakdown of the lightning color TV is generally concentrated in the switching power supply circuit. Ranging from breakdown of 300V rectifier diode or rectifier bridge block, blow current limiting resistor and fuse; heavy switch power supply is damaged to varying degrees, and even affect the CPU control system, including CPU and memory and power supply circuit, reset circuit and Receive first class related peripheral circuits. When somewhere after the mine need to come home to repair the TV, it is best based on the number of damaged TVs, known and unknown common models, the components are fully prepared, especially for switching power supply rectifier diodes, Switching diodes, Zener and various types of transistors in the number should be fully considered, to avoid going out far when time and again