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一台海虹牌35 cm(14英寸)多制式彩色电视机,出现一条水平亮线的故障。打开机壳检查,通过测量场输出部分元件,发现场扫描输出集成块N401(AN5522)(组装机安装此块较多)的②脚(电源供电端)与⑤脚(场扫描输出端)的电压相等为25.2 V。关机手摸场输出集成块AN5522表面(即型号字面上)很烫,果断判定AN5522已经损坏了。经过多方购买未果。遂测其应用电路原理图,分析发现与LA78040或LA78041的引脚功能、排列形式、电路应用均基本相似。于是采用直接互换的方法,取得成功。场扫描输出集成块AN5522、LA78040、LA78041均采用T0—220E 7个引脚封装形式。封装形式图参见图
A Haihong 35 cm (14 inch) multi-format color TV set showed a horizontal bright line fault. Open the case check, through the measurement field output part of the component, found field scanning output manifold N401 (AN5522) (assembly machine install this block more) ② feet (power supply side) and ⑤ feet (field scan output) voltage Equal to 25.2 V. Off the hand touch field output manifold AN5522 surface (that is, the model literally) is very hot, decisive judgment AN5522 has been damaged. After many failed to buy. Then test its application circuit schematics, analysis and found LA78040 or LA78041 pin functions, arrangement, circuit applications are basically similar. So using direct exchange method, to achieve success. Field scan output manifold AN5522, LA78040, LA78041 are T0-220E 7 pin package. See the figure for the package diagram