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昆仑S561彩电多起故障一例 故障现象:开机吱吱作响、冒烟、声光皆无。 分析与检修:查供视放末级的180V电源的滤波电容C350、C351(4.7μp/250V)开裂,工作时冒白烟。换上述两电容仍无声、光、井有轻微的卡卡放电声。查供行电路的主电源120V上升为180V,电源处于保护状态,电源输出电压上升属于电源厚膜块或反馈耦合电容C330(100μ/25V)有问题所致。查C330轻微漏电,换C330,120V输出正常。说明C330变质。
Kunlun S561 color TV more than one fault failure phenomenon: Boot creaking, smoke, no sound and light. Analysis and Maintenance: Check for the final stage of the 180V power supply filter capacitor C350, C351 (4.7μp / 250V) cracking, taking white smoke. Change the two capacitors are still silent, light, there is a slight sound of Kaka discharge. Check the main circuit of the main power supply 120V up to 180V, the power supply is protected, the power supply output voltage is thick film or feedback coupling capacitor C330 (100μ / 25V) have problems. Check C330 slight leakage, for C330, 120V output is normal. C330 metamorphism.