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几年来本人连续修过熊猫3631G彩电的“三无”故障,故障原因完全一样,并且这种故障所损坏的元器件极多,根本原因是电路设计中的一点疏忽。现介绍如下: 故障现象:“三无”检修过程:先检查开关电源的+110V直流电压,发现其远远大于+110V电压,急忙关机。用“电阻法”检查取样电路和稳压电路,得知VD711稳压二极管烧毁开路,取样回路的R718电阻烧毁开路。更换此两元件,再通电检查,发现+110V电压正常,但图像出现水平一条亮线且无声。把亮度关小,再测开关电源的其
Over the past few years I have successfully repaired Panda 3631G color TV “three no” fault, the reason for the failure is exactly the same, and this fault damage to many components, the fundamental reason is the circuit design a little negligence. Now introduced as follows: Symptom: “three no” repair process: first check the switching power supply + 110V DC voltage and found it far greater than the + 110V voltage, quickly shut down. With the “resistance method” to check the sampling circuit and the regulator circuit, that VD711 zener diode open burning, sampling circuit R718 resistance burning open. Replace the two components, and then check the power and found + 110V voltage is normal, but the image appears a bright line and silent. Turn off the brightness, and then test the switching power supply