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例1 [故障现象]QI AO YANG K-33 VCD,开机后OSD显示商标正常,重放时图象被一层花花绿绿的彩斑掩盖,仅有一个模糊的轮廓,伴音正常。 [分析与检查]开始时怀疑SAA7185与CL484联接口有虚焊,补焊后故障依旧,无意中发现当烙铁靠近CL484表面时,彩斑逐渐减少,直到正常,移开烙铁,故障慢慢出现且越来越严重,说明CL484内部热稳定性不良。 [措施]更换CL484后,故障消失。
Example 1 [Problem] QI AO YANG K-33 VCD, OSD display after boot normal, the image is a layer of colorful green spots covered during playback, only a fuzzy outline, sound normal. [Analysis and inspection] Initially suspected SAA7185 and CL484 joint Weld, weld repair failure remains, accidentally found when the iron near the CL484 surface, the color spots gradually reduced until the normal, remove the soldering iron, the fault slowly and More and more serious, indicating poor internal thermal stability CL484. [Action] After replacing the CL484, the error disappears.