| 故障表现为：带载能力差 维修与分析：通电待机时测3.3V STB电压正常,开机3.3V STB降为1.5V左右.检查IC3外围元件没有发现问题.更换IC3,FSQ510.次级电容整流管逐一更换故障依旧.找来同样板测量发现CB21两端阻值变成300欧.应急将其去掉故障机修到这里，终于修好值得探讨。. |
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