| 故障表现为：三无 维修与分析：通电试机指示灯不亮，三无。测量5V STB电压0V。说明故障在电源板待机电路。测量待机振荡块UB1 FSQ510 8 脚250V正常，5脚为6V摆动不正常，正常为11V。代换UB1 FSQ510后故障依旧。查找FSQ510外围元件没发现异常，试替换TB1 BCK-19026后故障机修到这里，终于修好值得探讨。。 |
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