收到同行送来的故障机壹台创维42K05HR液晶电视，故障表现是开机无光无声无指示灯，拆开机器检修，首先测量24V，12V，5V，电压均正常，测量BL-ON/OFF为0V，主板无开机指令，怀颖主板有问题，拆开主芯片铁罩子，测U9（AS1117L-18）1.8V稳压块无电压输出并有发黄的痕迹，更换后机器修复。  |
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