收到同行送来的故障机壹台长虹55D3C曲面液晶电视，故障表现为不通电，拆机检查电源正常，待机灯不亮，判断主板问题，查待机12V经过MOS管，5V时有时无，直接短路开机正常，更换MOS管后全正常。      |
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