收到同行送来的故障机壹台长虹LED32B1000C液晶电视，故障表现为背光不亮，拆机实测BL-ON电压为0V。关机拔掉插线测BL-ON（RX1档)端正反都是15欧，查电路图分析应该是C42坏了，拆下C42测试为150K，换上新电容后开机背光亮了，故障修复。 |
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