收到同行送来的故障机壹台康佳LED42M2800PDE液晶电视，故障表现为开机屏闪，屏亮了马上关机又开机反复如此，测主电压12V至0V变化，经查是保护电路的电阻R755开路引起的，更换电阻后故障修复。 |
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