收到同行送来的故障机壹台康佳LED55X9800U液晶电视，故障表现为灯亮不开机，偶尔开机，只要开机就正常看。关机后重新开机灯亮不开机的几率很高。刷程序无果。检查主板供电后发现5V待机电压正常。开机启动电压3.3V正常。电源无12v无输出。维修电源板，最后更换NF903厚膜块7930电视机正常。 |
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