收到同行送来的故障机壹台创维42K05HR液晶电视，故障表现为通电指示灯绿灯黑屏，开盖检测电源板供电+5V、+12V、+24V输出正常。接着检测开机脚电压为1.3V，背光灯开屏脚为0V，还有屏供电脚也是0V。说明故障在主板上，再检测主板三端稳压集成的各路电压+3.3V、+1.8V、+1.2V唯独U9三端稳压1.8V输出只有1.5V。代换U9后电视一切正常。 |
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