收到同行送来的故障机壹台康佳LC22HS66AB液晶电视,故障表现为指示灯不亮。300V正常,12V不到2V。CM0765R的3脚在10V左右波动。CW908(160V/1uF)、CW905(50V/47uF)附近印刷板漏电,处理干净,无效。RW902、RW903、RW904(334)正常,换CM0765R故障不变。再查CM0765R的6脚外接贴片电阻,一只电阻(1872)阻值为18.7K正常,另一只电阻(334)阻值变小为56K。换上一只3303贴片电阻,12V输出正常,故障机修到这里,终于修好值得探讨。。 |
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