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故障现象:飞利浦42PF7593型液晶彩电,在收看过程中如果更换频道,扬声器就会有很响的“嘭嘭”声出现,但如果在开/关机时可听到同样的噪声,因为听到刺耳,用户送来检修。原因分析:根据传统的机型,此类现象并不鲜见,一般都是因为音量电位器的机械噪声或长期磨损而产生,可液晶彩电都是新型的智能机型,数字化集成度极高,几乎没有机械元器件,此种干扰杂音一般是不会产生的。由于故障现象是在换台和开/关时产生的,于是联想到电路出现异常,于是检修前试机,当按
Symptom: Philips 42PF7593-type LCD TV, if you change the channel during the viewing process, the speaker will have a very loud “嘭 嘭 ” sound appears, but if you hear the same noise on / off, because you hear Harsh, the user sent overhaul. Analysis of the reasons: According to the traditional models, such phenomena are not uncommon, usually because of the volume potentiometer mechanical noise or long-term wear and tear can be generated LCD TV is a new type of intelligent, high degree of digital integration, Almost no mechanical components, such interference noise is generally not produced. As a result of the phenomenon of failure in Taiwan and on / off generated, so think of abnormal circuit, so before maintenance test machine, when pressed