一台47cm(18英寸)金星彩电,收看过程中常出现无信号现象。据用户反映,此故障出现时,只要动一下高频头天线插座就能看一会儿,如果用手按着插头就能长期看下去。经试机,果然如用户所述。判断为接触不良所致。经检查,发现高频头内部插座接焊点开焊,焊好后重新焊回线路板。满怀信心地开机一看,又出现了无光、无声的故障,且能听到“吱吱”声。根据经 A 47cm (18 inches) Venus color TV, watching the phenomenon of no signal often appear. According to the user, this fault appears, just move the tuner antenna socket can see for a while, if you press the plug can long-term look down. After the test machine, really as described by the user. Determined as a result of poor contact. After examination, found that high-frequency connector to the internal socket to open the welding, welding and then re-welded back to the circuit board. Boot with confidence, and there was a dull, silent failure, and can hear the “creak” sound. According to the passage