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一家网吧的多台方正Aone PA448彩显接二连三出现“三无”故障,有的还烧了大片元件,特整理典型故障二例。例1 故障现象:最初开机困难,但偶尔可开机工作,最后一次开机工作几分钟后“三无”,且机内冒烟。检修:开盖检查,发现视放板R970、R971烧焦,下面的电路板烧煳炭化,轻轻一动便成一洞。R938、R968也中部发黑,同时,经测量,三个视放管Q901、Q931、Q961(型号:SC3953)和三个激励管Q902、Q932、
An Internet cafe more than one Founder Aone PA448 color appeared one after another “three no” failure, some also burned a large number of components, special treatment of two typical cases of failure. Example 1 Symptom: The initial boot difficult, but occasionally bootable work, the last boot a few minutes after the “three noes” and the machine smoke. Overhaul: Open the lid inspection and found that the board R970, R971 burning, burning the following circuit board carbonization, gently move it into a hole. R938, R968 also black in the middle, at the same time, measured by the three viewing tube release Q901, Q931, Q961 (Model: SC3953) and three excitation tube Q902, Q932,