故障现象:据用户反映:“最近维修员上门修过两次,每次修完后,用上一个星期左右就又犯不能开机的老毛病”。听完用户叙述,觉得此故障的根源没有找到,一定是另有隐情。将机器拆开后发现“行管”被换过且已经击穿,行部分及电源部分都被“扫荡”过,电路接触不良及“行管”本身原因造成的烧“行管”可能性已被排除。 Symptoms: According to the user reflects: “Recently repaired home repair twice, after each repair, with a week or so again can not boot the old problems ”. After listening to the user’s description, I found that the root cause of the failure was not found, there must be another hidden secret. After the machine was disassembled and found “line control ” was replaced and has been breakdown, the line part and the power supply part have been “raiding ” over, poor contact with the circuit and Possibilities for “Goverment” have been ruled out.