故障现象 :开机后显示器内冒烟 ,有焦糊味散出。关机后再开机 ,机内发出吱吱叫声。故障分析与检修 :根据故障现象分析 ,该机存在严重短路 ,故障部位可能在开关电源电路或行扫描电路。拆开机器外壳 ,首先用观察法检查开关电源电路所在的电路板 ,未发现有烧毁的迹象 ;接着检查行 Symptoms: Smoke appears in the monitor after start-up and there is a burning smell. Turn off and then turn on the machine, the machine issued a howling sound. Fault analysis and maintenance: According to the analysis of fault phenomena, the aircraft has a serious short circuit, the fault site may be in the switching power supply circuit or line scan circuit. To open the machine casing, first check the circuit board where the switching power supply circuit is located with the inspection method, and no signs of burning are found; then check the line.