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故障现象:一台成都C47—851彩电,开机时一切正常,约十分钟左右突然无光栅、无伴音,机内有吱吱叫声。分析与检修:该机是三洋83P机芯,其开关电源、行扫描电路均无过压、过流保护电路,因此不能用检修其它彩电的方法来检修该机。从开机到出现故障的时间一次比一次短,说明该机有随温度升高而性能变坏的元件,机内在故障状态时有吱吱叫声说明开关电源负载较重。由于行扫描
Symptoms: a Chengdu C47-851 color TV, boot everything is normal, about 10 minutes suddenly no grating, no sound, the machine has a cheep. Analysis and Maintenance: This machine is Sanyo 83P movement, the switching power supply, scanning circuit line no over-voltage, over-current protection circuit, it can not be used to repair other color TV methods to repair the aircraft. From start to failure time shorter than once, indicating that the machine has a deterioration with temperature and deterioration of the components, the internal state of the machine when there is a cheep squeak heavy switching power supply. Due to line scan