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故障现象:开机后无光、无声、无字符显示,但机内有“吱吱”叫声。分析检修:据用户反映,该机是在正常收看时突然断电出现无光、无声的。根据机内有“吱吱”叫声现象分析,开关电源工作基本正常,故障可能是因行扫描电路工作异常或行输出级有短路所致。经开机检查,发现行输出管V405/2SD1555(实际为C5250)已击穿,用同型
Symptoms: no light after boot, silent, no character display, but the machine has a “creak” sound. Analysis and maintenance: According to the user reflects that the aircraft is suddenly watching normal power outages dull, silent. According to the machine there is “creak” phenomenon of sound analysis, switching power supply is basically normal, the failure may be due to abnormal work line scanning circuit or the output stage of a short circuit. After the boot check and found that the line output tube V405 / 2SD1555 (actually C5250) has been punctured, with the same type