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例一厦华XT—6698T型大屏幕彩电,开机红、绿指示灯都亮,但呈“三无”。分析检修:电视机开机出现“三无”故障一般发生在电源、行输出及保护电路等部分。打开机壳,开机测量C526两端电压,发现134 V电压瞬间出现,但逐渐减小,说明电源部分基本正常,故障可能是由于电源负载部分异常造成保护电路动作所致。测行输出管V302(2SD1427)集电极对地正、反向阻值均为300kΩ左右
Example XURA XT-6698T large screen color TV, boot red, green lights are bright, but was “three no.” Analysis and maintenance: TV boot appears “three no” failures generally occur in the power supply, line output and protection circuits and other parts. Open the case, turn on the voltage measured across the C526 and found 134 V voltage instantaneous, but gradually reduced, indicating that the power part of the basic normal, the fault may be due to the power load caused by abnormal protection circuit. Test line output tube V302 (2SD1427) Collector to ground positive and negative resistance are about 300kΩ