论文部分内容阅读
用户提示:此机无图像、无伴音,经上门修理人员修理,说是电源部分损坏。修理当中损坏部分元件,最后放弃修理。检修:因该机被人修过,打开机壳检查,发现电源部分许多元件皆动过,其中电源开关管V704(2SD2334)、V702、V703(2SD965)皆被新换,测108V电源输出对地不短路。随即通电试机,只见保险F701处亮光一闪。关机检查,保险熔断,开关管V704集电极对地击穿、V703击穿。查其他相关元件无问题,换上损坏元件后,通电,电视机不起动,只得关机寻求电源不起振和开关管击穿的原因。
User Tip: This machine without images, no sound, repaired by home repairers, that part of the power supply is damaged. Repair damage to some of the components, and finally give up the repair. Maintenance: Because the machine was repaired, open the case check and found that many of the power part of the components have been moved, including power switch tube V704 (2SD2334), V702, V703 (2SD965) are new for the test, 108V power output to ground Not short-circuited. Then power test machine, saw the insurance F701 at a flash of light. Shutdown inspection, fuse, switch V704 collector to ground breakdown, V703 breakdown. Check other related components without problems, replace the damaged components, the power, the TV does not start, had to shut down to find the power supply can not afford to vibrate and switch tube breakdown reasons.