厦华XT—2580N彩电(属于二次开机机型)+5V电压由副电源变压器单独提供。用户反映开机一段时间后(有时1小时,有时更长些),不能遥控关机,其他各种功能皆正常,遥控关机后仅关掉图像和声音,屏幕仍能见到淡淡的浅紫色光栅,此时测+B电压仍为140V,即遥控关机指令未到开关管V504b极,+B电压未被切断。分析遥控关机流程如下:遥控关机时 Prima XT-2580N color TV (belonging to the second boot model) +5 V voltage provided by the secondary power transformer alone. Users reflect the boot time (sometimes 1 hour, sometimes longer), can not remote shutdown, the other various functions are normal, remote control off only turn off the image and sound, the screen can still see a touch of light purple grating, this When the measured voltage + B is still 140V, the remote shutdown command is not to switch V504b pole, + B voltage is not cut off. Analysis remote shutdown process is as follows: Remote shutdown