TCL LE50D8900电视机电源板维修

lxmlxm

这台电视机有时开机，有时指示灯不亮不开机，不开机时，5SB电压5V，PS电压3V左右。12V，5V，24V没有电压，现在已确认是电源板问题，就是找不到原因，请师傅们分析一下，谢谢了，下面是图纸和实物哦图。

湖北黄冈信得过

上示波器，一下就OK！问题是故障点要 明确范围

litiangao

IC2的8脚供电，IC3的12脚供电都有了吗

sysh24123

400V正常吗？

mariano

if you have PS 3 volt that must activate Q14 so that the optocoupler UF1A turns on that activates the UF1B and Q10 then you will have voltage vc pfc and vc pwm

wim

Thank you for your post.

lxmlxm

PFC电压正常375V，两个IC电压没测，我今天测一下，我估计与电容有关，或者是漏电，有时开机就正常，正常了只要不关机就能看。

mariano

Does pin12 of NCP1396 and pin8 of NCP1653 have voltage of vcc? With a simple multimeter you can measure. Just look where you put the multimeter gnd. if there is no vcc the ic will not start is the first condition you need.

lxmlxm

PFC 开机时370，不开机时360v

lxmlxm

国外朋友的帖子内容看不懂，谁能翻译一下，谢谢了。