Power-on JLH 1969 pre-amplifier board - Part 1

Bought this JLH 1969 pre-amplifier board(USD 22.06) from Vacusg Store(www.aliexpress...)
The LED power indicator does not work. / 通电后电源指示LED不工作。
In the following video, I did further check. / 在下面这部视频中，我进行了进一步的检测：
• Power-on JLH 1969 pre-...

[@murilosantiago8132]

what is the trasformer that are you using?

[@ardenbook]

just normal Chassis Mount Power Transformer