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sorry my answer was late.
It seems that the device is not booting normally.
There are three possible causes of the symptoms you mentioned.
1. If the SD memory card cannot be recognized properly inside
2. If the internal HDMI cable is disconnected or the contact is bad
3. If there is a problem with the motherboard

If possible, open the back and check if the cooling fan operates normally when the power is turned on.
If the cooling fan is working normally, it is most likely a problem with the HDMI cable. In this case, try reconnecting the HDMI cable or test with a new cable.
If the cooling fan does not move, there may be a problem with the SD memory card or the motherboard.

If the screen does not come on even after replacing the cable or the cooling fan does not work, please contact us again.

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 > Hello.
> I'm using Smart Monitor Target_24
> From today
> "GP" is displayed when the switch is turned on.
> After a few tens of seconds、
> "신호 없음" is displayed and the screen disappears.
> Is there a way to reset the system from the controller?
> Need repair?
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