There is no signal when the built-in OPS computer is turned on

A: The cable is not plugged tightly or there is a problem with the cable

The HDMI cable of the Android board 848 connected to the daughter card driver board is not plugged in tightly, resulting in no signal. There is a signal at the beginning of the boot, but there is no signal when entering the windwos system after booting.

B. Android board problem

Take a long HDMI cable and connect it to other HDMI input ports of the Android board to see if the signal is normal.

C. daughter card problem

Connect the HDMI output interface of the daughter card to other Android interfaces with a cable. If there is no signal, you can try another daughter card.