New Rigol dho804 oscillocope

Check the power supply - is it providing the right voltage to the main controller card?

Hello. Thank you for reply, I use the attached power supply 

Interesting.  The manual I read said it needs 15V 3A.  I don't know where table 4.1 came from, can you double check you are looking at the correct manual?  This power supply cannot deliver 4A, only 3A  (or 3.25 at 20V) so if you are right, then it's the wrong power supply.

I read this manual

Here's the same table from the manual I found: 

The newer dated manual, from their website, has the table I show below.  If your instance requires 12V 4A then you have the wrong power supply.  I suggest that you check with Rigol customer support.  Did you buy it from them?

I upload the DHO800_UserGuide_EN manual, This power supply has Type C terminal.

I bought it from local China supplier, You recommend me to change the power supply with another has 15v 4 A and test?

Looks like they gave you a wrong one. This is shown in an unboxing blog:

source: https://www.eevblog.com/forum/testgear/rigols-new-dho800-oscilloscope-unbox-teardown/msg4965181/#msg4965181

I saw a different one in a different unboxing video!!  

I would only recommend going back to the supplier or checking with Rigol support what power supply it should have based on the serial number.  If it really does require 12V you don't want to plug a 15V supply in.

I've seen 2 unboxings with that one

https://www.bilibili.com/video/BV1ox4y1R7qj/

https://www.bilibili.com/video/BV1Lz4y1E7bt/

There may be different versions out there. Did the one you see, have a good enough clarity to read the current? 

I've seen 2 unboxings with that one

https://www.bilibili.com/video/BV1ox4y1R7qj/

https://www.bilibili.com/video/BV1Lz4y1E7bt/

There may be different versions out there. Did the one you see, have a good enough clarity to read the current? 

Ok, Many thanks  I will going back to the supplier and checking with Rigol support what power supply it should have based on my scope serial number.

The author read them out and it was the same values as the label on the LiteOn one posted earlier (although it wasn't a LiteOn supply, I can't remember which now.)