black screen and beep beep only

[pasquale]

Hello everyone, I'm a technician here in Rosignano Solvay (Tuscany Italy) I have a problem with a NAVNET 3D (MCU001) It doesn't show any image on the monitor, I thought about the video card, which I replaced, but it wasn't her. I noticed that when I turn it on it emits two beeps from the control keypad, but then some beeps come from the box at a lower volume.
about four that repeat continuously... I thought about the backup battery, I measured it and it is 2.8 V. I visually checked both the power supply board (power board assembly) and the second power supply. But it's all right. It's possible that the 2.8V battery isn't making the motherboard work. Can anyone tell me what to check. Thank you and Happy Christmas

 

[Johnny Electron]

Hi Pasquale,
Is that a Kontron mPu001? or a Dux?
Can you count the beeps from the processor? It should have a repeating pattern.

 

[pasquale]

Hi Johnny, thanks for the reply.
I think it's the dux motherboard.
Tomorrow I'll check better, and count the number of beeps.
I hope to give you an answer by 11.00 Italian time.
If it's not too much trouble.

 

[pasquale]

Johnny hello,
I carried out the test to check how many beeps the device produces:
they are exactly 4 slow sound pulses. and 4 fast sound pulses.
Then I read the plate parameters, they are: S.N. 4350-2912 so it is a Kontron type motherboard the serial number is earlier than 3066.
I have another piece of data which I believe refers to the registration number it is: R66B42B616.
Unfortunately I can't verify the ID because I don't see anything.
I hope this information is sufficient.
Cordial greetings

 

[Johnny Electron]

It seems to be calling out the video card.

 

[pasquale]

Johnny hi, thanks for the reply, and the beep-beep code table.
I must have a video card somewhere, not the same but maybe similar.
If that was the problem I'll let you know.
A thousand thanks. See you soon.