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tech review or tear down request - Kano

shosein98

Kano computer For Kids.

My brother bought a Kano computer for my nephew for his birthday pretty cool if it worked. I found a technical issue with the crappy video controller on the screen. There is a 10 inch HDMI cable that goes from the Raspberry PI 3 to the HDMI to 40 pin  video control board. I could see lights when I plugged in the Raspberry PI on but nothing on the screen so I changed the HDMI cable to a cheap 6 foot cable I have and it worked, So I ordered a 12 inch HDMI cable from amazon to replace there cable I figured was damaged but it did not work either. I believe signal reflection is cancelling out the signal or causing an error telling the HDMI board to shut off with the short HDMI cables. I do not know how to tell which direction the reflection is happening or which board is causing the issue. Is the reflection cause signal issue in the raspberry HDMI signal or is the reflection causing the Video control board to short or error and shut off.

  • Hi Simon,

     

    It is more likely the first one was possibly faulty, and the replacement one from amazon could be any junk. You should try to get a replacement for the Kano under warranty, or contact Kano.

    They should be the ones to stand by their product. They will have tested their solution on at least one screen surely.

    I have a small HDMI-connected screen and it works fine with the two-inch HDMI connection.

  • in reply to shabaz

    I tried to keep the above short, my brother got a full replacement under warranty we swapped all the cables and the screen still did not work on the original one. I have 2 short cables from amazon one with network support and one a 1.4 HDMI cable neither of them work on the original Kano my brother bought. I will try after work to plug the PI into my TV using the short cables and test if that works. what I have looked up is the schematic for the HDMI control board and found there is a design that has anti reflection signal protection but this one is not wired that way. I followed the traces and the secondary traces that loop back for the anti reflection circuit are not there maybe the board is multi layered I can't tell that.but the HDMI board is crappy quality I was thinking off re-flowing it in my oven.