I have 2x 7inch touchscreens laying here. (Original raspberry touchscreens) I always had one connected to a raspberry. The other one was backup. After I connected the backup one to the raspberry, my SD card went corrupt.

Now I tried everything to get one of the two touchscreens working with a fresh install of raspbian. Both don't work. Tried updating raspbian etc. Nothing has worked. The DSI boards don't have a light so I can't see if they are broken.

The raspberry does not recognize them with:

dmesg | grep -i ft5406

So I think it might be the touchscreens that are broken.

Is there anyway to trouble shoot this?

Thankyou, Rick

  • I doubt 2 touchscreens would go caboom simultaneously. Most probably the DSI controller on the RPi broke down. Try connecting your screens to a different RPi if you have one. Feb 8, 2017 at 9:21
  • Hey Dmitry, thank you for your response! Tried it with 3 different raspberry 3's. I did connect 5v and gnd turned on the wrong connections. But I thought they would have protection for that.
    – Rick
    Feb 8, 2017 at 9:29
  • Measure voltage on your raspberry pins first.
    – jaromrax
    Feb 9, 2017 at 15:27

2 Answers 2


Might be work checking you have the cable the right way round though as it's not obvious (to me at least) which way round it's supposed to go.

I agree with the commenter that it's unlikely both screens would fail at once. Best way to confirm is to get a second PI and test with that, as it could be your DSI socket has failed (unusual, but not impossible).

I know Pis are hard to get hold of right now, but there are some reasonably priced second hand Pi 2s to be had on ebay. Although original Pis have a DSI port, I'd not recommend them for testing as I've had issues getting DSI to work at all on an original A+. I do have a Waveshare DSI display running fine on a Pi2 though, so you'd probably be OK with one of those.


Check to make sure you plugged them into the right pins and that the connections are secure. If you didn't, there's a chance that you could have destroyed them.

  • It's a DSI connected screen - no pins to misalign.
    – Christi
    Oct 1, 2022 at 9:03

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