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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

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  • 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.
    – Dmitry Grigoryev
    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

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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.

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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.

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

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