BIGD53
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Raspberry Pi 7inch Touchscreen not working

Sat Jun 09, 2018 11:34 pm

Hello,

I have recently purchased a raspberry pi 7inch touchscreen. It was working fine yesterday but today when I plug it in it shows grey-black lines then it goes completely black. The red power light does not come on when the pi is plugged into the screen. I have my pi wired via GPIO pins and a DSI ribbon cable.

Thanks
P.S. - I am using a RPI 3 model B

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DougieLawson
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Re: Raspberry Pi 7inch Touchscreen not working

Sun Jun 10, 2018 11:48 am

Pull the ribbon cable and re-seat it at both ends.
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BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Sun Jun 10, 2018 2:14 pm

Thank you. :D I have tried this on multiple occasions already and found that I needed a new cable. So I have a new cable and I have re-seated it multiple times. I don't think the cable is a problem anymore. Could the screen need a firmware update or something of the sort?

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DougieLawson
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Re: Raspberry Pi 7inch Touchscreen not working

Sun Jun 10, 2018 2:16 pm

Get a copy of Raspbian, Etcher and a fresh new SDCard.
Try booting that.
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BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Sun Jun 10, 2018 2:20 pm

I will try this tonight. Thanks. I'm not sure if it is the problem though because the green light comes on which means it registers the sd card. I have also accessed my pi via hdmi and it worked fine.

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DougieLawson
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Re: Raspberry Pi 7inch Touchscreen not working

Sun Jun 10, 2018 2:53 pm

Before you attempt to diagnose ANY hardware anomaly you need to be sure the software/firmware is working. Getting a fresh copy of Raspbian is a way to ensure that.
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BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Wed Jun 13, 2018 3:29 pm

Got it. I am currently ordering a micro sd card on Amazon. I will test the new rasbian soon.

BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Tue Jun 19, 2018 6:44 pm

I have officially reinstalled rasbian on my pi and I have completely set it up. When I plug in the screen I still get the same result. The red light goes out and a lighting bolt appears on the hdmi screen I have hooked up.

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DougieLawson
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Re: Raspberry Pi 7inch Touchscreen not working

Tue Jun 19, 2018 7:26 pm

If you have an active 7" touch screen you can't have an active HDMI display. It's one or the other with the standard display drivers.
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BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Tue Jun 19, 2018 7:36 pm

I unattached the hdmi cable and the screen comes on but it is white with vertical grey lines.

gkaiseril
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Re: Raspberry Pi 7inch Touchscreen not working

Tue Jun 19, 2018 7:45 pm

I have a Pi 3B+ attached to the 7 inch touch screen. the only time I get the gray lines is with Noobs booting and Noobs booting the selected OS. My screen does not work if I switch the pins the power jumpers are connected to. Make sure you are only using the Gnd and the 5 vdc pins on the lcd screen and the Pi's GPIO pins. It is also possible to power the Pi and the touch screen using the power micro USB ports and two power supplies or one power supply and a micro USB Y adapter.

BIGD53
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Re: Raspberry Pi 7inch Touchscreen not working

Tue Jun 19, 2018 7:55 pm

I have made sure the cables are connected to the right gpio pins on both the pi and the screen. When I tried supplying the screen and he pi with power the pi seems to boot fine but the screen becomes very hot and it smells like it might be burning.

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