PGTMR2
Posts: 14
Joined: Sat Jan 27, 2018 2:34 am

7" DSI Touchscreen questions

Mon May 14, 2018 2:49 am

Bunch of questions actually. What are the 2 extra wires for, it comes with 4, works with 2, what gives? Why is there a USB port on the back? Is that so you can still use a 4th from the PI? Why can't I see the bottom of the screen running Raspbian no matter what setting I try? It doesn't seem to have that issue with Retropie. All I can think if for now.

aBUGSworstnightmare
Posts: 861
Joined: Tue Jun 30, 2015 1:35 pm

Re: 7" DSI Touchscreen questions

Mon May 14, 2018 5:09 am

https://www.raspberrypi.org/documentati ... /README.md
The USB connector is for power output

Which resolution do you try? Display is 800x480pixel only!

PGTMR2
Posts: 14
Joined: Sat Jan 27, 2018 2:34 am

Re: 7" DSI Touchscreen questions

Mon May 14, 2018 10:32 pm

It won't set to 800 x 480, It cuts off the bottom of the screen. It wouldn't bother me really except for one game I like to play. This is only in Raspbian, so no biggie. I think it's going to go in my car for gaming or android auto or something. At home I have a spare monitor.

alphanumeric
Posts: 1533
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: 7" DSI Touchscreen questions

Mon May 21, 2018 9:07 am

The extra two jumpers are for the SDA SCL PIN's which are used for the very old earlier Pi models. There is a signal missing from the DSI on those early Pi models. If your Pi is anything but very old you don't need them.
If you power the display board via its Micro USB, the other full sized USB Port can be used to send power to the PI. With a USB to Micro USB cable. There are some custom short ones out there for this if you do a Google search.

alphanumeric
Posts: 1533
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: 7" DSI Touchscreen questions

Mon May 21, 2018 9:08 am

Is this a new or used screen?

PGTMR2
Posts: 14
Joined: Sat Jan 27, 2018 2:34 am

Re: 7" DSI Touchscreen questions

Tue May 22, 2018 4:09 am

Brand new screen. It works for Retropie fine shows as much screen as it can. It's just Raspbian doesn't show the very bottom of the screen, and Arduino sketches (run in raspbian,) only show up in the middle, cannot be resized.

aBUGSworstnightmare
Posts: 861
Joined: Tue Jun 30, 2015 1:35 pm

Re: 7" DSI Touchscreen questions

Tue May 22, 2018 5:18 am

Post your config.txt and an image showing Raspbian desktop on your screen

alphanumeric
Posts: 1533
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: 7" DSI Touchscreen questions

Tue May 22, 2018 8:29 am

PGTMR2 wrote:
Tue May 22, 2018 4:09 am
Brand new screen. It works for Retropie fine shows as much screen as it can. It's just Raspbian doesn't show the very bottom of the screen, and Arduino sketches (run in raspbian,) only show up in the middle, cannot be resized.
Ok, new screen, it should work in Raspbian without having to modify or edit anything. I have one of the original version one screens. I had an issue with the bezel slowly sliding down. I lost a bit at the top of my screen. It disapeard under the black boarder..

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