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7" LCD Troubles



  • Hi everyone, I'm trying to get this LCD screen to work with my Raspberry Pi 3b+ but can't seem to get it to work. It seems to only want to display through the HDMI.

    There is a wiki for this screen and at the bottom it has some lines that should be edited into the boot/config file. Looking through the config file on Retropie though I didn't see a lot of corresponding lines. I saw one that matched the top one, but altering it didn't change anything. Copying and pasting the text in didn't work either. I do admit I'm just kind of fumbling around here as this is my first Retropie project (small 3D printed arcade cabinet).

    Currently using

    Raspberry PI 3B+

    Power Supply I think 2.5A that comes with this

    Retropie 4.5.1

    USB Connected, USB Speaker, Arcade Controller

    Any help would be so awesome!


  • Global Moderator

    You need to add the configuration lines posted in the wiki to the config.txt file, otherwise the screen would not be configured properly. RetroPie uses the Raspbian default configuration file, which is targeted to an HDMI Tv/Monitor.

    How are you editing the config.txt file ?



  • I plugged the micro sd card into my laptop and opened the config file from a basic text editor. I tried to look for lines that matched the ones on the wiki, but only found one that matched the top.

    dtoverlay

    So I tried updating that line and saving, then copying all of to there and saving, then adding hashtags (cause I'm really just fumbling around trying to stupid my way into a solution).

    Still couldn't get it to register the LCD display though.

    Should I be editing the file in just a text editor, or is that something I need to do through the command prompt somehow? The only experience I have with altering configs is sometimes trying get better frame rates in PC games.


  • Global Moderator

    @HAChaos said in 7" LCD Troubles:

    So I tried updating that line and saving, then copying all of to there and saving, then adding hashtags (cause I'm really just fumbling around trying to stupid my way into a solution).

    Hashtag (#) is a comment marker, whatever comes after it on that line is ignored. Add the lines from the wiki at the end of the file, just as they are - i.e. no hashtags.



  • Ah, so I don't need to replace anything, just copy and paste it onto the end of the sheet?


  • Global Moderator

    @HAChaos said in 7" LCD Troubles:

    Ah, so I don't need to replace anything, just copy and paste it onto the end of the sheet?

    Yes, just add them at the end of the file and boot again the Pi.



  • Worked perfectly. Thank you so much!



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