RetroPie forum home
    • Recent
    • Tags
    • Popular
    • Home
    • Docs
    • Register
    • Login
    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    Strange Issue with CRT

    Scheduled Pinned Locked Moved Help and Support
    raspberry piretropiearcade240poverscan
    25 Posts 5 Posters 9.0k Views
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • akafoxA
      akafox
      last edited by

      I use and old CRT on for my raspberry pi 3 here is my settings:

      1. This is setup of a NTSC crt tv your settings will differ based on your country
      2. The bolded info is one that solved my problem
      3. This is for crt TV NOT an arcade monitor I am not responsible for any damages!

      (More here: raspberry pi config.txt)

      #uncomment for composite PAL
      sdtv_mode=0
      sdtv_aspect=1
      overscan_scale=1

      #uncomment this if your display has a black border of unused pixels visible
      #and your display can output without overscan
      #disable_overscan=1

      #uncomment the following to adjust overscan. Use positive numbers if console
      #goes off screen, and negative if there is too much border
      overscan_left=10
      overscan_right=10
      overscan_top=-8
      overscan_bottom=-4

      #uncomment to force a console size. By default it will be display's size minus
      #overscan.
      framebuffer_width=720
      framebuffer_height=480

      People want things easy...but then complain that life is boring...

      edmaul69E GalagaG 4 Replies Last reply Reply Quote 0
      • edmaul69E
        edmaul69 @akafox
        last edited by

        @akafox he has to do the 320x240 mode not 640x480 because of his 15khz arcade monitor

        akafoxA 1 Reply Last reply Reply Quote 0
        • edmaul69E
          edmaul69 @Galaga
          last edited by

          @galaga can you look and see if any caps are blown? I think this might be a problem with the monitor and not the pi. Even if the original game board you used didnt show an issue. Its been a good many years since i worked on arcades so i am fuzzy on the cause but it is something i have seen before.

          GalagaG 1 Reply Last reply Reply Quote 0
          • akafoxA
            akafox @edmaul69
            last edited by

            @edmaul69 I am aware of that...I just didn't know the resolution settings for the monitor.

            Question..will the pi burn out a arcade monitor like it will an old crt TV?
            Or is an arcade monitor more "like a PC monitor"?

            People want things easy...but then complain that life is boring...

            M 1 Reply Last reply Reply Quote 0
            • GalagaG
              Galaga @edmaul69
              last edited by

              @edmaul69 I haven't taken the chassis out but I can't see anything wrong. I've never replaced caps on anything before so doing a cap kit is really scary lol. You think I should take it out anyways?

              1 Reply Last reply Reply Quote 0
              • GalagaG
                Galaga @akafox
                last edited by

                @akafox I will try adding the overscan parts in config.txt and see what happens.

                1 Reply Last reply Reply Quote 0
                • M
                  maxriptide @akafox
                  last edited by maxriptide

                  @akafox while pc monitors (multisync monitors) are usually protected against out-of-spec signals and may display a message such as "signal out of range", an arcade monitor may be damaged if an out-of-spec signal is sent to it. If you see a scrambled image on your monitor you'd better switch it off as soon as possible.

                  Adding overscan will prevent you from getting a pixel-perfect image.

                  1 Reply Last reply Reply Quote 0
                  • GalagaG
                    Galaga @akafox
                    last edited by

                    @akafox said in Strange Issue with CRT:

                    overscan_left=10
                    overscan_right=10
                    overscan_top=-8
                    overscan_bottom=-4

                    I added those lines in config.txt and it made no change :(

                    1 Reply Last reply Reply Quote 0
                    • GalagaG
                      Galaga @akafox
                      last edited by

                      @akafox Actually I added the framebuffer lines under the overscan lines (used 320 and 240) and it fixed the issue! But only in the terminal...

                      1 Reply Last reply Reply Quote 0
                      • GalagaG
                        Galaga
                        last edited by

                        Any suggestions?

                        1 Reply Last reply Reply Quote 0
                        • akafoxA
                          akafox
                          last edited by

                          strange..are using advmame? you might have to tweak the settings in the admame.rc

                          People want things easy...but then complain that life is boring...

                          GalagaG 1 Reply Last reply Reply Quote 0
                          • GalagaG
                            Galaga @akafox
                            last edited by

                            @akafox No, RetroPie is completely ignoring the config.txt settings...

                            1 Reply Last reply Reply Quote 0
                            • GalagaG
                              Galaga
                              last edited by

                              Ok I think I finally fixed it to the point where it doesn't make me angry. I decided to try someone else's config.txt as mine was cursed or something :P I went here: https://www.dropbox.com/sh/6hdpa7893c3ked1/AABCXqUHjXI-C3PUdcq4f8jya?dl=0 and downloaded the "custom_res" config. I renamed it to "config.txt", changed the resolution to 320x240, and added some custom overscan numbers. The lines are still there, but they don't affect the text and only appear on a black screen. I'm sure I could go further and 100% fix it but right now I'm happy. Whew!

                              1 Reply Last reply Reply Quote 0
                              • First post
                                Last post

                              Contributions to the project are always appreciated, so if you would like to support us with a donation you can do so here.

                              Hosting provided by Mythic-Beasts. See the Hosting Information page for more information.