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PicorePlayer RPI4 - Touchscreen went Black !

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  • PicorePlayer RPI4 - Touchscreen went Black !

    Hi All,
    Something weird happened with my setup few days ago.
    I m using a RPI4 with Picoreplayer and a 7" Touchscreen for years without issue.
    The RPI4 and the screen have separate PSU.

    The screen went completely black! The RPI is still working well.
    I checked the screen PSU (small USB charger) and confirmed it was still working fine.
    I then decided to order a new screen, received it today, replaced it and Still the same issue!

    I really don't get it!!! Anybody to help Pleassssssssssssse !

  • #2
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    • #3
      Do you see anything at all on the screen during the boot phase?
      Do you have a spare SD card? If yes you could try making a new pCP on it or Raspberry Pi OS and see if that works.
      Paul Webster
      Author of "Now Playing" plugins covering Radio France (FIP etc), PlanetRadio (Bauer - Kiss, Absolute, Scala, JazzFM etc), KCRW, ABC Australia and CBC/Radio-Canada
      and, via the extra "Radio Now Playing" plugin lots more - see https://forums.slimdevices.com/showt...Playing-plugin

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      • #4
        Originally posted by Paul Webster
        Do you see anything at all on the screen during the boot phase?
        No nothing at all, not even a color flickering

        Originally posted by Paul Webster
        Do you have a spare SD card? If yes you could try making a new pCP on it or Raspberry Pi OS and see if that works.
        I could try indeed, nothing to lose here.... thx

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        • #5
          Tested today with a new SD card and exactly the same issue unfortunately
          I remember that in the past even with Rpi4 off the screen was flickering, here there is nothing it stays black...
          I tried a different charger for the screen, same issue.
          How can I confirm it's not an issue with the screen?

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          • #6
            It seems I fixed the issue but in a weird way...
            I had to add jumpers to take the power from the RPI4 to screen as when using a different adapter via the USB of the screen board, the screens stayed black.
            Any idea why?
            I never had to use these connections in the past.
            Last edited by sdiesel77; 2023-05-24, 22:24.

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            • #7
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              • #8
                And now, I have a power logo ⚡ appearing which means I presume the power isn't strong enough...
                I could potentially increase the voltage but I still don't understand why suddenly it stopped working with external charger...
                You may only view thumbnails in this gallery. This gallery has 1 photos.
                Last edited by sdiesel77; 2023-05-24, 22:25.

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                • #9
                  Powering the screen from gpio has always been the standard way of powering. https://www.raspberrypi.com/products...touch-display/

                  The 800 x 480 display connects to Raspberry Pi via an adapter board that handles power and signal conversion. Only two connections to your Raspberry Pi are required: power from the GPIO port, and a ribbon cable that connects to the DSI port on all Raspberry Pi computers except for the Raspberry Pi Zero line.
                  but regardless, your connections and the lightning bolt shows you don’t have sufficient power. Be careful that you don’t increase the voltage higher than spec. There are many things that can cause power to be low. Besided just a power supply that is starting to fail, it can be problems with the usb connector too.


                  piCorePlayer a small player for the Raspberry Pi in RAM.
                  Homepage: https://www.picoreplayer.org

                  Please donate if you like the piCorePlayer

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                  • #10
                    Thanks Paul for the response.
                    I tried 2 different usb chargers and none worked for the screens... it's like the USB power input of the screen stopped working....

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                    • #11
                      Anybody has an idea on What happened here please

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                      • #12
                        Can't offer anything on the black screen, but I found that the USB power supply was critical with the screen installed - an old iPad charger seemed powerful enough to me. Also worth investigating is the USB cable, thinner, longer cables don't seem as good as shorter better built ones.

                        Robert
                        Home: Raspberry Pi 4/pCP7.0/LMS8.1.2/Material with files on QNAP TS-251A
                        Touch > DacMagic 100 > Naim Audio Nait 3 > Mission 752 (plus Rega Planar 3 > Rega Fono Mini; Naim CD3)
                        2 x Squeezebox Radios, 1 X Squeezebox 3 (retired), 1 x SqueezeAMP
                        Office: LMS8.0.0 running on Raspberry Pi3; Raspberry Pi 3 player with touchscreen/piCorePlayer/IQaudIO DAC and Amp
                        Portable: Raspberry Pi 3B/pCP7.0.1/LMS8.1.2/Material, files on Seagate portable drive, powered via power brick

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                        • #13
                          Thanks Robert, I decided to order a new powerful regulated PSU of 5v -10A. A bit overkill but at least I won't have power issue anymore.

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                          • #14
                            NOTE: The official RPi4B power supply is 5.1V. The extra 0.1V is to compensate for voltage drop across the USB cable.

                            The only problem I ever have with the Official 7" screen is with the ribbon cables. The ribbon cable sometimes isn't seated properly or the ribbon cable will actually break after years of flexing.

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                            • #15
                              I am using a 5v (set at 5.3v) 2A regulated PSU but it seems that it's still not enough one the screen is connected...
                              The new 10A will not have this issue 😃

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