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  1. #1
    Junior Member
    Join Date
    Sep 2018
    Posts
    10

    Need Help for configure 4 inch screen on pi4 and PCP6

    Hello, I have pi3 with picoplayer 6 to install on it. I also have a 4 inch screen from the brand "waveshare": https://www.waveshare.com/wiki/4inch_HDMI_LCD

    After configuring the config.txt file on picoreplayer, I have the display that works correctly through the pi3's HDMI port, jivelite also works.

    I just bought a pi4 and I connected the screen still in HDMI to the HDMI0 port of the pi4 and I have nothing displayed on the screen. Not even the rainbow when booting the pi4 .
    And yet picoreplayer starts well, I can listen to music without problem.

    I then decide to connect the HDMI0 port of pi4 on my 65 inch Sony TV, the display works correctly, jivelite too.
    Just a screen orientation problem, but it doesn't matter.

    I specify that the 4 inch screen is powered by an external 5v power supply and not by the pi4 usb port.

    I then reconnected the 4 inch screen to the pi3 and it works.

    There is therefore a driver or parameter problem in config.txt to operate the 4 inch screen on the pi4.

    Here is an excerpt from my config.txt file :

    #Custom Configuration Area, for config settings that are not managed by pCP.
    #pCP will retain these settings during insitu-update
    #---Begin-Custom-(Do not alter Begin or End Tags)-----
    #hdmi_ignore_edid=0xa5000080
    hdmi_force_hotplug=1
    hdmi_group=2
    hdmi_mode=87
    hdmi_cvt 480 800 60 6 0 0 0
    hdmi_drive=1
    dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,spe ed=50000,keep_vref_on =0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900, ymin=200,ymax=3900
    display_rotate=3
    #---End-Custom----------------------------------------

    I added the command hdmi_force_hotplug = 1, and uncommented above in the file the command config_hdmi_boost = 9 but it still does not work.

    Thanks for your help.
    Last edited by julien29; 2020-04-02 at 13:43.

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