Could you give more details please....
- Can you explain or show what the "split screen" image looks like?
- Is it a VGA monitor, or a TV/video monitor? Is there any other adaptor (apart from VGA666)?
- Do you know what video mode is being used (type "kmsprint")?
- Could you post the contents of the files "config.txt" and "cmdline.txt"?
- Are you using Raspberry Pi OS or some other distribution? GUI or command line?
But, independent of all of that... Some monitors can load H and V sync, and can be fussy about voltages. You could maybe try to solder another resistor on top of (in parallel with) each of the 120R resistors for the H and V sync lines on the VGA666 board. Perhaps with a value of 220R (for a parallel resistance of 77R). However, I don't know why this would be different for Raspberry Pi 5.
- Can you explain or show what the "split screen" image looks like? I've attached an image link to my cloud storage; ImageShack doesn't support my file.
- Is it a VGA monitor or a TV/video monitor? Is there any other adapter (besides the VGA666)? The monitor is VGA from an arcade machine called Photo Play. I found the machine's information:
VGA monitor:
Input signal 0.7V
Bandwidth 30MHz
Horizontal frequency 31.46KHz/35.2KHz/35.5KHz
Vertical frequency 50-90 Hz - Do you know what video mode is being used (like "kmsprint")? I'm a complete beginner and don't know that information.
- Could you post the contents of the "config.txt" and "cmdline.txt" files? cmdline has its original parameters and hasn't been modified. I've attached the last test I did in config.txt.
Code:
For more options and information see# http://rptl.io/configtxt# Some settings may impact device functionality. See link above for details# Uncomment some or all of these to enable the optional hardware interfacesdtparam=i2c_arm=offdtparam=i2s=offdtparam=spi=off# Enable audio (loads snd_bcm2835)dtparam=audio=on# Additional overlays and parameters are documented# /boot/firmware/overlays/README# Automatically load overlays for detected camerascamera_auto_detect=1# Automatically load overlays for detected DSI displaysdisplay_auto_detect=1# Automatically load initramfs files, if foundauto_initramfs=1# Enable DRM VC4 V3D driverdtoverlay=vc4-kms-v3dmax_framebuffers=2# Don't have the firmware create an initial video= setting in cmdline.txt.# Use the kernel's default instead.disable_fw_kms_setup=1# Run in 64-bit modearm_64bit=1# Disable compensation for displays with overscan#disable_overscan=1# Run as fast as firmware / board allowsarm_boost=1[cm4]# Enable host mode on the 2711 built-in XHCI USB controller.# This line should be removed if the legacy DWC2 controller is required# (e.g. for USB device mode) or if USB support is not required.otg_mode=1[cm5]dtoverlay=dwc2,dr_mode=host[all]dtparam=i2c_arm=offdtparam=i2s=offdtparam=spi=offdtoverlay=vc4-kms-dpi-genericdtparam=clock-frequency=13500000dtparam=vactive=640,vfp=52,vsync=64,vbp=108dtparam=hactive=480,hfp=26,hsync=3,hbp=43dtparam=hsync-invert,vsync-invertenable_dpi_lcd=1display_default_lcd=1dpi_group=2dpi_mode=87. - Are you using Raspberry Pi OS or some other distribution? I've tried using Pi OS and Recalbox. My intention is to create an arcade machine. Should I use a graphical user interface or a command line? All the tests are done using a graphical interface.
I've also included a link to an image showing how my screen looks. Changing the parameters in config.txt only changes the image size, and I end up with a split screen with two or three identical, separate images.
Statistics: Posted by luarsuen — Wed Dec 03, 2025 8:10 pm