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Troubleshooting • 7" display No Signal with RPi 4 + Bookworm up-to-date

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This is an old Neewer display (around 2017) connected to a RPi 4B+ 4Gb ram with a fresh install of Bookworm 64bits on 64Gb Micro SD card.
From bootloader it hasn't EDID info.

Steps I performed after first time boot:

Code:

sudo apt-get update && sudo apt-get dist-upgradesudo nmtui #to set IPv4 to manual 
Then

Code:

sudo nano /boot/firmware/cmdline.txt
Added at the end of the line: video=HDMI-A-1:1280x720M@60D
Reboot -> No signal

Code:

kmsprint
Connector 0 (33) HDMI-A-1 (connected)
Encoder 0 (32) TMDS
Crtc 3 (100) 1280x720@60.00 74.250 1280/110/40/220/+ 720/5/5/20/+ 60 (60.00) P|U|D
Plane 3 (89) fb-id: 724 (crtcs: 3) 0,0 1280x720 -> 0,0 1280x720 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
FB 724 1280x720 XR24
Plane 57 (686) fb-id: 725 (crtcs: 3) 0,0 64x64 -> 98,98 64x64 (XR24 AR24 AB24 XB24 RG16 BG16 AR15 XR15 RG24 BG24 YU16 YV16 YU24 YV24 YU12 YV12 NV12 NV21 NV16 NV61 P030 XR30 AR30 AB30 XB30 RGB8 BGR8 XR12 AR12 XB12 AB12 BX12 BA12 RX12 RA12)
FB 725 64x64 AR24
Connector 1 (42) HDMI-A-2 (disconnected)
Encoder 1 (41) TMDS
I've been using this display since 2018 with several devices without problems. The cable is okay, it has been checked on other devices.

What else do you suggest to try?
Thank you

Statistics: Posted by marciano — Tue Apr 22, 2025 8:10 pm — Replies 0 — Views 29



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