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Hello guys,
I am trying building a LCD daylight 3d printer. I am practically a noob about raspberry pi 3 and informatics. I connected the LCD via HDMI and powered but the LCD is not working. When i turn on pi, the LCD backlight turn on but the screen is totally black. If I try to display projector calibration the screen remains black, but if click on "turn off projector" the LCD turn off. Where am i wrong?
On the setup page as "Projector communication type" I use "HDMI Power On/Off".
Thank you all
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Probably nothing wrong with the nanodlp software per se, you have a problem with the LCD configuration. You need to change the /boot/config.txt file. What kind of LCD screen and HDMI controller are you using?
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Thank you ender67 for answering.
It is a 1440x2560 LCD, here it is the link where i buyed:
https://it.aliexpress.com/item/5-5-inch … fb9dJGEuG9
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I don't have this screen (I use iPad screens, Full HD screens and 4K UHD screens) but I guess the following config.txt file will work:
hdmi_pixel_encoding=2
start_x=1
gpu_mem=128
disable_overscan= 1
#overscan_left=-16
#overscan_right=-16
#overscan_top=-16
#overscan_bottom=-16
framebuffer_width=2560
framebuffer_height=1440
max_framebuffer_width=2560
max_framebuffer_height=1440
hdmi_force_hotplug=1
hdmi_cvt= 2560 1440 30 1
hdmi_group=2
hdmi_mode=87
hdmi_drive=2
config_hdmi_boost=4
hdmi_ignore_edid=0xa5000080
Maybe you will need to tune it a little bit (invert the places for "2560" and "1440" stringsboth in framebuffer lines and in hdmi_cvt ...and maybe disable_overscan=0 and put some values in overscan.... for correction).
If you put this in config.txt and reboot the rpi3 you should see the boot screen (maybe the "rainbow" screen, then the 4 raspberries and some very small text...and after a while the clear screen).
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Ok, i will try it. Thank you very much ender67!
Last edited by AntunesS (2017-10-04 17:08:15)
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Solved, thank you again ender67!!
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Hi everyone, i have the same trouble with my lcd, i try to put your config boot.txt and this almost work but with minor issues( half of the screen are ok and can't change monitor calibration).
so i take a look at https://elinux.org/RPiconfig#Which_valu … monitor.3F but don't find any solution for my case.
I will be gratefull for any help.
the LCD i got is https://fr.aliexpress.com/item/6-inch-1 … 277e&tpp=1
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HI , finally find configuration for my lcd here https://bairdlabs.wordpress.com/2017/03 … -printing/
juste add this code at end of config.txt:
hdmi_force_hotplug=1
disable_overscan=1
framebuffer_depth=24
gpu_mem=192
framebuffer_ignore_alpha=1
hdmi_cvt=1440 2560 48
hdmi_group=2
hdmi_mode=87
hdmi_pixel_freq_limit=400000000
hvs_priority=0x32ff
max_framebuffer_width=1440
max_framebuffer_height=2560
framebuffer_width=1440
framebuffer_height=2560
config_hdmi_boost=4
this should be helpfull for some people
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