Display NHD-4.3-480272EF-ASXN#-T and NHD-4.3-480272EF-ASXN#-T revA
Hello,
We manufacture a device based on a RPi 3 Model B and we use the display NHD-4.3-480272EF-ASXN#-T. Recently we have updated kernel to version 4.18.20-v7+ and in some devices we are experiencing display problems... After some investigation we saw that our devices were using 2 different revisions of the display:
NHD-4.3-480272EF-ASXN#-T and NHD-4.3-480272EF-ASXN#-T revA
Both of them purchased to Mouser with the same product reference in their catalog.
The current configuration in the file /boot/config.txt regarding HDMI is:
hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode= 87
hdmi timings is:
hdmi_timings=
<h_active_pixels> 480
<h_sync_polarity> 0
<h_front_porch> 1
<h_sync_pulse> 41
<h_back_porch> 2
<v_active_lines> 272
<v_sync_polarity> 0
<v_front_porch> 2
<v_sync_pulse> 10
<v_back_porch> 2
<v_sync_offset_a> 0
<v_sync_offset_b> 0
<pixel_rep> 0
<frame_rate> 60
<interlaced> 0
<pixel_freq> 9009000
<aspect_ratio> 3
and regarding colors, we have:
framebuffer_depth=32
framebuffer_ignore_alpha=1
we also have (but I am not sure if related...)
enable_uart=1
dtoverlay=pi3-disable-bt
dtoverlay=pi3-miniuart-bt
Please, have you any idea to overcome this problem??
-
The revA version of the NHD-4.3-480272EF-ASXN#-T TFT now uses a Sitronix ST7282T2 controller that replaced the Himax HX8257-A controller on the original vesion of the 4.3" TFTs.
Please see the Engineering change notice on our website that was sent out to customers purchasing this display: https://support.newhavendisplay.com/hc/en-us/articles/4414855613719-ST7282T2
The image below shows the RGB timing characteristics for this display.
Please see the current datasheet for more details: https://newhavendisplay.com/content/specs/NHD-4.3-480272EF-ASXN-T.pdf
Best Regards,0
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