My colleague is working by remote control your
laptop today. what he said is your
video card is NVS110, which is a old model and can not get new drivers from nVidia to support 800*480
I don`t know why you keep saying the EDID is missing. As I know, if no EDID there, the monitor can not display at all. We just left it blank in title, not the whole EDID is missing. They are all come from factory with EDID done, we can not change it.
Reason for picking different EDID as 31" monitor you said, is because we need it to support 1920*1080, which 7" EDID can not support. So there is nothing wrong. Also, if you connect to a computer, you need to pick "DVI" channel instead of "HDMI" channel. the HDMI channel is design for camera use.
Anyway, if you confirm the board is bad, please send back to us. We will replace for you. But looks like the problem should from your video card

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