hi there
i think the Max7456 is blown
here is how i wired it with the immersionRC VTX
i did not join DGND to AGND or DVDD to AVDD
i powerd the AVDD side from the 5v from the out of the VTX the one you use to power the 5v camera
what i dont get is if i link AVDD to DVDD and DGND to AGND i get the on screen display dut no camera
and i can still commect to it miniOSD with FTDI and update firmware and char set
i think the DVDD and DGNG are shorten now but wwill have to take it to work to see
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I HAVE the same problem, with miniosd and fatshark camera (5 volts)