Possibly some of the connections are wrong, which control the PA.
I have swapped the UHF and VHF PA control pins, and I can now create some power on both VHF and UHF, but I now have some other problems, because I don't think the radio will receive.
I will need to do some more testing later, after I finish work.
I think it may be necessary to look at this problem from a perspective. Allow some time and resume again. These devices are so small that we can run into problems simply because the data bus is slightly moved.
It's really complicated to do anything on this scale.
I made another video of the DM-1801, showing some operation of the OpenGD77 on this hardware and also a lot of information about the hardware and the differences with the OpenGD77 on this radio
I made another video of the DM-1801, showing some operation of the OpenGD77 on this hardware and also a lot of information about the hardware and the differences with the OpenGD77 on this radio
Right now I couldn't hear the video but I saw that the work you did is huge. You have the screen working, the RX working, and I still think the TX should work too.
When I leave work, I can hear the explanations ...
Don't leave the project, you're almost done!