@rickcook OK, I don't have enough to go on!
So...raise an Issue here:
https://github.com/Xinyuan-LilyGO/LilyGO-T-A76XX/issues
And pester them at sales@LilyGO.cc
The hot device has 5 pins, check your schema for it.
The big resistor is harder to find on the schema. Have you measured the resistance?
Also other LilyGO products don't like multiple power sources due to feed back.
Can you be certain that the Solar is regulated to 5V.
Cheers, Terry