it looks like the firmware doesn't respond immediately to turn on the atmega when the ON button is pressed, whether my clone is bad?? or if someone has a GM328A please test the above firmware and provide a report, if it works well on your clone, then obviously the problem is in the my hardware GM328A bad.
I do not know in what version the board of your GM328A, if, as in message 6916, then temporarily unsolder C8 10uF. Check how the tester turns on, if normal, then the reason is 7550 or S9012. About the selection of S9012 in detail at the beginning of page 278. I replaced 7550 with 7350, it works fine or look on the forum pages ...
When 5V is applied to Vcc, the "white screen" turns on, after 0.5 seconds the command to clear the screen passes and the messages are displayed as in the photo. There is no reaction to the button, since the low voltage protection is triggered. After 5 seconds, the tester turns off.
I have no testers with your display, this tester is built on ILI9341.