Hello Yuriy_K,
I tested your firmware ST7735_RGB_en16MHz again with changed ext. fuse, - low fuse and high fuse are the same as before and in your posted picture. When I start the tester only the backlight of LCD switched on. Nothing others happens. As you can see: board is GM328A-kit and LCD is with ST7535 driver. I think, your vers. of firmware is based of K-H Kuebbeler's firmware. I wonder, when I flashed firmware 1.13k, all is ok. What could be the reason for this mistake? Curiously is, after starting the tester, led goes on - but by pressing the knob short or long - led and LCD staying on.
Best wishes