e-Paper 7in5b V3 won't draw to screen

I have the Rev 2.2 board, which shouldn't have the 3.5 V / 5V issue and 7.5inch e-Paper HAT (B) with a "V3" sticker on the back of the display. I've tried using the epd_7in5b_HD_test.py and c equivalent as well as epd_7in5b_V2_test.py and c equivalent.

The "HD" example runs, but nothing is drawn to the screen. All other examples are stuck on the init call.

Is there a missing driver for version V3?

Oct 24 '22 21:10 ashleahhill

I too am having the same issue. The most I can get to display on the screen is either having it go entirely red or entirely white. I've used both the Python and C tests supplied by Waveshare, and multiple different tests:

epd_7in5bc_test.py
epd_7in5b_HD_test.py
epd_7in5b_V2_test.py
epd_7in5_HD_test.py
epd_7in5_test.py
epd_7in5_V2_test.py

Been hammering my head at this for awhile... even tried removing the extension board/white ribbon cable and still same issues. I've used both the HAT and no HAT with same results.

Dec 01 '22 01:12 godzillafan868

Exactly same here, I did many tests but none of them drew anything on the screen...

Dec 01 '22 23:12 JohannMrndn

Same issue for me. trying solution from https://github.com/waveshare/e-Paper/issues/239

Jan 17 '23 17:01 mihanich