Hello everyone,
I would like to share my experience, maybe someone has already done it. I have been using Pi3B+ with Hyperion NG for a long time and I was constantly wondering how to simplify the whole hardware and solve the problem with DRM. I spent a long time finding information that would help solve these problems. By chance, I found information related to the method of capturing image content using the LVDS to HDMI converter module. After studying the documentation, I decided to buy such a converter and experiment. I found the service manual of the TV that I have, HISENSE 65A6N, and after a few days of analysis, I decided to connect to the motherboard in the TV. I am an electronics engineer, so the topic was not too complicated. After two days, I managed to connect correctly to the LVDS signal output, which resulted in full success in obtaining 1080p resolution on the converter's HDMI output. The hardware configuration is as follows: from the motherboard => LVDS/HDMI converter => HDMI/USB grabber => Pi3B+ and that's it. LED strip controlled by WEMOS D1mini (WS2811/60led.m).
The effect is that everything displayed by the matrix is processed perfectly into a glow, all applications work as they should. At the moment I have not noticed any problems.
The whole concept is rather intended for more advanced users due to interference with the TV's motherboard, but those who are familiar with electronics should not have any major problems.
That's all for now, I am attaching a link to the converter:
Best regards 