Hi Andrew,
I found your post while searching for a solution to the exact same issue with the exact same product, bought off Amazon in late 2019. It's never worked and I too have tried using another lcd to test it and it still hasn't worked. I've searched on and off for a potential solution but this is the first post I've found that mentions the exact same product.
Did you happen to find any working solutions or explanation for this?
Best Regards,
Max.