Chosen Solution

As you can see in the photo below, my apple watch series 4 (40mm gps) has a vertical white line permanently on the display whenever its on. I was wondering if there are any possible cheap solutions I could try before resorting to a full on screen replacement. It almost appears as those a connector cable for the display may be damaged. Also as a side note, apple warranty is not an option, I bought this watch intentionally on ebay.

Best option here is to return it! As this sounds like a minefield! Update (04/19/2020) If any of these cables are damaged it not worth repairing

What if one of the external flat connectors in the picture is cut? (The two connected to the patch over the 3 cables going to the lcd). Would it create white lines?