Hi, i have a Sony DPT-RP1 device with exactly same issue, initially, I thought it was a magnetic thing, but researched here and some prople said that WEAK magnetic things cant harm the screen, so im still researching. Interestingly, I have 2 DPT-RP1 and this problem appeared in both.
Check this link:
https://www.mobileread.com/forums/sh...t=6922&page=19
User "arivero" says: "A weak magnet do not reverse the eink. I have tested in all the magnets I had at home." Note he said "weak", not strong...
Do you remember let your device near a strong magnetic field? The nearest magnetic thing near my device was my iPad, and I dont think that it was my iPad that caused that blank void column...
Im thinking to contact Sony or another source about this problem, but since I heard that Sony is giving up this line of products... The options are few now. I know there are a hacking team that develops new fratures for RP1, with certain knowledge about hardware and software. Maybe asking them, we can at least diagnose the causes.
Or we can ask arivero about it.
WHat you think?