Hi, it's 2023, i think maybe it's too late to reply. I just got one epl5 and the lcd turned dark after one flip, but the touch function remains, so I belive that the cable is harf broken, and starting to find a tutorial to fix it. sadly, I could not find any informations in detail, and I met the same problem at the exactly same position. so I did some test very carefully, but find out that problem is very easy to be done. I took some pics as followed.
The reason we can't disassembly the back of the lcd is, 2 screws are hidden beneath the rough-black-plastic-like stick paper. and it can be removed easily.
good luck and enjoy your DIY.
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