Trying to FIX: Joblot of Faulty PS4 Controllers - PART 4

Hi, this video series shows me attempting to repair a job lot of faulty PlayStation 4 controllers. I bought 5 of them (+1 part controller) on eBay from the same seller for £70.
This video is part 4.
Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things.
I do love fault finding and trying to fix broken things so I hope that comes across in this 'Trying to FIX' series.
Many thanks, Vince.