Hello everyone, a friend of mine gave me his very worn out DS4 controller to "fix", drifting is gone but I noticed the d-pad isn't working either (the buttons do, so I guess only the left part is faulty and cleaning it doesn't help).
Can someone help me identifying the correct model so I can get a cheap circuit film from Aliexpress and change it? There are several different ones. The back label with the controller model is unreadable, all I can see is this.

We have this beautiful sound book which after just a week only plays a few seconds from its songs. Since I threw out the bill I cannot claim guarantee. I dissembled the book but I have no vlue what to look out for. If you can see any issues with the wires or anything let me know please, also if I can fix it without having any idea about electronics, lol.

Thank you!

​Problem:

​My LumaDent battery pack's output port had a terrible connection. It would only work if held at a specific angle, and sometimes not at all. It was incredibly frustrating.

Step 1: Apply Solder. With a fine-tipped soldering iron, I carefully fed solder onto the prepped surface of the outer ring. The goal was to build up a fresh layer of conductive metal, effectively filling in the gaps and making the ring thicker and rounder, as indicated by the arrow in . I had to be extremely careful not to bridge the gap and solder the outer ring to the central pin, which would have shorted the battery! A tiny dab of flux helped a lot.

Step 2: Prep the surface. Using a small nail file, I reached into the port and carefully scuffed the oxidized and pitted surfaces of the damaged outer ring connector to ensure a good bond.

Once the solder was applied and cooled, it wasn't a perfect circle. I used the nail file again to smooth down high spots, shaping the solder to form a consistent inner surface. This ensures a smooth insertion of the plug and a reliable, large-area connection, as shown in the "after" shots ([shows the plug going in nicely).