My kids have a Hyper X Cloud Core (KHX-HSCC-BK) gaming headset they use on PS4. One too many pulls on the cord instead of the plug rendered the right ear and microphone dead. I knew the break was near the plug because you could wiggle the cable and get intermittent sound in the right ear. Knowing this, I bought a replacement 3.5mm TRRS plug (4-pole...Right, Left, Ground, Microphone) online to make the repair.
I cut the main cable about an inch back from the plug. I found two inner multi-strand wires; a white and a black. Inside the white wire were 3 additional wires; Blue, Green, and Red/Green. Inside the black wire were 2 additional wires; Red and Copper. Therefore, a total of 5 different wires within the main cable...and 4 connection points on the TRRS plug.
There are many different variations of colored wires, depending upon your make/model headset. So unless you have the exact setup I describe below, you are going to have to test for continuity with a multimeter (on the strands that are not broken...That is, if any of them still work). I had continuity between Blue and pole 1 (tip) and Copper and pole 3 (Which is why the left ear still worked). Remaining 3 wires: No continuity (Which is why Right ear and Mic didn't work). To figure out where the remaining 3 wires went, I had to carefully grind down the plastic on the old jack with a Dremel tool to get down to the wires and connections. I determined the Following on my headset:
Red (microphone) goes to pole 4. (Sleeve, top ring, 3rd ring)
Two wires, Copper AND Red/Green (ground), go to pole 3. (2nd ring)
Green (Right ear) to pole 2. (1st ring)
Blue (Left ear) to pole 1 (tip).
Also, you will want to quickly burn the tips of the wires after you strip them and before you solder. They have a coating on them you need to burn off in order to make a good connection. This could be a little tricky if you are not familiar with this kind of thing, you don't want to damage these very thin wires. I then cleaned the wires from burning off the coating (black soot) with alcohol wipes. Soldering these small wires to the small connection points on the new jack was also tricky. (Probably not the best project for a first-timer learning how to solder.) You may find YouTube videos on this topic helpful, IE: Search "How to replace jack plug on gaming headset".
I also used a piece of shrink tubing to make the cable and new plug connection a little tighter and hopefully stronger. We are now back in action and now that I have it sorted out, future repairs (if required) will go quickly.
Bottom line: Gaming headsets cost too much to simply discard if the cable or plug is damaged. Since I already had the proper tools and solder, my cost was limited to my time and about $2 for the plug and shipping (The plug cost less than the shipping)...cheaper than buying the replacement plan. I hope you find this post helpful.
PS - What they won't tell you are the electronic stores: If you ever need an inexpensive headphones w/mic (I keep one as a backup), go to the mobile phone section. They often have ear buds w/microphone that cost under $10. They work on PS4. Often, the gaming headphones start around $50 and go up from there. Most of the employees won't think of ear buds w/mic... or if they do know, they've been told not to mention that. Just make sure it has the 3.5mm TRRS male plug.