You plug it in and the light doesn't come on, or it only charges if you wiggle the cable.
The USB-C port (micro-USB on PS4) wears out or breaks from constant plugging; sometimes it's the battery.
We replace the charging port or the battery, depending on what we measure.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.