Transformer vibrates, output is 5V instead of 13.8V. Free Fix: This is almost always bad output capacitors . Locate the large (1000uF to 4700uF) capacitors rated for 25V or 35V. Desolder them. You can salvage equivalent capacitors from old LED drivers, routers, or TV power boards for free. Replace all capacitors in the secondary (output) side.
While "free" rarely means a brand-new unit at no cost, you can often restore power through methods that cost nothing but your time and basic tools you likely already own. 1. The "Zero-Cost" Reset and Inspection
If you are looking to purchase the HYS3C210CS:
: Chassis ground, used to ground the circuit to the power supply's metal frame for safety or noise reduction. Free Resources & Support