: If that thin blue wire is frayed or the center pin in the plug is bent, the laptop will not receive this ID signal. To protect its internal circuitry from an unknown power source, the laptop will often still run off the adapter but will refuse to charge the battery and may throttle CPU performance.
That is a drain wire or shielding. It is connected to ground (GND) and helps reduce electromagnetic interference. Solder it to the same spot as your black ground wire. 3 Wire Dell Laptop Charger Wire Diagram
The center pin contains a inside the adapter’s connector. It sends a 64-bit serial number and wattage rating (e.g., 65W, 90W, 130W). : If that thin blue wire is frayed
| Connector Contact | Likely Wire Color (Dell OEM) | Voltage / Signal | |------------------|-------------------------------|------------------| | Outer barrel | Red or White | +19.5V | | Inner ring | Black or bare shield | GND | | Center pin | Blue, Yellow, or White | 1-Wire Data | It is connected to ground (GND) and helps
