Symptoms
- Bulb doesn't light even though it's confirmed good
- Bulb feels loose or wobbly even when screwed in fully
- Visible corrosion, melting, or discoloration inside the socket
Likely causes
- CommonA bent or worn contact tab at the base of the socketThis tab needs to press firmly against the bulb's base to complete the circuit.
- CommonCorrosion inside the socketHumidity or age can corrode the metal contacts inside.
- PossibleA cracked or damaged socket shellPhysical damage can prevent a bulb from seating or making contact properly.
- PossibleA loose wire connection where the socket meets the lamp's cordInternal wiring can loosen at the socket's screw terminals.
What to do
- Unplug the lamp before doing any inspection.
- Remove the bulb and look inside the socket for the small metal contact tab at the bottom.
- Gently bend the tab upward slightly if it looks flattened, using a small tool with the lamp unplugged.
- Check for corrosion or discoloration and clean lightly if minor, or replace the socket if significant.
- Check the socket's set screw or wire connections for looseness if you're comfortable opening the lamp base.
- Replace the socket with one matching your lamp's size and type if problems persist.
- Reassemble and test with a known-good bulb.
Tools and parts
- Small flathead screwdriver
- Screwdriver
Replacement lamp socketSearch: “lamp socket replacement kit”
When to call a pro
Lamp socket repair is generally DIY-friendly and doesn't typically require an electrician.
Safety
Use caution
Always unplug the lamp before touching the socket contact or opening the lamp base.