Neon signs draw attention, but the transformer that powers them can be finicky. A systematic test helps isolate whether the issue lies with the transformer, the outlet, or the neon tube itself.
Flip the switch on the outlet feeding the transformer. Observe the neon sign. A steady glow indicates adequate power; intermittent flicker (after the normal warm‑up glow) suggests erratic current or a worn tube. If the sign remains dark, multiple factors could be at fault.
Unplug the transformer and plug it into a different outlet known to supply clean, steady current. Restore power to the sign. If the sign lights without flicker, the original outlet was the culprit. If the problem persists, move to the next step.
With the transformer unplugged, detach the neon tube. Some tubes simply slide off; others require unscrewing the clamp. Use the screwdriver to loosen the clamp, then pull the insulated wire section free.
Connect a known‑good neon tube to the transformer. If it lights correctly, the transformer is fine and the original tube needs replacement or a gas refill. If the new tube also fails, the transformer is defective and should be repaired or replaced.
Always disconnect the transformer and the sign from power before working on them.
