I've been asked to look at a CFL floor lamp. It's many (5-10) years old and one day stopped working; it simply didn't turn on. The fluorescent bulb (four short (5 inch?) tubes extending from a plastic base with a single four pin cluster) was taken to a store and it did work there, but the bulb's whereabouts is currently unknown.

Randomly probing *between pairs* of the four holes in the lamp socket at random shows between 5 and 15 VAC, but nearly zeros DC.

Is this lamp likely to have user-serviceable parts inside, like ballast for example? Or is the only course of action to buy a new CFL bulb and see what happens?

[![business end of a CFL floor lamp](https://i.stack.imgur.com/4TW5Qm.jpg)](https://i.stack.imgur.com/4TW5Q.jpg) [![CFL floor lamp socket](https://i.stack.imgur.com/zaQLwm.jpg)](https://i.stack.imgur.com/zaQLw.jpg) click for full size

**update:** based on helpful suggestions from @ I've opened the base of the floor lamp and there's a whole circuit board full of components!

There's a small fuse(?) labeled F1. My low quality DVM reads 0.7 Ohms when I touch the probes together and the same 0.7 Ohms when I touch them to either side of the fuse. Yes it's still in the circuit, but it *at least suggests* the fuse might be okay.

click images for full size 

[![circuit board in a CFL floor lamp](https://i.stack.imgur.com/Hltu2.jpg)](https://i.stack.imgur.com/Hltu2.jpg)

[![circuit board in a CFL floor lamp](https://i.stack.imgur.com/rRONwm.jpg)](https://i.stack.imgur.com/rRONw.jpg) [![circuit board in a CFL floor lamp](https://i.stack.imgur.com/FaGqum.jpg)](https://i.stack.imgur.com/FaGqu.jpg)

[![circuit board in a CFL floor lamp](https://i.stack.imgur.com/RKGCLm.jpg)](https://i.stack.imgur.com/RKGCL.jpg) [![circuit board in a CFL floor lamp pair of BUL128A transistors](https://i.stack.imgur.com/8wTFjm.jpg)](https://i.stack.imgur.com/8wTFj.jpg)