Because it looks exactly like that - if you look at the small blue capacitor you will see that it's rated at 2KV or more (if you can find values on it). Also you said it's from a printer lamp, which will have been a CCFL and require such a high voltage to work.What do you think the voltage in and out might be on something like that.
The dinky little tube is smaller than a straw.
It's a switch-mode transformer, and will be custom designed for that application - they require electronics to drive them, and are useless for anything else.I was hoping I could get the specs on that transformer and possibly use it somewhere else.
If I have this right I'm seeing more resistance on the secondary which tells me it's a step up transformer.The inverter board powers your backlight by drawing direct current from the motherboard and converting it to alternating current, a much higher voltage.