what is this component ?

[pakcomputers]

The board is an inverter for 4 bulbs on a 15" screen.
The board is a TDK PCU-P154E inverter.

The device is marked "45", and it is 2.8 x 2.4mm

I believe this is a fuse, perhaps 4.5A ???

It is connected directly to the Vcc into the board and it is open.
The board draws 1.7 amps, and it seems to function normally when I
bypass the device.

Any thoughts on what it is ?

[stj]

Re: what is this component ?

it may be a circuit protector.
if it is then it's NOT the current on it - you need a datasheet to decode the numbers.

[R_J]

Re: what is this component ?

I just repaired one of these inverters, the current when operating was about 1.8 amps
Looks like it could be made by KOA, series CCP2 B or E. [45] looks like 2.5 amp current rating, fusing cuurent is 4.5 amps.

http://www.koaglobal.com/product/fuse