Hello, I’m a newbie here. I have to reverse engineer an LED driver pcb to a schematic and simulate the schematic afterwards but I’m having trouble figuring out what type of transformer is this? I believe it's a flyback transformer but not sure if it's right. It has 9 pins, 5 on one side and 4 on the others. Appreciate it if anyone could help.

 

To start with, it is a High Frequency device, likely a few 10's of KHz.
It is, in all probablity, a transformer (can be a choke or EMI filter).
Only some pins may be wired. The photo shows the last pin on the right is a dummy.

It is a custom made device for this LED driver and specifications are not likely to be available.

 

Some inductance measurements between the pins would help.
(If you're going to do a lot of this, get an LCR meter)

 

How far have you got with the schematic? Sharing that, plus idents for themain controller chip would help to determine the likely characteristics. In the meantime, resistance measurements between pins would determine structure. Some values may be below 1ohm so be sure to distinguish between those and a true short circuit. Use a table like this to document your results:

resistance pin to pin​	1​	2​	3​	etc...​
1​	X​	​
2​		X​
3​			X​
etc...​				X​