iMac 5k late 2015 Question

[xxxnotion]

Hello.
Can you see this?
Did the PCH go off?
I'm trying to replace the broken part myself. Can you give me the name of the part?

PCH? Please also tell us the name of the yellow resistor below.

 

[xiaosongz]

sorry, I was wrong.

I have no idea about where to buy this.

 

[ptfuzi]

That looks like a south bridge.