Question What is the purpose of those LM7805 voltage regulators on NVIDIA cards?

Nov 21, 2018
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Hello,
I am wondering, what are these regulators powering? I've got a couple of newer Nvidia GPUs and on every one of them there is this voltage regulator, located near the video ports. Here is an example on non-working GTX 970 that I am trying to repair, on which this part was damaged:

After some measurements I discovered that the output from this regulator is connected directly to the first pin of this unpopulated J5 connector, what can be purpose of it?
 

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