What are the main reasons for these connectors burns??

[IIIIIIIIII]

 

 

 

1.

Is it simply a cheap terminal and housing of connectors?

 

I don't know about the second photo(seasonic fx), but the user of the first photo was using all 8 SATA connectors and both connectors melted.

 

 

2.

https://imgur.com/a/x3ld2zC

For these photos, they were using a group regulation PSU that did not have OCP on the minor rails. I predicted the cause of it was because the HDD was short-circuited from the inside. Is my prediction correct?

Edited October 31, 2021 by IIIIIIIIII

[Guest]

Poor connection causes this. Corrosion on the connectors can cause this. Too much load can cause it. 

[Kilrah]

33 minutes ago, IIIIIIIIII said:

the user of the first photo was using all 8 SATA connectors and both connectors melted.

Using them for what? Likely too much load, which would be surprising if they were used with HDDs.

 

33 minutes ago, IIIIIIIIII said:

I predicted the cause of it was because the HDD was short-circuited from the inside. Is my prediction correct?

If that was the case you'd see evidence on the HDD, we can't see them so no idea. 

[IIIIIIIIII]

33 minutes ago, Kilrah said:

Using them for what? Likely too much load, which would be surprising if they were used with HDDs.

Not exact, but probably 8 HDDs.

[electropical]

The first one, that's 2 separate PSUs.
On the Seasonic one, the molten pin is the 12V pin.
Mining using SATA to PCIe adapter?

[IIIIIIIIII]

19 minutes ago, electropical said:

Mining using SATA to PCIe adapter?

I don't know, I asked in the comments, but I haven't received an answer yet

But perhaps not.

[Juular]

Mining. No way you overload the peripheral power connector by using it for HDDs as you're supposed to. It's MOLEX/SATA to PCIe adapter.

[f14]

poor connection/bad crimp  ( make high resistance) + high current flow in longtime ( it hotter day by day ) = burn out
if it happened too soon = overcurrent flow (mining)