FINAL EDIT: I got the new board and all is well (I've only been printing for 20 minutes).

THANK YOU CREALITY!

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EDIT: Creality is shipping a new board! Good to see a vendor answer for their product quality! I will try to salvage this one with a connector from the 8 bit board.

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TL;DR: 24v rail welded itself in its socket with an Ender 3 Pro after a month of usage. What went wrong?

I have been running the newer 4.2.7 silent board on my Ender 3 Pro for a month now. Got it from Creality global store on Aliexpress.

Today the screen module button started clicking by itself (not sure this is related). Then I started a new print - have been printing batches of prints one after the other - and the printer just turned off.

Connected the board via USB - works (albeit the screen was dim).

The EZABL seems to light up fine - so the power supply works. The fuse in the PSU is good.

The fuse on the board was fine (albeit I still replaced it). The I saw that the 24v positive rail had welded itself in its connector on the the board side!

How can this happen? Is it just a bad socket and a board fault? Did the Ender 3 Pro overload it?! It is meant for this machine. Both terminals were tightly screwed in...

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4.2.7 melted 24v connector

4.2.7 board melted connector