I have no idea how the PCB got this effect.
this post was submitted on 13 Jul 2023
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That’s a pretty significant failure, Jesus.
Yea, looks like over-volting damage. Maybe the voltage regulator failed. Just my guess
That's what I thought. Maybe due to voltage spike in the house. But it is definitely strange. Never seen something like this since I started studying/working with electronics for the past 8 years.