Quote:
Originally Posted by polinko90
I've tried looking for more cracks but I really can't see any.
Thank you.
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Cracks can be invisible to the naked eye and can require a microscope or other optical solution to spot.
Cold solder joints (component legs have separated from the solder) are almost always impossible to see by eye, and can even be hard to see with a microscope.
Your issue is most likely due to one or both of these things.
I suggest you first reflow all of the solder joints with some good quality flux and solder and then try again. Because your issues seem to center on the input board, that seems like a likely spot, especially because components that experience force (like connectors being plugged in and out) tend to have broken solder joints.