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NOTE: Beware if you unmount that: my lcd did not mork anymore when I remounted the whole thing. I thought it was definitively broken. It came back some days after... Don't know why.
Capacitors are added in parallel to the existing ones. Only useful for headphones. There is a drastic bass improvement.
The On button and the remote control pins are connected to the line in connector. To remove serial communication noise, I had to scratch the original (useless) line in wires.