Hi, I disassembled the device and found that the wires were very interlaced. Some seamed like having lost their isolation. I carefully spread the wires apart and connected the micro-USB charging cable. The red light went solid red and it's charging again. It is too small for me to replace those wires and solder them so I do not know how long and if it will work after reassembling. But al least, I set a diagnostic for the poor craftsmanship of Sony for such an expensive device... :-(
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