Hi,
I followed the advice on the thread in this same topic for the repair of the Sony Bluetooth speaker SRS-BTX500 adding the 1 MOhm resistor. I have the BTX300 and the two models are almost identical.
It seems to help to turn on the device, however, it turn off itself after 10 seconds of running with a fully charged battery and refuses to turn back on.
To turn on again I have to disconnect the battery, wait a day, plug-in the battery again and push the power button, works for about 10 seconds and quits again.
I did a physical inspection, checked all push buttons and switches working as expected, nothing wrong at first sight.
Any advice on how to continue the troubleshooting is very welcome.
Thank you.