Troubleshooting - Harman Kardon GO+PLAY don't work - repair and rework

Troubleshooting - Harman Kardon GO+PLAY don't work - repair and rework
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With portable Bluetooth (BT) speakers, the battery is an extremely important factor. It does not affect the sound quality but it greatly affects our experience.
When the battery is low, some speakers sound smaller than normal and can not be loud to the road despite having a direct power plug. For example, portable speakers from B&O, Sony, Denon, ... This is not an error, but the manufacturer intended to do so to protect the battery of the speaker.
And about the battery problem, broken battery of the speaker. The phenomenon that you only use a while is the power down or push the power button or plug the power directly without going up, most of which is due to the battery failure.
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