What cable to the speaker do you mean? Both speakers are on the spring contacts. It is no need to remove cable in any way to replace speakers.
The button cable glues to the housing. You need to remove the rubber seals. Carefully heat a bit and remove the cable with the buttons.
Hi, there is a lot of reasons for it. Charging port, or connector on the sub-board, or power supply. On this pic everything looks fine but it means nothing.
YouTube_Question
2021-11-26ahla maak
2022-11-05