I have an LG LFD790 music system. It comes in four parts (2 side speakers, one sub woofer with built in amplifier and power supply and a main unit which controls the system). The main unit is connected to amplifier board using a 32 pin connector. I have lost this cable and can't find the replacement. I want to run the music system without the main unit.
By looking at the schamatic, I figured out that it uses PS9829B audio processor which run two TAS5142 audio amplifiers (one for two side speakers and another for subwoofer). TAS5142 accepts input as PWM signal. The PS9829B provides that signal to the amp from AK4683 codec IC. I want to remove AK4683 and replace it with arduino. There is a similar project defined here (https://github.com/zarpli/PS-WTX500?tab=readme-ov-file). It is based on similar architecture but the problem is I can't find place to solder wires from arduino (The connections are different).

PS: The service manuals are attached

 

That system is very complex and it looks like multiple processors.I suggest purchasinga new cable, which will result in finding the missing cable.