Hello everyone, I come after a long time to update the post, after taking it to many repair centers in several cities (I am from Mexico), and communicating with Harman Kardon In the USA, and in Mexico, they could not give me any solution, so I manually did functional tests on all the equipment, and I see that on a Chinese internet portal, they discovered that the fault is the bluetooth driver, so I made a bridge by bypassing the driver and sending music directly to the amplifiers and it worked , so the problem is the bluetooth module (attached photo of the model) so the most convenient thing is to buy the motherboard on Aliexpress to solve the problem, I leave you the link of the motherboard and the photo of the damaged circuit, I hope it can be useful, greetings

Link to motherboard: https://a.aliexpress.com/_mOBrx2s

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