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Yes, I guess you are at the point where going to QSC official service is the only option.  I don't know if they do component level repairs, or if they only do board swaps.  Since QSC seems to be out of stock of just about everything electronic (definitely the TM replacement main boards, I asked because I nearly gave up on this one, and many of the powered speaker boards), you might want to call & ask them about exactly how they repair Touchmix devices in your country. If they do component level repairs, then you should be fine. If they only do board swaps (like Apple), then you could be in for a long wait (they are suffering from severe supply chain issues like many other companies that build electronic devices).