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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, proposed preliminary tries (if have not been done):
In most variants of this model, it would be at the main board/module N7EJ (1AA4B10N22900_A) location IC5750.
Alternatively, there are shops accepting repairs of these boards. Please click HERE.
I understand and the above was just an option where to send in the main board for diagnosis/repairs (not the entire unit).