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Hi and welcome,Thank you for the question and your patience. Should you still need assistance for information purposes only... Initially, the described symptom almost always point to a faulty A board and/or the P board. After a review of the repair / Service Manual, possible suspects are low or missing:
As such, are you then considering a DIY (do-it-yourself) repair approach? If yes, pre-requisite would be access to and familiarity with a multimeter and even perhaps a soldering iron/hot-air station.
Please post back how you would want to approach this and/or should additional information be needed.