Sounds like main power regulator board fault. There is no such reset button [external] to modern TV. You should have to enter its service mode option to reset it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
SOURCE: Apex TV AT2002 has sound and no picture.
i am not familiar with your tv but i can say that there is a micro that control most functin of your tv,have a tech check your tv for repair
SOURCE: apex gt 2715 turns on but no picture or sound
Its main digital board should be suspected. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock! Instead, contact any experienced service technician, or the nearest service center.
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