RCA J42H750...plug in / blue light steady / flashes approx 15x / steady again. Back cover off and screen is backlit or energized.  Can not get any function to operate or show on screen. Menu/volume/channel/ nothing. No burned or expanded caps visible, no appearent burns, or heat type damage to three visible boards. I do not have master remote. A point in the right direction would be greatly appreciated.
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