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Hi, Model Number off of the back of the TV please??
Where did you purchase the power board from?
Also, when you press power, does your screen ever actually light up?
DVD and cable box are not relative here to the TV's screen lighting up. You're saying you never get the Hitachi logo on the screen right?
This is caused by a faulty Mainboard, Sustain Boards or Drivers. What is your level of electronics troubleshooting and TV repair please?
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