If you press the menu button of the sets own remote control does the menu come up please?
Its a bad main-board, let me tell you that to replace the aminboard could cost in excess of $80+ so $80_$150 these small sets now can be picked up for under $200 so there is economics in doing this, if you do want to go ahead (some people do for sentimental reasons for the set) I will be happy to help however ordinarily its a better option to just replace it.
Let me know if you need more help
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Thanks for the rating