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Requesting how to enter service menu on RCA smart tv SLD65A55RQ

Requesting how to enter service menu on RCA smart tv SLD65A55RQ. Have tried the menu 1147 and a few others. I did buy a universal remote from Amazon and it works but cant get into the service menu to change the bit on it after installing a new main board.

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@vadertaz tried SOURCE (may also be INPUT on your remote)-2 - 5 - 8 - 0

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Thanks for your response i did try that one too.

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