Here,abtay.com is a samsung tv parts online store ,and include ORIGINAL SAMSUNG BN44-00428A POWER SUPPLY / LED BOARD FOR UN55D7000LFXZA
https://www.abctay.com/original-samsung-bn4400428a-power-supply-led-board-for-un55d7000lfxza-p-3212.html
Since you are using the COMCAST REMOTE, does it mean that you are using the COMCAST CABLE BOX which gets the signals from the cable and its output is fed into your TV channel 3?
Please clarify your setup.
U able to go into the tv Menu?Yes,goto SETUP changes Pick CABLE and scan for channels for the Comcast CABLE channels.Or Try website like Remotes.com to buy an original tv remote.
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