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Call Pickup doesn't ring your phone or light up. Your 5212 phone isn't considered a "display phone" Meaning that the display doesn't have softkeys. These are the 3 keys directly below the display and their function changes as you are using the phone.
Your phone's Pickup Key should be used if you want to pick up a call that is ringing on a nearby telephone... usually only the phones within earshot of your phone.
You must pick up the handset, then either press the call pickup key or dial the call pickup feature code.... this code can be different for every system as it's custom from the install vendor.
the power supply board is failing and needs replacing.replacing board is the easiest thing to do, lay tv down on a soft blanket(screen down), remove back cover and you will see the board. 4 screws and a couple of connectors and it is done. call 1-800-samsung to find the closest service/parts center to order board.