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First check the power supply / adaptor to ensure this is working correctly. Measure the voltage using a multimeter - if this is correct move on ( if not replace power supply )
Does the keyboard work if you hold the plug in the socket or move it slightly ? If so this is a common problem as the power socket on the pcb fails at the solder joint and will need to be repaired / replaced.
If this appears to be solid then you may have done some internal damage by either plugging in a power adaptor with a too high voltage or wrong polarity. If this is the case you may have blown some circuitry inside which controls voltage regulation.
The original power supply is no longer available but you can get a replacment at Geeks.compart # 60w-12. You will have to change the plug that goes into the tv. The original plug has 2 wires. White(+) and Black(-). Be sure to observe polarity.