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I recall reading elsewhere on this forum that LXI gear was made by Sanyo. I have a 10" Philips branded AC/DC set that was made by Sanyo which also has a 5 pin power connector with 3 pins on the DC side.
On that set the middle pin is +12V, the pin next to hot AC pin is GND and the remaining pin is jumpered to the neutral AC pin to enable DC operation.
On your set pinout may well be different, so open it up and trace the connections before hooking it up (the DC side of these sets is usually wired so that if you reverse the polarity the fuse will blow, but why risk killing your set), but it probably uses a similar arrangement where the 3rd DC pin has to be jumpered to another pin to enable DC operation.
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