LG 60PK540 and 60PK550 comparisons
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The LG 60PK540 is almost identical to the LG 60PK550. The only difference is that the 60PK550 has an extra USB 2.0 port. With the USB input you can share your home videos or photos on the big screen or listen to your favorite music. Simply connect your digital camera, USB-enabled MP3 player, or USB storage device directly to your HDTV’s USB input.
Other that that, the two sets are the same. You can often spot a great deal on the 60PK540.
By the same token, the LG 50PK550 also has an extra USB port than the 50PK540.