LG 42LN541C Service Manual page 19

10. RJP (only us model)
Check RJP RJ45 Cable & HDMI cable
ok
Check RJP Power 12V
L901, JK901 1pin
ok
Check RJP Control Signal for input mode
R911, R909, R910, R912, R913
High level : above 3V
ok
Check RJ45 Jack(JK901)
ok
Check RJP
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Only for training and service purposes
No
Replace L901, JK901 1pin
No
Replace R911, R909, R910, R912, R913
No
Replace connector
if found to be damaged.
No
Replace RJP.
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LGE Internal Use Only