Read LG 42LT560C / 42LT560E (CHASSIS:LA2AC) Service Manual online
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12. RJP (except 22/26LT560C-UA)
Check RJP RJ45 Cable & HDMI cable
Check RJP Power 12V
L1800, JK1800 1pin
Replace L1800 or Q1800
Check RJP Control Signal for input mode
R1806, 1804, 1805, 1807, 1804
High level : above 3V
Replace I R1806, 1804, 1805, 1807, 1804
ok
ok
ok
No
No
Check RJ45 Jack(JK1800)
Replace connector
if found to be damaged.
No
ok
Check RJP
Replace RJP.
No
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