LG 42LH20 Service Manual page 53

Main PWB LD1000 Function
Main PWB LD1000 Function
LD1000
Use LD1000 as a visual aid.
This lets you know if the tuner internal PLL
(Phase Locked Loop) system is locked.
Illuminated PLL is normal.
Off is abnormal tuner lock.
Main PWB
LD1000 Location
MAIN PWB
February 2009 42LH20
53