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42LT777H (CHASSIS:LA2FZ) - LG TV Service Manual (repair manual). Page 21

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Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU8900 Pin5
(Video output)
Y
Check tuner 5V power R8953
Y
Check tuner 3.3V power L8904
Y
Check tuner 1.8V power IC8900
2pin : 1.8V
Y
Check MTK LVDS output
Replace Tuner.
N
Check IC2404
Replace L8904
Replace IC8900
N
N
N
Replace IC105
N
Replace IC2404
N
Y
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