Read LG 42LT670H (CHASSIS:LA2AF) Service Manual online
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Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU3001 Pin7
(Video output)
Y
Check tuner 5V power L3000
Y
Check tuner 3.3V power L3001
Y
Check tuner 1.8V power IC3000
2pin : 1.8V
Y
Check Mstar LVDS output
Replace Tuner.
N
Check IC5000
Replace L3001
Replace IC3000
N
N
N
Replace IC101
N
Replace IC5000
N
Y
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