LG 40LX560H Service Manual page 18

3. Analog RF Video Trouble Shooting guide
Check RF cable & signal
YES
Check TU3001 Pin7(Video output)
Can you see the normal signal?
YES
Check tuner 5V power L3000
YES
Check tuner 3.3V power L3001
Check tuner 1.8V power L3003
YES
Check Mstar LVDS output
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Only for training and service purposes
NO
Could you measure voltage of TU3001 & IIC lines?
Are they all normal?
You should replace TUNER.
NO
Check IC5000
YES
NO
Replace L3001
NO
Replace IC3000 or IC3000
NO
Replace Mstar(IC101)
or main board
YES
NO
Replace IC5000
Replace L3000
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NO
You should check power line
& IIC lines.
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